mediaapi: Add thumbnail support (#132)

* vendor: Add bimg image processing library

bimg is MIT licensed. It depends on the C library libvips which is LGPL
v2.1+ licensed. libvips must be installed separately.

* mediaapi: Add YAML config file support

* mediaapi: Add thumbnail support

* mediaapi: Add missing thumbnail files

* travis: Add ppa and install libvips-dev

* travis: Another ppa and install libvips-dev attempt

* travis: Add sudo: required for sudo apt* usage

* mediaapi/thumbnailer: Make comparison code more readable

* mediaapi: Simplify logging of thumbnail properties

* mediaapi/thumbnailer: Rename metrics to fitness

Metrics is used in the context of monitoring with Prometheus so renaming
to avoid confusion.

* mediaapi/thumbnailer: Use math.Inf() for max aspect and size

* mediaapi/thumbnailer: Limit number of parallel generators

Fall back to selecting from already-/pre-generated thumbnails or serving
the original.

* mediaapi/thumbnailer: Split bimg code into separate file

* vendor: Add github.com/nfnt/resize pure go image scaler

* mediaapi/thumbnailer: Add nfnt/resize thumbnailer

* travis: Don't install libvips-dev via ppa

* mediaapi: Add notes to README about resizers

* mediaapi: Elaborate on scaling libs in README

media-api-server-config.yaml

@@ -0,0 +1,38 @@
+# The name of the server. This is usually the domain name, e.g 'matrix.org', 'localhost'.
+server_name: "example.com"
+
+# The base path to where the media files will be stored. May be relative or absolute.
+base_path: /var/dendrite/media
+
+# The maximum file size in bytes that is allowed to be stored on this server.
+# Note: if max_file_size_bytes is set to 0, the size is unlimited.
+# Note: if max_file_size_bytes is not set, it will default to 10485760 (10MB)
+max_file_size_bytes: 10485760
+
+# The postgres connection config for connecting to the database e.g a postgres:// URI
+database: "postgres://dendrite:itsasecret@localhost/mediaapi?sslmode=disable"
+
+# Whether to dynamically generate thumbnails on-the-fly if the requested resolution is not already generated
+# NOTE: This is a possible denial-of-service attack vector - use at your own risk
+dynamic_thumbnails: false
+
+# A list of thumbnail sizes to be pre-generated for downloaded remote / uploaded content
+# method is one of crop or scale. If omitted, it will default to scale.
+# crop scales to fill the requested dimensions and crops the excess.
+# scale scales to fit the requested dimensions and one dimension may be smaller than requested.
+thumbnail_sizes:
+- width: 32
+  height: 32
+  method: crop
+- width: 96
+  height: 96
+  method: crop
+- width: 320
+  height: 240
+  method: scale
+- width: 640
+  height: 480
+  method: scale
+- width: 800
+  height: 600
+  method: scale

src/github.com/matrix-org/dendrite/cmd/dendrite-media-api-server/main.go

@@ -15,10 +15,14 @@
 package main
 
 import (
+	"fmt"
+	"io/ioutil"
 	"net/http"
 	"os"
+	"os/user"
 	"path/filepath"
 	"strconv"
+	"strings"
 
 	"github.com/matrix-org/dendrite/common"
 	"github.com/matrix-org/dendrite/mediaapi/config"
@@ -28,6 +32,7 @@ import (
 	"github.com/matrix-org/gomatrixserverlib"
 
 	log "github.com/Sirupsen/logrus"
+	yaml "gopkg.in/yaml.v2"
 )
 
 var (
@@ -38,36 +43,25 @@ var (
 	basePath   = os.Getenv("BASE_PATH")
 	// Note: if the MAX_FILE_SIZE_BYTES is set to 0, it will be unlimited
 	maxFileSizeBytesString = os.Getenv("MAX_FILE_SIZE_BYTES")
+	configPath             = os.Getenv("CONFIG_PATH")
 )
 
 func main() {
 	common.SetupLogging(logDir)
 
-	if bindAddr == "" {
-		log.Panic("No BIND_ADDRESS environment variable found.")
-	}
-	if basePath == "" {
-		log.Panic("No BASE_PATH environment variable found.")
-	}
-	absBasePath, err := filepath.Abs(basePath)
-	if err != nil {
-		log.WithError(err).WithField("BASE_PATH", basePath).Panic("BASE_PATH is invalid (must be able to make absolute)")
-	}
+	log.WithFields(log.Fields{
+		"BIND_ADDRESS":        bindAddr,
+		"DATABASE":            dataSource,
+		"LOG_DIR":             logDir,
+		"SERVER_NAME":         serverName,
+		"BASE_PATH":           basePath,
+		"MAX_FILE_SIZE_BYTES": maxFileSizeBytesString,
+		"CONFIG_PATH":         configPath,
+	}).Info("Loading configuration based on config file and environment variables")
 
-	if serverName == "" {
-		serverName = "localhost"
-	}
-	maxFileSizeBytes, err := strconv.ParseInt(maxFileSizeBytesString, 10, 64)
+	cfg, err := configureServer()
 	if err != nil {
-		maxFileSizeBytes = 10 * 1024 * 1024
-		log.WithError(err).WithField("MAX_FILE_SIZE_BYTES", maxFileSizeBytesString).Warnf("Failed to parse MAX_FILE_SIZE_BYTES. Defaulting to %v bytes.", maxFileSizeBytes)
-	}
-
-	cfg := &config.MediaAPI{
-		ServerName:       gomatrixserverlib.ServerName(serverName),
-		AbsBasePath:      types.Path(absBasePath),
-		MaxFileSizeBytes: types.FileSizeBytes(maxFileSizeBytes),
-		DataSource:       dataSource,
+		log.WithError(err).Fatal("Invalid configuration")
 	}
 
 	db, err := storage.Open(cfg.DataSource)
@@ -76,14 +70,182 @@ func main() {
 	}
 
 	log.WithFields(log.Fields{
-		"BASE_PATH":           absBasePath,
-		"BIND_ADDRESS":        bindAddr,
-		"DATABASE":            dataSource,
-		"LOG_DIR":             logDir,
-		"MAX_FILE_SIZE_BYTES": maxFileSizeBytes,
-		"SERVER_NAME":         serverName,
-	}).Info("Starting mediaapi")
+		"BIND_ADDRESS":           bindAddr,
+		"LOG_DIR":                logDir,
+		"CONFIG_PATH":            configPath,
+		"ServerName":             cfg.ServerName,
+		"AbsBasePath":            cfg.AbsBasePath,
+		"MaxFileSizeBytes":       *cfg.MaxFileSizeBytes,
+		"DataSource":             cfg.DataSource,
+		"DynamicThumbnails":      cfg.DynamicThumbnails,
+		"MaxThumbnailGenerators": cfg.MaxThumbnailGenerators,
+		"ThumbnailSizes":         cfg.ThumbnailSizes,
+	}).Info("Starting mediaapi server with configuration")
 
 	routing.Setup(http.DefaultServeMux, http.DefaultClient, cfg, db)
 	log.Fatal(http.ListenAndServe(bindAddr, nil))
 }
+
+// configureServer loads configuration from a yaml file and overrides with environment variables
+func configureServer() (*config.MediaAPI, error) {
+	cfg, err := loadConfig(configPath)
+	if err != nil {
+		log.WithError(err).Fatal("Invalid config file")
+	}
+
+	// override values from environment variables
+	applyOverrides(cfg)
+
+	if err := validateConfig(cfg); err != nil {
+		return nil, err
+	}
+
+	return cfg, nil
+}
+
+// FIXME: make common somehow? copied from sync api
+func loadConfig(configPath string) (*config.MediaAPI, error) {
+	contents, err := ioutil.ReadFile(configPath)
+	if err != nil {
+		return nil, err
+	}
+	var cfg config.MediaAPI
+	if err = yaml.Unmarshal(contents, &cfg); err != nil {
+		return nil, err
+	}
+	return &cfg, nil
+}
+
+func applyOverrides(cfg *config.MediaAPI) {
+	if serverName != "" {
+		if cfg.ServerName != "" {
+			log.WithFields(log.Fields{
+				"server_name": cfg.ServerName,
+				"SERVER_NAME": serverName,
+			}).Info("Overriding server_name from config file with environment variable")
+		}
+		cfg.ServerName = gomatrixserverlib.ServerName(serverName)
+	}
+	if cfg.ServerName == "" {
+		log.Info("ServerName not set. Defaulting to 'localhost'.")
+		cfg.ServerName = "localhost"
+	}
+
+	if basePath != "" {
+		if cfg.BasePath != "" {
+			log.WithFields(log.Fields{
+				"base_path": cfg.BasePath,
+				"BASE_PATH": basePath,
+			}).Info("Overriding base_path from config file with environment variable")
+		}
+		cfg.BasePath = types.Path(basePath)
+	}
+
+	if maxFileSizeBytesString != "" {
+		if cfg.MaxFileSizeBytes != nil {
+			log.WithFields(log.Fields{
+				"max_file_size_bytes": *cfg.MaxFileSizeBytes,
+				"MAX_FILE_SIZE_BYTES": maxFileSizeBytesString,
+			}).Info("Overriding max_file_size_bytes from config file with environment variable")
+		}
+		maxFileSizeBytesInt, err := strconv.ParseInt(maxFileSizeBytesString, 10, 64)
+		if err != nil {
+			maxFileSizeBytesInt = 10 * 1024 * 1024
+			log.WithError(err).WithField(
+				"MAX_FILE_SIZE_BYTES", maxFileSizeBytesString,
+			).Infof("MAX_FILE_SIZE_BYTES not set? Defaulting to %v bytes.", maxFileSizeBytesInt)
+		}
+		maxFileSizeBytes := types.FileSizeBytes(maxFileSizeBytesInt)
+		cfg.MaxFileSizeBytes = &maxFileSizeBytes
+	}
+
+	if dataSource != "" {
+		if cfg.DataSource != "" {
+			log.WithFields(log.Fields{
+				"database": cfg.DataSource,
+				"DATABASE": dataSource,
+			}).Info("Overriding database from config file with environment variable")
+		}
+		cfg.DataSource = dataSource
+	}
+
+	if cfg.MaxThumbnailGenerators == 0 {
+		log.WithField(
+			"max_thumbnail_generators", cfg.MaxThumbnailGenerators,
+		).Info("Using default max_thumbnail_generators")
+		cfg.MaxThumbnailGenerators = 10
+	}
+}
+
+func validateConfig(cfg *config.MediaAPI) error {
+	if bindAddr == "" {
+		return fmt.Errorf("no BIND_ADDRESS environment variable found")
+	}
+
+	absBasePath, err := getAbsolutePath(cfg.BasePath)
+	if err != nil {
+		return fmt.Errorf("invalid base path (%v): %q", cfg.BasePath, err)
+	}
+	cfg.AbsBasePath = types.Path(absBasePath)
+
+	if *cfg.MaxFileSizeBytes < 0 {
+		return fmt.Errorf("invalid max file size bytes (%v)", *cfg.MaxFileSizeBytes)
+	}
+
+	if cfg.DataSource == "" {
+		return fmt.Errorf("invalid database (%v)", cfg.DataSource)
+	}
+
+	for _, config := range cfg.ThumbnailSizes {
+		if config.Width <= 0 || config.Height <= 0 {
+			return fmt.Errorf("invalid thumbnail size %vx%v", config.Width, config.Height)
+		}
+	}
+
+	return nil
+}
+
+func getAbsolutePath(basePath types.Path) (types.Path, error) {
+	var err error
+	if basePath == "" {
+		var wd string
+		wd, err = os.Getwd()
+		return types.Path(wd), err
+	}
+	// Note: If we got here len(basePath) >= 1
+	if basePath[0] == '~' {
+		basePath, err = expandHomeDir(basePath)
+		if err != nil {
+			return "", err
+		}
+	}
+	absBasePath, err := filepath.Abs(string(basePath))
+	return types.Path(absBasePath), err
+}
+
+// expandHomeDir parses paths beginning with ~/path or ~user/path and replaces the home directory part
+func expandHomeDir(basePath types.Path) (types.Path, error) {
+	slash := strings.Index(string(basePath), "/")
+	if slash == -1 {
+		// pretend the slash is after the path as none was found within the string
+		// simplifies code using slash below
+		slash = len(basePath)
+	}
+	var usr *user.User
+	var err error
+	if slash == 1 {
+		// basePath is ~ or ~/path
+		usr, err = user.Current()
+		if err != nil {
+			return "", fmt.Errorf("failed to get user's home directory: %q", err)
+		}
+	} else {
+		// slash > 1
+		// basePath is ~user or ~user/path
+		usr, err = user.Lookup(string(basePath[1:slash]))
+		if err != nil {
+			return "", fmt.Errorf("failed to get user's home directory: %q", err)
+		}
+	}
+	return types.Path(filepath.Join(usr.HomeDir, string(basePath[slash:]))), nil
+}

src/github.com/matrix-org/dendrite/mediaapi/README.md

@@ -0,0 +1,27 @@
+# Media API
+
+This server is responsible for serving `/media` requests as per:
+
+http://matrix.org/docs/spec/client_server/r0.2.0.html#id43
+
+## Scaling libraries
+
+### nfnt/resize (default)
+
+Thumbnailing uses https://github.com/nfnt/resize by default which is a pure golang image scaling library relying on image codecs from the standard library. It is ISC-licensed.
+
+It is multi-threaded and uses Lanczos3 so produces sharp images. Using Lanczos3 all the way makes it slower than some other approaches like bimg. (~845ms in total for pre-generating 32x32-crop, 96x96-crop, 320x240-scale, 640x480-scale and 800x600-scale from a given JPEG image on a given machine.)
+
+See the sample below for image quality with nfnt/resize:
+
+![](nfnt-96x96-crop.jpg)
+
+### bimg (uses libvips C library)
+
+Alternatively one can use `gb build -tags bimg` to use bimg from https://github.com/h2non/bimg (MIT-licensed) which uses libvips from https://github.com/jcupitt/libvips (LGPL v2.1+ -licensed). libvips is a C library and must be installed/built separately. See the github page for details. Also note that libvips in turn has dependencies with a selection of FOSS licenses.
+
+bimg and libvips have significantly better performance than nfnt/resize but produce slightly less-sharp images. bimg uses a box filter for downscaling to within about 200% of the target scale and then uses Lanczos3 for the last bit. This is a much faster approach but comes at the expense of sharpness. (~295ms in total for pre-generating 32x32-crop, 96x96-crop, 320x240-scale, 640x480-scale and 800x600-scale from a given JPEG image on a given machine.)
+
+See the sample below for image quality with bimg:
+
+![](bimg-96x96-crop.jpg)

src/github.com/matrix-org/dendrite/mediaapi/config/config.go

@@ -23,12 +23,20 @@ import (
 type MediaAPI struct {
 	// The name of the server. This is usually the domain name, e.g 'matrix.org', 'localhost'.
 	ServerName gomatrixserverlib.ServerName `yaml:"server_name"`
+	// The base path to where the media files will be stored. May be relative or absolute.
+	BasePath types.Path `yaml:"base_path"`
 	// The absolute base path to where media files will be stored.
-	AbsBasePath types.Path `yaml:"abs_base_path"`
+	AbsBasePath types.Path `yaml:"-"`
 	// The maximum file size in bytes that is allowed to be stored on this server.
 	// Note: if MaxFileSizeBytes is set to 0, the size is unlimited.
 	// Note: if max_file_size_bytes is not set, it will default to 10485760 (10MB)
-	MaxFileSizeBytes types.FileSizeBytes `yaml:"max_file_size_bytes"`
+	MaxFileSizeBytes *types.FileSizeBytes `yaml:"max_file_size_bytes,omitempty"`
 	// The postgres connection config for connecting to the database e.g a postgres:// URI
 	DataSource string `yaml:"database"`
+	// Whether to dynamically generate thumbnails on-the-fly if the requested resolution is not already generated
+	DynamicThumbnails bool `yaml:"dynamic_thumbnails"`
+	// The maximum number of simultaneous thumbnail generators. default: 10
+	MaxThumbnailGenerators int `yaml:"max_thumbnail_generators"`
+	// A list of thumbnail sizes to be pre-generated for downloaded remote / uploaded content
+	ThumbnailSizes []types.ThumbnailSize `yaml:"thumbnail_sizes"`
 }

src/github.com/matrix-org/dendrite/mediaapi/routing/routing.go

@@ -35,28 +35,40 @@ const pathPrefixR0 = "/_matrix/media/v1"
 func Setup(servMux *http.ServeMux, httpClient *http.Client, cfg *config.MediaAPI, db *storage.Database) {
 	apiMux := mux.NewRouter()
 	r0mux := apiMux.PathPrefix(pathPrefixR0).Subrouter()
+
+	activeThumbnailGeneration := &types.ActiveThumbnailGeneration{
+		PathToResult: map[string]*types.ThumbnailGenerationResult{},
+	}
+
 	// FIXME: /upload should use common.MakeAuthAPI()
 	r0mux.Handle("/upload", common.MakeAPI("upload", func(req *http.Request) util.JSONResponse {
-		return writers.Upload(req, cfg, db)
+		return writers.Upload(req, cfg, db, activeThumbnailGeneration)
 	}))
 
 	activeRemoteRequests := &types.ActiveRemoteRequests{
 		MXCToResult: map[string]*types.RemoteRequestResult{},
 	}
 	r0mux.Handle("/download/{serverName}/{mediaId}",
-		prometheus.InstrumentHandler("download", http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
-			req = util.RequestWithLogging(req)
-
-			// Set common headers returned regardless of the outcome of the request
-			util.SetCORSHeaders(w)
-			// Content-Type will be overridden in case of returning file data, else we respond with JSON-formatted errors
-			w.Header().Set("Content-Type", "application/json")
-
-			vars := mux.Vars(req)
-			writers.Download(w, req, gomatrixserverlib.ServerName(vars["serverName"]), types.MediaID(vars["mediaId"]), cfg, db, activeRemoteRequests)
-		})),
+		makeDownloadAPI("download", cfg, db, activeRemoteRequests, activeThumbnailGeneration),
+	)
+	r0mux.Handle("/thumbnail/{serverName}/{mediaId}",
+		makeDownloadAPI("thumbnail", cfg, db, activeRemoteRequests, activeThumbnailGeneration),
 	)
 
 	servMux.Handle("/metrics", prometheus.Handler())
 	servMux.Handle("/api/", http.StripPrefix("/api", apiMux))
 }
+
+func makeDownloadAPI(name string, cfg *config.MediaAPI, db *storage.Database, activeRemoteRequests *types.ActiveRemoteRequests, activeThumbnailGeneration *types.ActiveThumbnailGeneration) http.HandlerFunc {
+	return prometheus.InstrumentHandler(name, http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
+		req = util.RequestWithLogging(req)
+
+		// Set common headers returned regardless of the outcome of the request
+		util.SetCORSHeaders(w)
+		// Content-Type will be overridden in case of returning file data, else we respond with JSON-formatted errors
+		w.Header().Set("Content-Type", "application/json")
+
+		vars := mux.Vars(req)
+		writers.Download(w, req, gomatrixserverlib.ServerName(vars["serverName"]), types.MediaID(vars["mediaId"]), cfg, db, activeRemoteRequests, activeThumbnailGeneration, name == "thumbnail")
+	}))
+}

src/github.com/matrix-org/dendrite/mediaapi/storage/sql.go

@@ -19,13 +19,17 @@ import (
 )
 
 type statements struct {
-	mediaStatements
+	media     mediaStatements
+	thumbnail thumbnailStatements
 }
 
 func (s *statements) prepare(db *sql.DB) error {
 	var err error
 
-	if err = s.mediaStatements.prepare(db); err != nil {
+	if err = s.media.prepare(db); err != nil {
+		return err
+	}
+	if err = s.thumbnail.prepare(db); err != nil {
 		return err
 	}
 

src/github.com/matrix-org/dendrite/mediaapi/storage/storage.go

@@ -45,16 +45,44 @@ func Open(dataSourceName string) (*Database, error) {
 // StoreMediaMetadata inserts the metadata about the uploaded media into the database.
 // Returns an error if the combination of MediaID and Origin are not unique in the table.
 func (d *Database) StoreMediaMetadata(mediaMetadata *types.MediaMetadata) error {
-	return d.statements.insertMedia(mediaMetadata)
+	return d.statements.media.insertMedia(mediaMetadata)
 }
 
 // GetMediaMetadata returns metadata about media stored on this server.
 // The media could have been uploaded to this server or fetched from another server and cached here.
 // Returns nil metadata if there is no metadata associated with this media.
 func (d *Database) GetMediaMetadata(mediaID types.MediaID, mediaOrigin gomatrixserverlib.ServerName) (*types.MediaMetadata, error) {
-	mediaMetadata, err := d.statements.selectMedia(mediaID, mediaOrigin)
+	mediaMetadata, err := d.statements.media.selectMedia(mediaID, mediaOrigin)
 	if err != nil && err == sql.ErrNoRows {
 		return nil, nil
 	}
 	return mediaMetadata, err
 }
+
+// StoreThumbnail inserts the metadata about the thumbnail into the database.
+// Returns an error if the combination of MediaID and Origin are not unique in the table.
+func (d *Database) StoreThumbnail(thumbnailMetadata *types.ThumbnailMetadata) error {
+	return d.statements.thumbnail.insertThumbnail(thumbnailMetadata)
+}
+
+// GetThumbnail returns metadata about a specific thumbnail.
+// The media could have been uploaded to this server or fetched from another server and cached here.
+// Returns nil metadata if there is no metadata associated with this thumbnail.
+func (d *Database) GetThumbnail(mediaID types.MediaID, mediaOrigin gomatrixserverlib.ServerName, width, height int, resizeMethod string) (*types.ThumbnailMetadata, error) {
+	thumbnailMetadata, err := d.statements.thumbnail.selectThumbnail(mediaID, mediaOrigin, width, height, resizeMethod)
+	if err != nil && err == sql.ErrNoRows {
+		return nil, nil
+	}
+	return thumbnailMetadata, err
+}
+
+// GetThumbnails returns metadata about all thumbnails for a specific media stored on this server.
+// The media could have been uploaded to this server or fetched from another server and cached here.
+// Returns nil metadata if there are no thumbnails associated with this media.
+func (d *Database) GetThumbnails(mediaID types.MediaID, mediaOrigin gomatrixserverlib.ServerName) ([]*types.ThumbnailMetadata, error) {
+	thumbnails, err := d.statements.thumbnail.selectThumbnails(mediaID, mediaOrigin)
+	if err != nil && err == sql.ErrNoRows {
+		return nil, nil
+	}
+	return thumbnails, err
+}

src/github.com/matrix-org/dendrite/mediaapi/storage/thumbnail_table.go

@@ -0,0 +1,157 @@
+// Copyright 2017 Vector Creations Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package storage
+
+import (
+	"database/sql"
+	"time"
+
+	"github.com/matrix-org/dendrite/mediaapi/types"
+	"github.com/matrix-org/gomatrixserverlib"
+)
+
+const thumbnailSchema = `
+-- The thumbnail table holds metadata for each thumbnail file stored and accessible to the local server,
+-- the actual file is stored separately.
+CREATE TABLE IF NOT EXISTS thumbnail (
+    -- The id used to refer to the media.
+    -- For uploads to this server this is a base64-encoded sha256 hash of the file data
+    -- For media from remote servers, this can be any unique identifier string
+    media_id TEXT NOT NULL,
+    -- The origin of the media as requested by the client. Should be a homeserver domain.
+    media_origin TEXT NOT NULL,
+    -- The MIME-type of the thumbnail file.
+    content_type TEXT NOT NULL,
+    -- Size of the thumbnail file in bytes.
+    file_size_bytes BIGINT NOT NULL,
+    -- When the thumbnail was generated in UNIX epoch ms.
+    creation_ts BIGINT NOT NULL,
+    -- The width of the thumbnail
+    width INTEGER NOT NULL,
+    -- The height of the thumbnail
+    height INTEGER NOT NULL,
+    -- The resize method used to generate the thumbnail. Can be crop or scale.
+    resize_method TEXT NOT NULL
+);
+CREATE UNIQUE INDEX IF NOT EXISTS thumbnail_index ON thumbnail (media_id, media_origin, width, height, resize_method);
+`
+
+const insertThumbnailSQL = `
+INSERT INTO thumbnail (media_id, media_origin, content_type, file_size_bytes, creation_ts, width, height, resize_method)
+    VALUES ($1, $2, $3, $4, $5, $6, $7, $8)
+`
+
+// Note: this selects one specific thumbnail
+const selectThumbnailSQL = `
+SELECT content_type, file_size_bytes, creation_ts FROM thumbnail WHERE media_id = $1 AND media_origin = $2 AND width = $3 AND height = $4 AND resize_method = $5
+`
+
+// Note: this selects all thumbnails for a media_origin and media_id
+const selectThumbnailsSQL = `
+SELECT content_type, file_size_bytes, creation_ts, width, height, resize_method FROM thumbnail WHERE media_id = $1 AND media_origin = $2
+`
+
+type thumbnailStatements struct {
+	insertThumbnailStmt  *sql.Stmt
+	selectThumbnailStmt  *sql.Stmt
+	selectThumbnailsStmt *sql.Stmt
+}
+
+func (s *thumbnailStatements) prepare(db *sql.DB) (err error) {
+	_, err = db.Exec(thumbnailSchema)
+	if err != nil {
+		return
+	}
+
+	return statementList{
+		{&s.insertThumbnailStmt, insertThumbnailSQL},
+		{&s.selectThumbnailStmt, selectThumbnailSQL},
+		{&s.selectThumbnailsStmt, selectThumbnailsSQL},
+	}.prepare(db)
+}
+
+func (s *thumbnailStatements) insertThumbnail(thumbnailMetadata *types.ThumbnailMetadata) error {
+	thumbnailMetadata.MediaMetadata.CreationTimestamp = types.UnixMs(time.Now().UnixNano() / 1000000)
+	_, err := s.insertThumbnailStmt.Exec(
+		thumbnailMetadata.MediaMetadata.MediaID,
+		thumbnailMetadata.MediaMetadata.Origin,
+		thumbnailMetadata.MediaMetadata.ContentType,
+		thumbnailMetadata.MediaMetadata.FileSizeBytes,
+		thumbnailMetadata.MediaMetadata.CreationTimestamp,
+		thumbnailMetadata.ThumbnailSize.Width,
+		thumbnailMetadata.ThumbnailSize.Height,
+		thumbnailMetadata.ThumbnailSize.ResizeMethod,
+	)
+	return err
+}
+
+func (s *thumbnailStatements) selectThumbnail(mediaID types.MediaID, mediaOrigin gomatrixserverlib.ServerName, width, height int, resizeMethod string) (*types.ThumbnailMetadata, error) {
+	thumbnailMetadata := types.ThumbnailMetadata{
+		MediaMetadata: &types.MediaMetadata{
+			MediaID: mediaID,
+			Origin:  mediaOrigin,
+		},
+		ThumbnailSize: types.ThumbnailSize{
+			Width:        width,
+			Height:       height,
+			ResizeMethod: resizeMethod,
+		},
+	}
+	err := s.selectThumbnailStmt.QueryRow(
+		thumbnailMetadata.MediaMetadata.MediaID,
+		thumbnailMetadata.MediaMetadata.Origin,
+		thumbnailMetadata.ThumbnailSize.Width,
+		thumbnailMetadata.ThumbnailSize.Height,
+		thumbnailMetadata.ThumbnailSize.ResizeMethod,
+	).Scan(
+		&thumbnailMetadata.MediaMetadata.ContentType,
+		&thumbnailMetadata.MediaMetadata.FileSizeBytes,
+		&thumbnailMetadata.MediaMetadata.CreationTimestamp,
+	)
+	return &thumbnailMetadata, err
+}
+
+func (s *thumbnailStatements) selectThumbnails(mediaID types.MediaID, mediaOrigin gomatrixserverlib.ServerName) ([]*types.ThumbnailMetadata, error) {
+	rows, err := s.selectThumbnailsStmt.Query(
+		mediaID, mediaOrigin,
+	)
+	if err != nil {
+		return nil, err
+	}
+
+	var thumbnails []*types.ThumbnailMetadata
+	for rows.Next() {
+		thumbnailMetadata := types.ThumbnailMetadata{
+			MediaMetadata: &types.MediaMetadata{
+				MediaID: mediaID,
+				Origin:  mediaOrigin,
+			},
+		}
+		err = rows.Scan(
+			&thumbnailMetadata.MediaMetadata.ContentType,
+			&thumbnailMetadata.MediaMetadata.FileSizeBytes,
+			&thumbnailMetadata.MediaMetadata.CreationTimestamp,
+			&thumbnailMetadata.ThumbnailSize.Width,
+			&thumbnailMetadata.ThumbnailSize.Height,
+			&thumbnailMetadata.ThumbnailSize.ResizeMethod,
+		)
+		if err != nil {
+			return nil, err
+		}
+		thumbnails = append(thumbnails, &thumbnailMetadata)
+	}
+
+	return thumbnails, err
+}

src/github.com/matrix-org/dendrite/mediaapi/thumbnailer/thumbnailer.go

@@ -0,0 +1,221 @@
+// Copyright 2017 Vector Creations Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package thumbnailer
+
+import (
+	"fmt"
+	"math"
+	"path/filepath"
+	"sync"
+
+	log "github.com/Sirupsen/logrus"
+	"github.com/matrix-org/dendrite/mediaapi/types"
+)
+
+type thumbnailFitness struct {
+	isSmaller      int
+	aspect         float64
+	size           float64
+	methodMismatch int
+	fileSize       types.FileSizeBytes
+}
+
+// thumbnailTemplate is the filename template for thumbnails
+const thumbnailTemplate = "thumbnail-%vx%v-%v"
+
+// GetThumbnailPath returns the path to a thumbnail given the absolute src path and thumbnail size configuration
+func GetThumbnailPath(src types.Path, config types.ThumbnailSize) types.Path {
+	srcDir := filepath.Dir(string(src))
+	return types.Path(filepath.Join(
+		srcDir,
+		fmt.Sprintf(thumbnailTemplate, config.Width, config.Height, config.ResizeMethod),
+	))
+}
+
+// SelectThumbnail compares the (potentially) available thumbnails with the desired thumbnail and returns the best match
+// The algorithm is very similar to what was implemented in Synapse
+// In order of priority unless absolute, the following metrics are compared; the image is:
+// * the same size or larger than requested
+// * if a cropped image is desired, has an aspect ratio close to requested
+// * has a size close to requested
+// * if a cropped image is desired, prefer the same method, if scaled is desired, absolutely require scaled
+// * has a small file size
+// If a pre-generated thumbnail size is the best match, but it has not been generated yet, the caller can use the returned size to generate it.
+// Returns nil if no thumbnail matches the criteria
+func SelectThumbnail(desired types.ThumbnailSize, thumbnails []*types.ThumbnailMetadata, thumbnailSizes []types.ThumbnailSize) (*types.ThumbnailMetadata, *types.ThumbnailSize) {
+	var chosenThumbnail *types.ThumbnailMetadata
+	var chosenThumbnailSize *types.ThumbnailSize
+	bestFit := newThumbnailFitness()
+
+	for _, thumbnail := range thumbnails {
+		if desired.ResizeMethod == "scale" && thumbnail.ThumbnailSize.ResizeMethod != "scale" {
+			continue
+		}
+		fitness := calcThumbnailFitness(thumbnail.ThumbnailSize, thumbnail.MediaMetadata, desired)
+		if isBetter := fitness.betterThan(bestFit, desired.ResizeMethod == "crop"); isBetter {
+			bestFit = fitness
+			chosenThumbnail = thumbnail
+		}
+	}
+
+	for _, thumbnailSize := range thumbnailSizes {
+		if desired.ResizeMethod == "scale" && thumbnailSize.ResizeMethod != "scale" {
+			continue
+		}
+		fitness := calcThumbnailFitness(thumbnailSize, nil, desired)
+		if isBetter := fitness.betterThan(bestFit, desired.ResizeMethod == "crop"); isBetter {
+			bestFit = fitness
+			chosenThumbnailSize = &types.ThumbnailSize{
+				Width:        thumbnailSize.Width,
+				Height:       thumbnailSize.Height,
+				ResizeMethod: thumbnailSize.ResizeMethod,
+			}
+		}
+	}
+
+	return chosenThumbnail, chosenThumbnailSize
+}
+
+// getActiveThumbnailGeneration checks for active thumbnail generation
+func getActiveThumbnailGeneration(dst types.Path, config types.ThumbnailSize, activeThumbnailGeneration *types.ActiveThumbnailGeneration, maxThumbnailGenerators int, logger *log.Entry) (isActive bool, busy bool, errorReturn error) {
+	// Check if there is active thumbnail generation.
+	activeThumbnailGeneration.Lock()
+	defer activeThumbnailGeneration.Unlock()
+	if activeThumbnailGenerationResult, ok := activeThumbnailGeneration.PathToResult[string(dst)]; ok {
+		logger.Info("Waiting for another goroutine to generate the thumbnail.")
+
+		// NOTE: Wait unlocks and locks again internally. There is still a deferred Unlock() that will unlock this.
+		activeThumbnailGenerationResult.Cond.Wait()
+		// Note: either there is an error or it is nil, either way returning it is correct
+		return false, false, activeThumbnailGenerationResult.Err
+	}
+
+	// Only allow thumbnail generation up to a maximum configured number. Above this we fall back to serving the
+	// original. Or in the case of pre-generation, they maybe get generated on the first request for a thumbnail if
+	// load has subsided.
+	if len(activeThumbnailGeneration.PathToResult) >= maxThumbnailGenerators {
+		return false, true, nil
+	}
+
+	// No active thumbnail generation so create one
+	activeThumbnailGeneration.PathToResult[string(dst)] = &types.ThumbnailGenerationResult{
+		Cond: &sync.Cond{L: activeThumbnailGeneration},
+	}
+
+	return true, false, nil
+}
+
+// broadcastGeneration broadcasts that thumbnail generation completed and the error to all waiting goroutines
+// Note: This should only be called by the owner of the activeThumbnailGenerationResult
+func broadcastGeneration(dst types.Path, activeThumbnailGeneration *types.ActiveThumbnailGeneration, config types.ThumbnailSize, errorReturn error, logger *log.Entry) {
+	activeThumbnailGeneration.Lock()
+	defer activeThumbnailGeneration.Unlock()
+	if activeThumbnailGenerationResult, ok := activeThumbnailGeneration.PathToResult[string(dst)]; ok {
+		logger.Info("Signalling other goroutines waiting for this goroutine to generate the thumbnail.")
+		// Note: errorReturn is a named return value error that is signalled from here to waiting goroutines
+		activeThumbnailGenerationResult.Err = errorReturn
+		activeThumbnailGenerationResult.Cond.Broadcast()
+	}
+	delete(activeThumbnailGeneration.PathToResult, string(dst))
+}
+
+// init with worst values
+func newThumbnailFitness() thumbnailFitness {
+	return thumbnailFitness{
+		isSmaller:      1,
+		aspect:         math.Inf(1),
+		size:           math.Inf(1),
+		methodMismatch: 0,
+		fileSize:       types.FileSizeBytes(math.MaxInt64),
+	}
+}
+
+func calcThumbnailFitness(size types.ThumbnailSize, metadata *types.MediaMetadata, desired types.ThumbnailSize) thumbnailFitness {
+	dW := desired.Width
+	dH := desired.Height
+	tW := size.Width
+	tH := size.Height
+
+	fitness := newThumbnailFitness()
+	// In all cases, a larger metric value is a worse fit.
+	// compare size: thumbnail smaller is true and gives 1, larger is false and gives 0
+	fitness.isSmaller = boolToInt(tW < dW || tH < dH)
+	// comparison of aspect ratios only makes sense for a request for desired cropped
+	fitness.aspect = math.Abs(float64(dW*tH - dH*tW))
+	// compare sizes
+	fitness.size = math.Abs(float64((dW - tW) * (dH - tH)))
+	// compare resize method
+	fitness.methodMismatch = boolToInt(size.ResizeMethod != desired.ResizeMethod)
+	if metadata != nil {
+		// file size
+		fitness.fileSize = metadata.FileSizeBytes
+	}
+
+	return fitness
+}
+
+func boolToInt(b bool) int {
+	if b {
+		return 1
+	}
+	return 0
+}
+
+func (a thumbnailFitness) betterThan(b thumbnailFitness, desiredCrop bool) bool {
+	// preference means returning -1
+
+	// prefer images that are not smaller
+	// e.g. isSmallerDiff > 0 means b is smaller than desired and a is not smaller
+	if a.isSmaller > b.isSmaller {
+		return false
+	} else if a.isSmaller < b.isSmaller {
+		return true
+	}
+
+	// prefer aspect ratios closer to desired only if desired cropped
+	// only cropped images have differing aspect ratios
+	// desired scaled only accepts scaled images
+	if desiredCrop {
+		if a.aspect > b.aspect {
+			return false
+		} else if a.aspect < b.aspect {
+			return true
+		}
+	}
+
+	// prefer closer in size
+	if a.size > b.size {
+		return false
+	} else if a.size < b.size {
+		return true
+	}
+
+	// prefer images using the same method
+	// e.g. methodMismatchDiff > 0 means b's method is different from desired and a's matches the desired method
+	if a.methodMismatch > b.methodMismatch {
+		return false
+	} else if a.methodMismatch < b.methodMismatch {
+		return true
+	}
+
+	// prefer smaller files
+	if a.fileSize > b.fileSize {
+		return false
+	} else if a.fileSize < b.fileSize {
+		return true
+	}
+
+	return false
+}

src/github.com/matrix-org/dendrite/mediaapi/thumbnailer/thumbnailer_bimg.go

@@ -0,0 +1,217 @@
+// Copyright 2017 Vector Creations Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// +build bimg
+
+package thumbnailer
+
+import (
+	"fmt"
+	"os"
+	"time"
+
+	log "github.com/Sirupsen/logrus"
+	"github.com/matrix-org/dendrite/mediaapi/storage"
+	"github.com/matrix-org/dendrite/mediaapi/types"
+	"gopkg.in/h2non/bimg.v1"
+)
+
+// GenerateThumbnails generates the configured thumbnail sizes for the source file
+func GenerateThumbnails(src types.Path, configs []types.ThumbnailSize, mediaMetadata *types.MediaMetadata, activeThumbnailGeneration *types.ActiveThumbnailGeneration, maxThumbnailGenerators int, db *storage.Database, logger *log.Entry) (busy bool, errorReturn error) {
+	buffer, err := bimg.Read(string(src))
+	if err != nil {
+		logger.WithError(err).WithField("src", src).Error("Failed to read src file")
+		return false, err
+	}
+	for _, config := range configs {
+		// Note: createThumbnail does locking based on activeThumbnailGeneration
+		busy, err = createThumbnail(src, buffer, config, mediaMetadata, activeThumbnailGeneration, maxThumbnailGenerators, db, logger)
+		if err != nil {
+			logger.WithError(err).WithField("src", src).Error("Failed to generate thumbnails")
+			return false, err
+		}
+		if busy {
+			return true, nil
+		}
+	}
+	return false, nil
+}
+
+// GenerateThumbnail generates the configured thumbnail size for the source file
+func GenerateThumbnail(src types.Path, config types.ThumbnailSize, mediaMetadata *types.MediaMetadata, activeThumbnailGeneration *types.ActiveThumbnailGeneration, maxThumbnailGenerators int, db *storage.Database, logger *log.Entry) (busy bool, errorReturn error) {
+	buffer, err := bimg.Read(string(src))
+	if err != nil {
+		logger.WithError(err).WithFields(log.Fields{
+			"src": src,
+		}).Error("Failed to read src file")
+		return false, err
+	}
+	// Note: createThumbnail does locking based on activeThumbnailGeneration
+	busy, err = createThumbnail(src, buffer, config, mediaMetadata, activeThumbnailGeneration, maxThumbnailGenerators, db, logger)
+	if err != nil {
+		logger.WithError(err).WithFields(log.Fields{
+			"src": src,
+		}).Error("Failed to generate thumbnails")
+		return false, err
+	}
+	if busy {
+		return true, nil
+	}
+	return false, nil
+}
+
+// createThumbnail checks if the thumbnail exists, and if not, generates it
+// Thumbnail generation is only done once for each non-existing thumbnail.
+func createThumbnail(src types.Path, buffer []byte, config types.ThumbnailSize, mediaMetadata *types.MediaMetadata, activeThumbnailGeneration *types.ActiveThumbnailGeneration, maxThumbnailGenerators int, db *storage.Database, logger *log.Entry) (busy bool, errorReturn error) {
+	logger = logger.WithFields(log.Fields{
+		"Width":        config.Width,
+		"Height":       config.Height,
+		"ResizeMethod": config.ResizeMethod,
+	})
+
+	dst := GetThumbnailPath(src, config)
+
+	// Note: getActiveThumbnailGeneration uses mutexes and conditions from activeThumbnailGeneration
+	isActive, busy, err := getActiveThumbnailGeneration(dst, config, activeThumbnailGeneration, maxThumbnailGenerators, logger)
+	if err != nil {
+		return false, err
+	}
+	if busy {
+		return true, nil
+	}
+
+	if isActive {
+		// Note: This is an active request that MUST broadcastGeneration to wake up waiting goroutines!
+		// Note: broadcastGeneration uses mutexes and conditions from activeThumbnailGeneration
+		defer func() {
+			// Note: errorReturn is the named return variable so we wrap this in a closure to re-evaluate the arguments at defer-time
+			if err := recover(); err != nil {
+				broadcastGeneration(dst, activeThumbnailGeneration, config, err.(error), logger)
+				panic(err)
+			}
+			broadcastGeneration(dst, activeThumbnailGeneration, config, errorReturn, logger)
+		}()
+	}
+
+	// Check if the thumbnail exists.
+	thumbnailMetadata, err := db.GetThumbnail(mediaMetadata.MediaID, mediaMetadata.Origin, config.Width, config.Height, config.ResizeMethod)
+	if err != nil {
+		logger.Error("Failed to query database for thumbnail.")
+		return false, err
+	}
+	if thumbnailMetadata != nil {
+		return false, nil
+	}
+	// Note: The double-negative is intentional as os.IsExist(err) != !os.IsNotExist(err).
+	// The functions are error checkers to be used in different cases.
+	if _, err = os.Stat(string(dst)); !os.IsNotExist(err) {
+		// Thumbnail exists
+		return false, nil
+	}
+
+	if isActive == false {
+		// Note: This should not happen, but we check just in case.
+		logger.Error("Failed to stat file but this is not the active thumbnail generator. This should not happen.")
+		return false, fmt.Errorf("Not active thumbnail generator. Stat error: %q", err)
+	}
+
+	start := time.Now()
+	width, height, err := resize(dst, buffer, config.Width, config.Height, config.ResizeMethod == "crop", logger)
+	if err != nil {
+		return false, err
+	}
+	logger.WithFields(log.Fields{
+		"ActualWidth":  width,
+		"ActualHeight": height,
+		"processTime":  time.Now().Sub(start),
+	}).Info("Generated thumbnail")
+
+	stat, err := os.Stat(string(dst))
+	if err != nil {
+		return false, err
+	}
+
+	thumbnailMetadata = &types.ThumbnailMetadata{
+		MediaMetadata: &types.MediaMetadata{
+			MediaID: mediaMetadata.MediaID,
+			Origin:  mediaMetadata.Origin,
+			// Note: the code currently always creates a JPEG thumbnail
+			ContentType:   types.ContentType("image/jpeg"),
+			FileSizeBytes: types.FileSizeBytes(stat.Size()),
+		},
+		ThumbnailSize: types.ThumbnailSize{
+			Width:        width,
+			Height:       height,
+			ResizeMethod: config.ResizeMethod,
+		},
+	}
+
+	err = db.StoreThumbnail(thumbnailMetadata)
+	if err != nil {
+		logger.WithError(err).WithFields(log.Fields{
+			"ActualWidth":  width,
+			"ActualHeight": height,
+		}).Error("Failed to store thumbnail metadata in database.")
+		return false, err
+	}
+
+	return false, nil
+}
+
+// resize scales an image to fit within the provided width and height
+// If the source aspect ratio is different to the target dimensions, one edge will be smaller than requested
+// If crop is set to true, the image will be scaled to fill the width and height with any excess being cropped off
+func resize(dst types.Path, buffer []byte, w, h int, crop bool, logger *log.Entry) (int, int, error) {
+	inImage := bimg.NewImage(buffer)
+
+	inSize, err := inImage.Size()
+	if err != nil {
+		return -1, -1, err
+	}
+
+	options := bimg.Options{
+		Type:    bimg.JPEG,
+		Quality: 85,
+	}
+	if crop {
+		options.Width = w
+		options.Height = h
+		options.Crop = true
+	} else {
+		inAR := float64(inSize.Width) / float64(inSize.Height)
+		outAR := float64(w) / float64(h)
+
+		if inAR > outAR {
+			// input has wider AR than requested output so use requested width and calculate height to match input AR
+			options.Width = w
+			options.Height = int(float64(w) / inAR)
+		} else {
+			// input has narrower AR than requested output so use requested height and calculate width to match input AR
+			options.Width = int(float64(h) * inAR)
+			options.Height = h
+		}
+	}
+
+	newImage, err := inImage.Process(options)
+	if err != nil {
+		return -1, -1, err
+	}
+
+	if err = bimg.Write(string(dst), newImage); err != nil {
+		logger.WithError(err).Error("Failed to resize image")
+		return -1, -1, err
+	}
+
+	return options.Width, options.Height, nil
+}

src/github.com/matrix-org/dendrite/mediaapi/thumbnailer/thumbnailer_nfnt.go

@@ -0,0 +1,249 @@
+// Copyright 2017 Vector Creations Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// +build !bimg
+
+package thumbnailer
+
+import (
+	"fmt"
+	"image"
+	"image/draw"
+	// Imported for gif codec
+	_ "image/gif"
+	"image/jpeg"
+	// Imported for png codec
+	_ "image/png"
+	"os"
+	"time"
+
+	log "github.com/Sirupsen/logrus"
+	"github.com/matrix-org/dendrite/mediaapi/storage"
+	"github.com/matrix-org/dendrite/mediaapi/types"
+	"github.com/nfnt/resize"
+)
+
+// GenerateThumbnails generates the configured thumbnail sizes for the source file
+func GenerateThumbnails(src types.Path, configs []types.ThumbnailSize, mediaMetadata *types.MediaMetadata, activeThumbnailGeneration *types.ActiveThumbnailGeneration, maxThumbnailGenerators int, db *storage.Database, logger *log.Entry) (busy bool, errorReturn error) {
+	img, err := readFile(string(src))
+	if err != nil {
+		logger.WithError(err).WithField("src", src).Error("Failed to read src file")
+		return false, err
+	}
+	for _, config := range configs {
+		// Note: createThumbnail does locking based on activeThumbnailGeneration
+		busy, err = createThumbnail(src, img, config, mediaMetadata, activeThumbnailGeneration, maxThumbnailGenerators, db, logger)
+		if err != nil {
+			logger.WithError(err).WithField("src", src).Error("Failed to generate thumbnails")
+			return false, err
+		}
+		if busy {
+			return true, nil
+		}
+	}
+	return false, nil
+}
+
+// GenerateThumbnail generates the configured thumbnail size for the source file
+func GenerateThumbnail(src types.Path, config types.ThumbnailSize, mediaMetadata *types.MediaMetadata, activeThumbnailGeneration *types.ActiveThumbnailGeneration, maxThumbnailGenerators int, db *storage.Database, logger *log.Entry) (busy bool, errorReturn error) {
+	img, err := readFile(string(src))
+	if err != nil {
+		logger.WithError(err).WithFields(log.Fields{
+			"src": src,
+		}).Error("Failed to read src file")
+		return false, err
+	}
+	// Note: createThumbnail does locking based on activeThumbnailGeneration
+	busy, err = createThumbnail(src, img, config, mediaMetadata, activeThumbnailGeneration, maxThumbnailGenerators, db, logger)
+	if err != nil {
+		logger.WithError(err).WithFields(log.Fields{
+			"src": src,
+		}).Error("Failed to generate thumbnails")
+		return false, err
+	}
+	if busy {
+		return true, nil
+	}
+	return false, nil
+}
+
+func readFile(src string) (image.Image, error) {
+	file, err := os.Open(src)
+	if err != nil {
+		return nil, err
+	}
+	defer file.Close()
+
+	img, _, err := image.Decode(file)
+	if err != nil {
+		return nil, err
+	}
+
+	return img, nil
+}
+
+func writeFile(img image.Image, dst string) error {
+	out, err := os.Create(dst)
+	if err != nil {
+		return err
+	}
+	defer out.Close()
+
+	return jpeg.Encode(out, img, &jpeg.Options{
+		Quality: 85,
+	})
+}
+
+// createThumbnail checks if the thumbnail exists, and if not, generates it
+// Thumbnail generation is only done once for each non-existing thumbnail.
+func createThumbnail(src types.Path, img image.Image, config types.ThumbnailSize, mediaMetadata *types.MediaMetadata, activeThumbnailGeneration *types.ActiveThumbnailGeneration, maxThumbnailGenerators int, db *storage.Database, logger *log.Entry) (busy bool, errorReturn error) {
+	logger = logger.WithFields(log.Fields{
+		"Width":        config.Width,
+		"Height":       config.Height,
+		"ResizeMethod": config.ResizeMethod,
+	})
+
+	dst := GetThumbnailPath(src, config)
+
+	// Note: getActiveThumbnailGeneration uses mutexes and conditions from activeThumbnailGeneration
+	isActive, busy, err := getActiveThumbnailGeneration(dst, config, activeThumbnailGeneration, maxThumbnailGenerators, logger)
+	if err != nil {
+		return false, err
+	}
+	if busy {
+		return true, nil
+	}
+
+	if isActive {
+		// Note: This is an active request that MUST broadcastGeneration to wake up waiting goroutines!
+		// Note: broadcastGeneration uses mutexes and conditions from activeThumbnailGeneration
+		defer func() {
+			// Note: errorReturn is the named return variable so we wrap this in a closure to re-evaluate the arguments at defer-time
+			// if err := recover(); err != nil {
+			// 	broadcastGeneration(dst, activeThumbnailGeneration, config, err.(error), logger)
+			// 	panic(err)
+			// }
+			broadcastGeneration(dst, activeThumbnailGeneration, config, errorReturn, logger)
+		}()
+	}
+
+	// Check if the thumbnail exists.
+	thumbnailMetadata, err := db.GetThumbnail(mediaMetadata.MediaID, mediaMetadata.Origin, config.Width, config.Height, config.ResizeMethod)
+	if err != nil {
+		logger.Error("Failed to query database for thumbnail.")
+		return false, err
+	}
+	if thumbnailMetadata != nil {
+		return false, nil
+	}
+	// Note: The double-negative is intentional as os.IsExist(err) != !os.IsNotExist(err).
+	// The functions are error checkers to be used in different cases.
+	if _, err = os.Stat(string(dst)); !os.IsNotExist(err) {
+		// Thumbnail exists
+		return false, nil
+	}
+
+	if isActive == false {
+		// Note: This should not happen, but we check just in case.
+		logger.Error("Failed to stat file but this is not the active thumbnail generator. This should not happen.")
+		return false, fmt.Errorf("Not active thumbnail generator. Stat error: %q", err)
+	}
+
+	start := time.Now()
+	width, height, err := adjustSize(dst, img, config.Width, config.Height, config.ResizeMethod == "crop", logger)
+	if err != nil {
+		return false, err
+	}
+	logger.WithFields(log.Fields{
+		"ActualWidth":  width,
+		"ActualHeight": height,
+		"processTime":  time.Now().Sub(start),
+	}).Info("Generated thumbnail")
+
+	stat, err := os.Stat(string(dst))
+	if err != nil {
+		return false, err
+	}
+
+	thumbnailMetadata = &types.ThumbnailMetadata{
+		MediaMetadata: &types.MediaMetadata{
+			MediaID: mediaMetadata.MediaID,
+			Origin:  mediaMetadata.Origin,
+			// Note: the code currently always creates a JPEG thumbnail
+			ContentType:   types.ContentType("image/jpeg"),
+			FileSizeBytes: types.FileSizeBytes(stat.Size()),
+		},
+		ThumbnailSize: types.ThumbnailSize{
+			Width:        width,
+			Height:       height,
+			ResizeMethod: config.ResizeMethod,
+		},
+	}
+
+	err = db.StoreThumbnail(thumbnailMetadata)
+	if err != nil {
+		logger.WithError(err).WithFields(log.Fields{
+			"ActualWidth":  width,
+			"ActualHeight": height,
+		}).Error("Failed to store thumbnail metadata in database.")
+		return false, err
+	}
+
+	return false, nil
+}
+
+// adjustSize scales an image to fit within the provided width and height
+// If the source aspect ratio is different to the target dimensions, one edge will be smaller than requested
+// If crop is set to true, the image will be scaled to fill the width and height with any excess being cropped off
+func adjustSize(dst types.Path, img image.Image, w, h int, crop bool, logger *log.Entry) (int, int, error) {
+	var out image.Image
+	var err error
+	if crop {
+		inAR := float64(img.Bounds().Dx()) / float64(img.Bounds().Dy())
+		outAR := float64(w) / float64(h)
+
+		var scaleW, scaleH uint
+		if inAR > outAR {
+			// input has shorter AR than requested output so use requested height and calculate width to match input AR
+			scaleW = uint(float64(h) * inAR)
+			scaleH = uint(h)
+		} else {
+			// input has taller AR than requested output so use requested width and calculate height to match input AR
+			scaleW = uint(w)
+			scaleH = uint(float64(w) / inAR)
+		}
+
+		scaled := resize.Resize(scaleW, scaleH, img, resize.Lanczos3)
+
+		xoff := (scaled.Bounds().Dx() - w) / 2
+		yoff := (scaled.Bounds().Dy() - h) / 2
+
+		tr := image.Rect(0, 0, w, h)
+		target := image.NewRGBA(tr)
+		draw.Draw(target, tr, scaled, image.Pt(xoff, yoff), draw.Src)
+		out = target
+	} else {
+		out = resize.Thumbnail(uint(w), uint(h), img, resize.Lanczos3)
+		if err != nil {
+			return -1, -1, err
+		}
+	}
+
+	if err = writeFile(out, string(dst)); err != nil {
+		logger.WithError(err).Error("Failed to encode and write image")
+		return -1, -1, err
+	}
+
+	return out.Bounds().Max.X, out.Bounds().Max.Y, nil
+}

src/github.com/matrix-org/dendrite/mediaapi/types/types.go

@@ -77,3 +77,37 @@ type ActiveRemoteRequests struct {
 	// The string key is an mxc:// URL
 	MXCToResult map[string]*RemoteRequestResult
 }
+
+// ThumbnailSize contains a single thumbnail size configuration
+type ThumbnailSize struct {
+	// Maximum width of the thumbnail image
+	Width int `yaml:"width"`
+	// Maximum height of the thumbnail image
+	Height int `yaml:"height"`
+	// ResizeMethod is one of crop or scale.
+	// crop scales to fill the requested dimensions and crops the excess.
+	// scale scales to fit the requested dimensions and one dimension may be smaller than requested.
+	ResizeMethod string `yaml:"method,omitempty"`
+}
+
+// ThumbnailMetadata contains the metadata about an individual thumbnail
+type ThumbnailMetadata struct {
+	MediaMetadata *MediaMetadata
+	ThumbnailSize ThumbnailSize
+}
+
+// ThumbnailGenerationResult is used for broadcasting the result of thumbnail generation to routines waiting on the condition
+type ThumbnailGenerationResult struct {
+	// Condition used for the generator to signal the result to all other routines waiting on this condition
+	Cond *sync.Cond
+	// Resulting error from the generation attempt
+	Err error
+}
+
+// ActiveThumbnailGeneration is a lockable map of file paths being thumbnailed
+// It is used to ensure thumbnails are only generated once.
+type ActiveThumbnailGeneration struct {
+	sync.Mutex
+	// The string key is a thumbnail file path
+	PathToResult map[string]*ThumbnailGenerationResult
+}

src/github.com/matrix-org/dendrite/mediaapi/writers/download.go

@@ -24,6 +24,7 @@ import (
 	"path/filepath"
 	"regexp"
 	"strconv"
+	"strings"
 	"sync"
 
 	log "github.com/Sirupsen/logrus"
@@ -31,6 +32,7 @@ import (
 	"github.com/matrix-org/dendrite/mediaapi/config"
 	"github.com/matrix-org/dendrite/mediaapi/fileutils"
 	"github.com/matrix-org/dendrite/mediaapi/storage"
+	"github.com/matrix-org/dendrite/mediaapi/thumbnailer"
 	"github.com/matrix-org/dendrite/mediaapi/types"
 	"github.com/matrix-org/gomatrixserverlib"
 	"github.com/matrix-org/util"
@@ -41,31 +43,56 @@ const mediaIDCharacters = "A-Za-z0-9_=-"
 // Note: unfortunately regex.MustCompile() cannot be assigned to a const
 var mediaIDRegex = regexp.MustCompile("[" + mediaIDCharacters + "]+")
 
-// downloadRequest metadata included in or derivable from an download request
+// downloadRequest metadata included in or derivable from a download or thumbnail request
 // https://matrix.org/docs/spec/client_server/r0.2.0.html#get-matrix-media-r0-download-servername-mediaid
+// http://matrix.org/docs/spec/client_server/r0.2.0.html#get-matrix-media-r0-thumbnail-servername-mediaid
 type downloadRequest struct {
-	MediaMetadata *types.MediaMetadata
-	Logger        *log.Entry
+	MediaMetadata      *types.MediaMetadata
+	IsThumbnailRequest bool
+	ThumbnailSize      types.ThumbnailSize
+	Logger             *log.Entry
 }
 
-// Download implements /download
+// Download implements /download amd /thumbnail
 // Files from this server (i.e. origin == cfg.ServerName) are served directly
 // Files from remote servers (i.e. origin != cfg.ServerName) are cached locally.
 // If they are present in the cache, they are served directly.
 // If they are not present in the cache, they are obtained from the remote server and
 // simultaneously served back to the client and written into the cache.
-func Download(w http.ResponseWriter, req *http.Request, origin gomatrixserverlib.ServerName, mediaID types.MediaID, cfg *config.MediaAPI, db *storage.Database, activeRemoteRequests *types.ActiveRemoteRequests) {
+func Download(w http.ResponseWriter, req *http.Request, origin gomatrixserverlib.ServerName, mediaID types.MediaID, cfg *config.MediaAPI, db *storage.Database, activeRemoteRequests *types.ActiveRemoteRequests, activeThumbnailGeneration *types.ActiveThumbnailGeneration, isThumbnailRequest bool) {
 	r := &downloadRequest{
 		MediaMetadata: &types.MediaMetadata{
 			MediaID: mediaID,
 			Origin:  origin,
 		},
+		IsThumbnailRequest: isThumbnailRequest,
 		Logger: util.GetLogger(req.Context()).WithFields(log.Fields{
 			"Origin":  origin,
 			"MediaID": mediaID,
 		}),
 	}
 
+	if r.IsThumbnailRequest {
+		width, err := strconv.Atoi(req.FormValue("width"))
+		if err != nil {
+			width = -1
+		}
+		height, err := strconv.Atoi(req.FormValue("height"))
+		if err != nil {
+			height = -1
+		}
+		r.ThumbnailSize = types.ThumbnailSize{
+			Width:        width,
+			Height:       height,
+			ResizeMethod: strings.ToLower(req.FormValue("method")),
+		}
+		r.Logger.WithFields(log.Fields{
+			"RequestedWidth":        r.ThumbnailSize.Width,
+			"RequestedHeight":       r.ThumbnailSize.Height,
+			"RequestedResizeMethod": r.ThumbnailSize.ResizeMethod,
+		})
+	}
+
 	// request validation
 	if req.Method != "GET" {
 		r.jsonErrorResponse(w, util.JSONResponse{
@@ -80,7 +107,7 @@ func Download(w http.ResponseWriter, req *http.Request, origin gomatrixserverlib
 		return
 	}
 
-	if resErr := r.doDownload(w, cfg, db, activeRemoteRequests); resErr != nil {
+	if resErr := r.doDownload(w, cfg, db, activeRemoteRequests, activeThumbnailGeneration); resErr != nil {
 		r.jsonErrorResponse(w, *resErr)
 		return
 	}
@@ -118,10 +145,29 @@ func (r *downloadRequest) Validate() *util.JSONResponse {
 			JSON: jsonerror.NotFound("serverName must be a non-empty string"),
 		}
 	}
+
+	if r.IsThumbnailRequest {
+		if r.ThumbnailSize.Width <= 0 || r.ThumbnailSize.Height <= 0 {
+			return &util.JSONResponse{
+				Code: 400,
+				JSON: jsonerror.Unknown("width and height must be greater than 0"),
+			}
+		}
+		// Default method to scale if not set
+		if r.ThumbnailSize.ResizeMethod == "" {
+			r.ThumbnailSize.ResizeMethod = "scale"
+		}
+		if r.ThumbnailSize.ResizeMethod != "crop" && r.ThumbnailSize.ResizeMethod != "scale" {
+			return &util.JSONResponse{
+				Code: 400,
+				JSON: jsonerror.Unknown("method must be one of crop or scale"),
+			}
+		}
+	}
 	return nil
 }
 
-func (r *downloadRequest) doDownload(w http.ResponseWriter, cfg *config.MediaAPI, db *storage.Database, activeRemoteRequests *types.ActiveRemoteRequests) *util.JSONResponse {
+func (r *downloadRequest) doDownload(w http.ResponseWriter, cfg *config.MediaAPI, db *storage.Database, activeRemoteRequests *types.ActiveRemoteRequests, activeThumbnailGeneration *types.ActiveThumbnailGeneration) *util.JSONResponse {
 	// check if we have a record of the media in our database
 	mediaMetadata, err := db.GetMediaMetadata(r.MediaMetadata.MediaID, r.MediaMetadata.Origin)
 	if err != nil {
@@ -138,7 +184,7 @@ func (r *downloadRequest) doDownload(w http.ResponseWriter, cfg *config.MediaAPI
 			}
 		}
 		// If we do not have a record and the origin is remote, we need to fetch it and respond with that file
-		resErr := r.getRemoteFile(cfg, db, activeRemoteRequests)
+		resErr := r.getRemoteFile(cfg, db, activeRemoteRequests, activeThumbnailGeneration)
 		if resErr != nil {
 			return resErr
 		}
@@ -146,12 +192,12 @@ func (r *downloadRequest) doDownload(w http.ResponseWriter, cfg *config.MediaAPI
 		// If we have a record, we can respond from the local file
 		r.MediaMetadata = mediaMetadata
 	}
-	return r.respondFromLocalFile(w, cfg.AbsBasePath)
+	return r.respondFromLocalFile(w, cfg.AbsBasePath, activeThumbnailGeneration, cfg.MaxThumbnailGenerators, db, cfg.DynamicThumbnails, cfg.ThumbnailSizes)
 }
 
 // respondFromLocalFile reads a file from local storage and writes it to the http.ResponseWriter
 // Returns a util.JSONResponse error in case of error
-func (r *downloadRequest) respondFromLocalFile(w http.ResponseWriter, absBasePath types.Path) *util.JSONResponse {
+func (r *downloadRequest) respondFromLocalFile(w http.ResponseWriter, absBasePath types.Path, activeThumbnailGeneration *types.ActiveThumbnailGeneration, maxThumbnailGenerators int, db *storage.Database, dynamicThumbnails bool, thumbnailSizes []types.ThumbnailSize) *util.JSONResponse {
 	filePath, err := fileutils.GetPathFromBase64Hash(r.MediaMetadata.Base64Hash, absBasePath)
 	if err != nil {
 		r.Logger.WithError(err).Error("Failed to get file path from metadata")
@@ -181,15 +227,43 @@ func (r *downloadRequest) respondFromLocalFile(w http.ResponseWriter, absBasePat
 		return &resErr
 	}
 
-	r.Logger.WithFields(log.Fields{
-		"UploadName":    r.MediaMetadata.UploadName,
-		"Base64Hash":    r.MediaMetadata.Base64Hash,
-		"FileSizeBytes": r.MediaMetadata.FileSizeBytes,
-		"Content-Type":  r.MediaMetadata.ContentType,
-	}).Info("Responding with file")
+	var responseFile *os.File
+	var responseMetadata *types.MediaMetadata
+	if r.IsThumbnailRequest {
+		thumbFile, thumbMetadata, resErr := r.getThumbnailFile(types.Path(filePath), activeThumbnailGeneration, maxThumbnailGenerators, db, dynamicThumbnails, thumbnailSizes)
+		if thumbFile != nil {
+			defer thumbFile.Close()
+		}
+		if resErr != nil {
+			return resErr
+		}
+		if thumbFile == nil {
+			r.Logger.WithFields(log.Fields{
+				"UploadName":    r.MediaMetadata.UploadName,
+				"Base64Hash":    r.MediaMetadata.Base64Hash,
+				"FileSizeBytes": r.MediaMetadata.FileSizeBytes,
+				"ContentType":   r.MediaMetadata.ContentType,
+			}).Info("No good thumbnail found. Responding with original file.")
+			responseFile = file
+			responseMetadata = r.MediaMetadata
+		} else {
+			r.Logger.Info("Responding with thumbnail")
+			responseFile = thumbFile
+			responseMetadata = thumbMetadata.MediaMetadata
+		}
+	} else {
+		r.Logger.WithFields(log.Fields{
+			"UploadName":    r.MediaMetadata.UploadName,
+			"Base64Hash":    r.MediaMetadata.Base64Hash,
+			"FileSizeBytes": r.MediaMetadata.FileSizeBytes,
+			"ContentType":   r.MediaMetadata.ContentType,
+		}).Info("Responding with file")
+		responseFile = file
+		responseMetadata = r.MediaMetadata
+	}
 
-	w.Header().Set("Content-Type", string(r.MediaMetadata.ContentType))
-	w.Header().Set("Content-Length", strconv.FormatInt(int64(r.MediaMetadata.FileSizeBytes), 10))
+	w.Header().Set("Content-Type", string(responseMetadata.ContentType))
+	w.Header().Set("Content-Length", strconv.FormatInt(int64(responseMetadata.FileSizeBytes), 10))
 	contentSecurityPolicy := "default-src 'none';" +
 		" script-src 'none';" +
 		" plugin-types application/pdf;" +
@@ -197,7 +271,7 @@ func (r *downloadRequest) respondFromLocalFile(w http.ResponseWriter, absBasePat
 		" object-src 'self';"
 	w.Header().Set("Content-Security-Policy", contentSecurityPolicy)
 
-	if bytesResponded, err := io.Copy(w, file); err != nil {
+	if bytesResponded, err := io.Copy(w, responseFile); err != nil {
 		r.Logger.WithError(err).Warn("Failed to copy from cache")
 		if bytesResponded == 0 {
 			resErr := jsonerror.InternalServerError()
@@ -209,12 +283,107 @@ func (r *downloadRequest) respondFromLocalFile(w http.ResponseWriter, absBasePat
 	return nil
 }
 
+// Note: Thumbnail generation may be ongoing asynchronously.
+func (r *downloadRequest) getThumbnailFile(filePath types.Path, activeThumbnailGeneration *types.ActiveThumbnailGeneration, maxThumbnailGenerators int, db *storage.Database, dynamicThumbnails bool, thumbnailSizes []types.ThumbnailSize) (*os.File, *types.ThumbnailMetadata, *util.JSONResponse) {
+	var thumbnail *types.ThumbnailMetadata
+	var resErr *util.JSONResponse
+
+	if dynamicThumbnails {
+		thumbnail, resErr = r.generateThumbnail(filePath, r.ThumbnailSize, activeThumbnailGeneration, maxThumbnailGenerators, db)
+		if resErr != nil {
+			return nil, nil, resErr
+		}
+	}
+	// If dynamicThumbnails is true but there are too many thumbnails being actively generated, we can fall back
+	// to trying to use a pre-generated thumbnail
+	if thumbnail == nil {
+		thumbnails, err := db.GetThumbnails(r.MediaMetadata.MediaID, r.MediaMetadata.Origin)
+		if err != nil {
+			r.Logger.WithError(err).Error("Error looking up thumbnails")
+			resErr := jsonerror.InternalServerError()
+			return nil, nil, &resErr
+		}
+
+		// If we get a thumbnailSize, a pre-generated thumbnail would be best but it is not yet generated.
+		// If we get a thumbnail, we're done.
+		var thumbnailSize *types.ThumbnailSize
+		thumbnail, thumbnailSize = thumbnailer.SelectThumbnail(r.ThumbnailSize, thumbnails, thumbnailSizes)
+		// If dynamicThumbnails is true and we are not over-loaded then we would have generated what was requested above.
+		// So we don't try to generate a pre-generated thumbnail here.
+		if thumbnailSize != nil && dynamicThumbnails == false {
+			r.Logger.WithFields(log.Fields{
+				"Width":        thumbnailSize.Width,
+				"Height":       thumbnailSize.Height,
+				"ResizeMethod": thumbnailSize.ResizeMethod,
+			}).Info("Pre-generating thumbnail for immediate response.")
+			thumbnail, resErr = r.generateThumbnail(filePath, *thumbnailSize, activeThumbnailGeneration, maxThumbnailGenerators, db)
+			if resErr != nil {
+				return nil, nil, resErr
+			}
+		}
+	}
+	if thumbnail == nil {
+		return nil, nil, nil
+	}
+	r.Logger = r.Logger.WithFields(log.Fields{
+		"Width":         thumbnail.ThumbnailSize.Width,
+		"Height":        thumbnail.ThumbnailSize.Height,
+		"ResizeMethod":  thumbnail.ThumbnailSize.ResizeMethod,
+		"FileSizeBytes": thumbnail.MediaMetadata.FileSizeBytes,
+		"ContentType":   thumbnail.MediaMetadata.ContentType,
+	})
+	thumbPath := string(thumbnailer.GetThumbnailPath(types.Path(filePath), thumbnail.ThumbnailSize))
+	thumbFile, err := os.Open(string(thumbPath))
+	if err != nil {
+		r.Logger.WithError(err).Warn("Failed to open file")
+		resErr := jsonerror.InternalServerError()
+		return thumbFile, nil, &resErr
+	}
+	thumbStat, err := thumbFile.Stat()
+	if err != nil {
+		r.Logger.WithError(err).Warn("Failed to stat file")
+		resErr := jsonerror.InternalServerError()
+		return thumbFile, nil, &resErr
+	}
+	if types.FileSizeBytes(thumbStat.Size()) != thumbnail.MediaMetadata.FileSizeBytes {
+		r.Logger.WithError(err).Warn("Thumbnail file sizes on disk and in database differ")
+		resErr := jsonerror.InternalServerError()
+		return thumbFile, nil, &resErr
+	}
+	return thumbFile, thumbnail, nil
+}
+
+func (r *downloadRequest) generateThumbnail(filePath types.Path, thumbnailSize types.ThumbnailSize, activeThumbnailGeneration *types.ActiveThumbnailGeneration, maxThumbnailGenerators int, db *storage.Database) (*types.ThumbnailMetadata, *util.JSONResponse) {
+	logger := r.Logger.WithFields(log.Fields{
+		"Width":        thumbnailSize.Width,
+		"Height":       thumbnailSize.Height,
+		"ResizeMethod": thumbnailSize.ResizeMethod,
+	})
+	busy, err := thumbnailer.GenerateThumbnail(filePath, thumbnailSize, r.MediaMetadata, activeThumbnailGeneration, maxThumbnailGenerators, db, r.Logger)
+	if err != nil {
+		logger.WithError(err).Error("Error creating thumbnail")
+		resErr := jsonerror.InternalServerError()
+		return nil, &resErr
+	}
+	if busy {
+		return nil, nil
+	}
+	var thumbnail *types.ThumbnailMetadata
+	thumbnail, err = db.GetThumbnail(r.MediaMetadata.MediaID, r.MediaMetadata.Origin, thumbnailSize.Width, thumbnailSize.Height, thumbnailSize.ResizeMethod)
+	if err != nil {
+		logger.WithError(err).Error("Error looking up thumbnails")
+		resErr := jsonerror.InternalServerError()
+		return nil, &resErr
+	}
+	return thumbnail, nil
+}
+
 // getRemoteFile fetches the remote file and caches it locally
 // A hash map of active remote requests to a struct containing a sync.Cond is used to only download remote files once,
 // regardless of how many download requests are received.
 // Note: The named errorResponse return variable is used in a deferred broadcast of the metadata and error response to waiting goroutines.
 // Returns a util.JSONResponse error in case of error
-func (r *downloadRequest) getRemoteFile(cfg *config.MediaAPI, db *storage.Database, activeRemoteRequests *types.ActiveRemoteRequests) (errorResponse *util.JSONResponse) {
+func (r *downloadRequest) getRemoteFile(cfg *config.MediaAPI, db *storage.Database, activeRemoteRequests *types.ActiveRemoteRequests, activeThumbnailGeneration *types.ActiveThumbnailGeneration) (errorResponse *util.JSONResponse) {
 	// Note: getMediaMetadataFromActiveRequest uses mutexes and conditions from activeRemoteRequests
 	mediaMetadata, resErr := r.getMediaMetadataFromActiveRequest(activeRemoteRequests)
 	if resErr != nil {
@@ -245,7 +414,7 @@ func (r *downloadRequest) getRemoteFile(cfg *config.MediaAPI, db *storage.Databa
 
 		if mediaMetadata == nil {
 			// If we do not have a record, we need to fetch the remote file first and then respond from the local file
-			resErr := r.fetchRemoteFileAndStoreMetadata(cfg.AbsBasePath, cfg.MaxFileSizeBytes, db)
+			resErr := r.fetchRemoteFileAndStoreMetadata(cfg.AbsBasePath, *cfg.MaxFileSizeBytes, db, cfg.ThumbnailSizes, activeThumbnailGeneration, cfg.MaxThumbnailGenerators)
 			if resErr != nil {
 				return resErr
 			}
@@ -307,7 +476,7 @@ func (r *downloadRequest) broadcastMediaMetadata(activeRemoteRequests *types.Act
 }
 
 // fetchRemoteFileAndStoreMetadata fetches the file from the remote server and stores its metadata in the database
-func (r *downloadRequest) fetchRemoteFileAndStoreMetadata(absBasePath types.Path, maxFileSizeBytes types.FileSizeBytes, db *storage.Database) *util.JSONResponse {
+func (r *downloadRequest) fetchRemoteFileAndStoreMetadata(absBasePath types.Path, maxFileSizeBytes types.FileSizeBytes, db *storage.Database, thumbnailSizes []types.ThumbnailSize, activeThumbnailGeneration *types.ActiveThumbnailGeneration, maxThumbnailGenerators int) *util.JSONResponse {
 	finalPath, duplicate, resErr := r.fetchRemoteFile(absBasePath, maxFileSizeBytes)
 	if resErr != nil {
 		return resErr
@@ -317,7 +486,7 @@ func (r *downloadRequest) fetchRemoteFileAndStoreMetadata(absBasePath types.Path
 		"Base64Hash":    r.MediaMetadata.Base64Hash,
 		"UploadName":    r.MediaMetadata.UploadName,
 		"FileSizeBytes": r.MediaMetadata.FileSizeBytes,
-		"Content-Type":  r.MediaMetadata.ContentType,
+		"ContentType":   r.MediaMetadata.ContentType,
 	}).Info("Storing file metadata to media repository database")
 
 	// FIXME: timeout db request
@@ -335,13 +504,21 @@ func (r *downloadRequest) fetchRemoteFileAndStoreMetadata(absBasePath types.Path
 		return &resErr
 	}
 
-	// TODO: generate thumbnails
+	go func() {
+		busy, err := thumbnailer.GenerateThumbnails(finalPath, thumbnailSizes, r.MediaMetadata, activeThumbnailGeneration, maxThumbnailGenerators, db, r.Logger)
+		if err != nil {
+			r.Logger.WithError(err).Warn("Error generating thumbnails")
+		}
+		if busy {
+			r.Logger.Warn("Maximum number of active thumbnail generators reached. Skipping pre-generation.")
+		}
+	}()
 
 	r.Logger.WithFields(log.Fields{
 		"UploadName":    r.MediaMetadata.UploadName,
 		"Base64Hash":    r.MediaMetadata.Base64Hash,
 		"FileSizeBytes": r.MediaMetadata.FileSizeBytes,
-		"Content-Type":  r.MediaMetadata.ContentType,
+		"ContentType":   r.MediaMetadata.ContentType,
 	}).Infof("Remote file cached")
 
 	return nil

src/github.com/matrix-org/dendrite/mediaapi/writers/upload.go

@@ -27,6 +27,7 @@ import (
 	"github.com/matrix-org/dendrite/mediaapi/config"
 	"github.com/matrix-org/dendrite/mediaapi/fileutils"
 	"github.com/matrix-org/dendrite/mediaapi/storage"
+	"github.com/matrix-org/dendrite/mediaapi/thumbnailer"
 	"github.com/matrix-org/dendrite/mediaapi/types"
 	"github.com/matrix-org/util"
 )
@@ -50,13 +51,13 @@ type uploadResponse struct {
 // This implementation supports a configurable maximum file size limit in bytes. If a user tries to upload more than this, they will receive an error that their upload is too large.
 // Uploaded files are processed piece-wise to avoid DoS attacks which would starve the server of memory.
 // TODO: We should time out requests if they have not received any data within a configured timeout period.
-func Upload(req *http.Request, cfg *config.MediaAPI, db *storage.Database) util.JSONResponse {
+func Upload(req *http.Request, cfg *config.MediaAPI, db *storage.Database, activeThumbnailGeneration *types.ActiveThumbnailGeneration) util.JSONResponse {
 	r, resErr := parseAndValidateRequest(req, cfg)
 	if resErr != nil {
 		return *resErr
 	}
 
-	if resErr = r.doUpload(req.Body, cfg, db); resErr != nil {
+	if resErr = r.doUpload(req.Body, cfg, db, activeThumbnailGeneration); resErr != nil {
 		return *resErr
 	}
 
@@ -89,14 +90,14 @@ func parseAndValidateRequest(req *http.Request, cfg *config.MediaAPI) (*uploadRe
 		Logger: util.GetLogger(req.Context()).WithField("Origin", cfg.ServerName),
 	}
 
-	if resErr := r.Validate(cfg.MaxFileSizeBytes); resErr != nil {
+	if resErr := r.Validate(*cfg.MaxFileSizeBytes); resErr != nil {
 		return nil, resErr
 	}
 
 	return r, nil
 }
 
-func (r *uploadRequest) doUpload(reqReader io.Reader, cfg *config.MediaAPI, db *storage.Database) *util.JSONResponse {
+func (r *uploadRequest) doUpload(reqReader io.Reader, cfg *config.MediaAPI, db *storage.Database, activeThumbnailGeneration *types.ActiveThumbnailGeneration) *util.JSONResponse {
 	r.Logger.WithFields(log.Fields{
 		"UploadName":    r.MediaMetadata.UploadName,
 		"FileSizeBytes": r.MediaMetadata.FileSizeBytes,
@@ -107,10 +108,10 @@ func (r *uploadRequest) doUpload(reqReader io.Reader, cfg *config.MediaAPI, db *
 	// method of deduplicating files to save storage, as well as a way to conduct
 	// integrity checks on the file data in the repository.
 	// Data is truncated to maxFileSizeBytes. Content-Length was reported as 0 < Content-Length <= maxFileSizeBytes so this is OK.
-	hash, bytesWritten, tmpDir, err := fileutils.WriteTempFile(reqReader, cfg.MaxFileSizeBytes, cfg.AbsBasePath)
+	hash, bytesWritten, tmpDir, err := fileutils.WriteTempFile(reqReader, *cfg.MaxFileSizeBytes, cfg.AbsBasePath)
 	if err != nil {
 		r.Logger.WithError(err).WithFields(log.Fields{
-			"MaxFileSizeBytes": cfg.MaxFileSizeBytes,
+			"MaxFileSizeBytes": *cfg.MaxFileSizeBytes,
 		}).Warn("Error while transferring file")
 		fileutils.RemoveDir(tmpDir, r.Logger)
 		return &util.JSONResponse{
@@ -151,9 +152,7 @@ func (r *uploadRequest) doUpload(reqReader io.Reader, cfg *config.MediaAPI, db *
 		}
 	}
 
-	// TODO: generate thumbnails
-
-	if resErr := r.storeFileAndMetadata(tmpDir, cfg.AbsBasePath, db); resErr != nil {
+	if resErr := r.storeFileAndMetadata(tmpDir, cfg.AbsBasePath, db, cfg.ThumbnailSizes, activeThumbnailGeneration, cfg.MaxThumbnailGenerators); resErr != nil {
 		return resErr
 	}
 
@@ -216,7 +215,7 @@ func (r *uploadRequest) Validate(maxFileSizeBytes types.FileSizeBytes) *util.JSO
 // The order of operations is important as it avoids metadata entering the database before the file
 // is ready, and if we fail to move the file, it never gets added to the database.
 // Returns a util.JSONResponse error and cleans up directories in case of error.
-func (r *uploadRequest) storeFileAndMetadata(tmpDir types.Path, absBasePath types.Path, db *storage.Database) *util.JSONResponse {
+func (r *uploadRequest) storeFileAndMetadata(tmpDir types.Path, absBasePath types.Path, db *storage.Database, thumbnailSizes []types.ThumbnailSize, activeThumbnailGeneration *types.ActiveThumbnailGeneration, maxThumbnailGenerators int) *util.JSONResponse {
 	finalPath, duplicate, err := fileutils.MoveFileWithHashCheck(tmpDir, r.MediaMetadata, absBasePath, r.Logger)
 	if err != nil {
 		r.Logger.WithError(err).Error("Failed to move file.")
@@ -243,5 +242,15 @@ func (r *uploadRequest) storeFileAndMetadata(tmpDir types.Path, absBasePath type
 		}
 	}
 
+	go func() {
+		busy, err := thumbnailer.GenerateThumbnails(finalPath, thumbnailSizes, r.MediaMetadata, activeThumbnailGeneration, maxThumbnailGenerators, db, r.Logger)
+		if err != nil {
+			r.Logger.WithError(err).Warn("Error generating thumbnails")
+		}
+		if busy {
+			r.Logger.Warn("Maximum number of active thumbnail generators reached. Skipping pre-generation.")
+		}
+	}()
+
 	return nil
 }

vendor/manifest

@@ -114,6 +114,12 @@
 			"branch": "master",
 			"path": "/pbutil"
 		},
+		{
+			"importpath": "github.com/nfnt/resize",
+			"repository": "https://github.com/nfnt/resize",
+			"revision": "891127d8d1b52734debe1b3c3d7e747502b6c366",
+			"branch": "master"
+		},
 		{
 			"importpath": "github.com/pierrec/lz4",
 			"repository": "https://github.com/pierrec/lz4",
@@ -179,6 +185,12 @@
 			"revision": "61e43dc76f7ee59a82bdf3d71033dc12bea4c77d",
 			"branch": "master"
 		},
+		{
+			"importpath": "github.com/tj/go-debug",
+			"repository": "https://github.com/tj/go-debug",
+			"revision": "ff4a55a20a86994118644bbddc6a216da193cc13",
+			"branch": "master"
+		},
 		{
 			"importpath": "golang.org/x/crypto/bcrypt",
 			"repository": "https://go.googlesource.com/crypto",
@@ -225,6 +237,12 @@
 			"revision": "bfee1239d796830ca346767650cce5ba90d58c57",
 			"branch": "master"
 		},
+		{
+			"importpath": "gopkg.in/h2non/bimg.v1",
+			"repository": "https://gopkg.in/h2non/bimg.v1",
+			"revision": "45f8993550e71ee7b8001d40c681c6c9fa822357",
+			"branch": "master"
+		},
 		{
 			"importpath": "gopkg.in/yaml.v2",
 			"repository": "https://gopkg.in/yaml.v2",

vendor/src/github.com/nfnt/resize/LICENSE

@@ -0,0 +1,13 @@
+Copyright (c) 2012, Jan Schlicht <jan.schlicht@gmail.com>
+
+Permission to use, copy, modify, and/or distribute this software for any purpose
+with or without fee is hereby granted, provided that the above copyright notice
+and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
+OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
+THIS SOFTWARE.

vendor/src/github.com/nfnt/resize/README.md

@@ -0,0 +1,149 @@
+Resize
+======
+
+Image resizing for the [Go programming language](http://golang.org) with common interpolation methods.
+
+[![Build Status](https://travis-ci.org/nfnt/resize.svg)](https://travis-ci.org/nfnt/resize)
+
+Installation
+------------
+
+```bash
+$ go get github.com/nfnt/resize
+```
+
+It's that easy!
+
+Usage
+-----
+
+This package needs at least Go 1.1. Import package with
+
+```go
+import "github.com/nfnt/resize"
+```
+
+The resize package provides 2 functions:
+
+* `resize.Resize` creates a scaled image with new dimensions (`width`, `height`) using the interpolation function `interp`.
+  If either `width` or `height` is set to 0, it will be set to an aspect ratio preserving value.
+* `resize.Thumbnail` downscales an image preserving its aspect ratio to the maximum dimensions (`maxWidth`, `maxHeight`).
+  It will return the original image if original sizes are smaller than the provided dimensions.
+
+```go
+resize.Resize(width, height uint, img image.Image, interp resize.InterpolationFunction) image.Image
+resize.Thumbnail(maxWidth, maxHeight uint, img image.Image, interp resize.InterpolationFunction) image.Image
+```
+
+The provided interpolation functions are (from fast to slow execution time)
+
+- `NearestNeighbor`: [Nearest-neighbor interpolation](http://en.wikipedia.org/wiki/Nearest-neighbor_interpolation)
+- `Bilinear`: [Bilinear interpolation](http://en.wikipedia.org/wiki/Bilinear_interpolation)
+- `Bicubic`: [Bicubic interpolation](http://en.wikipedia.org/wiki/Bicubic_interpolation)
+- `MitchellNetravali`: [Mitchell-Netravali interpolation](http://dl.acm.org/citation.cfm?id=378514)
+- `Lanczos2`: [Lanczos resampling](http://en.wikipedia.org/wiki/Lanczos_resampling) with a=2
+- `Lanczos3`: [Lanczos resampling](http://en.wikipedia.org/wiki/Lanczos_resampling) with a=3
+
+Which of these methods gives the best results depends on your use case.
+
+Sample usage:
+
+```go
+package main
+
+import (
+	"github.com/nfnt/resize"
+	"image/jpeg"
+	"log"
+	"os"
+)
+
+func main() {
+	// open "test.jpg"
+	file, err := os.Open("test.jpg")
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	// decode jpeg into image.Image
+	img, err := jpeg.Decode(file)
+	if err != nil {
+		log.Fatal(err)
+	}
+	file.Close()
+
+	// resize to width 1000 using Lanczos resampling
+	// and preserve aspect ratio
+	m := resize.Resize(1000, 0, img, resize.Lanczos3)
+
+	out, err := os.Create("test_resized.jpg")
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer out.Close()
+
+	// write new image to file
+	jpeg.Encode(out, m, nil)
+}
+```
+
+Caveats
+-------
+
+* Optimized access routines are used for `image.RGBA`, `image.NRGBA`, `image.RGBA64`, `image.NRGBA64`, `image.YCbCr`, `image.Gray`, and `image.Gray16` types. All other image types are accessed in a generic way that will result in slow processing speed.
+* JPEG images are stored in `image.YCbCr`. This image format stores data in a way that will decrease processing speed. A resize may be up to 2 times slower than with `image.RGBA`. 
+
+
+Downsizing Samples
+-------
+
+Downsizing is not as simple as it might look like. Images have to be filtered before they are scaled down, otherwise aliasing might occur.
+Filtering is highly subjective: Applying too much will blur the whole image, too little will make aliasing become apparent.
+Resize tries to provide sane defaults that should suffice in most cases.
+
+### Artificial sample
+
+Original image
+![Rings](http://nfnt.github.com/img/rings_lg_orig.png)
+
+<table>
+<tr>
+<th><img src="http://nfnt.github.com/img/rings_300_NearestNeighbor.png" /><br>Nearest-Neighbor</th>
+<th><img src="http://nfnt.github.com/img/rings_300_Bilinear.png" /><br>Bilinear</th>
+</tr>
+<tr>
+<th><img src="http://nfnt.github.com/img/rings_300_Bicubic.png" /><br>Bicubic</th>
+<th><img src="http://nfnt.github.com/img/rings_300_MitchellNetravali.png" /><br>Mitchell-Netravali</th>
+</tr>
+<tr>
+<th><img src="http://nfnt.github.com/img/rings_300_Lanczos2.png" /><br>Lanczos2</th>
+<th><img src="http://nfnt.github.com/img/rings_300_Lanczos3.png" /><br>Lanczos3</th>
+</tr>
+</table>
+
+### Real-Life sample
+
+Original image  
+![Original](http://nfnt.github.com/img/IMG_3694_720.jpg)
+
+<table>
+<tr>
+<th><img src="http://nfnt.github.com/img/IMG_3694_300_NearestNeighbor.png" /><br>Nearest-Neighbor</th>
+<th><img src="http://nfnt.github.com/img/IMG_3694_300_Bilinear.png" /><br>Bilinear</th>
+</tr>
+<tr>
+<th><img src="http://nfnt.github.com/img/IMG_3694_300_Bicubic.png" /><br>Bicubic</th>
+<th><img src="http://nfnt.github.com/img/IMG_3694_300_MitchellNetravali.png" /><br>Mitchell-Netravali</th>
+</tr>
+<tr>
+<th><img src="http://nfnt.github.com/img/IMG_3694_300_Lanczos2.png" /><br>Lanczos2</th>
+<th><img src="http://nfnt.github.com/img/IMG_3694_300_Lanczos3.png" /><br>Lanczos3</th>
+</tr>
+</table>
+
+
+License
+-------
+
+Copyright (c) 2012 Jan Schlicht <janschlicht@gmail.com>
+Resize is released under a MIT style license.

vendor/src/github.com/nfnt/resize/converter.go

@@ -0,0 +1,438 @@
+/*
+Copyright (c) 2012, Jan Schlicht <jan.schlicht@gmail.com>
+
+Permission to use, copy, modify, and/or distribute this software for any purpose
+with or without fee is hereby granted, provided that the above copyright notice
+and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
+OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
+THIS SOFTWARE.
+*/
+
+package resize
+
+import "image"
+
+// Keep value in [0,255] range.
+func clampUint8(in int32) uint8 {
+	// casting a negative int to an uint will result in an overflown
+	// large uint. this behavior will be exploited here and in other functions
+	// to achieve a higher performance.
+	if uint32(in) < 256 {
+		return uint8(in)
+	}
+	if in > 255 {
+		return 255
+	}
+	return 0
+}
+
+// Keep value in [0,65535] range.
+func clampUint16(in int64) uint16 {
+	if uint64(in) < 65536 {
+		return uint16(in)
+	}
+	if in > 65535 {
+		return 65535
+	}
+	return 0
+}
+
+func resizeGeneric(in image.Image, out *image.RGBA64, scale float64, coeffs []int32, offset []int, filterLength int) {
+	newBounds := out.Bounds()
+	maxX := in.Bounds().Dx() - 1
+
+	for x := newBounds.Min.X; x < newBounds.Max.X; x++ {
+		for y := newBounds.Min.Y; y < newBounds.Max.Y; y++ {
+			var rgba [4]int64
+			var sum int64
+			start := offset[y]
+			ci := y * filterLength
+			for i := 0; i < filterLength; i++ {
+				coeff := coeffs[ci+i]
+				if coeff != 0 {
+					xi := start + i
+					switch {
+					case xi < 0:
+						xi = 0
+					case xi >= maxX:
+						xi = maxX
+					}
+
+					r, g, b, a := in.At(xi+in.Bounds().Min.X, x+in.Bounds().Min.Y).RGBA()
+
+					rgba[0] += int64(coeff) * int64(r)
+					rgba[1] += int64(coeff) * int64(g)
+					rgba[2] += int64(coeff) * int64(b)
+					rgba[3] += int64(coeff) * int64(a)
+					sum += int64(coeff)
+				}
+			}
+
+			offset := (y-newBounds.Min.Y)*out.Stride + (x-newBounds.Min.X)*8
+
+			value := clampUint16(rgba[0] / sum)
+			out.Pix[offset+0] = uint8(value >> 8)
+			out.Pix[offset+1] = uint8(value)
+			value = clampUint16(rgba[1] / sum)
+			out.Pix[offset+2] = uint8(value >> 8)
+			out.Pix[offset+3] = uint8(value)
+			value = clampUint16(rgba[2] / sum)
+			out.Pix[offset+4] = uint8(value >> 8)
+			out.Pix[offset+5] = uint8(value)
+			value = clampUint16(rgba[3] / sum)
+			out.Pix[offset+6] = uint8(value >> 8)
+			out.Pix[offset+7] = uint8(value)
+		}
+	}
+}
+
+func resizeRGBA(in *image.RGBA, out *image.RGBA, scale float64, coeffs []int16, offset []int, filterLength int) {
+	newBounds := out.Bounds()
+	maxX := in.Bounds().Dx() - 1
+
+	for x := newBounds.Min.X; x < newBounds.Max.X; x++ {
+		row := in.Pix[x*in.Stride:]
+		for y := newBounds.Min.Y; y < newBounds.Max.Y; y++ {
+			var rgba [4]int32
+			var sum int32
+			start := offset[y]
+			ci := y * filterLength
+			for i := 0; i < filterLength; i++ {
+				coeff := coeffs[ci+i]
+				if coeff != 0 {
+					xi := start + i
+					switch {
+					case uint(xi) < uint(maxX):
+						xi *= 4
+					case xi >= maxX:
+						xi = 4 * maxX
+					default:
+						xi = 0
+					}
+
+					rgba[0] += int32(coeff) * int32(row[xi+0])
+					rgba[1] += int32(coeff) * int32(row[xi+1])
+					rgba[2] += int32(coeff) * int32(row[xi+2])
+					rgba[3] += int32(coeff) * int32(row[xi+3])
+					sum += int32(coeff)
+				}
+			}
+
+			xo := (y-newBounds.Min.Y)*out.Stride + (x-newBounds.Min.X)*4
+
+			out.Pix[xo+0] = clampUint8(rgba[0] / sum)
+			out.Pix[xo+1] = clampUint8(rgba[1] / sum)
+			out.Pix[xo+2] = clampUint8(rgba[2] / sum)
+			out.Pix[xo+3] = clampUint8(rgba[3] / sum)
+		}
+	}
+}
+
+func resizeNRGBA(in *image.NRGBA, out *image.RGBA, scale float64, coeffs []int16, offset []int, filterLength int) {
+	newBounds := out.Bounds()
+	maxX := in.Bounds().Dx() - 1
+
+	for x := newBounds.Min.X; x < newBounds.Max.X; x++ {
+		row := in.Pix[x*in.Stride:]
+		for y := newBounds.Min.Y; y < newBounds.Max.Y; y++ {
+			var rgba [4]int32
+			var sum int32
+			start := offset[y]
+			ci := y * filterLength
+			for i := 0; i < filterLength; i++ {
+				coeff := coeffs[ci+i]
+				if coeff != 0 {
+					xi := start + i
+					switch {
+					case uint(xi) < uint(maxX):
+						xi *= 4
+					case xi >= maxX:
+						xi = 4 * maxX
+					default:
+						xi = 0
+					}
+
+					// Forward alpha-premultiplication
+					a := int32(row[xi+3])
+					r := int32(row[xi+0]) * a
+					r /= 0xff
+					g := int32(row[xi+1]) * a
+					g /= 0xff
+					b := int32(row[xi+2]) * a
+					b /= 0xff
+
+					rgba[0] += int32(coeff) * r
+					rgba[1] += int32(coeff) * g
+					rgba[2] += int32(coeff) * b
+					rgba[3] += int32(coeff) * a
+					sum += int32(coeff)
+				}
+			}
+
+			xo := (y-newBounds.Min.Y)*out.Stride + (x-newBounds.Min.X)*4
+
+			out.Pix[xo+0] = clampUint8(rgba[0] / sum)
+			out.Pix[xo+1] = clampUint8(rgba[1] / sum)
+			out.Pix[xo+2] = clampUint8(rgba[2] / sum)
+			out.Pix[xo+3] = clampUint8(rgba[3] / sum)
+		}
+	}
+}
+
+func resizeRGBA64(in *image.RGBA64, out *image.RGBA64, scale float64, coeffs []int32, offset []int, filterLength int) {
+	newBounds := out.Bounds()
+	maxX := in.Bounds().Dx() - 1
+
+	for x := newBounds.Min.X; x < newBounds.Max.X; x++ {
+		row := in.Pix[x*in.Stride:]
+		for y := newBounds.Min.Y; y < newBounds.Max.Y; y++ {
+			var rgba [4]int64
+			var sum int64
+			start := offset[y]
+			ci := y * filterLength
+			for i := 0; i < filterLength; i++ {
+				coeff := coeffs[ci+i]
+				if coeff != 0 {
+					xi := start + i
+					switch {
+					case uint(xi) < uint(maxX):
+						xi *= 8
+					case xi >= maxX:
+						xi = 8 * maxX
+					default:
+						xi = 0
+					}
+
+					rgba[0] += int64(coeff) * (int64(row[xi+0])<<8 | int64(row[xi+1]))
+					rgba[1] += int64(coeff) * (int64(row[xi+2])<<8 | int64(row[xi+3]))
+					rgba[2] += int64(coeff) * (int64(row[xi+4])<<8 | int64(row[xi+5]))
+					rgba[3] += int64(coeff) * (int64(row[xi+6])<<8 | int64(row[xi+7]))
+					sum += int64(coeff)
+				}
+			}
+
+			xo := (y-newBounds.Min.Y)*out.Stride + (x-newBounds.Min.X)*8
+
+			value := clampUint16(rgba[0] / sum)
+			out.Pix[xo+0] = uint8(value >> 8)
+			out.Pix[xo+1] = uint8(value)
+			value = clampUint16(rgba[1] / sum)
+			out.Pix[xo+2] = uint8(value >> 8)
+			out.Pix[xo+3] = uint8(value)
+			value = clampUint16(rgba[2] / sum)
+			out.Pix[xo+4] = uint8(value >> 8)
+			out.Pix[xo+5] = uint8(value)
+			value = clampUint16(rgba[3] / sum)
+			out.Pix[xo+6] = uint8(value >> 8)
+			out.Pix[xo+7] = uint8(value)
+		}
+	}
+}
+
+func resizeNRGBA64(in *image.NRGBA64, out *image.RGBA64, scale float64, coeffs []int32, offset []int, filterLength int) {
+	newBounds := out.Bounds()
+	maxX := in.Bounds().Dx() - 1
+
+	for x := newBounds.Min.X; x < newBounds.Max.X; x++ {
+		row := in.Pix[x*in.Stride:]
+		for y := newBounds.Min.Y; y < newBounds.Max.Y; y++ {
+			var rgba [4]int64
+			var sum int64
+			start := offset[y]
+			ci := y * filterLength
+			for i := 0; i < filterLength; i++ {
+				coeff := coeffs[ci+i]
+				if coeff != 0 {
+					xi := start + i
+					switch {
+					case uint(xi) < uint(maxX):
+						xi *= 8
+					case xi >= maxX:
+						xi = 8 * maxX
+					default:
+						xi = 0
+					}
+
+					// Forward alpha-premultiplication
+					a := int64(uint16(row[xi+6])<<8 | uint16(row[xi+7]))
+					r := int64(uint16(row[xi+0])<<8|uint16(row[xi+1])) * a
+					r /= 0xffff
+					g := int64(uint16(row[xi+2])<<8|uint16(row[xi+3])) * a
+					g /= 0xffff
+					b := int64(uint16(row[xi+4])<<8|uint16(row[xi+5])) * a
+					b /= 0xffff
+
+					rgba[0] += int64(coeff) * r
+					rgba[1] += int64(coeff) * g
+					rgba[2] += int64(coeff) * b
+					rgba[3] += int64(coeff) * a
+					sum += int64(coeff)
+				}
+			}
+
+			xo := (y-newBounds.Min.Y)*out.Stride + (x-newBounds.Min.X)*8
+
+			value := clampUint16(rgba[0] / sum)
+			out.Pix[xo+0] = uint8(value >> 8)
+			out.Pix[xo+1] = uint8(value)
+			value = clampUint16(rgba[1] / sum)
+			out.Pix[xo+2] = uint8(value >> 8)
+			out.Pix[xo+3] = uint8(value)
+			value = clampUint16(rgba[2] / sum)
+			out.Pix[xo+4] = uint8(value >> 8)
+			out.Pix[xo+5] = uint8(value)
+			value = clampUint16(rgba[3] / sum)
+			out.Pix[xo+6] = uint8(value >> 8)
+			out.Pix[xo+7] = uint8(value)
+		}
+	}
+}
+
+func resizeGray(in *image.Gray, out *image.Gray, scale float64, coeffs []int16, offset []int, filterLength int) {
+	newBounds := out.Bounds()
+	maxX := in.Bounds().Dx() - 1
+
+	for x := newBounds.Min.X; x < newBounds.Max.X; x++ {
+		row := in.Pix[(x-newBounds.Min.X)*in.Stride:]
+		for y := newBounds.Min.Y; y < newBounds.Max.Y; y++ {
+			var gray int32
+			var sum int32
+			start := offset[y]
+			ci := y * filterLength
+			for i := 0; i < filterLength; i++ {
+				coeff := coeffs[ci+i]
+				if coeff != 0 {
+					xi := start + i
+					switch {
+					case xi < 0:
+						xi = 0
+					case xi >= maxX:
+						xi = maxX
+					}
+					gray += int32(coeff) * int32(row[xi])
+					sum += int32(coeff)
+				}
+			}
+
+			offset := (y-newBounds.Min.Y)*out.Stride + (x - newBounds.Min.X)
+			out.Pix[offset] = clampUint8(gray / sum)
+		}
+	}
+}
+
+func resizeGray16(in *image.Gray16, out *image.Gray16, scale float64, coeffs []int32, offset []int, filterLength int) {
+	newBounds := out.Bounds()
+	maxX := in.Bounds().Dx() - 1
+
+	for x := newBounds.Min.X; x < newBounds.Max.X; x++ {
+		row := in.Pix[x*in.Stride:]
+		for y := newBounds.Min.Y; y < newBounds.Max.Y; y++ {
+			var gray int64
+			var sum int64
+			start := offset[y]
+			ci := y * filterLength
+			for i := 0; i < filterLength; i++ {
+				coeff := coeffs[ci+i]
+				if coeff != 0 {
+					xi := start + i
+					switch {
+					case uint(xi) < uint(maxX):
+						xi *= 2
+					case xi >= maxX:
+						xi = 2 * maxX
+					default:
+						xi = 0
+					}
+					gray += int64(coeff) * int64(uint16(row[xi+0])<<8|uint16(row[xi+1]))
+					sum += int64(coeff)
+				}
+			}
+
+			offset := (y-newBounds.Min.Y)*out.Stride + (x-newBounds.Min.X)*2
+			value := clampUint16(gray / sum)
+			out.Pix[offset+0] = uint8(value >> 8)
+			out.Pix[offset+1] = uint8(value)
+		}
+	}
+}
+
+func resizeYCbCr(in *ycc, out *ycc, scale float64, coeffs []int16, offset []int, filterLength int) {
+	newBounds := out.Bounds()
+	maxX := in.Bounds().Dx() - 1
+
+	for x := newBounds.Min.X; x < newBounds.Max.X; x++ {
+		row := in.Pix[x*in.Stride:]
+		for y := newBounds.Min.Y; y < newBounds.Max.Y; y++ {
+			var p [3]int32
+			var sum int32
+			start := offset[y]
+			ci := y * filterLength
+			for i := 0; i < filterLength; i++ {
+				coeff := coeffs[ci+i]
+				if coeff != 0 {
+					xi := start + i
+					switch {
+					case uint(xi) < uint(maxX):
+						xi *= 3
+					case xi >= maxX:
+						xi = 3 * maxX
+					default:
+						xi = 0
+					}
+					p[0] += int32(coeff) * int32(row[xi+0])
+					p[1] += int32(coeff) * int32(row[xi+1])
+					p[2] += int32(coeff) * int32(row[xi+2])
+					sum += int32(coeff)
+				}
+			}
+
+			xo := (y-newBounds.Min.Y)*out.Stride + (x-newBounds.Min.X)*3
+			out.Pix[xo+0] = clampUint8(p[0] / sum)
+			out.Pix[xo+1] = clampUint8(p[1] / sum)
+			out.Pix[xo+2] = clampUint8(p[2] / sum)
+		}
+	}
+}
+
+func nearestYCbCr(in *ycc, out *ycc, scale float64, coeffs []bool, offset []int, filterLength int) {
+	newBounds := out.Bounds()
+	maxX := in.Bounds().Dx() - 1
+
+	for x := newBounds.Min.X; x < newBounds.Max.X; x++ {
+		row := in.Pix[x*in.Stride:]
+		for y := newBounds.Min.Y; y < newBounds.Max.Y; y++ {
+			var p [3]float32
+			var sum float32
+			start := offset[y]
+			ci := y * filterLength
+			for i := 0; i < filterLength; i++ {
+				if coeffs[ci+i] {
+					xi := start + i
+					switch {
+					case uint(xi) < uint(maxX):
+						xi *= 3
+					case xi >= maxX:
+						xi = 3 * maxX
+					default:
+						xi = 0
+					}
+					p[0] += float32(row[xi+0])
+					p[1] += float32(row[xi+1])
+					p[2] += float32(row[xi+2])
+					sum++
+				}
+			}
+
+			xo := (y-newBounds.Min.Y)*out.Stride + (x-newBounds.Min.X)*3
+			out.Pix[xo+0] = floatToUint8(p[0] / sum)
+			out.Pix[xo+1] = floatToUint8(p[1] / sum)
+			out.Pix[xo+2] = floatToUint8(p[2] / sum)
+		}
+	}
+}

vendor/src/github.com/nfnt/resize/converter_test.go

@@ -0,0 +1,43 @@
+package resize
+
+import (
+	"testing"
+)
+
+func Test_ClampUint8(t *testing.T) {
+	var testData = []struct {
+		in       int32
+		expected uint8
+	}{
+		{0, 0},
+		{255, 255},
+		{128, 128},
+		{-2, 0},
+		{256, 255},
+	}
+	for _, test := range testData {
+		actual := clampUint8(test.in)
+		if actual != test.expected {
+			t.Fail()
+		}
+	}
+}
+
+func Test_ClampUint16(t *testing.T) {
+	var testData = []struct {
+		in       int64
+		expected uint16
+	}{
+		{0, 0},
+		{65535, 65535},
+		{128, 128},
+		{-2, 0},
+		{65536, 65535},
+	}
+	for _, test := range testData {
+		actual := clampUint16(test.in)
+		if actual != test.expected {
+			t.Fail()
+		}
+	}
+}

vendor/src/github.com/nfnt/resize/filters.go

@@ -0,0 +1,143 @@
+/*
+Copyright (c) 2012, Jan Schlicht <jan.schlicht@gmail.com>
+
+Permission to use, copy, modify, and/or distribute this software for any purpose
+with or without fee is hereby granted, provided that the above copyright notice
+and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
+OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
+THIS SOFTWARE.
+*/
+
+package resize
+
+import (
+	"math"
+)
+
+func nearest(in float64) float64 {
+	if in >= -0.5 && in < 0.5 {
+		return 1
+	}
+	return 0
+}
+
+func linear(in float64) float64 {
+	in = math.Abs(in)
+	if in <= 1 {
+		return 1 - in
+	}
+	return 0
+}
+
+func cubic(in float64) float64 {
+	in = math.Abs(in)
+	if in <= 1 {
+		return in*in*(1.5*in-2.5) + 1.0
+	}
+	if in <= 2 {
+		return in*(in*(2.5-0.5*in)-4.0) + 2.0
+	}
+	return 0
+}
+
+func mitchellnetravali(in float64) float64 {
+	in = math.Abs(in)
+	if in <= 1 {
+		return (7.0*in*in*in - 12.0*in*in + 5.33333333333) * 0.16666666666
+	}
+	if in <= 2 {
+		return (-2.33333333333*in*in*in + 12.0*in*in - 20.0*in + 10.6666666667) * 0.16666666666
+	}
+	return 0
+}
+
+func sinc(x float64) float64 {
+	x = math.Abs(x) * math.Pi
+	if x >= 1.220703e-4 {
+		return math.Sin(x) / x
+	}
+	return 1
+}
+
+func lanczos2(in float64) float64 {
+	if in > -2 && in < 2 {
+		return sinc(in) * sinc(in*0.5)
+	}
+	return 0
+}
+
+func lanczos3(in float64) float64 {
+	if in > -3 && in < 3 {
+		return sinc(in) * sinc(in*0.3333333333333333)
+	}
+	return 0
+}
+
+// range [-256,256]
+func createWeights8(dy, filterLength int, blur, scale float64, kernel func(float64) float64) ([]int16, []int, int) {
+	filterLength = filterLength * int(math.Max(math.Ceil(blur*scale), 1))
+	filterFactor := math.Min(1./(blur*scale), 1)
+
+	coeffs := make([]int16, dy*filterLength)
+	start := make([]int, dy)
+	for y := 0; y < dy; y++ {
+		interpX := scale*(float64(y)+0.5) - 0.5
+		start[y] = int(interpX) - filterLength/2 + 1
+		interpX -= float64(start[y])
+		for i := 0; i < filterLength; i++ {
+			in := (interpX - float64(i)) * filterFactor
+			coeffs[y*filterLength+i] = int16(kernel(in) * 256)
+		}
+	}
+
+	return coeffs, start, filterLength
+}
+
+// range [-65536,65536]
+func createWeights16(dy, filterLength int, blur, scale float64, kernel func(float64) float64) ([]int32, []int, int) {
+	filterLength = filterLength * int(math.Max(math.Ceil(blur*scale), 1))
+	filterFactor := math.Min(1./(blur*scale), 1)
+
+	coeffs := make([]int32, dy*filterLength)
+	start := make([]int, dy)
+	for y := 0; y < dy; y++ {
+		interpX := scale*(float64(y)+0.5) - 0.5
+		start[y] = int(interpX) - filterLength/2 + 1
+		interpX -= float64(start[y])
+		for i := 0; i < filterLength; i++ {
+			in := (interpX - float64(i)) * filterFactor
+			coeffs[y*filterLength+i] = int32(kernel(in) * 65536)
+		}
+	}
+
+	return coeffs, start, filterLength
+}
+
+func createWeightsNearest(dy, filterLength int, blur, scale float64) ([]bool, []int, int) {
+	filterLength = filterLength * int(math.Max(math.Ceil(blur*scale), 1))
+	filterFactor := math.Min(1./(blur*scale), 1)
+
+	coeffs := make([]bool, dy*filterLength)
+	start := make([]int, dy)
+	for y := 0; y < dy; y++ {
+		interpX := scale*(float64(y)+0.5) - 0.5
+		start[y] = int(interpX) - filterLength/2 + 1
+		interpX -= float64(start[y])
+		for i := 0; i < filterLength; i++ {
+			in := (interpX - float64(i)) * filterFactor
+			if in >= -0.5 && in < 0.5 {
+				coeffs[y*filterLength+i] = true
+			} else {
+				coeffs[y*filterLength+i] = false
+			}
+		}
+	}
+
+	return coeffs, start, filterLength
+}

vendor/src/github.com/nfnt/resize/nearest.go

@@ -0,0 +1,318 @@
+/*
+Copyright (c) 2014, Charlie Vieth <charlie.vieth@gmail.com>
+
+Permission to use, copy, modify, and/or distribute this software for any purpose
+with or without fee is hereby granted, provided that the above copyright notice
+and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
+OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
+THIS SOFTWARE.
+*/
+
+package resize
+
+import "image"
+
+func floatToUint8(x float32) uint8 {
+	// Nearest-neighbor values are always
+	// positive no need to check lower-bound.
+	if x > 0xfe {
+		return 0xff
+	}
+	return uint8(x)
+}
+
+func floatToUint16(x float32) uint16 {
+	if x > 0xfffe {
+		return 0xffff
+	}
+	return uint16(x)
+}
+
+func nearestGeneric(in image.Image, out *image.RGBA64, scale float64, coeffs []bool, offset []int, filterLength int) {
+	newBounds := out.Bounds()
+	maxX := in.Bounds().Dx() - 1
+
+	for x := newBounds.Min.X; x < newBounds.Max.X; x++ {
+		for y := newBounds.Min.Y; y < newBounds.Max.Y; y++ {
+			var rgba [4]float32
+			var sum float32
+			start := offset[y]
+			ci := y * filterLength
+			for i := 0; i < filterLength; i++ {
+				if coeffs[ci+i] {
+					xi := start + i
+					switch {
+					case xi < 0:
+						xi = 0
+					case xi >= maxX:
+						xi = maxX
+					}
+					r, g, b, a := in.At(xi+in.Bounds().Min.X, x+in.Bounds().Min.Y).RGBA()
+					rgba[0] += float32(r)
+					rgba[1] += float32(g)
+					rgba[2] += float32(b)
+					rgba[3] += float32(a)
+					sum++
+				}
+			}
+
+			offset := (y-newBounds.Min.Y)*out.Stride + (x-newBounds.Min.X)*8
+			value := floatToUint16(rgba[0] / sum)
+			out.Pix[offset+0] = uint8(value >> 8)
+			out.Pix[offset+1] = uint8(value)
+			value = floatToUint16(rgba[1] / sum)
+			out.Pix[offset+2] = uint8(value >> 8)
+			out.Pix[offset+3] = uint8(value)
+			value = floatToUint16(rgba[2] / sum)
+			out.Pix[offset+4] = uint8(value >> 8)
+			out.Pix[offset+5] = uint8(value)
+			value = floatToUint16(rgba[3] / sum)
+			out.Pix[offset+6] = uint8(value >> 8)
+			out.Pix[offset+7] = uint8(value)
+		}
+	}
+}
+
+func nearestRGBA(in *image.RGBA, out *image.RGBA, scale float64, coeffs []bool, offset []int, filterLength int) {
+	newBounds := out.Bounds()
+	maxX := in.Bounds().Dx() - 1
+
+	for x := newBounds.Min.X; x < newBounds.Max.X; x++ {
+		row := in.Pix[x*in.Stride:]
+		for y := newBounds.Min.Y; y < newBounds.Max.Y; y++ {
+			var rgba [4]float32
+			var sum float32
+			start := offset[y]
+			ci := y * filterLength
+			for i := 0; i < filterLength; i++ {
+				if coeffs[ci+i] {
+					xi := start + i
+					switch {
+					case uint(xi) < uint(maxX):
+						xi *= 4
+					case xi >= maxX:
+						xi = 4 * maxX
+					default:
+						xi = 0
+					}
+					rgba[0] += float32(row[xi+0])
+					rgba[1] += float32(row[xi+1])
+					rgba[2] += float32(row[xi+2])
+					rgba[3] += float32(row[xi+3])
+					sum++
+				}
+			}
+
+			xo := (y-newBounds.Min.Y)*out.Stride + (x-newBounds.Min.X)*4
+			out.Pix[xo+0] = floatToUint8(rgba[0] / sum)
+			out.Pix[xo+1] = floatToUint8(rgba[1] / sum)
+			out.Pix[xo+2] = floatToUint8(rgba[2] / sum)
+			out.Pix[xo+3] = floatToUint8(rgba[3] / sum)
+		}
+	}
+}
+
+func nearestNRGBA(in *image.NRGBA, out *image.NRGBA, scale float64, coeffs []bool, offset []int, filterLength int) {
+	newBounds := out.Bounds()
+	maxX := in.Bounds().Dx() - 1
+
+	for x := newBounds.Min.X; x < newBounds.Max.X; x++ {
+		row := in.Pix[x*in.Stride:]
+		for y := newBounds.Min.Y; y < newBounds.Max.Y; y++ {
+			var rgba [4]float32
+			var sum float32
+			start := offset[y]
+			ci := y * filterLength
+			for i := 0; i < filterLength; i++ {
+				if coeffs[ci+i] {
+					xi := start + i
+					switch {
+					case uint(xi) < uint(maxX):
+						xi *= 4
+					case xi >= maxX:
+						xi = 4 * maxX
+					default:
+						xi = 0
+					}
+					rgba[0] += float32(row[xi+0])
+					rgba[1] += float32(row[xi+1])
+					rgba[2] += float32(row[xi+2])
+					rgba[3] += float32(row[xi+3])
+					sum++
+				}
+			}
+
+			xo := (y-newBounds.Min.Y)*out.Stride + (x-newBounds.Min.X)*4
+			out.Pix[xo+0] = floatToUint8(rgba[0] / sum)
+			out.Pix[xo+1] = floatToUint8(rgba[1] / sum)
+			out.Pix[xo+2] = floatToUint8(rgba[2] / sum)
+			out.Pix[xo+3] = floatToUint8(rgba[3] / sum)
+		}
+	}
+}
+
+func nearestRGBA64(in *image.RGBA64, out *image.RGBA64, scale float64, coeffs []bool, offset []int, filterLength int) {
+	newBounds := out.Bounds()
+	maxX := in.Bounds().Dx() - 1
+
+	for x := newBounds.Min.X; x < newBounds.Max.X; x++ {
+		row := in.Pix[x*in.Stride:]
+		for y := newBounds.Min.Y; y < newBounds.Max.Y; y++ {
+			var rgba [4]float32
+			var sum float32
+			start := offset[y]
+			ci := y * filterLength
+			for i := 0; i < filterLength; i++ {
+				if coeffs[ci+i] {
+					xi := start + i
+					switch {
+					case uint(xi) < uint(maxX):
+						xi *= 8
+					case xi >= maxX:
+						xi = 8 * maxX
+					default:
+						xi = 0
+					}
+					rgba[0] += float32(uint16(row[xi+0])<<8 | uint16(row[xi+1]))
+					rgba[1] += float32(uint16(row[xi+2])<<8 | uint16(row[xi+3]))
+					rgba[2] += float32(uint16(row[xi+4])<<8 | uint16(row[xi+5]))
+					rgba[3] += float32(uint16(row[xi+6])<<8 | uint16(row[xi+7]))
+					sum++
+				}
+			}
+
+			xo := (y-newBounds.Min.Y)*out.Stride + (x-newBounds.Min.X)*8
+			value := floatToUint16(rgba[0] / sum)
+			out.Pix[xo+0] = uint8(value >> 8)
+			out.Pix[xo+1] = uint8(value)
+			value = floatToUint16(rgba[1] / sum)
+			out.Pix[xo+2] = uint8(value >> 8)
+			out.Pix[xo+3] = uint8(value)
+			value = floatToUint16(rgba[2] / sum)
+			out.Pix[xo+4] = uint8(value >> 8)
+			out.Pix[xo+5] = uint8(value)
+			value = floatToUint16(rgba[3] / sum)
+			out.Pix[xo+6] = uint8(value >> 8)
+			out.Pix[xo+7] = uint8(value)
+		}
+	}
+}
+
+func nearestNRGBA64(in *image.NRGBA64, out *image.NRGBA64, scale float64, coeffs []bool, offset []int, filterLength int) {
+	newBounds := out.Bounds()
+	maxX := in.Bounds().Dx() - 1
+
+	for x := newBounds.Min.X; x < newBounds.Max.X; x++ {
+		row := in.Pix[x*in.Stride:]
+		for y := newBounds.Min.Y; y < newBounds.Max.Y; y++ {
+			var rgba [4]float32
+			var sum float32
+			start := offset[y]
+			ci := y * filterLength
+			for i := 0; i < filterLength; i++ {
+				if coeffs[ci+i] {
+					xi := start + i
+					switch {
+					case uint(xi) < uint(maxX):
+						xi *= 8
+					case xi >= maxX:
+						xi = 8 * maxX
+					default:
+						xi = 0
+					}
+					rgba[0] += float32(uint16(row[xi+0])<<8 | uint16(row[xi+1]))
+					rgba[1] += float32(uint16(row[xi+2])<<8 | uint16(row[xi+3]))
+					rgba[2] += float32(uint16(row[xi+4])<<8 | uint16(row[xi+5]))
+					rgba[3] += float32(uint16(row[xi+6])<<8 | uint16(row[xi+7]))
+					sum++
+				}
+			}
+
+			xo := (y-newBounds.Min.Y)*out.Stride + (x-newBounds.Min.X)*8
+			value := floatToUint16(rgba[0] / sum)
+			out.Pix[xo+0] = uint8(value >> 8)
+			out.Pix[xo+1] = uint8(value)
+			value = floatToUint16(rgba[1] / sum)
+			out.Pix[xo+2] = uint8(value >> 8)
+			out.Pix[xo+3] = uint8(value)
+			value = floatToUint16(rgba[2] / sum)
+			out.Pix[xo+4] = uint8(value >> 8)
+			out.Pix[xo+5] = uint8(value)
+			value = floatToUint16(rgba[3] / sum)
+			out.Pix[xo+6] = uint8(value >> 8)
+			out.Pix[xo+7] = uint8(value)
+		}
+	}
+}
+
+func nearestGray(in *image.Gray, out *image.Gray, scale float64, coeffs []bool, offset []int, filterLength int) {
+	newBounds := out.Bounds()
+	maxX := in.Bounds().Dx() - 1
+
+	for x := newBounds.Min.X; x < newBounds.Max.X; x++ {
+		row := in.Pix[x*in.Stride:]
+		for y := newBounds.Min.Y; y < newBounds.Max.Y; y++ {
+			var gray float32
+			var sum float32
+			start := offset[y]
+			ci := y * filterLength
+			for i := 0; i < filterLength; i++ {
+				if coeffs[ci+i] {
+					xi := start + i
+					switch {
+					case xi < 0:
+						xi = 0
+					case xi >= maxX:
+						xi = maxX
+					}
+					gray += float32(row[xi])
+					sum++
+				}
+			}
+
+			offset := (y-newBounds.Min.Y)*out.Stride + (x - newBounds.Min.X)
+			out.Pix[offset] = floatToUint8(gray / sum)
+		}
+	}
+}
+
+func nearestGray16(in *image.Gray16, out *image.Gray16, scale float64, coeffs []bool, offset []int, filterLength int) {
+	newBounds := out.Bounds()
+	maxX := in.Bounds().Dx() - 1
+
+	for x := newBounds.Min.X; x < newBounds.Max.X; x++ {
+		row := in.Pix[x*in.Stride:]
+		for y := newBounds.Min.Y; y < newBounds.Max.Y; y++ {
+			var gray float32
+			var sum float32
+			start := offset[y]
+			ci := y * filterLength
+			for i := 0; i < filterLength; i++ {
+				if coeffs[ci+i] {
+					xi := start + i
+					switch {
+					case uint(xi) < uint(maxX):
+						xi *= 2
+					case xi >= maxX:
+						xi = 2 * maxX
+					default:
+						xi = 0
+					}
+					gray += float32(uint16(row[xi+0])<<8 | uint16(row[xi+1]))
+					sum++
+				}
+			}
+
+			offset := (y-newBounds.Min.Y)*out.Stride + (x-newBounds.Min.X)*2
+			value := floatToUint16(gray / sum)
+			out.Pix[offset+0] = uint8(value >> 8)
+			out.Pix[offset+1] = uint8(value)
+		}
+	}
+}

vendor/src/github.com/nfnt/resize/nearest_test.go

@@ -0,0 +1,57 @@
+/*
+Copyright (c) 2014, Charlie Vieth <charlie.vieth@gmail.com>
+
+Permission to use, copy, modify, and/or distribute this software for any purpose
+with or without fee is hereby granted, provided that the above copyright notice
+and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
+OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
+THIS SOFTWARE.
+*/
+
+package resize
+
+import "testing"
+
+func Test_FloatToUint8(t *testing.T) {
+	var testData = []struct {
+		in       float32
+		expected uint8
+	}{
+		{0, 0},
+		{255, 255},
+		{128, 128},
+		{1, 1},
+		{256, 255},
+	}
+	for _, test := range testData {
+		actual := floatToUint8(test.in)
+		if actual != test.expected {
+			t.Fail()
+		}
+	}
+}
+
+func Test_FloatToUint16(t *testing.T) {
+	var testData = []struct {
+		in       float32
+		expected uint16
+	}{
+		{0, 0},
+		{65535, 65535},
+		{128, 128},
+		{1, 1},
+		{65536, 65535},
+	}
+	for _, test := range testData {
+		actual := floatToUint16(test.in)
+		if actual != test.expected {
+			t.Fail()
+		}
+	}
+}

vendor/src/github.com/nfnt/resize/resize.go

@@ -0,0 +1,614 @@
+/*
+Copyright (c) 2012, Jan Schlicht <jan.schlicht@gmail.com>
+
+Permission to use, copy, modify, and/or distribute this software for any purpose
+with or without fee is hereby granted, provided that the above copyright notice
+and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
+OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
+THIS SOFTWARE.
+*/
+
+// Package resize implements various image resizing methods.
+//
+// The package works with the Image interface described in the image package.
+// Various interpolation methods are provided and multiple processors may be
+// utilized in the computations.
+//
+// Example:
+//     imgResized := resize.Resize(1000, 0, imgOld, resize.MitchellNetravali)
+package resize
+
+import (
+	"image"
+	"runtime"
+	"sync"
+)
+
+// An InterpolationFunction provides the parameters that describe an
+// interpolation kernel. It returns the number of samples to take
+// and the kernel function to use for sampling.
+type InterpolationFunction int
+
+// InterpolationFunction constants
+const (
+	// Nearest-neighbor interpolation
+	NearestNeighbor InterpolationFunction = iota
+	// Bilinear interpolation
+	Bilinear
+	// Bicubic interpolation (with cubic hermite spline)
+	Bicubic
+	// Mitchell-Netravali interpolation
+	MitchellNetravali
+	// Lanczos interpolation (a=2)
+	Lanczos2
+	// Lanczos interpolation (a=3)
+	Lanczos3
+)
+
+// kernal, returns an InterpolationFunctions taps and kernel.
+func (i InterpolationFunction) kernel() (int, func(float64) float64) {
+	switch i {
+	case Bilinear:
+		return 2, linear
+	case Bicubic:
+		return 4, cubic
+	case MitchellNetravali:
+		return 4, mitchellnetravali
+	case Lanczos2:
+		return 4, lanczos2
+	case Lanczos3:
+		return 6, lanczos3
+	default:
+		// Default to NearestNeighbor.
+		return 2, nearest
+	}
+}
+
+// values <1 will sharpen the image
+var blur = 1.0
+
+// Resize scales an image to new width and height using the interpolation function interp.
+// A new image with the given dimensions will be returned.
+// If one of the parameters width or height is set to 0, its size will be calculated so that
+// the aspect ratio is that of the originating image.
+// The resizing algorithm uses channels for parallel computation.
+func Resize(width, height uint, img image.Image, interp InterpolationFunction) image.Image {
+	scaleX, scaleY := calcFactors(width, height, float64(img.Bounds().Dx()), float64(img.Bounds().Dy()))
+	if width == 0 {
+		width = uint(0.7 + float64(img.Bounds().Dx())/scaleX)
+	}
+	if height == 0 {
+		height = uint(0.7 + float64(img.Bounds().Dy())/scaleY)
+	}
+
+	// Trivial case: return input image
+	if int(width) == img.Bounds().Dx() && int(height) == img.Bounds().Dy() {
+		return img
+	}
+
+	if interp == NearestNeighbor {
+		return resizeNearest(width, height, scaleX, scaleY, img, interp)
+	}
+
+	taps, kernel := interp.kernel()
+	cpus := runtime.GOMAXPROCS(0)
+	wg := sync.WaitGroup{}
+
+	// Generic access to image.Image is slow in tight loops.
+	// The optimal access has to be determined from the concrete image type.
+	switch input := img.(type) {
+	case *image.RGBA:
+		// 8-bit precision
+		temp := image.NewRGBA(image.Rect(0, 0, input.Bounds().Dy(), int(width)))
+		result := image.NewRGBA(image.Rect(0, 0, int(width), int(height)))
+
+		// horizontal filter, results in transposed temporary image
+		coeffs, offset, filterLength := createWeights8(temp.Bounds().Dy(), taps, blur, scaleX, kernel)
+		wg.Add(cpus)
+		for i := 0; i < cpus; i++ {
+			slice := makeSlice(temp, i, cpus).(*image.RGBA)
+			go func() {
+				defer wg.Done()
+				resizeRGBA(input, slice, scaleX, coeffs, offset, filterLength)
+			}()
+		}
+		wg.Wait()
+
+		// horizontal filter on transposed image, result is not transposed
+		coeffs, offset, filterLength = createWeights8(result.Bounds().Dy(), taps, blur, scaleY, kernel)
+		wg.Add(cpus)
+		for i := 0; i < cpus; i++ {
+			slice := makeSlice(result, i, cpus).(*image.RGBA)
+			go func() {
+				defer wg.Done()
+				resizeRGBA(temp, slice, scaleY, coeffs, offset, filterLength)
+			}()
+		}
+		wg.Wait()
+		return result
+	case *image.NRGBA:
+		// 8-bit precision
+		temp := image.NewRGBA(image.Rect(0, 0, input.Bounds().Dy(), int(width)))
+		result := image.NewRGBA(image.Rect(0, 0, int(width), int(height)))
+
+		// horizontal filter, results in transposed temporary image
+		coeffs, offset, filterLength := createWeights8(temp.Bounds().Dy(), taps, blur, scaleX, kernel)
+		wg.Add(cpus)
+		for i := 0; i < cpus; i++ {
+			slice := makeSlice(temp, i, cpus).(*image.RGBA)
+			go func() {
+				defer wg.Done()
+				resizeNRGBA(input, slice, scaleX, coeffs, offset, filterLength)
+			}()
+		}
+		wg.Wait()
+
+		// horizontal filter on transposed image, result is not transposed
+		coeffs, offset, filterLength = createWeights8(result.Bounds().Dy(), taps, blur, scaleY, kernel)
+		wg.Add(cpus)
+		for i := 0; i < cpus; i++ {
+			slice := makeSlice(result, i, cpus).(*image.RGBA)
+			go func() {
+				defer wg.Done()
+				resizeRGBA(temp, slice, scaleY, coeffs, offset, filterLength)
+			}()
+		}
+		wg.Wait()
+		return result
+
+	case *image.YCbCr:
+		// 8-bit precision
+		// accessing the YCbCr arrays in a tight loop is slow.
+		// converting the image to ycc increases performance by 2x.
+		temp := newYCC(image.Rect(0, 0, input.Bounds().Dy(), int(width)), input.SubsampleRatio)
+		result := newYCC(image.Rect(0, 0, int(width), int(height)), image.YCbCrSubsampleRatio444)
+
+		coeffs, offset, filterLength := createWeights8(temp.Bounds().Dy(), taps, blur, scaleX, kernel)
+		in := imageYCbCrToYCC(input)
+		wg.Add(cpus)
+		for i := 0; i < cpus; i++ {
+			slice := makeSlice(temp, i, cpus).(*ycc)
+			go func() {
+				defer wg.Done()
+				resizeYCbCr(in, slice, scaleX, coeffs, offset, filterLength)
+			}()
+		}
+		wg.Wait()
+
+		coeffs, offset, filterLength = createWeights8(result.Bounds().Dy(), taps, blur, scaleY, kernel)
+		wg.Add(cpus)
+		for i := 0; i < cpus; i++ {
+			slice := makeSlice(result, i, cpus).(*ycc)
+			go func() {
+				defer wg.Done()
+				resizeYCbCr(temp, slice, scaleY, coeffs, offset, filterLength)
+			}()
+		}
+		wg.Wait()
+		return result.YCbCr()
+	case *image.RGBA64:
+		// 16-bit precision
+		temp := image.NewRGBA64(image.Rect(0, 0, input.Bounds().Dy(), int(width)))
+		result := image.NewRGBA64(image.Rect(0, 0, int(width), int(height)))
+
+		// horizontal filter, results in transposed temporary image
+		coeffs, offset, filterLength := createWeights16(temp.Bounds().Dy(), taps, blur, scaleX, kernel)
+		wg.Add(cpus)
+		for i := 0; i < cpus; i++ {
+			slice := makeSlice(temp, i, cpus).(*image.RGBA64)
+			go func() {
+				defer wg.Done()
+				resizeRGBA64(input, slice, scaleX, coeffs, offset, filterLength)
+			}()
+		}
+		wg.Wait()
+
+		// horizontal filter on transposed image, result is not transposed
+		coeffs, offset, filterLength = createWeights16(result.Bounds().Dy(), taps, blur, scaleY, kernel)
+		wg.Add(cpus)
+		for i := 0; i < cpus; i++ {
+			slice := makeSlice(result, i, cpus).(*image.RGBA64)
+			go func() {
+				defer wg.Done()
+				resizeRGBA64(temp, slice, scaleY, coeffs, offset, filterLength)
+			}()
+		}
+		wg.Wait()
+		return result
+	case *image.NRGBA64:
+		// 16-bit precision
+		temp := image.NewRGBA64(image.Rect(0, 0, input.Bounds().Dy(), int(width)))
+		result := image.NewRGBA64(image.Rect(0, 0, int(width), int(height)))
+
+		// horizontal filter, results in transposed temporary image
+		coeffs, offset, filterLength := createWeights16(temp.Bounds().Dy(), taps, blur, scaleX, kernel)
+		wg.Add(cpus)
+		for i := 0; i < cpus; i++ {
+			slice := makeSlice(temp, i, cpus).(*image.RGBA64)
+			go func() {
+				defer wg.Done()
+				resizeNRGBA64(input, slice, scaleX, coeffs, offset, filterLength)
+			}()
+		}
+		wg.Wait()
+
+		// horizontal filter on transposed image, result is not transposed
+		coeffs, offset, filterLength = createWeights16(result.Bounds().Dy(), taps, blur, scaleY, kernel)
+		wg.Add(cpus)
+		for i := 0; i < cpus; i++ {
+			slice := makeSlice(result, i, cpus).(*image.RGBA64)
+			go func() {
+				defer wg.Done()
+				resizeRGBA64(temp, slice, scaleY, coeffs, offset, filterLength)
+			}()
+		}
+		wg.Wait()
+		return result
+	case *image.Gray:
+		// 8-bit precision
+		temp := image.NewGray(image.Rect(0, 0, input.Bounds().Dy(), int(width)))
+		result := image.NewGray(image.Rect(0, 0, int(width), int(height)))
+
+		// horizontal filter, results in transposed temporary image
+		coeffs, offset, filterLength := createWeights8(temp.Bounds().Dy(), taps, blur, scaleX, kernel)
+		wg.Add(cpus)
+		for i := 0; i < cpus; i++ {
+			slice := makeSlice(temp, i, cpus).(*image.Gray)
+			go func() {
+				defer wg.Done()
+				resizeGray(input, slice, scaleX, coeffs, offset, filterLength)
+			}()
+		}
+		wg.Wait()
+
+		// horizontal filter on transposed image, result is not transposed
+		coeffs, offset, filterLength = createWeights8(result.Bounds().Dy(), taps, blur, scaleY, kernel)
+		wg.Add(cpus)
+		for i := 0; i < cpus; i++ {
+			slice := makeSlice(result, i, cpus).(*image.Gray)
+			go func() {
+				defer wg.Done()
+				resizeGray(temp, slice, scaleY, coeffs, offset, filterLength)
+			}()
+		}
+		wg.Wait()
+		return result
+	case *image.Gray16:
+		// 16-bit precision
+		temp := image.NewGray16(image.Rect(0, 0, input.Bounds().Dy(), int(width)))
+		result := image.NewGray16(image.Rect(0, 0, int(width), int(height)))
+
+		// horizontal filter, results in transposed temporary image
+		coeffs, offset, filterLength := createWeights16(temp.Bounds().Dy(), taps, blur, scaleX, kernel)
+		wg.Add(cpus)
+		for i := 0; i < cpus; i++ {
+			slice := makeSlice(temp, i, cpus).(*image.Gray16)
+			go func() {
+				defer wg.Done()
+				resizeGray16(input, slice, scaleX, coeffs, offset, filterLength)
+			}()
+		}
+		wg.Wait()
+
+		// horizontal filter on transposed image, result is not transposed
+		coeffs, offset, filterLength = createWeights16(result.Bounds().Dy(), taps, blur, scaleY, kernel)
+		wg.Add(cpus)
+		for i := 0; i < cpus; i++ {
+			slice := makeSlice(result, i, cpus).(*image.Gray16)
+			go func() {
+				defer wg.Done()
+				resizeGray16(temp, slice, scaleY, coeffs, offset, filterLength)
+			}()
+		}
+		wg.Wait()
+		return result
+	default:
+		// 16-bit precision
+		temp := image.NewRGBA64(image.Rect(0, 0, img.Bounds().Dy(), int(width)))
+		result := image.NewRGBA64(image.Rect(0, 0, int(width), int(height)))
+
+		// horizontal filter, results in transposed temporary image
+		coeffs, offset, filterLength := createWeights16(temp.Bounds().Dy(), taps, blur, scaleX, kernel)
+		wg.Add(cpus)
+		for i := 0; i < cpus; i++ {
+			slice := makeSlice(temp, i, cpus).(*image.RGBA64)
+			go func() {
+				defer wg.Done()
+				resizeGeneric(img, slice, scaleX, coeffs, offset, filterLength)
+			}()
+		}
+		wg.Wait()
+
+		// horizontal filter on transposed image, result is not transposed
+		coeffs, offset, filterLength = createWeights16(result.Bounds().Dy(), taps, blur, scaleY, kernel)
+		wg.Add(cpus)
+		for i := 0; i < cpus; i++ {
+			slice := makeSlice(result, i, cpus).(*image.RGBA64)
+			go func() {
+				defer wg.Done()
+				resizeRGBA64(temp, slice, scaleY, coeffs, offset, filterLength)
+			}()
+		}
+		wg.Wait()
+		return result
+	}
+}
+
+func resizeNearest(width, height uint, scaleX, scaleY float64, img image.Image, interp InterpolationFunction) image.Image {
+	taps, _ := interp.kernel()
+	cpus := runtime.GOMAXPROCS(0)
+	wg := sync.WaitGroup{}
+
+	switch input := img.(type) {
+	case *image.RGBA:
+		// 8-bit precision
+		temp := image.NewRGBA(image.Rect(0, 0, input.Bounds().Dy(), int(width)))
+		result := image.NewRGBA(image.Rect(0, 0, int(width), int(height)))
+
+		// horizontal filter, results in transposed temporary image
+		coeffs, offset, filterLength := createWeightsNearest(temp.Bounds().Dy(), taps, blur, scaleX)
+		wg.Add(cpus)
+		for i := 0; i < cpus; i++ {
+			slice := makeSlice(temp, i, cpus).(*image.RGBA)
+			go func() {
+				defer wg.Done()
+				nearestRGBA(input, slice, scaleX, coeffs, offset, filterLength)
+			}()
+		}
+		wg.Wait()
+
+		// horizontal filter on transposed image, result is not transposed
+		coeffs, offset, filterLength = createWeightsNearest(result.Bounds().Dy(), taps, blur, scaleY)
+		wg.Add(cpus)
+		for i := 0; i < cpus; i++ {
+			slice := makeSlice(result, i, cpus).(*image.RGBA)
+			go func() {
+				defer wg.Done()
+				nearestRGBA(temp, slice, scaleY, coeffs, offset, filterLength)
+			}()
+		}
+		wg.Wait()
+		return result
+	case *image.NRGBA:
+		// 8-bit precision
+		temp := image.NewNRGBA(image.Rect(0, 0, input.Bounds().Dy(), int(width)))
+		result := image.NewNRGBA(image.Rect(0, 0, int(width), int(height)))
+
+		// horizontal filter, results in transposed temporary image
+		coeffs, offset, filterLength := createWeightsNearest(temp.Bounds().Dy(), taps, blur, scaleX)
+		wg.Add(cpus)
+		for i := 0; i < cpus; i++ {
+			slice := makeSlice(temp, i, cpus).(*image.NRGBA)
+			go func() {
+				defer wg.Done()
+				nearestNRGBA(input, slice, scaleX, coeffs, offset, filterLength)
+			}()
+		}
+		wg.Wait()
+
+		// horizontal filter on transposed image, result is not transposed
+		coeffs, offset, filterLength = createWeightsNearest(result.Bounds().Dy(), taps, blur, scaleY)
+		wg.Add(cpus)
+		for i := 0; i < cpus; i++ {
+			slice := makeSlice(result, i, cpus).(*image.NRGBA)
+			go func() {
+				defer wg.Done()
+				nearestNRGBA(temp, slice, scaleY, coeffs, offset, filterLength)
+			}()
+		}
+		wg.Wait()
+		return result
+	case *image.YCbCr:
+		// 8-bit precision
+		// accessing the YCbCr arrays in a tight loop is slow.
+		// converting the image to ycc increases performance by 2x.
+		temp := newYCC(image.Rect(0, 0, input.Bounds().Dy(), int(width)), input.SubsampleRatio)
+		result := newYCC(image.Rect(0, 0, int(width), int(height)), image.YCbCrSubsampleRatio444)
+
+		coeffs, offset, filterLength := createWeightsNearest(temp.Bounds().Dy(), taps, blur, scaleX)
+		in := imageYCbCrToYCC(input)
+		wg.Add(cpus)
+		for i := 0; i < cpus; i++ {
+			slice := makeSlice(temp, i, cpus).(*ycc)
+			go func() {
+				defer wg.Done()
+				nearestYCbCr(in, slice, scaleX, coeffs, offset, filterLength)
+			}()
+		}
+		wg.Wait()
+
+		coeffs, offset, filterLength = createWeightsNearest(result.Bounds().Dy(), taps, blur, scaleY)
+		wg.Add(cpus)
+		for i := 0; i < cpus; i++ {
+			slice := makeSlice(result, i, cpus).(*ycc)
+			go func() {
+				defer wg.Done()
+				nearestYCbCr(temp, slice, scaleY, coeffs, offset, filterLength)
+			}()
+		}
+		wg.Wait()
+		return result.YCbCr()
+	case *image.RGBA64:
+		// 16-bit precision
+		temp := image.NewRGBA64(image.Rect(0, 0, input.Bounds().Dy(), int(width)))
+		result := image.NewRGBA64(image.Rect(0, 0, int(width), int(height)))
+
+		// horizontal filter, results in transposed temporary image
+		coeffs, offset, filterLength := createWeightsNearest(temp.Bounds().Dy(), taps, blur, scaleX)
+		wg.Add(cpus)
+		for i := 0; i < cpus; i++ {
+			slice := makeSlice(temp, i, cpus).(*image.RGBA64)
+			go func() {
+				defer wg.Done()
+				nearestRGBA64(input, slice, scaleX, coeffs, offset, filterLength)
+			}()
+		}
+		wg.Wait()
+
+		// horizontal filter on transposed image, result is not transposed
+		coeffs, offset, filterLength = createWeightsNearest(result.Bounds().Dy(), taps, blur, scaleY)
+		wg.Add(cpus)
+		for i := 0; i < cpus; i++ {
+			slice := makeSlice(result, i, cpus).(*image.RGBA64)
+			go func() {
+				defer wg.Done()
+				nearestRGBA64(temp, slice, scaleY, coeffs, offset, filterLength)
+			}()
+		}
+		wg.Wait()
+		return result
+	case *image.NRGBA64:
+		// 16-bit precision
+		temp := image.NewNRGBA64(image.Rect(0, 0, input.Bounds().Dy(), int(width)))
+		result := image.NewNRGBA64(image.Rect(0, 0, int(width), int(height)))
+
+		// horizontal filter, results in transposed temporary image
+		coeffs, offset, filterLength := createWeightsNearest(temp.Bounds().Dy(), taps, blur, scaleX)
+		wg.Add(cpus)
+		for i := 0; i < cpus; i++ {
+			slice := makeSlice(temp, i, cpus).(*image.NRGBA64)
+			go func() {
+				defer wg.Done()
+				nearestNRGBA64(input, slice, scaleX, coeffs, offset, filterLength)
+			}()
+		}
+		wg.Wait()
+
+		// horizontal filter on transposed image, result is not transposed
+		coeffs, offset, filterLength = createWeightsNearest(result.Bounds().Dy(), taps, blur, scaleY)
+		wg.Add(cpus)
+		for i := 0; i < cpus; i++ {
+			slice := makeSlice(result, i, cpus).(*image.NRGBA64)
+			go func() {
+				defer wg.Done()
+				nearestNRGBA64(temp, slice, scaleY, coeffs, offset, filterLength)
+			}()
+		}
+		wg.Wait()
+		return result
+	case *image.Gray:
+		// 8-bit precision
+		temp := image.NewGray(image.Rect(0, 0, input.Bounds().Dy(), int(width)))
+		result := image.NewGray(image.Rect(0, 0, int(width), int(height)))
+
+		// horizontal filter, results in transposed temporary image
+		coeffs, offset, filterLength := createWeightsNearest(temp.Bounds().Dy(), taps, blur, scaleX)
+		wg.Add(cpus)
+		for i := 0; i < cpus; i++ {
+			slice := makeSlice(temp, i, cpus).(*image.Gray)
+			go func() {
+				defer wg.Done()
+				nearestGray(input, slice, scaleX, coeffs, offset, filterLength)
+			}()
+		}
+		wg.Wait()
+
+		// horizontal filter on transposed image, result is not transposed
+		coeffs, offset, filterLength = createWeightsNearest(result.Bounds().Dy(), taps, blur, scaleY)
+		wg.Add(cpus)
+		for i := 0; i < cpus; i++ {
+			slice := makeSlice(result, i, cpus).(*image.Gray)
+			go func() {
+				defer wg.Done()
+				nearestGray(temp, slice, scaleY, coeffs, offset, filterLength)
+			}()
+		}
+		wg.Wait()
+		return result
+	case *image.Gray16:
+		// 16-bit precision
+		temp := image.NewGray16(image.Rect(0, 0, input.Bounds().Dy(), int(width)))
+		result := image.NewGray16(image.Rect(0, 0, int(width), int(height)))
+
+		// horizontal filter, results in transposed temporary image
+		coeffs, offset, filterLength := createWeightsNearest(temp.Bounds().Dy(), taps, blur, scaleX)
+		wg.Add(cpus)
+		for i := 0; i < cpus; i++ {
+			slice := makeSlice(temp, i, cpus).(*image.Gray16)
+			go func() {
+				defer wg.Done()
+				nearestGray16(input, slice, scaleX, coeffs, offset, filterLength)
+			}()
+		}
+		wg.Wait()
+
+		// horizontal filter on transposed image, result is not transposed
+		coeffs, offset, filterLength = createWeightsNearest(result.Bounds().Dy(), taps, blur, scaleY)
+		wg.Add(cpus)
+		for i := 0; i < cpus; i++ {
+			slice := makeSlice(result, i, cpus).(*image.Gray16)
+			go func() {
+				defer wg.Done()
+				nearestGray16(temp, slice, scaleY, coeffs, offset, filterLength)
+			}()
+		}
+		wg.Wait()
+		return result
+	default:
+		// 16-bit precision
+		temp := image.NewRGBA64(image.Rect(0, 0, img.Bounds().Dy(), int(width)))
+		result := image.NewRGBA64(image.Rect(0, 0, int(width), int(height)))
+
+		// horizontal filter, results in transposed temporary image
+		coeffs, offset, filterLength := createWeightsNearest(temp.Bounds().Dy(), taps, blur, scaleX)
+		wg.Add(cpus)
+		for i := 0; i < cpus; i++ {
+			slice := makeSlice(temp, i, cpus).(*image.RGBA64)
+			go func() {
+				defer wg.Done()
+				nearestGeneric(img, slice, scaleX, coeffs, offset, filterLength)
+			}()
+		}
+		wg.Wait()
+
+		// horizontal filter on transposed image, result is not transposed
+		coeffs, offset, filterLength = createWeightsNearest(result.Bounds().Dy(), taps, blur, scaleY)
+		wg.Add(cpus)
+		for i := 0; i < cpus; i++ {
+			slice := makeSlice(result, i, cpus).(*image.RGBA64)
+			go func() {
+				defer wg.Done()
+				nearestRGBA64(temp, slice, scaleY, coeffs, offset, filterLength)
+			}()
+		}
+		wg.Wait()
+		return result
+	}
+
+}
+
+// Calculates scaling factors using old and new image dimensions.
+func calcFactors(width, height uint, oldWidth, oldHeight float64) (scaleX, scaleY float64) {
+	if width == 0 {
+		if height == 0 {
+			scaleX = 1.0
+			scaleY = 1.0
+		} else {
+			scaleY = oldHeight / float64(height)
+			scaleX = scaleY
+		}
+	} else {
+		scaleX = oldWidth / float64(width)
+		if height == 0 {
+			scaleY = scaleX
+		} else {
+			scaleY = oldHeight / float64(height)
+		}
+	}
+	return
+}
+
+type imageWithSubImage interface {
+	image.Image
+	SubImage(image.Rectangle) image.Image
+}
+
+func makeSlice(img imageWithSubImage, i, n int) image.Image {
+	return img.SubImage(image.Rect(img.Bounds().Min.X, img.Bounds().Min.Y+i*img.Bounds().Dy()/n, img.Bounds().Max.X, img.Bounds().Min.Y+(i+1)*img.Bounds().Dy()/n))
+}

vendor/src/github.com/nfnt/resize/resize_test.go

@@ -0,0 +1,330 @@
+package resize
+
+import (
+	"image"
+	"image/color"
+	"runtime"
+	"testing"
+)
+
+var img = image.NewGray16(image.Rect(0, 0, 3, 3))
+
+func init() {
+	runtime.GOMAXPROCS(runtime.NumCPU())
+	img.Set(1, 1, color.White)
+}
+
+func Test_Param1(t *testing.T) {
+	m := Resize(0, 0, img, NearestNeighbor)
+	if m.Bounds() != img.Bounds() {
+		t.Fail()
+	}
+}
+
+func Test_Param2(t *testing.T) {
+	m := Resize(100, 0, img, NearestNeighbor)
+	if m.Bounds() != image.Rect(0, 0, 100, 100) {
+		t.Fail()
+	}
+}
+
+func Test_ZeroImg(t *testing.T) {
+	zeroImg := image.NewGray16(image.Rect(0, 0, 0, 0))
+
+	m := Resize(0, 0, zeroImg, NearestNeighbor)
+	if m.Bounds() != zeroImg.Bounds() {
+		t.Fail()
+	}
+}
+
+func Test_CorrectResize(t *testing.T) {
+	zeroImg := image.NewGray16(image.Rect(0, 0, 256, 256))
+
+	m := Resize(60, 0, zeroImg, NearestNeighbor)
+	if m.Bounds() != image.Rect(0, 0, 60, 60) {
+		t.Fail()
+	}
+}
+
+func Test_SameColorWithRGBA(t *testing.T) {
+	img := image.NewRGBA(image.Rect(0, 0, 20, 20))
+	for y := img.Bounds().Min.Y; y < img.Bounds().Max.Y; y++ {
+		for x := img.Bounds().Min.X; x < img.Bounds().Max.X; x++ {
+			img.SetRGBA(x, y, color.RGBA{0x80, 0x80, 0x80, 0xFF})
+		}
+	}
+	out := Resize(10, 10, img, Lanczos3)
+	for y := out.Bounds().Min.Y; y < out.Bounds().Max.Y; y++ {
+		for x := out.Bounds().Min.X; x < out.Bounds().Max.X; x++ {
+			color := out.At(x, y).(color.RGBA)
+			if color.R != 0x80 || color.G != 0x80 || color.B != 0x80 || color.A != 0xFF {
+				t.Errorf("%+v", color)
+			}
+		}
+	}
+}
+
+func Test_SameColorWithNRGBA(t *testing.T) {
+	img := image.NewNRGBA(image.Rect(0, 0, 20, 20))
+	for y := img.Bounds().Min.Y; y < img.Bounds().Max.Y; y++ {
+		for x := img.Bounds().Min.X; x < img.Bounds().Max.X; x++ {
+			img.SetNRGBA(x, y, color.NRGBA{0x80, 0x80, 0x80, 0xFF})
+		}
+	}
+	out := Resize(10, 10, img, Lanczos3)
+	for y := out.Bounds().Min.Y; y < out.Bounds().Max.Y; y++ {
+		for x := out.Bounds().Min.X; x < out.Bounds().Max.X; x++ {
+			color := out.At(x, y).(color.RGBA)
+			if color.R != 0x80 || color.G != 0x80 || color.B != 0x80 || color.A != 0xFF {
+				t.Errorf("%+v", color)
+			}
+		}
+	}
+}
+
+func Test_SameColorWithRGBA64(t *testing.T) {
+	img := image.NewRGBA64(image.Rect(0, 0, 20, 20))
+	for y := img.Bounds().Min.Y; y < img.Bounds().Max.Y; y++ {
+		for x := img.Bounds().Min.X; x < img.Bounds().Max.X; x++ {
+			img.SetRGBA64(x, y, color.RGBA64{0x8000, 0x8000, 0x8000, 0xFFFF})
+		}
+	}
+	out := Resize(10, 10, img, Lanczos3)
+	for y := out.Bounds().Min.Y; y < out.Bounds().Max.Y; y++ {
+		for x := out.Bounds().Min.X; x < out.Bounds().Max.X; x++ {
+			color := out.At(x, y).(color.RGBA64)
+			if color.R != 0x8000 || color.G != 0x8000 || color.B != 0x8000 || color.A != 0xFFFF {
+				t.Errorf("%+v", color)
+			}
+		}
+	}
+}
+
+func Test_SameColorWithNRGBA64(t *testing.T) {
+	img := image.NewNRGBA64(image.Rect(0, 0, 20, 20))
+	for y := img.Bounds().Min.Y; y < img.Bounds().Max.Y; y++ {
+		for x := img.Bounds().Min.X; x < img.Bounds().Max.X; x++ {
+			img.SetNRGBA64(x, y, color.NRGBA64{0x8000, 0x8000, 0x8000, 0xFFFF})
+		}
+	}
+	out := Resize(10, 10, img, Lanczos3)
+	for y := out.Bounds().Min.Y; y < out.Bounds().Max.Y; y++ {
+		for x := out.Bounds().Min.X; x < out.Bounds().Max.X; x++ {
+			color := out.At(x, y).(color.RGBA64)
+			if color.R != 0x8000 || color.G != 0x8000 || color.B != 0x8000 || color.A != 0xFFFF {
+				t.Errorf("%+v", color)
+			}
+		}
+	}
+}
+
+func Test_SameColorWithGray(t *testing.T) {
+	img := image.NewGray(image.Rect(0, 0, 20, 20))
+	for y := img.Bounds().Min.Y; y < img.Bounds().Max.Y; y++ {
+		for x := img.Bounds().Min.X; x < img.Bounds().Max.X; x++ {
+			img.SetGray(x, y, color.Gray{0x80})
+		}
+	}
+	out := Resize(10, 10, img, Lanczos3)
+	for y := out.Bounds().Min.Y; y < out.Bounds().Max.Y; y++ {
+		for x := out.Bounds().Min.X; x < out.Bounds().Max.X; x++ {
+			color := out.At(x, y).(color.Gray)
+			if color.Y != 0x80 {
+				t.Errorf("%+v", color)
+			}
+		}
+	}
+}
+
+func Test_SameColorWithGray16(t *testing.T) {
+	img := image.NewGray16(image.Rect(0, 0, 20, 20))
+	for y := img.Bounds().Min.Y; y < img.Bounds().Max.Y; y++ {
+		for x := img.Bounds().Min.X; x < img.Bounds().Max.X; x++ {
+			img.SetGray16(x, y, color.Gray16{0x8000})
+		}
+	}
+	out := Resize(10, 10, img, Lanczos3)
+	for y := out.Bounds().Min.Y; y < out.Bounds().Max.Y; y++ {
+		for x := out.Bounds().Min.X; x < out.Bounds().Max.X; x++ {
+			color := out.At(x, y).(color.Gray16)
+			if color.Y != 0x8000 {
+				t.Errorf("%+v", color)
+			}
+		}
+	}
+}
+
+func Test_Bounds(t *testing.T) {
+	img := image.NewRGBA(image.Rect(20, 10, 200, 99))
+	out := Resize(80, 80, img, Lanczos2)
+	out.At(0, 0)
+}
+
+func Test_SameSizeReturnsOriginal(t *testing.T) {
+	img := image.NewRGBA(image.Rect(0, 0, 10, 10))
+	out := Resize(0, 0, img, Lanczos2)
+
+	if img != out {
+		t.Fail()
+	}
+
+	out = Resize(10, 10, img, Lanczos2)
+
+	if img != out {
+		t.Fail()
+	}
+}
+
+func Test_PixelCoordinates(t *testing.T) {
+	checkers := image.NewGray(image.Rect(0, 0, 4, 4))
+	checkers.Pix = []uint8{
+		255, 0, 255, 0,
+		0, 255, 0, 255,
+		255, 0, 255, 0,
+		0, 255, 0, 255,
+	}
+
+	resized := Resize(12, 12, checkers, NearestNeighbor).(*image.Gray)
+
+	if resized.Pix[0] != 255 || resized.Pix[1] != 255 || resized.Pix[2] != 255 {
+		t.Fail()
+	}
+
+	if resized.Pix[3] != 0 || resized.Pix[4] != 0 || resized.Pix[5] != 0 {
+		t.Fail()
+	}
+}
+
+func Test_ResizeWithPremultipliedAlpha(t *testing.T) {
+	img := image.NewRGBA(image.Rect(0, 0, 1, 4))
+	for y := img.Bounds().Min.Y; y < img.Bounds().Max.Y; y++ {
+		// 0x80 = 0.5 * 0xFF.
+		img.SetRGBA(0, y, color.RGBA{0x80, 0x80, 0x80, 0x80})
+	}
+
+	out := Resize(1, 2, img, MitchellNetravali)
+
+	outputColor := out.At(0, 0).(color.RGBA)
+	if outputColor.R != 0x80 {
+		t.Fail()
+	}
+}
+
+func Test_ResizeWithTranslucentColor(t *testing.T) {
+	img := image.NewNRGBA(image.Rect(0, 0, 1, 2))
+
+	// Set the pixel colors to an "invisible green" and white.
+	// After resizing, the green shouldn't be visible.
+	img.SetNRGBA(0, 0, color.NRGBA{0x00, 0xFF, 0x00, 0x00})
+	img.SetNRGBA(0, 1, color.NRGBA{0x00, 0x00, 0x00, 0xFF})
+
+	out := Resize(1, 1, img, Bilinear)
+
+	_, g, _, _ := out.At(0, 0).RGBA()
+	if g != 0x00 {
+		t.Errorf("%+v", g)
+	}
+}
+
+const (
+	// Use a small image size for benchmarks. We don't want memory performance
+	// to affect the benchmark results.
+	benchMaxX = 250
+	benchMaxY = 250
+
+	// Resize values near the original size require increase the amount of time
+	// resize spends converting the image.
+	benchWidth  = 200
+	benchHeight = 200
+)
+
+func benchRGBA(b *testing.B, interp InterpolationFunction) {
+	m := image.NewRGBA(image.Rect(0, 0, benchMaxX, benchMaxY))
+	// Initialize m's pixels to create a non-uniform image.
+	for y := m.Rect.Min.Y; y < m.Rect.Max.Y; y++ {
+		for x := m.Rect.Min.X; x < m.Rect.Max.X; x++ {
+			i := m.PixOffset(x, y)
+			m.Pix[i+0] = uint8(y + 4*x)
+			m.Pix[i+1] = uint8(y + 4*x)
+			m.Pix[i+2] = uint8(y + 4*x)
+			m.Pix[i+3] = uint8(4*y + x)
+		}
+	}
+
+	var out image.Image
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		out = Resize(benchWidth, benchHeight, m, interp)
+	}
+	out.At(0, 0)
+}
+
+// The names of some interpolation functions are truncated so that the columns
+// of 'go test -bench' line up.
+func Benchmark_Nearest_RGBA(b *testing.B) {
+	benchRGBA(b, NearestNeighbor)
+}
+
+func Benchmark_Bilinear_RGBA(b *testing.B) {
+	benchRGBA(b, Bilinear)
+}
+
+func Benchmark_Bicubic_RGBA(b *testing.B) {
+	benchRGBA(b, Bicubic)
+}
+
+func Benchmark_Mitchell_RGBA(b *testing.B) {
+	benchRGBA(b, MitchellNetravali)
+}
+
+func Benchmark_Lanczos2_RGBA(b *testing.B) {
+	benchRGBA(b, Lanczos2)
+}
+
+func Benchmark_Lanczos3_RGBA(b *testing.B) {
+	benchRGBA(b, Lanczos3)
+}
+
+func benchYCbCr(b *testing.B, interp InterpolationFunction) {
+	m := image.NewYCbCr(image.Rect(0, 0, benchMaxX, benchMaxY), image.YCbCrSubsampleRatio422)
+	// Initialize m's pixels to create a non-uniform image.
+	for y := m.Rect.Min.Y; y < m.Rect.Max.Y; y++ {
+		for x := m.Rect.Min.X; x < m.Rect.Max.X; x++ {
+			yi := m.YOffset(x, y)
+			ci := m.COffset(x, y)
+			m.Y[yi] = uint8(16*y + x)
+			m.Cb[ci] = uint8(y + 16*x)
+			m.Cr[ci] = uint8(y + 16*x)
+		}
+	}
+	var out image.Image
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		out = Resize(benchWidth, benchHeight, m, interp)
+	}
+	out.At(0, 0)
+}
+
+func Benchmark_Nearest_YCC(b *testing.B) {
+	benchYCbCr(b, NearestNeighbor)
+}
+
+func Benchmark_Bilinear_YCC(b *testing.B) {
+	benchYCbCr(b, Bilinear)
+}
+
+func Benchmark_Bicubic_YCC(b *testing.B) {
+	benchYCbCr(b, Bicubic)
+}
+
+func Benchmark_Mitchell_YCC(b *testing.B) {
+	benchYCbCr(b, MitchellNetravali)
+}
+
+func Benchmark_Lanczos2_YCC(b *testing.B) {
+	benchYCbCr(b, Lanczos2)
+}
+
+func Benchmark_Lanczos3_YCC(b *testing.B) {
+	benchYCbCr(b, Lanczos3)
+}

vendor/src/github.com/nfnt/resize/thumbnail.go

@@ -0,0 +1,55 @@
+/*
+Copyright (c) 2012, Jan Schlicht <jan.schlicht@gmail.com>
+
+Permission to use, copy, modify, and/or distribute this software for any purpose
+with or without fee is hereby granted, provided that the above copyright notice
+and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
+OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
+THIS SOFTWARE.
+*/
+
+package resize
+
+import (
+	"image"
+)
+
+// Thumbnail will downscale provided image to max width and height preserving
+// original aspect ratio and using the interpolation function interp.
+// It will return original image, without processing it, if original sizes
+// are already smaller than provided constraints.
+func Thumbnail(maxWidth, maxHeight uint, img image.Image, interp InterpolationFunction) image.Image {
+	origBounds := img.Bounds()
+	origWidth := uint(origBounds.Dx())
+	origHeight := uint(origBounds.Dy())
+	newWidth, newHeight := origWidth, origHeight
+
+	// Return original image if it have same or smaller size as constraints
+	if maxWidth >= origWidth && maxHeight >= origHeight {
+		return img
+	}
+
+	// Preserve aspect ratio
+	if origWidth > maxWidth {
+		newHeight = uint(origHeight * maxWidth / origWidth)
+		if newHeight < 1 {
+			newHeight = 1
+		}
+		newWidth = maxWidth
+	}
+
+	if newHeight > maxHeight {
+		newWidth = uint(newWidth * maxHeight / newHeight)
+		if newWidth < 1 {
+			newWidth = 1
+		}
+		newHeight = maxHeight
+	}
+	return Resize(newWidth, newHeight, img, interp)
+}

vendor/src/github.com/nfnt/resize/thumbnail_test.go

@@ -0,0 +1,47 @@
+package resize
+
+import (
+	"image"
+	"runtime"
+	"testing"
+)
+
+func init() {
+	runtime.GOMAXPROCS(runtime.NumCPU())
+}
+
+var thumbnailTests = []struct {
+	origWidth      int
+	origHeight     int
+	maxWidth       uint
+	maxHeight      uint
+	expectedWidth  uint
+	expectedHeight uint
+}{
+	{5, 5, 10, 10, 5, 5},
+	{10, 10, 5, 5, 5, 5},
+	{10, 50, 10, 10, 2, 10},
+	{50, 10, 10, 10, 10, 2},
+	{50, 100, 60, 90, 45, 90},
+	{120, 100, 60, 90, 60, 50},
+	{200, 250, 200, 150, 120, 150},
+}
+
+func TestThumbnail(t *testing.T) {
+	for i, tt := range thumbnailTests {
+		img := image.NewGray16(image.Rect(0, 0, tt.origWidth, tt.origHeight))
+
+		outImg := Thumbnail(tt.maxWidth, tt.maxHeight, img, NearestNeighbor)
+
+		newWidth := uint(outImg.Bounds().Dx())
+		newHeight := uint(outImg.Bounds().Dy())
+		if newWidth != tt.expectedWidth ||
+			newHeight != tt.expectedHeight {
+			t.Errorf("%d. Thumbnail(%v, %v, img, NearestNeighbor) => "+
+				"width: %v, height: %v, want width: %v, height: %v",
+				i, tt.maxWidth, tt.maxHeight,
+				newWidth, newHeight, tt.expectedWidth, tt.expectedHeight,
+			)
+		}
+	}
+}

vendor/src/github.com/nfnt/resize/ycc.go

@@ -0,0 +1,227 @@
+/*
+Copyright (c) 2014, Charlie Vieth <charlie.vieth@gmail.com>
+
+Permission to use, copy, modify, and/or distribute this software for any purpose
+with or without fee is hereby granted, provided that the above copyright notice
+and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
+OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
+THIS SOFTWARE.
+*/
+
+package resize
+
+import (
+	"image"
+	"image/color"
+)
+
+// ycc is an in memory YCbCr image.  The Y, Cb and Cr samples are held in a
+// single slice to increase resizing performance.
+type ycc struct {
+	// Pix holds the image's pixels, in Y, Cb, Cr order. The pixel at
+	// (x, y) starts at Pix[(y-Rect.Min.Y)*Stride + (x-Rect.Min.X)*3].
+	Pix []uint8
+	// Stride is the Pix stride (in bytes) between vertically adjacent pixels.
+	Stride int
+	// Rect is the image's bounds.
+	Rect image.Rectangle
+	// SubsampleRatio is the subsample ratio of the original YCbCr image.
+	SubsampleRatio image.YCbCrSubsampleRatio
+}
+
+// PixOffset returns the index of the first element of Pix that corresponds to
+// the pixel at (x, y).
+func (p *ycc) PixOffset(x, y int) int {
+	return (y-p.Rect.Min.Y)*p.Stride + (x-p.Rect.Min.X)*3
+}
+
+func (p *ycc) Bounds() image.Rectangle {
+	return p.Rect
+}
+
+func (p *ycc) ColorModel() color.Model {
+	return color.YCbCrModel
+}
+
+func (p *ycc) At(x, y int) color.Color {
+	if !(image.Point{x, y}.In(p.Rect)) {
+		return color.YCbCr{}
+	}
+	i := p.PixOffset(x, y)
+	return color.YCbCr{
+		p.Pix[i+0],
+		p.Pix[i+1],
+		p.Pix[i+2],
+	}
+}
+
+func (p *ycc) Opaque() bool {
+	return true
+}
+
+// SubImage returns an image representing the portion of the image p visible
+// through r. The returned value shares pixels with the original image.
+func (p *ycc) SubImage(r image.Rectangle) image.Image {
+	r = r.Intersect(p.Rect)
+	if r.Empty() {
+		return &ycc{SubsampleRatio: p.SubsampleRatio}
+	}
+	i := p.PixOffset(r.Min.X, r.Min.Y)
+	return &ycc{
+		Pix:            p.Pix[i:],
+		Stride:         p.Stride,
+		Rect:           r,
+		SubsampleRatio: p.SubsampleRatio,
+	}
+}
+
+// newYCC returns a new ycc with the given bounds and subsample ratio.
+func newYCC(r image.Rectangle, s image.YCbCrSubsampleRatio) *ycc {
+	w, h := r.Dx(), r.Dy()
+	buf := make([]uint8, 3*w*h)
+	return &ycc{Pix: buf, Stride: 3 * w, Rect: r, SubsampleRatio: s}
+}
+
+// YCbCr converts ycc to a YCbCr image with the same subsample ratio
+// as the YCbCr image that ycc was generated from.
+func (p *ycc) YCbCr() *image.YCbCr {
+	ycbcr := image.NewYCbCr(p.Rect, p.SubsampleRatio)
+	var off int
+
+	switch ycbcr.SubsampleRatio {
+	case image.YCbCrSubsampleRatio422:
+		for y := ycbcr.Rect.Min.Y; y < ycbcr.Rect.Max.Y; y++ {
+			yy := (y - ycbcr.Rect.Min.Y) * ycbcr.YStride
+			cy := (y - ycbcr.Rect.Min.Y) * ycbcr.CStride
+			for x := ycbcr.Rect.Min.X; x < ycbcr.Rect.Max.X; x++ {
+				xx := (x - ycbcr.Rect.Min.X)
+				yi := yy + xx
+				ci := cy + xx/2
+				ycbcr.Y[yi] = p.Pix[off+0]
+				ycbcr.Cb[ci] = p.Pix[off+1]
+				ycbcr.Cr[ci] = p.Pix[off+2]
+				off += 3
+			}
+		}
+	case image.YCbCrSubsampleRatio420:
+		for y := ycbcr.Rect.Min.Y; y < ycbcr.Rect.Max.Y; y++ {
+			yy := (y - ycbcr.Rect.Min.Y) * ycbcr.YStride
+			cy := (y/2 - ycbcr.Rect.Min.Y/2) * ycbcr.CStride
+			for x := ycbcr.Rect.Min.X; x < ycbcr.Rect.Max.X; x++ {
+				xx := (x - ycbcr.Rect.Min.X)
+				yi := yy + xx
+				ci := cy + xx/2
+				ycbcr.Y[yi] = p.Pix[off+0]
+				ycbcr.Cb[ci] = p.Pix[off+1]
+				ycbcr.Cr[ci] = p.Pix[off+2]
+				off += 3
+			}
+		}
+	case image.YCbCrSubsampleRatio440:
+		for y := ycbcr.Rect.Min.Y; y < ycbcr.Rect.Max.Y; y++ {
+			yy := (y - ycbcr.Rect.Min.Y) * ycbcr.YStride
+			cy := (y/2 - ycbcr.Rect.Min.Y/2) * ycbcr.CStride
+			for x := ycbcr.Rect.Min.X; x < ycbcr.Rect.Max.X; x++ {
+				xx := (x - ycbcr.Rect.Min.X)
+				yi := yy + xx
+				ci := cy + xx
+				ycbcr.Y[yi] = p.Pix[off+0]
+				ycbcr.Cb[ci] = p.Pix[off+1]
+				ycbcr.Cr[ci] = p.Pix[off+2]
+				off += 3
+			}
+		}
+	default:
+		// Default to 4:4:4 subsampling.
+		for y := ycbcr.Rect.Min.Y; y < ycbcr.Rect.Max.Y; y++ {
+			yy := (y - ycbcr.Rect.Min.Y) * ycbcr.YStride
+			cy := (y - ycbcr.Rect.Min.Y) * ycbcr.CStride
+			for x := ycbcr.Rect.Min.X; x < ycbcr.Rect.Max.X; x++ {
+				xx := (x - ycbcr.Rect.Min.X)
+				yi := yy + xx
+				ci := cy + xx
+				ycbcr.Y[yi] = p.Pix[off+0]
+				ycbcr.Cb[ci] = p.Pix[off+1]
+				ycbcr.Cr[ci] = p.Pix[off+2]
+				off += 3
+			}
+		}
+	}
+	return ycbcr
+}
+
+// imageYCbCrToYCC converts a YCbCr image to a ycc image for resizing.
+func imageYCbCrToYCC(in *image.YCbCr) *ycc {
+	w, h := in.Rect.Dx(), in.Rect.Dy()
+	r := image.Rect(0, 0, w, h)
+	buf := make([]uint8, 3*w*h)
+	p := ycc{Pix: buf, Stride: 3 * w, Rect: r, SubsampleRatio: in.SubsampleRatio}
+	var off int
+
+	switch in.SubsampleRatio {
+	case image.YCbCrSubsampleRatio422:
+		for y := in.Rect.Min.Y; y < in.Rect.Max.Y; y++ {
+			yy := (y - in.Rect.Min.Y) * in.YStride
+			cy := (y - in.Rect.Min.Y) * in.CStride
+			for x := in.Rect.Min.X; x < in.Rect.Max.X; x++ {
+				xx := (x - in.Rect.Min.X)
+				yi := yy + xx
+				ci := cy + xx/2
+				p.Pix[off+0] = in.Y[yi]
+				p.Pix[off+1] = in.Cb[ci]
+				p.Pix[off+2] = in.Cr[ci]
+				off += 3
+			}
+		}
+	case image.YCbCrSubsampleRatio420:
+		for y := in.Rect.Min.Y; y < in.Rect.Max.Y; y++ {
+			yy := (y - in.Rect.Min.Y) * in.YStride
+			cy := (y/2 - in.Rect.Min.Y/2) * in.CStride
+			for x := in.Rect.Min.X; x < in.Rect.Max.X; x++ {
+				xx := (x - in.Rect.Min.X)
+				yi := yy + xx
+				ci := cy + xx/2
+				p.Pix[off+0] = in.Y[yi]
+				p.Pix[off+1] = in.Cb[ci]
+				p.Pix[off+2] = in.Cr[ci]
+				off += 3
+			}
+		}
+	case image.YCbCrSubsampleRatio440:
+		for y := in.Rect.Min.Y; y < in.Rect.Max.Y; y++ {
+			yy := (y - in.Rect.Min.Y) * in.YStride
+			cy := (y/2 - in.Rect.Min.Y/2) * in.CStride
+			for x := in.Rect.Min.X; x < in.Rect.Max.X; x++ {
+				xx := (x - in.Rect.Min.X)
+				yi := yy + xx
+				ci := cy + xx
+				p.Pix[off+0] = in.Y[yi]
+				p.Pix[off+1] = in.Cb[ci]
+				p.Pix[off+2] = in.Cr[ci]
+				off += 3
+			}
+		}
+	default:
+		// Default to 4:4:4 subsampling.
+		for y := in.Rect.Min.Y; y < in.Rect.Max.Y; y++ {
+			yy := (y - in.Rect.Min.Y) * in.YStride
+			cy := (y - in.Rect.Min.Y) * in.CStride
+			for x := in.Rect.Min.X; x < in.Rect.Max.X; x++ {
+				xx := (x - in.Rect.Min.X)
+				yi := yy + xx
+				ci := cy + xx
+				p.Pix[off+0] = in.Y[yi]
+				p.Pix[off+1] = in.Cb[ci]
+				p.Pix[off+2] = in.Cr[ci]
+				off += 3
+			}
+		}
+	}
+	return &p
+}

vendor/src/github.com/nfnt/resize/ycc_test.go

@@ -0,0 +1,214 @@
+/*
+Copyright (c) 2014, Charlie Vieth <charlie.vieth@gmail.com>
+
+Permission to use, copy, modify, and/or distribute this software for any purpose
+with or without fee is hereby granted, provided that the above copyright notice
+and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
+OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
+THIS SOFTWARE.
+*/
+
+package resize
+
+import (
+	"image"
+	"image/color"
+	"testing"
+)
+
+type Image interface {
+	image.Image
+	SubImage(image.Rectangle) image.Image
+}
+
+func TestImage(t *testing.T) {
+	testImage := []Image{
+		newYCC(image.Rect(0, 0, 10, 10), image.YCbCrSubsampleRatio420),
+		newYCC(image.Rect(0, 0, 10, 10), image.YCbCrSubsampleRatio422),
+		newYCC(image.Rect(0, 0, 10, 10), image.YCbCrSubsampleRatio440),
+		newYCC(image.Rect(0, 0, 10, 10), image.YCbCrSubsampleRatio444),
+	}
+	for _, m := range testImage {
+		if !image.Rect(0, 0, 10, 10).Eq(m.Bounds()) {
+			t.Errorf("%T: want bounds %v, got %v",
+				m, image.Rect(0, 0, 10, 10), m.Bounds())
+			continue
+		}
+		m = m.SubImage(image.Rect(3, 2, 9, 8)).(Image)
+		if !image.Rect(3, 2, 9, 8).Eq(m.Bounds()) {
+			t.Errorf("%T: sub-image want bounds %v, got %v",
+				m, image.Rect(3, 2, 9, 8), m.Bounds())
+			continue
+		}
+		// Test that taking an empty sub-image starting at a corner does not panic.
+		m.SubImage(image.Rect(0, 0, 0, 0))
+		m.SubImage(image.Rect(10, 0, 10, 0))
+		m.SubImage(image.Rect(0, 10, 0, 10))
+		m.SubImage(image.Rect(10, 10, 10, 10))
+	}
+}
+
+func TestConvertYCbCr(t *testing.T) {
+	testImage := []Image{
+		image.NewYCbCr(image.Rect(0, 0, 50, 50), image.YCbCrSubsampleRatio420),
+		image.NewYCbCr(image.Rect(0, 0, 50, 50), image.YCbCrSubsampleRatio422),
+		image.NewYCbCr(image.Rect(0, 0, 50, 50), image.YCbCrSubsampleRatio440),
+		image.NewYCbCr(image.Rect(0, 0, 50, 50), image.YCbCrSubsampleRatio444),
+	}
+
+	for _, img := range testImage {
+		m := img.(*image.YCbCr)
+		for y := m.Rect.Min.Y; y < m.Rect.Max.Y; y++ {
+			for x := m.Rect.Min.X; x < m.Rect.Max.X; x++ {
+				yi := m.YOffset(x, y)
+				ci := m.COffset(x, y)
+				m.Y[yi] = uint8(16*y + x)
+				m.Cb[ci] = uint8(y + 16*x)
+				m.Cr[ci] = uint8(y + 16*x)
+			}
+		}
+
+		// test conversion from YCbCr to ycc
+		yc := imageYCbCrToYCC(m)
+		for y := m.Rect.Min.Y; y < m.Rect.Max.Y; y++ {
+			for x := m.Rect.Min.X; x < m.Rect.Max.X; x++ {
+				ystride := 3 * (m.Rect.Max.X - m.Rect.Min.X)
+				xstride := 3
+				yi := m.YOffset(x, y)
+				ci := m.COffset(x, y)
+				si := (y * ystride) + (x * xstride)
+				if m.Y[yi] != yc.Pix[si] {
+					t.Errorf("Err Y - found: %d expected: %d x: %d y: %d yi: %d si: %d",
+						m.Y[yi], yc.Pix[si], x, y, yi, si)
+				}
+				if m.Cb[ci] != yc.Pix[si+1] {
+					t.Errorf("Err Cb - found: %d expected: %d x: %d y: %d ci: %d si: %d",
+						m.Cb[ci], yc.Pix[si+1], x, y, ci, si+1)
+				}
+				if m.Cr[ci] != yc.Pix[si+2] {
+					t.Errorf("Err Cr - found: %d expected: %d x: %d y: %d ci: %d si: %d",
+						m.Cr[ci], yc.Pix[si+2], x, y, ci, si+2)
+				}
+			}
+		}
+
+		// test conversion from ycc back to YCbCr
+		ym := yc.YCbCr()
+		for y := m.Rect.Min.Y; y < m.Rect.Max.Y; y++ {
+			for x := m.Rect.Min.X; x < m.Rect.Max.X; x++ {
+				yi := m.YOffset(x, y)
+				ci := m.COffset(x, y)
+				if m.Y[yi] != ym.Y[yi] {
+					t.Errorf("Err Y - found: %d expected: %d x: %d y: %d yi: %d",
+						m.Y[yi], ym.Y[yi], x, y, yi)
+				}
+				if m.Cb[ci] != ym.Cb[ci] {
+					t.Errorf("Err Cb - found: %d expected: %d x: %d y: %d ci: %d",
+						m.Cb[ci], ym.Cb[ci], x, y, ci)
+				}
+				if m.Cr[ci] != ym.Cr[ci] {
+					t.Errorf("Err Cr - found: %d expected: %d x: %d y: %d ci: %d",
+						m.Cr[ci], ym.Cr[ci], x, y, ci)
+				}
+			}
+		}
+	}
+}
+
+func TestYCbCr(t *testing.T) {
+	rects := []image.Rectangle{
+		image.Rect(0, 0, 16, 16),
+		image.Rect(1, 0, 16, 16),
+		image.Rect(0, 1, 16, 16),
+		image.Rect(1, 1, 16, 16),
+		image.Rect(1, 1, 15, 16),
+		image.Rect(1, 1, 16, 15),
+		image.Rect(1, 1, 15, 15),
+		image.Rect(2, 3, 14, 15),
+		image.Rect(7, 0, 7, 16),
+		image.Rect(0, 8, 16, 8),
+		image.Rect(0, 0, 10, 11),
+		image.Rect(5, 6, 16, 16),
+		image.Rect(7, 7, 8, 8),
+		image.Rect(7, 8, 8, 9),
+		image.Rect(8, 7, 9, 8),
+		image.Rect(8, 8, 9, 9),
+		image.Rect(7, 7, 17, 17),
+		image.Rect(8, 8, 17, 17),
+		image.Rect(9, 9, 17, 17),
+		image.Rect(10, 10, 17, 17),
+	}
+	subsampleRatios := []image.YCbCrSubsampleRatio{
+		image.YCbCrSubsampleRatio444,
+		image.YCbCrSubsampleRatio422,
+		image.YCbCrSubsampleRatio420,
+		image.YCbCrSubsampleRatio440,
+	}
+	deltas := []image.Point{
+		image.Pt(0, 0),
+		image.Pt(1000, 1001),
+		image.Pt(5001, -400),
+		image.Pt(-701, -801),
+	}
+	for _, r := range rects {
+		for _, subsampleRatio := range subsampleRatios {
+			for _, delta := range deltas {
+				testYCbCr(t, r, subsampleRatio, delta)
+			}
+		}
+		if testing.Short() {
+			break
+		}
+	}
+}
+
+func testYCbCr(t *testing.T, r image.Rectangle, subsampleRatio image.YCbCrSubsampleRatio, delta image.Point) {
+	// Create a YCbCr image m, whose bounds are r translated by (delta.X, delta.Y).
+	r1 := r.Add(delta)
+	img := image.NewYCbCr(r1, subsampleRatio)
+
+	// Initialize img's pixels. For 422 and 420 subsampling, some of the Cb and Cr elements
+	// will be set multiple times. That's OK. We just want to avoid a uniform image.
+	for y := r1.Min.Y; y < r1.Max.Y; y++ {
+		for x := r1.Min.X; x < r1.Max.X; x++ {
+			yi := img.YOffset(x, y)
+			ci := img.COffset(x, y)
+			img.Y[yi] = uint8(16*y + x)
+			img.Cb[ci] = uint8(y + 16*x)
+			img.Cr[ci] = uint8(y + 16*x)
+		}
+	}
+
+	m := imageYCbCrToYCC(img)
+
+	// Make various sub-images of m.
+	for y0 := delta.Y + 3; y0 < delta.Y+7; y0++ {
+		for y1 := delta.Y + 8; y1 < delta.Y+13; y1++ {
+			for x0 := delta.X + 3; x0 < delta.X+7; x0++ {
+				for x1 := delta.X + 8; x1 < delta.X+13; x1++ {
+					subRect := image.Rect(x0, y0, x1, y1)
+					sub := m.SubImage(subRect).(*ycc)
+
+					// For each point in the sub-image's bounds, check that m.At(x, y) equals sub.At(x, y).
+					for y := sub.Rect.Min.Y; y < sub.Rect.Max.Y; y++ {
+						for x := sub.Rect.Min.X; x < sub.Rect.Max.X; x++ {
+							color0 := m.At(x, y).(color.YCbCr)
+							color1 := sub.At(x, y).(color.YCbCr)
+							if color0 != color1 {
+								t.Errorf("r=%v, subsampleRatio=%v, delta=%v, x=%d, y=%d, color0=%v, color1=%v",
+									r, subsampleRatio, delta, x, y, color0, color1)
+								return
+							}
+						}
+					}
+				}
+			}
+		}
+	}
+}

vendor/src/github.com/tj/go-debug/History.md

@@ -0,0 +1,21 @@
+
+v2.0.0 / 2014-10-22
+==================
+
+ * remove live toggling feature. Closes #10
+
+1.1.1 / 2014-07-07
+==================
+
+ * fix: dispose socket. Closes #1
+
+1.1.0 / 2014-06-29
+==================
+
+ * add unix domain socket live debugging support
+ * add support for enabling/disabling at runtime
+
+0.1.0 / 2014-05-24
+==================
+
+ * add global and debug relative deltas

vendor/src/github.com/tj/go-debug/Makefile

@@ -0,0 +1,8 @@
+
+test:
+	@go test
+
+bench:
+	@go test -bench=.
+
+.PHONY: bench test

vendor/src/github.com/tj/go-debug/Readme.md

@@ -0,0 +1,75 @@
+
+# go-debug
+
+ Conditional debug logging for Go libraries.
+
+ View the [docs](http://godoc.org/github.com/tj/go-debug).
+
+## Installation
+
+```
+$ go get github.com/tj/go-debug
+```
+
+## Example
+
+```go
+package main
+
+import . "github.com/tj/go-debug"
+import "time"
+
+var debug = Debug("single")
+
+func main() {
+  for {
+    debug("sending mail")
+    debug("send email to %s", "tobi@segment.io")
+    debug("send email to %s", "loki@segment.io")
+    debug("send email to %s", "jane@segment.io")
+    time.Sleep(500 * time.Millisecond)
+  }
+}
+```
+
+If you run the program with the `DEBUG=*` environment variable you will see:
+
+```
+15:58:15.115 34us   33us   single - sending mail
+15:58:15.116 3us    3us    single - send email to tobi@segment.io
+15:58:15.116 1us    1us    single - send email to loki@segment.io
+15:58:15.116 1us    1us    single - send email to jane@segment.io
+15:58:15.620 504ms  504ms  single - sending mail
+15:58:15.620 6us    6us    single - send email to tobi@segment.io
+15:58:15.620 4us    4us    single - send email to loki@segment.io
+15:58:15.620 4us    4us    single - send email to jane@segment.io
+15:58:16.123 503ms  503ms  single - sending mail
+15:58:16.123 7us    7us    single - send email to tobi@segment.io
+15:58:16.123 4us    4us    single - send email to loki@segment.io
+15:58:16.123 4us    4us    single - send email to jane@segment.io
+15:58:16.625 501ms  501ms  single - sending mail
+15:58:16.625 4us    4us    single - send email to tobi@segment.io
+15:58:16.625 4us    4us    single - send email to loki@segment.io
+15:58:16.625 5us    5us    single - send email to jane@segment.io
+```
+
+A timestamp and two deltas are displayed. The timestamp consists of hour, minute, second and microseconds. The left-most delta is relative to the previous debug call of any name, followed by a delta specific to that debug function. These may be useful to identify timing issues and potential bottlenecks.
+
+## The DEBUG environment variable
+
+ Executables often support `--verbose` flags for conditional logging, however
+ libraries typically either require altering your code to enable logging,
+ or simply omit logging all together. go-debug allows conditional logging
+ to be enabled via the __DEBUG__ environment variable, where one or more
+ patterns may be specified.
+
+ For example suppose your application has several models and you want
+ to output logs for users only, you might use `DEBUG=models:user`. In contrast
+ if you wanted to see what all database activity was you might use `DEBUG=models:*`,
+ or if you're love being swamped with logs: `DEBUG=*`. You may also specify a list of names delimited by a comma, for example `DEBUG=mongo,redis:*`.
+
+ The name given _should_ be the package name, however you can use whatever you like.
+
+# License
+
+MIT

vendor/src/github.com/tj/go-debug/debug.go

@@ -0,0 +1,128 @@
+package debug
+
+import (
+	"fmt"
+	"io"
+	"math/rand"
+	"os"
+	"regexp"
+	"strconv"
+	"strings"
+	"sync"
+	"time"
+)
+
+var (
+	writer  io.Writer = os.Stderr
+	reg     *regexp.Regexp
+	m       sync.Mutex
+	enabled = false
+)
+
+// Debugger function.
+type DebugFunction func(string, ...interface{})
+
+// Terminal colors used at random.
+var colors []string = []string{
+	"31",
+	"32",
+	"33",
+	"34",
+	"35",
+	"36",
+}
+
+// Initialize with DEBUG environment variable.
+func init() {
+	env := os.Getenv("DEBUG")
+
+	if "" != env {
+		Enable(env)
+	}
+}
+
+// SetWriter replaces the default of os.Stderr with `w`.
+func SetWriter(w io.Writer) {
+	m.Lock()
+	defer m.Unlock()
+	writer = w
+}
+
+// Disable all pattern matching. This function is thread-safe.
+func Disable() {
+	m.Lock()
+	defer m.Unlock()
+	enabled = false
+}
+
+// Enable the given debug `pattern`. Patterns take a glob-like form,
+// for example if you wanted to enable everything, just use "*", or
+// if you had a library named mongodb you could use "mongodb:connection",
+// or "mongodb:*". Multiple matches can be made with a comma, for
+// example "mongo*,redis*".
+//
+// This function is thread-safe.
+func Enable(pattern string) {
+	m.Lock()
+	defer m.Unlock()
+	pattern = regexp.QuoteMeta(pattern)
+	pattern = strings.Replace(pattern, "\\*", ".*?", -1)
+	pattern = strings.Replace(pattern, ",", "|", -1)
+	pattern = "^(" + pattern + ")$"
+	reg = regexp.MustCompile(pattern)
+	enabled = true
+}
+
+// Debug creates a debug function for `name` which you call
+// with printf-style arguments in your application or library.
+func Debug(name string) DebugFunction {
+	prevGlobal := time.Now()
+	color := colors[rand.Intn(len(colors))]
+	prev := time.Now()
+
+	return func(format string, args ...interface{}) {
+		if !enabled {
+			return
+		}
+
+		if !reg.MatchString(name) {
+			return
+		}
+
+		d := deltas(prevGlobal, prev, color)
+		fmt.Fprintf(writer, d+" \033["+color+"m"+name+"\033[0m - "+format+"\n", args...)
+		prevGlobal = time.Now()
+		prev = time.Now()
+	}
+}
+
+// Return formatting for deltas.
+func deltas(prevGlobal, prev time.Time, color string) string {
+	now := time.Now()
+	global := now.Sub(prevGlobal).Nanoseconds()
+	delta := now.Sub(prev).Nanoseconds()
+	ts := now.UTC().Format("15:04:05.000")
+	deltas := fmt.Sprintf("%s %-6s \033["+color+"m%-6s", ts, humanizeNano(global), humanizeNano(delta))
+	return deltas
+}
+
+// Humanize nanoseconds to a string.
+func humanizeNano(n int64) string {
+	var suffix string
+
+	switch {
+	case n > 1e9:
+		n /= 1e9
+		suffix = "s"
+	case n > 1e6:
+		n /= 1e6
+		suffix = "ms"
+	case n > 1e3:
+		n /= 1e3
+		suffix = "us"
+	default:
+		suffix = "ns"
+	}
+
+	return strconv.Itoa(int(n)) + suffix
+}

vendor/src/github.com/tj/go-debug/debug_test.go

@@ -0,0 +1,152 @@
+package debug
+
+import "testing"
+import "strings"
+import "bytes"
+import "time"
+
+func assertContains(t *testing.T, str, substr string) {
+	if !strings.Contains(str, substr) {
+		t.Fatalf("expected %q to contain %q", str, substr)
+	}
+}
+
+func assertNotContains(t *testing.T, str, substr string) {
+	if strings.Contains(str, substr) {
+		t.Fatalf("expected %q to not contain %q", str, substr)
+	}
+}
+
+func TestDefault(t *testing.T) {
+	var b []byte
+	buf := bytes.NewBuffer(b)
+	SetWriter(buf)
+
+	debug := Debug("foo")
+	debug("something")
+	debug("here")
+	debug("whoop")
+
+	if buf.Len() != 0 {
+		t.Fatalf("buffer should be empty")
+	}
+}
+
+func TestEnable(t *testing.T) {
+	var b []byte
+	buf := bytes.NewBuffer(b)
+	SetWriter(buf)
+
+	Enable("foo")
+
+	debug := Debug("foo")
+	debug("something")
+	debug("here")
+	debug("whoop")
+
+	if buf.Len() == 0 {
+		t.Fatalf("buffer should have output")
+	}
+
+	str := string(buf.Bytes())
+	assertContains(t, str, "something")
+	assertContains(t, str, "here")
+	assertContains(t, str, "whoop")
+}
+
+func TestMultipleOneEnabled(t *testing.T) {
+	var b []byte
+	buf := bytes.NewBuffer(b)
+	SetWriter(buf)
+
+	Enable("foo")
+
+	foo := Debug("foo")
+	foo("foo")
+
+	bar := Debug("bar")
+	bar("bar")
+
+	if buf.Len() == 0 {
+		t.Fatalf("buffer should have output")
+	}
+
+	str := string(buf.Bytes())
+	assertContains(t, str, "foo")
+	assertNotContains(t, str, "bar")
+}
+
+func TestMultipleEnabled(t *testing.T) {
+	var b []byte
+	buf := bytes.NewBuffer(b)
+	SetWriter(buf)
+
+	Enable("foo,bar")
+
+	foo := Debug("foo")
+	foo("foo")
+
+	bar := Debug("bar")
+	bar("bar")
+
+	if buf.Len() == 0 {
+		t.Fatalf("buffer should have output")
+	}
+
+	str := string(buf.Bytes())
+	assertContains(t, str, "foo")
+	assertContains(t, str, "bar")
+}
+
+func TestEnableDisable(t *testing.T) {
+	var b []byte
+	buf := bytes.NewBuffer(b)
+	SetWriter(buf)
+
+	Enable("foo,bar")
+	Disable()
+
+	foo := Debug("foo")
+	foo("foo")
+
+	bar := Debug("bar")
+	bar("bar")
+
+	if buf.Len() != 0 {
+		t.Fatalf("buffer should not have output")
+	}
+}
+
+func ExampleEnable() {
+	Enable("mongo:connection")
+	Enable("mongo:*")
+	Enable("foo,bar,baz")
+	Enable("*")
+}
+
+func ExampleDebug() {
+	var debug = Debug("single")
+
+	for {
+		debug("sending mail")
+		debug("send email to %s", "tobi@segment.io")
+		debug("send email to %s", "loki@segment.io")
+		debug("send email to %s", "jane@segment.io")
+		time.Sleep(500 * time.Millisecond)
+	}
+}
+
+func BenchmarkDisabled(b *testing.B) {
+	debug := Debug("something")
+	for i := 0; i < b.N; i++ {
+		debug("stuff")
+	}
+}
+
+func BenchmarkNonMatch(b *testing.B) {
+	debug := Debug("something")
+	Enable("nonmatch")
+	for i := 0; i < b.N; i++ {
+		debug("stuff")
+	}
+}

vendor/src/github.com/tj/go-debug/example/multiple.go

@@ -0,0 +1,25 @@
+package main
+
+import . "github.com/visionmedia/go-debug"
+import "time"
+
+var a = Debug("multiple:a")
+var b = Debug("multiple:b")
+var c = Debug("multiple:c")
+
+func work(debug DebugFunction, delay time.Duration) {
+	for {
+		debug("doing stuff")
+		time.Sleep(delay)
+	}
+}
+
+func main() {
+	q := make(chan bool)
+
+	go work(a, 1000*time.Millisecond)
+	go work(b, 250*time.Millisecond)
+	go work(c, 100*time.Millisecond)
+
+	<-q
+}

vendor/src/github.com/tj/go-debug/example/single.go

@@ -0,0 +1,16 @@
+package main
+
+import . "github.com/visionmedia/go-debug"
+import "time"
+
+var debug = Debug("single")
+
+func main() {
+	for {
+		debug("sending mail")
+		debug("send email to %s", "tobi@segment.io")
+		debug("send email to %s", "loki@segment.io")
+		debug("send email to %s", "jane@segment.io")
+		time.Sleep(500 * time.Millisecond)
+	}
+}

vendor/src/gopkg.in/h2non/bimg.v1/History.md

@@ -0,0 +1,85 @@
+
+## v1.0.9 / 2017-05-25
+
+  * Merge pull request #156 from Dynom/SmartCropToGravity
+  * Adding a test, verifying both ways of enabling SmartCrop work
+  * Merge pull request #149 from waldophotos/master
+  * Replacing SmartCrop with a Gravity option
+  * refactor(docs): v8.4
+  * Change for older LIBVIPS versions. `vips_bandjoin_const1` is added in libvips 8.2.
+  * Second try, watermarking memory issue fix
+
+## v1.0.8 / 2017-05-18
+
+  * Merge pull request #145 from greut/smartcrop
+  * Merge pull request #155 from greut/libvips8.5.5
+  * Update libvips to 8.5.5.
+  * Adding basic smartcrop support.
+  * Merge pull request #153 from abracadaber/master
+  * Added Linux Mint 17.3+ distro names
+  * feat(docs): add new maintainer notice (thanks to @kirillDanshin)
+  * Merge pull request #152 from greut/libvips85
+  * Download latest version of libvips from github.
+  * Merge pull request #147 from h2non/revert-143-master
+  * Revert "Fix for memory issue when watermarking images"
+  * Merge pull request #146 from greut/minor-major
+  * Merge pull request #143 from waldophotos/master
+  * Merge pull request #144 from greut/go18
+  * Fix tests where minor/major were mixed up
+  * Enabled go 1.8 builds.
+  * Fix the unref of images, when image isn't transparent
+  * Fix for memory issue when watermarking images
+  * feat(docs): add maintainers sections
+  * Merge pull request #132 from jaume-pinyol/WATERMARK_SUPPORT
+  * Add support for image watermarks
+  * Merge pull request #131 from greut/versions
+  * Running tests on more specific versions.
+  * refactor(preinstall.sh): remove deprecation notice
+  * Update preinstall.sh
+  * fix(requirements): required libvips 7.42
+  * fix(History): typo
+  * chore(History): add breaking change note
+
+## v1.0.7 / 13-01-2017
+
+- fix(#128): crop image calculation for missing width or height axis.
+- feat: add TIFF save output format (**note**: this introduces a minor interface breaking change in `bimg.IsImageTypeSupportedByVips` auxiliary function).
+
+## v1.0.6 / 12-11-2016
+
+- feat(#118): handle 16-bit PNGs.
+- feat(#119): adds JPEG2000 file for the type tests.
+- feat(#121): test bimg against multiple libvips versions.
+
+## v1.0.5 / 01-10-2016
+
+- feat(#92): support Extend param with optional background.
+- fix(#106): allow image area extraction without explicit x/y axis.
+- feat(api): add Extend type with `libvips` enum alias.
+
+## v1.0.4 / 29-09-2016
+
+- fix(#111): safe check of magick image type support.
+
+## v1.0.3 / 28-09-2016
+
+- fix(#95): better image type inference and support check.
+- fix(background): pass proper background RGB color for PNG image conversion.
+- feat(types): validate supported image types by current `libvips` compilation.
+- feat(types): consistent SVG image checking.
+- feat(api): add public functions `VipsIsTypeSupported()`, `IsImageTypeSupportedByVips()` and `IsSVGImage()`.
+
+## v1.0.2 / 27-09-2016
+
+- feat(#95): support GIF, SVG and PDF formats.
+- fix(#108): auto-width and height calculations now round instead of floor.
+
+## v1.0.1 / 22-06-2016
+
+- fix(#90): Do not not dereference the original image a second time.
+
+## v1.0.0 / 21-04-2016
+
+- refactor(api): breaking changes: normalize public members to follow Go naming idioms.
+- feat(version): bump to major version. API contract won't be compromised in `v1`.
+- feat(docs): add missing inline godoc documentation.

vendor/src/gopkg.in/h2non/bimg.v1/LICENSE

@@ -0,0 +1,24 @@
+The MIT License
+
+Copyright (c) Tomas Aparicio and contributors
+
+Permission is hereby granted, free of charge, to any person
+obtaining a copy of this software and associated documentation
+files (the "Software"), to deal in the Software without
+restriction, including without limitation the rights to use,
+copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the
+Software is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.

vendor/src/gopkg.in/h2non/bimg.v1/README.md

@@ -0,0 +1,347 @@
+# bimg [![Build Status](https://travis-ci.org/h2non/bimg.svg)](https://travis-ci.org/h2non/bimg) [![GoDoc](https://godoc.org/github.com/h2non/bimg?status.svg)](https://godoc.org/github.com/h2non/bimg) [![Go Report Card](http://goreportcard.com/badge/h2non/bimg)](http://goreportcard.com/report/h2non/bimg) [![Coverage Status](https://coveralls.io/repos/github/h2non/bimg/badge.svg?branch=master)](https://coveralls.io/github/h2non/bimg?branch=master) ![License](https://img.shields.io/badge/license-MIT-blue.svg)
+
+Small [Go](http://golang.org) package for fast high-level image processing using [libvips](https://github.com/jcupitt/libvips) via C bindings, providing a simple, elegant and fluent [programmatic API](#examples).
+
+bimg was designed to be a small and efficient library supporting a common set of [image operations](#supported-image-operations) such as crop, resize, rotate, zoom or watermark. It can read JPEG, PNG, WEBP natively, and optionally TIFF, PDF, GIF and SVG formats if `libvips@8.3+` is compiled with proper library bindings.
+
+bimg is able to output images as JPEG, PNG and WEBP formats, including transparent conversion across them.
+
+bimg uses internally libvips, a powerful library written in C for image processing which requires a [low memory footprint](http://www.vips.ecs.soton.ac.uk/index.php?title=Speed_and_Memory_Use)
+and it's typically 4x faster than using the quickest ImageMagick and GraphicsMagick settings or Go native `image` package, and in some cases it's even 8x faster processing JPEG images.
+
+If you're looking for an HTTP based image processing solution, see [imaginary](https://github.com/h2non/imaginary).
+
+bimg was heavily inspired in [sharp](https://github.com/lovell/sharp), its homologous package built for [node.js](http://nodejs.org). bimg is used in production environments processing thousands of images per day.
+
+**v1 notice**: `bimg` introduces some minor breaking changes in `v1` release.
+If you're using `gopkg.in`, you can still rely in the `v0` without worrying about API breaking changes.
+
+`bimg` is currently maintained by [Kirill Danshin](https://github.com/kirillDanshin).
+
+## Contents
+
+- [Supported image operations](#supported-image-operations)
+- [Prerequisites](#prerequisites)
+- [Installation](#installation)
+- [Performance](#performance)
+- [Benchmark](#benchmark)
+- [Examples](#examples)
+- [Debugging](#debugging)
+- [API](#api)
+- [Authors](#authors)
+- [Credits](#credits)
+
+## Supported image operations
+
+- Resize
+- Enlarge
+- Crop (including smart crop support)
+- Rotate (with auto-rotate based on EXIF orientation)
+- Flip (with auto-flip based on EXIF metadata)
+- Flop
+- Zoom
+- Thumbnail
+- Extract area
+- Watermark (text only)
+- Gaussian blur effect
+- Custom output color space (RGB, grayscale...)
+- Format conversion (with additional quality/compression settings)
+- EXIF metadata (size, alpha channel, profile, orientation...)
+
+## Prerequisites
+
+- [libvips](https://github.com/jcupitt/libvips) 7.42+ or 8+ (8.4+ recommended)
+- C compatible compiler such as gcc 4.6+ or clang 3.0+
+- Go 1.3+
+
+**Note**: `libvips` v8.3+ is required for GIF, PDF and SVG support.
+
+## Installation
+
+```bash
+go get -u gopkg.in/h2non/bimg.v1
+```
+
+### libvips
+
+Run the following script as `sudo` (supports OSX, Debian/Ubuntu, Redhat, Fedora, Amazon Linux):
+```bash
+curl -s https://raw.githubusercontent.com/h2non/bimg/master/preinstall.sh | sudo bash -
+```
+
+If you wanna take the advantage of [OpenSlide](http://openslide.org/), simply add `--with-openslide` to enable it:
+```bash
+curl -s https://raw.githubusercontent.com/h2non/bimg/master/preinstall.sh | sudo bash -s --with-openslide
+```
+
+The [install script](https://github.com/h2non/bimg/blob/master/preinstall.sh) requires `curl` and `pkg-config`.
+
+## Performance
+
+libvips is probably the faster open source solution for image processing.
+Here you can see some performance test comparisons for multiple scenarios:
+
+- [libvips speed and memory usage](http://www.vips.ecs.soton.ac.uk/index.php?title=Speed_and_Memory_Use)
+
+## Benchmark
+
+Tested using Go 1.5.1 and libvips-7.42.3 in OSX i7 2.7Ghz
+```
+BenchmarkRotateJpeg-8     	      20	  64686945 ns/op
+BenchmarkResizeLargeJpeg-8	      20	  63390416 ns/op
+BenchmarkResizePng-8      	     100	  18147294 ns/op
+BenchmarkResizeWebP-8     	     100	  20836741 ns/op
+BenchmarkConvertToJpeg-8  	     100	  12831812 ns/op
+BenchmarkConvertToPng-8   	      10	 128901422 ns/op
+BenchmarkConvertToWebp-8  	      10	 204027990 ns/op
+BenchmarkCropJpeg-8       	      30	  59068572 ns/op
+BenchmarkCropPng-8        	      10	 117303259 ns/op
+BenchmarkCropWebP-8       	      10	 107060659 ns/op
+BenchmarkExtractJpeg-8    	      50	  30708919 ns/op
+BenchmarkExtractPng-8     	    3000	    595546 ns/op
+BenchmarkExtractWebp-8    	    3000	    386379 ns/op
+BenchmarkZoomJpeg-8       	      10	 160005424 ns/op
+BenchmarkZoomPng-8        	      30	  44561047 ns/op
+BenchmarkZoomWebp-8       	      10	 126732678 ns/op
+BenchmarkWatermarkJpeg-8  	      20	  79006133 ns/op
+BenchmarkWatermarPng-8    	     200	   8197291 ns/op
+BenchmarkWatermarWebp-8   	      30	  49360369 ns/op
+```
+
+## Examples
+
+```go
+import (
+  "fmt"
+  "os"
+  "gopkg.in/h2non/bimg.v1"
+)
+```
+
+#### Resize
+
+```go
+buffer, err := bimg.Read("image.jpg")
+if err != nil {
+  fmt.Fprintln(os.Stderr, err)
+}
+
+newImage, err := bimg.NewImage(buffer).Resize(800, 600)
+if err != nil {
+  fmt.Fprintln(os.Stderr, err)
+}
+
+size, err := bimg.NewImage(newImage).Size()
+if size.Width == 400 && size.Height == 300 {
+  fmt.Println("The image size is valid")
+}
+
+bimg.Write("new.jpg", newImage)
+```
+
+#### Rotate
+
+```go
+buffer, err := bimg.Read("image.jpg")
+if err != nil {
+  fmt.Fprintln(os.Stderr, err)
+}
+
+newImage, err := bimg.NewImage(buffer).Rotate(90)
+if err != nil {
+  fmt.Fprintln(os.Stderr, err)
+}
+
+bimg.Write("new.jpg", newImage)
+```
+
+#### Convert
+
+```go
+buffer, err := bimg.Read("image.jpg")
+if err != nil {
+  fmt.Fprintln(os.Stderr, err)
+}
+
+newImage, err := bimg.NewImage(buffer).Convert(bimg.PNG)
+if err != nil {
+  fmt.Fprintln(os.Stderr, err)
+}
+
+if bimg.NewImage(newImage).Type() == "png" {
+  fmt.Fprintln(os.Stderr, "The image was converted into png")
+}
+```
+
+#### Force resize
+
+Force resize operation without perserving the aspect ratio:
+
+```go
+buffer, err := bimg.Read("image.jpg")
+if err != nil {
+  fmt.Fprintln(os.Stderr, err)
+}
+
+newImage, err := bimg.NewImage(buffer).ForceResize(1000, 500)
+if err != nil {
+  fmt.Fprintln(os.Stderr, err)
+}
+
+size := bimg.Size(newImage)
+if size.Width != 1000 || size.Height != 500 {
+  fmt.Fprintln(os.Stderr, "Incorrect image size")
+}
+```
+
+#### Custom colour space (black & white)
+
+```go
+buffer, err := bimg.Read("image.jpg")
+if err != nil {
+  fmt.Fprintln(os.Stderr, err)
+}
+
+newImage, err := bimg.NewImage(buffer).Colourspace(bimg.INTERPRETATION_B_W)
+if err != nil {
+  fmt.Fprintln(os.Stderr, err)
+}
+
+colourSpace, _ := bimg.ImageInterpretation(newImage)
+if colourSpace != bimg.INTERPRETATION_B_W {
+  fmt.Fprintln(os.Stderr, "Invalid colour space")
+}
+```
+
+#### Custom options
+
+See [Options](https://godoc.org/github.com/h2non/bimg#Options) struct to discover all the available fields
+
+```go
+options := bimg.Options{
+  Width:        800,
+  Height:       600,
+  Crop:         true,
+  Quality:      95,
+  Rotate:       180,
+  Interlace:    true,
+}
+
+buffer, err := bimg.Read("image.jpg")
+if err != nil {
+  fmt.Fprintln(os.Stderr, err)
+}
+
+newImage, err := bimg.NewImage(buffer).Process(options)
+if err != nil {
+  fmt.Fprintln(os.Stderr, err)
+}
+
+bimg.Write("new.jpg", newImage)
+```
+
+#### Watermark
+
+```go
+buffer, err := bimg.Read("image.jpg")
+if err != nil {
+  fmt.Fprintln(os.Stderr, err)
+}
+
+watermark := bimg.Watermark{
+  Text:       "Chuck Norris (c) 2315",
+  Opacity:    0.25,
+  Width:      200,
+  DPI:        100,
+  Margin:     150,
+  Font:       "sans bold 12",
+  Background: bimg.Color{255, 255, 255},
+}
+
+newImage, err := bimg.NewImage(buffer).Watermark(watermark)
+if err != nil {
+  fmt.Fprintln(os.Stderr, err)
+}
+
+bimg.Write("new.jpg", newImage)
+```
+
+#### Fluent interface
+
+```go
+buffer, err := bimg.Read("image.jpg")
+if err != nil {
+  fmt.Fprintln(os.Stderr, err)
+}
+
+image := bimg.NewImage(buffer)
+
+// first crop image
+_, err := image.CropByWidth(300)
+if err != nil {
+  fmt.Fprintln(os.Stderr, err)
+}
+
+// then flip it
+newImage, err := image.Flip()
+if err != nil {
+  fmt.Fprintln(os.Stderr, err)
+}
+
+// save the cropped and flipped image
+bimg.Write("new.jpg", newImage)
+```
+
+## Debugging
+
+Run the process passing the `DEBUG` environment variable
+```
+DEBUG=bimg ./app
+```
+
+Enable libvips traces (note that a lot of data will be written in stdout):
+```
+VIPS_TRACE=1 ./app
+```
+
+You can also dump a core on failure, as [John Cuppit](https://github.com/jcupitt) said:
+```c
+g_log_set_always_fatal(
+                G_LOG_FLAG_RECURSION |
+                G_LOG_FLAG_FATAL |
+                G_LOG_LEVEL_ERROR |
+                G_LOG_LEVEL_CRITICAL |
+                G_LOG_LEVEL_WARNING );
+```
+
+Or set the G_DEBUG environment variable:
+```
+export G_DEBUG=fatal-warnings,fatal-criticals
+```
+
+## API
+
+See [godoc reference](https://godoc.org/github.com/h2non/bimg) for detailed API documentation.
+
+## Authors
+
+- [Tomás Aparicio](https://github.com/h2non) - Original author and architect.
+- [Kirill Danshin](https://github.com/kirillDanshin) - Maintainer since April 2017.
+
+## Credits
+
+People who recurrently contributed to improve `bimg` in some way.
+
+- [John Cupitt](https://github.com/jcupitt)
+- [Yoan Blanc](https://github.com/greut)
+- [Christophe Eblé](https://github.com/chreble)
+- [Brant Fitzsimmons](https://github.com/bfitzsimmons)
+- [Thomas Meson](https://github.com/zllak)
+
+Thank you!
+
+## License
+
+MIT - Tomas Aparicio
+
+[![views](https://sourcegraph.com/api/repos/github.com/h2non/bimg/.counters/views.svg)](https://sourcegraph.com/github.com/h2non/bimg)

vendor/src/gopkg.in/h2non/bimg.v1/file.go

@@ -0,0 +1,15 @@
+package bimg
+
+import "io/ioutil"
+
+// Read reads all the content of the given file path
+// and returns it as byte buffer.
+func Read(path string) ([]byte, error) {
+	return ioutil.ReadFile(path)
+}
+
+// Write writes the given byte buffer into disk
+// to the given file path.
+func Write(path string, buf []byte) error {
+	return ioutil.WriteFile(path, buf, 0644)
+}

vendor/src/gopkg.in/h2non/bimg.v1/file_test.go

@@ -0,0 +1,38 @@
+package bimg
+
+import (
+	"testing"
+)
+
+func TestRead(t *testing.T) {
+	buf, err := Read("fixtures/test.jpg")
+
+	if err != nil {
+		t.Errorf("Cannot read the image: %#v", err)
+	}
+
+	if len(buf) == 0 {
+		t.Fatal("Empty buffer")
+	}
+
+	if DetermineImageType(buf) != JPEG {
+		t.Fatal("Image is not jpeg")
+	}
+}
+
+func TestWrite(t *testing.T) {
+	buf, err := Read("fixtures/test.jpg")
+
+	if err != nil {
+		t.Errorf("Cannot read the image: %#v", err)
+	}
+
+	if len(buf) == 0 {
+		t.Fatal("Empty buffer")
+	}
+
+	err = Write("fixtures/test_write_out.jpg", buf)
+	if err != nil {
+		t.Fatalf("Cannot write the file: %#v", err)
+	}
+}

vendor/src/gopkg.in/h2non/bimg.v1/fixtures/test.svg

@@ -0,0 +1,725 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg id="svg2" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 900 900" version="1.1">
+ <g id="g4" fill="none" transform="matrix(1.7656463,0,0,1.7656463,324.90716,255.00942)">
+  <g id="g6" stroke-width="0.17200001" stroke="#000" fill="#FFF">
+   <path id="path8" d="m-122.3,84.285s0.1,1.894-0.73,1.875c-0.82-0.019-17.27-48.094-37.8-45.851,0,0,17.78-7.353,38.53,43.976z"/>
+  </g>
+  <g id="g10" stroke-width="0.17200001" stroke="#000" fill="#FFF">
+   <path id="path12" d="m-118.77,81.262s-0.55,1.816-1.32,1.517c-0.77-0.298,0.11-51.104-19.95-55.978,0,0,19.22-0.864,21.27,54.461z"/>
+  </g>
+  <g id="g14" stroke-width="0.17200001" stroke="#000" fill="#FFF">
+   <path id="path16" d="m-91.284,123.59s1.636,0.96,1.166,1.64c-0.471,0.67-49.642-12.13-59.102,6.23,0,0,3.68-18.89,57.936-7.87z"/>
+  </g>
+  <g id="g18" stroke-width="0.17200001" stroke="#000" fill="#FFF">
+   <path id="path20" d="m-94.093,133.8s1.856,0.4,1.622,1.19c-0.233,0.79-50.939,4.13-54.129,24.53,0,0-2.46-19.08,52.507-25.72z"/>
+  </g>
+  <g id="g22" stroke-width="0.17200001" stroke="#000" fill="#FFF">
+   <path id="path24" d="m-98.304,128.28s1.778,0.66,1.432,1.41-50.998-3.34-57.128,16.37c0,0,0.35-19.24,55.696-17.78z"/>
+  </g>
+  <g id="g26" stroke-width="0.17200001" stroke="#000" fill="#FFF">
+   <path id="path28" d="m-109.01,110.07s1.31,1.38,0.67,1.9-44.38-25.336-58.53-10.29c0,0,8.74-17.147,57.86,8.39z"/>
+  </g>
+  <g id="g30" stroke-width="0.17200001" stroke="#000" fill="#FFF">
+   <path id="path32" d="m-116.55,114.26s1.45,1.22,0.88,1.81c-0.58,0.59-46.97-20.148-59.32-3.6,0,0,6.74-18.023,58.44,1.79z"/>
+  </g>
+  <g id="g34" stroke-width="0.17200001" stroke="#000" fill="#FFF">
+   <path id="path36" d="m-119.15,118.34s1.6,1,1.11,1.67c-0.49,0.66-49.27-13.56-59.25,4.51,0,0,4.22-18.77,58.14-6.18z"/>
+  </g>
+  <g id="g38" stroke-width="0.17200001" stroke="#000" fill="#FFF">
+   <path id="path40" d="m-108.42,118.95s1.12,1.53,0.42,1.97c-0.7,0.43-40.77-30.818-56.73-17.71,0,0,10.87-15.884,56.31,15.74z"/>
+  </g>
+  <g id="g42" stroke-width="0.17200001" stroke="#000" fill="#FFF">
+   <path id="path44" d="m-128.2,90s0.6,1.8-0.2,2-29.4-41.8-48.6-34.2c0,0,15.2-11.8,48.8,32.2z"/>
+  </g>
+  <g id="g46" stroke-width="0.17200001" stroke="#000" fill="#FFF">
+   <path id="path48" d="m-127.5,96.979s0.97,1.629,0.23,1.996c-0.74,0.368-37.72-34.476-54.83-22.914,0,0,12.3-14.8,54.6,20.918z"/>
+  </g>
+  <g id="g50" stroke-width="0.17200001" stroke="#000" fill="#FFF">
+   <path id="path52" d="m-127.62,101.35s1.12,1.53,0.42,1.97c-0.7,0.43-40.77-30.818-56.73-17.713,0,0,10.87-15.881,56.31,15.743z"/>
+  </g>
+  <g id="g54" stroke="#000" fill="#FFF">
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+  </g>
+  <g id="g58" stroke="#000" fill="#cc7226">
+   <path id="path60" d="m299.72,80.245c0.62,0.181,2.83,1.305,4.08,2.955,0,0,6.8,10.8,1.6-7.6,0,0-9.2-28.8-0.4-17.6,0,0,6,7.2,2.8-6.4-3.86-16.427-6.4-22.8-6.4-22.8s11.6,4.8-15.2-34.8l8.8,3.6s-19.6-39.6-41.2-44.8l-8-6s38.4-38,25.6-74.8c0,0-6.8-5.2-16.4,4,0,0-6.4,4.8-12.4,3.2,0,0-30.8,1.2-32.8,1.2s-36.8-37.2-102.4-19.6c0,0-5.2,2-9.599,0.8,0,0-18.401-16-67.201,6.8,0,0-10,2-11.6,2s-4.4,0-12.4,6.4-8.4,7.2-10.4,8.8c0,0-16.4,11.2-21.2,12,0,0-11.6,6.4-16,16.4l-3.6,1.2s-1.6,7.2-2,8.4c0,0-4.8,3.6-5.6,9.2,0,0-8.8,6-8.4,10.4,0,0-1.6,5.2-2.4,10,0,0-7.2,4.8-6.4,7.6,0,0-7.6,14-6.4,20.8,0,0-6.4-0.4-9.2,2,0,0-0.8,4.8-2.4,5.2,0,0-2.8,1.2-0.4,5.2,0,0-1.6,2.8-2,4.4,0,0,0.8,2.8-3.6,8.4,0,0-6.4,18.8-4.4,24,0,0,0.4,4.8-2.4,6.4,0,0-3.6-0.4,4.8,11.6,0,0,0.8,1.2-2.4,3.6,0,0-17.2,3.6-19.6,20,0,0-13.6,14.8-13.6,20,0,2.305,0.27,5.452,0.97,10.06,0,0-0.57,8.34,27.03,9.14s402.72-31.355,402.72-31.355z"/>
+  </g>
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+  </g>
+  <g id="g78" fill="#eea575">
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+  </g>
+  <g id="g82" fill="#f1b288">
+   <path id="path84" d="m138.75,32.328c-6.4,0.8-32.37-22.651-16.8,8.8,19.2,38.8-58.404,39.2-75.204,28s7.2,18.4,7.2,18.4c18.4,20.002-16,3.2-16,3.2-34.4-12.8-58.4,12.802-61.6,13.602s-8,4-8.8-2.4c-0.8-6.402-7.654-22.265-40,3.2-26.182,20.33-38.436,1.05-38.436,1.05l-4.8,4.15c-18-33.202-7.24,24.54-7.24,24.54,8.8,34.4,141.68-9.74,141.68-9.74s168.8-30.402,180-34.402,102.03,2.036,102.03,2.036l-5.23-19.345c-64.8-46.4-80-20.291-93.6-24.291s-11.2,5.6-14.4,6.4-42.4-24-48.8-23.2z"/>
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+   <path id="path960" d="m-33.5,336s2-6.5-4.5-2"/>
+  </g>
+  <g id="g962" stroke="#000">
+   <path id="path964" d="m20.5,344.5s1.5-11-10,2"/>
+  </g>
+ </g>
+</svg>

vendor/src/gopkg.in/h2non/bimg.v1/image.go

@@ -0,0 +1,223 @@
+package bimg
+
+// Image provides a simple method DSL to transform a given image as byte buffer.
+type Image struct {
+	buffer []byte
+}
+
+// NewImage creates a new Image struct with method DSL.
+func NewImage(buf []byte) *Image {
+	return &Image{buf}
+}
+
+// Resize resizes the image to fixed width and height.
+func (i *Image) Resize(width, height int) ([]byte, error) {
+	options := Options{
+		Width:  width,
+		Height: height,
+		Embed:  true,
+	}
+	return i.Process(options)
+}
+
+// ForceResize resizes with custom size (aspect ratio won't be maintained).
+func (i *Image) ForceResize(width, height int) ([]byte, error) {
+	options := Options{
+		Width:  width,
+		Height: height,
+		Force:  true,
+	}
+	return i.Process(options)
+}
+
+// ResizeAndCrop resizes the image to fixed width and height with additional crop transformation.
+func (i *Image) ResizeAndCrop(width, height int) ([]byte, error) {
+	options := Options{
+		Width:  width,
+		Height: height,
+		Embed:  true,
+		Crop:   true,
+	}
+	return i.Process(options)
+}
+
+// SmartCrop produces a thumbnail aiming at focus on the interesting part.
+func (i *Image) SmartCrop(width, height int) ([]byte, error) {
+	options := Options{
+		Width:   width,
+		Height:  height,
+		Crop:    true,
+		Gravity: GravitySmart,
+	}
+	return i.Process(options)
+}
+
+// Extract area from the by X/Y axis in the current image.
+func (i *Image) Extract(top, left, width, height int) ([]byte, error) {
+	options := Options{
+		Top:        top,
+		Left:       left,
+		AreaWidth:  width,
+		AreaHeight: height,
+	}
+
+	if top == 0 && left == 0 {
+		options.Top = -1
+	}
+
+	return i.Process(options)
+}
+
+// Enlarge enlarges the image by width and height. Aspect ratio is maintained.
+func (i *Image) Enlarge(width, height int) ([]byte, error) {
+	options := Options{
+		Width:   width,
+		Height:  height,
+		Enlarge: true,
+	}
+	return i.Process(options)
+}
+
+// EnlargeAndCrop enlarges the image by width and height with additional crop transformation.
+func (i *Image) EnlargeAndCrop(width, height int) ([]byte, error) {
+	options := Options{
+		Width:   width,
+		Height:  height,
+		Enlarge: true,
+		Crop:    true,
+	}
+	return i.Process(options)
+}
+
+// Crop crops the image to the exact size specified.
+func (i *Image) Crop(width, height int, gravity Gravity) ([]byte, error) {
+	options := Options{
+		Width:   width,
+		Height:  height,
+		Gravity: gravity,
+		Crop:    true,
+	}
+	return i.Process(options)
+}
+
+// CropByWidth crops an image by width only param (auto height).
+func (i *Image) CropByWidth(width int) ([]byte, error) {
+	options := Options{
+		Width: width,
+		Crop:  true,
+	}
+	return i.Process(options)
+}
+
+// CropByHeight crops an image by height (auto width).
+func (i *Image) CropByHeight(height int) ([]byte, error) {
+	options := Options{
+		Height: height,
+		Crop:   true,
+	}
+	return i.Process(options)
+}
+
+// Thumbnail creates a thumbnail of the image by the a given width by aspect ratio 4:4.
+func (i *Image) Thumbnail(pixels int) ([]byte, error) {
+	options := Options{
+		Width:   pixels,
+		Height:  pixels,
+		Crop:    true,
+		Quality: 95,
+	}
+	return i.Process(options)
+}
+
+// Watermark adds text as watermark on the given image.
+func (i *Image) Watermark(w Watermark) ([]byte, error) {
+	options := Options{Watermark: w}
+	return i.Process(options)
+}
+
+// WatermarkImage adds image as watermark on the given image.
+func (i *Image) WatermarkImage(w WatermarkImage) ([]byte, error) {
+	options := Options{WatermarkImage: w}
+	return i.Process(options)
+}
+
+// Zoom zooms the image by the given factor.
+// You should probably call Extract() before.
+func (i *Image) Zoom(factor int) ([]byte, error) {
+	options := Options{Zoom: factor}
+	return i.Process(options)
+}
+
+// Rotate rotates the image by given angle degrees (0, 90, 180 or 270).
+func (i *Image) Rotate(a Angle) ([]byte, error) {
+	options := Options{Rotate: a}
+	return i.Process(options)
+}
+
+// Flip flips the image about the vertical Y axis.
+func (i *Image) Flip() ([]byte, error) {
+	options := Options{Flip: true}
+	return i.Process(options)
+}
+
+// Flop flops the image about the horizontal X axis.
+func (i *Image) Flop() ([]byte, error) {
+	options := Options{Flop: true}
+	return i.Process(options)
+}
+
+// Convert converts image to another format.
+func (i *Image) Convert(t ImageType) ([]byte, error) {
+	options := Options{Type: t}
+	return i.Process(options)
+}
+
+// Colourspace performs a color space conversion bsaed on the given interpretation.
+func (i *Image) Colourspace(c Interpretation) ([]byte, error) {
+	options := Options{Interpretation: c}
+	return i.Process(options)
+}
+
+// Process processes the image based on the given transformation options,
+// talking with libvips bindings accordingly and returning the resultant
+// image buffer.
+func (i *Image) Process(o Options) ([]byte, error) {
+	image, err := Resize(i.buffer, o)
+	if err != nil {
+		return nil, err
+	}
+	i.buffer = image
+	return image, nil
+}
+
+// Metadata returns the image metadata (size, alpha channel, profile, EXIF rotation).
+func (i *Image) Metadata() (ImageMetadata, error) {
+	return Metadata(i.buffer)
+}
+
+// Interpretation gets the image interpretation type.
+// See: http://www.vips.ecs.soton.ac.uk/supported/current/doc/html/libvips/VipsImage.html#VipsInterpretation
+func (i *Image) Interpretation() (Interpretation, error) {
+	return ImageInterpretation(i.buffer)
+}
+
+// ColourspaceIsSupported checks if the current image
+// color space is supported.
+func (i *Image) ColourspaceIsSupported() (bool, error) {
+	return ColourspaceIsSupported(i.buffer)
+}
+
+// Type returns the image type format (jpeg, png, webp, tiff).
+func (i *Image) Type() string {
+	return DetermineImageTypeName(i.buffer)
+}
+
+// Size returns the image size as form of width and height pixels.
+func (i *Image) Size() (ImageSize, error) {
+	return Size(i.buffer)
+}
+
+// Image returns the current resultant image image buffer.
+func (i *Image) Image() []byte {
+	return i.buffer
+}

vendor/src/gopkg.in/h2non/bimg.v1/image_test.go

@@ -0,0 +1,496 @@
+package bimg
+
+import (
+	"fmt"
+	"path"
+	"testing"
+)
+
+func TestImageResize(t *testing.T) {
+	buf, err := initImage("test.jpg").Resize(300, 240)
+	if err != nil {
+		t.Errorf("Cannot process the image: %#v", err)
+	}
+
+	err = assertSize(buf, 300, 240)
+	if err != nil {
+		t.Error(err)
+	}
+
+	Write("fixtures/test_resize_out.jpg", buf)
+}
+
+func TestImageGifResize(t *testing.T) {
+	_, err := initImage("test.gif").Resize(300, 240)
+	if err == nil {
+		t.Errorf("GIF shouldn't be saved within VIPS")
+	}
+}
+
+func TestImagePdfResize(t *testing.T) {
+	_, err := initImage("test.pdf").Resize(300, 240)
+	if err == nil {
+		t.Errorf("PDF cannot be saved within VIPS")
+	}
+}
+
+func TestImageSvgResize(t *testing.T) {
+	_, err := initImage("test.svg").Resize(300, 240)
+	if err == nil {
+		t.Errorf("SVG cannot be saved within VIPS")
+	}
+}
+
+func TestImageGifToJpeg(t *testing.T) {
+	if VipsMajorVersion >= 8 && VipsMinorVersion > 2 {
+		i := initImage("test.gif")
+		options := Options{
+			Type: JPEG,
+		}
+		buf, err := i.Process(options)
+		if err != nil {
+			t.Errorf("Cannot process the image: %#v", err)
+		}
+
+		Write("fixtures/test_gif.jpg", buf)
+	}
+}
+
+func TestImagePdfToJpeg(t *testing.T) {
+	if VipsMajorVersion >= 8 && VipsMinorVersion > 2 {
+		i := initImage("test.pdf")
+		options := Options{
+			Type: JPEG,
+		}
+		buf, err := i.Process(options)
+		if err != nil {
+			t.Errorf("Cannot process the image: %#v", err)
+		}
+
+		Write("fixtures/test_pdf.jpg", buf)
+	}
+}
+
+func TestImageSvgToJpeg(t *testing.T) {
+	if VipsMajorVersion >= 8 && VipsMinorVersion > 2 {
+		i := initImage("test.svg")
+		options := Options{
+			Type: JPEG,
+		}
+		buf, err := i.Process(options)
+		if err != nil {
+			t.Errorf("Cannot process the image: %#v", err)
+		}
+
+		Write("fixtures/test_svg.jpg", buf)
+	}
+}
+
+func TestImageResizeAndCrop(t *testing.T) {
+	buf, err := initImage("test.jpg").ResizeAndCrop(300, 200)
+	if err != nil {
+		t.Errorf("Cannot process the image: %#v", err)
+	}
+
+	err = assertSize(buf, 300, 200)
+	if err != nil {
+		t.Error(err)
+	}
+
+	Write("fixtures/test_resize_crop_out.jpg", buf)
+}
+
+func TestImageExtract(t *testing.T) {
+	buf, err := initImage("test.jpg").Extract(100, 100, 300, 200)
+	if err != nil {
+		t.Errorf("Cannot process the image: %s", err)
+	}
+
+	err = assertSize(buf, 300, 200)
+	if err != nil {
+		t.Error(err)
+	}
+
+	Write("fixtures/test_extract_out.jpg", buf)
+}
+
+func TestImageExtractZero(t *testing.T) {
+	buf, err := initImage("test.jpg").Extract(0, 0, 300, 200)
+	if err != nil {
+		t.Errorf("Cannot process the image: %s", err)
+	}
+
+	err = assertSize(buf, 300, 200)
+	if err != nil {
+		t.Error(err)
+	}
+
+	Write("fixtures/test_extract_zero_out.jpg", buf)
+}
+
+func TestImageEnlarge(t *testing.T) {
+	buf, err := initImage("test.png").Enlarge(500, 375)
+	if err != nil {
+		t.Errorf("Cannot process the image: %#v", err)
+	}
+
+	err = assertSize(buf, 500, 375)
+	if err != nil {
+		t.Error(err)
+	}
+
+	Write("fixtures/test_enlarge_out.jpg", buf)
+}
+
+func TestImageEnlargeAndCrop(t *testing.T) {
+	buf, err := initImage("test.png").EnlargeAndCrop(800, 480)
+	if err != nil {
+		t.Errorf("Cannot process the image: %#v", err)
+	}
+
+	err = assertSize(buf, 800, 480)
+	if err != nil {
+		t.Error(err)
+	}
+
+	Write("fixtures/test_enlarge_crop_out.jpg", buf)
+}
+
+func TestImageCrop(t *testing.T) {
+	buf, err := initImage("test.jpg").Crop(800, 600, GravityNorth)
+	if err != nil {
+		t.Errorf("Cannot process the image: %s", err)
+	}
+
+	err = assertSize(buf, 800, 600)
+	if err != nil {
+		t.Error(err)
+	}
+
+	Write("fixtures/test_crop_out.jpg", buf)
+}
+
+func TestImageCropByWidth(t *testing.T) {
+	buf, err := initImage("test.jpg").CropByWidth(600)
+	if err != nil {
+		t.Errorf("Cannot process the image: %s", err)
+	}
+
+	err = assertSize(buf, 600, 1050)
+	if err != nil {
+		t.Error(err)
+	}
+
+	Write("fixtures/test_crop_width_out.jpg", buf)
+}
+
+func TestImageCropByHeight(t *testing.T) {
+	buf, err := initImage("test.jpg").CropByHeight(300)
+	if err != nil {
+		t.Errorf("Cannot process the image: %s", err)
+	}
+
+	err = assertSize(buf, 1680, 300)
+	if err != nil {
+		t.Error(err)
+	}
+
+	Write("fixtures/test_crop_height_out.jpg", buf)
+}
+
+func TestImageThumbnail(t *testing.T) {
+	buf, err := initImage("test.jpg").Thumbnail(100)
+	if err != nil {
+		t.Errorf("Cannot process the image: %s", err)
+	}
+
+	err = assertSize(buf, 100, 100)
+	if err != nil {
+		t.Error(err)
+	}
+
+	Write("fixtures/test_thumbnail_out.jpg", buf)
+}
+
+func TestImageWatermark(t *testing.T) {
+	image := initImage("test.jpg")
+	_, err := image.Crop(800, 600, GravityNorth)
+	if err != nil {
+		t.Errorf("Cannot process the image: %#v", err)
+	}
+
+	buf, err := image.Watermark(Watermark{
+		Text:       "Copy me if you can",
+		Opacity:    0.5,
+		Width:      200,
+		DPI:        100,
+		Background: Color{255, 255, 255},
+	})
+	if err != nil {
+		t.Error(err)
+	}
+
+	err = assertSize(buf, 800, 600)
+	if err != nil {
+		t.Error(err)
+	}
+
+	if DetermineImageType(buf) != JPEG {
+		t.Fatal("Image is not jpeg")
+	}
+
+	Write("fixtures/test_watermark_text_out.jpg", buf)
+}
+
+func TestImageWatermarkWithImage(t *testing.T) {
+	image := initImage("test.jpg")
+	watermark, _ := imageBuf("transparent.png")
+
+	_, err := image.Crop(800, 600, GravityNorth)
+	if err != nil {
+		t.Errorf("Cannot process the image: %#v", err)
+	}
+
+	buf, err := image.WatermarkImage(WatermarkImage{Left: 100, Top: 100, Buf: watermark})
+
+	if err != nil {
+		t.Error(err)
+	}
+
+	err = assertSize(buf, 800, 600)
+	if err != nil {
+		t.Error(err)
+	}
+
+	if DetermineImageType(buf) != JPEG {
+		t.Fatal("Image is not jpeg")
+	}
+
+	Write("fixtures/test_watermark_image_out.jpg", buf)
+}
+
+func TestImageWatermarkNoReplicate(t *testing.T) {
+	image := initImage("test.jpg")
+	_, err := image.Crop(800, 600, GravityNorth)
+	if err != nil {
+		t.Errorf("Cannot process the image: %s", err)
+	}
+
+	buf, err := image.Watermark(Watermark{
+		Text:        "Copy me if you can",
+		Opacity:     0.5,
+		Width:       200,
+		DPI:         100,
+		NoReplicate: true,
+		Background:  Color{255, 255, 255},
+	})
+	if err != nil {
+		t.Error(err)
+	}
+
+	err = assertSize(buf, 800, 600)
+	if err != nil {
+		t.Error(err)
+	}
+
+	if DetermineImageType(buf) != JPEG {
+		t.Fatal("Image is not jpeg")
+	}
+
+	Write("fixtures/test_watermark_replicate_out.jpg", buf)
+}
+
+func TestImageZoom(t *testing.T) {
+	image := initImage("test.jpg")
+
+	_, err := image.Extract(100, 100, 400, 300)
+	if err != nil {
+		t.Errorf("Cannot extract the image: %s", err)
+	}
+
+	buf, err := image.Zoom(1)
+	if err != nil {
+		t.Errorf("Cannot process the image: %s", err)
+	}
+
+	err = assertSize(buf, 800, 600)
+	if err != nil {
+		t.Error(err)
+	}
+
+	Write("fixtures/test_zoom_out.jpg", buf)
+}
+
+func TestImageFlip(t *testing.T) {
+	buf, err := initImage("test.jpg").Flip()
+	if err != nil {
+		t.Errorf("Cannot process the image: %#v", err)
+	}
+	Write("fixtures/test_flip_out.jpg", buf)
+}
+
+func TestImageFlop(t *testing.T) {
+	buf, err := initImage("test.jpg").Flop()
+	if err != nil {
+		t.Errorf("Cannot process the image: %#v", err)
+	}
+	Write("fixtures/test_flop_out.jpg", buf)
+}
+
+func TestImageRotate(t *testing.T) {
+	buf, err := initImage("test_flip_out.jpg").Rotate(90)
+	if err != nil {
+		t.Errorf("Cannot process the image: %#v", err)
+	}
+	Write("fixtures/test_image_rotate_out.jpg", buf)
+}
+
+func TestImageConvert(t *testing.T) {
+	buf, err := initImage("test.jpg").Convert(PNG)
+	if err != nil {
+		t.Errorf("Cannot process the image: %#v", err)
+	}
+	Write("fixtures/test_image_convert_out.png", buf)
+}
+
+func TestTransparentImageConvert(t *testing.T) {
+	image := initImage("transparent.png")
+	options := Options{
+		Type:       JPEG,
+		Background: Color{255, 255, 255},
+	}
+	buf, err := image.Process(options)
+	if err != nil {
+		t.Errorf("Cannot process the image: %#v", err)
+	}
+	Write("fixtures/test_transparent_image_convert_out.jpg", buf)
+}
+
+func TestImageMetadata(t *testing.T) {
+	data, err := initImage("test.png").Metadata()
+	if err != nil {
+		t.Errorf("Cannot process the image: %#v", err)
+	}
+	if data.Alpha != true {
+		t.Fatal("Invalid alpha channel")
+	}
+	if data.Size.Width != 400 {
+		t.Fatal("Invalid width size")
+	}
+	if data.Type != "png" {
+		t.Fatal("Invalid image type")
+	}
+}
+
+func TestInterpretation(t *testing.T) {
+	interpretation, err := initImage("test.jpg").Interpretation()
+	if err != nil {
+		t.Errorf("Cannot process the image: %#v", err)
+	}
+	if interpretation != InterpretationSRGB {
+		t.Errorf("Invalid interpretation: %d", interpretation)
+	}
+}
+
+func TestImageColourspace(t *testing.T) {
+	tests := []struct {
+		file           string
+		interpretation Interpretation
+	}{
+		{"test.jpg", InterpretationSRGB},
+		{"test.jpg", InterpretationBW},
+	}
+
+	for _, test := range tests {
+		buf, err := initImage(test.file).Colourspace(test.interpretation)
+		if err != nil {
+			t.Errorf("Cannot process the image: %#v", err)
+		}
+
+		interpretation, err := ImageInterpretation(buf)
+		if interpretation != test.interpretation {
+			t.Errorf("Invalid colourspace")
+		}
+	}
+}
+
+func TestImageColourspaceIsSupported(t *testing.T) {
+	supported, err := initImage("test.jpg").ColourspaceIsSupported()
+	if err != nil {
+		t.Errorf("Cannot process the image: %#v", err)
+	}
+	if supported != true {
+		t.Errorf("Non-supported colourspace")
+	}
+}
+
+func TestFluentInterface(t *testing.T) {
+	image := initImage("test.jpg")
+	_, err := image.CropByWidth(300)
+	if err != nil {
+		t.Errorf("Cannot process the image: %#v", err)
+	}
+
+	_, err = image.Flip()
+	if err != nil {
+		t.Errorf("Cannot process the image: %#v", err)
+	}
+
+	_, err = image.Convert(PNG)
+	if err != nil {
+		t.Errorf("Cannot process the image: %#v", err)
+	}
+
+	data, _ := image.Metadata()
+	if data.Alpha != false {
+		t.Fatal("Invalid alpha channel")
+	}
+	if data.Size.Width != 300 {
+		t.Fatal("Invalid width size")
+	}
+	if data.Type != "png" {
+		t.Fatal("Invalid image type")
+	}
+
+	Write("fixtures/test_image_fluent_out.png", image.Image())
+}
+
+func TestImageSmartCrop(t *testing.T) {
+
+	if !(VipsMajorVersion >= 8 && VipsMinorVersion > 4) {
+		t.Skipf("Skipping this test, libvips doesn't meet version requirement %s > 8.4", VipsVersion)
+	}
+
+	i := initImage("northern_cardinal_bird.jpg")
+	buf, err := i.SmartCrop(300, 300)
+	if err != nil {
+		t.Errorf("Cannot process the image: %#v", err)
+	}
+
+	err = assertSize(buf, 300, 300)
+	if err != nil {
+		t.Error(err)
+	}
+
+	Write("fixtures/test_smart_crop.jpg", buf)
+}
+
+func initImage(file string) *Image {
+	buf, _ := imageBuf(file)
+	return NewImage(buf)
+}
+
+func imageBuf(file string) ([]byte, error) {
+	return Read(path.Join("fixtures", file))
+}
+
+func assertSize(buf []byte, width, height int) error {
+	size, err := NewImage(buf).Size()
+	if err != nil {
+		return err
+	}
+	if size.Width != width || size.Height != height {
+		return fmt.Errorf("Invalid image size: %dx%d", size.Width, size.Height)
+	}
+	return nil
+}

vendor/src/gopkg.in/h2non/bimg.v1/metadata.go

@@ -0,0 +1,77 @@
+package bimg
+
+/*
+#cgo pkg-config: vips
+#include "vips/vips.h"
+*/
+import "C"
+
+// ImageSize represents the image width and height values
+type ImageSize struct {
+	Width  int
+	Height int
+}
+
+// ImageMetadata represents the basic metadata fields
+type ImageMetadata struct {
+	Orientation int
+	Channels    int
+	Alpha       bool
+	Profile     bool
+	Type        string
+	Space       string
+	Colourspace string
+	Size        ImageSize
+}
+
+// Size returns the image size by width and height pixels.
+func Size(buf []byte) (ImageSize, error) {
+	metadata, err := Metadata(buf)
+	if err != nil {
+		return ImageSize{}, err
+	}
+
+	return ImageSize{
+		Width:  int(metadata.Size.Width),
+		Height: int(metadata.Size.Height),
+	}, nil
+}
+
+// ColourspaceIsSupported checks if the image colourspace is supported by libvips.
+func ColourspaceIsSupported(buf []byte) (bool, error) {
+	return vipsColourspaceIsSupportedBuffer(buf)
+}
+
+// ImageInterpretation returns the image interpretation type.
+// See: http://www.vips.ecs.soton.ac.uk/supported/current/doc/html/libvips/VipsImage.html#VipsInterpretation
+func ImageInterpretation(buf []byte) (Interpretation, error) {
+	return vipsInterpretationBuffer(buf)
+}
+
+// Metadata returns the image metadata (size, type, alpha channel, profile, EXIF orientation...).
+func Metadata(buf []byte) (ImageMetadata, error) {
+	defer C.vips_thread_shutdown()
+
+	image, imageType, err := vipsRead(buf)
+	if err != nil {
+		return ImageMetadata{}, err
+	}
+	defer C.g_object_unref(C.gpointer(image))
+
+	size := ImageSize{
+		Width:  int(image.Xsize),
+		Height: int(image.Ysize),
+	}
+
+	metadata := ImageMetadata{
+		Size:        size,
+		Channels:    int(image.Bands),
+		Orientation: vipsExifOrientation(image),
+		Alpha:       vipsHasAlpha(image),
+		Profile:     vipsHasProfile(image),
+		Space:       vipsSpace(image),
+		Type:        ImageTypeName(imageType),
+	}
+
+	return metadata, nil
+}

vendor/src/gopkg.in/h2non/bimg.v1/metadata_test.go

@@ -0,0 +1,124 @@
+package bimg
+
+import (
+	"io/ioutil"
+	"os"
+	"path"
+	"testing"
+)
+
+func TestSize(t *testing.T) {
+	files := []struct {
+		name   string
+		width  int
+		height int
+	}{
+		{"test.jpg", 1680, 1050},
+		{"test.png", 400, 300},
+		{"test.webp", 550, 368},
+	}
+	for _, file := range files {
+		size, err := Size(readFile(file.name))
+		if err != nil {
+			t.Fatalf("Cannot read the image: %#v", err)
+		}
+
+		if size.Width != file.width || size.Height != file.height {
+			t.Fatalf("Unexpected image size: %dx%d", size.Width, size.Height)
+		}
+	}
+}
+
+func TestMetadata(t *testing.T) {
+	files := []struct {
+		name        string
+		format      string
+		orientation int
+		alpha       bool
+		profile     bool
+		space       string
+	}{
+		{"test.jpg", "jpeg", 0, false, false, "srgb"},
+		{"test_icc_prophoto.jpg", "jpeg", 0, false, true, "srgb"},
+		{"test.png", "png", 0, true, false, "srgb"},
+		{"test.webp", "webp", 0, false, false, "srgb"},
+	}
+
+	for _, file := range files {
+		metadata, err := Metadata(readFile(file.name))
+		if err != nil {
+			t.Fatalf("Cannot read the image: %s -> %s", file.name, err)
+		}
+
+		if metadata.Type != file.format {
+			t.Fatalf("Unexpected image format: %s", file.format)
+		}
+		if metadata.Orientation != file.orientation {
+			t.Fatalf("Unexpected image orientation: %d != %d", metadata.Orientation, file.orientation)
+		}
+		if metadata.Alpha != file.alpha {
+			t.Fatalf("Unexpected image alpha: %t != %t", metadata.Alpha, file.alpha)
+		}
+		if metadata.Profile != file.profile {
+			t.Fatalf("Unexpected image profile: %t != %t", metadata.Profile, file.profile)
+		}
+		if metadata.Space != file.space {
+			t.Fatalf("Unexpected image profile: %t != %t", metadata.Profile, file.profile)
+		}
+	}
+}
+
+func TestImageInterpretation(t *testing.T) {
+	files := []struct {
+		name           string
+		interpretation Interpretation
+	}{
+		{"test.jpg", InterpretationSRGB},
+		{"test.png", InterpretationSRGB},
+		{"test.webp", InterpretationSRGB},
+	}
+
+	for _, file := range files {
+		interpretation, err := ImageInterpretation(readFile(file.name))
+		if err != nil {
+			t.Fatalf("Cannot read the image: %s -> %s", file.name, err)
+		}
+		if interpretation != file.interpretation {
+			t.Fatalf("Unexpected image interpretation")
+		}
+	}
+}
+
+func TestColourspaceIsSupported(t *testing.T) {
+	files := []struct {
+		name string
+	}{
+		{"test.jpg"},
+		{"test.png"},
+		{"test.webp"},
+	}
+
+	for _, file := range files {
+		supported, err := ColourspaceIsSupported(readFile(file.name))
+		if err != nil {
+			t.Fatalf("Cannot read the image: %s -> %s", file.name, err)
+		}
+		if supported != true {
+			t.Fatalf("Unsupported image colourspace")
+		}
+	}
+
+	supported, err := initImage("test.jpg").ColourspaceIsSupported()
+	if err != nil {
+		t.Errorf("Cannot process the image: %#v", err)
+	}
+	if supported != true {
+		t.Errorf("Non-supported colourspace")
+	}
+}
+
+func readFile(file string) []byte {
+	data, _ := os.Open(path.Join("fixtures", file))
+	buf, _ := ioutil.ReadAll(data)
+	return buf
+}

vendor/src/gopkg.in/h2non/bimg.v1/options.go

@@ -0,0 +1,218 @@
+package bimg
+
+/*
+#cgo pkg-config: vips
+#include "vips/vips.h"
+*/
+import "C"
+
+const (
+	// Quality defines the default JPEG quality to be used.
+	Quality = 80
+	// MaxSize defines the maximum pixels width or height supported.
+	MaxSize = 16383
+)
+
+// Gravity represents the image gravity value.
+type Gravity int
+
+const (
+	// GravityCentre represents the centre value used for image gravity orientation.
+	GravityCentre Gravity = iota
+	// GravityNorth represents the north value used for image gravity orientation.
+	GravityNorth
+	// GravityEast represents the east value used for image gravity orientation.
+	GravityEast
+	// GravitySouth represents the south value used for image gravity orientation.
+	GravitySouth
+	// GravityWest represents the west value used for image gravity orientation.
+	GravityWest
+	// GravitySmart enables libvips Smart Crop algorithm for image gravity orientation.
+	GravitySmart
+)
+
+// Interpolator represents the image interpolation value.
+type Interpolator int
+
+const (
+	// Bicubic interpolation value.
+	Bicubic Interpolator = iota
+	// Bilinear interpolation value.
+	Bilinear
+	// Nohalo interpolation value.
+	Nohalo
+)
+
+var interpolations = map[Interpolator]string{
+	Bicubic:  "bicubic",
+	Bilinear: "bilinear",
+	Nohalo:   "nohalo",
+}
+
+func (i Interpolator) String() string {
+	return interpolations[i]
+}
+
+// Angle represents the image rotation angle value.
+type Angle int
+
+const (
+	// D0 represents the rotation angle 0 degrees.
+	D0 Angle = 0
+	// D45 represents the rotation angle 90 degrees.
+	D45 Angle = 45
+	// D90 represents the rotation angle 90 degrees.
+	D90 Angle = 90
+	// D135 represents the rotation angle 90 degrees.
+	D135 Angle = 135
+	// D180 represents the rotation angle 180 degrees.
+	D180 Angle = 180
+	// D235 represents the rotation angle 235 degrees.
+	D235 Angle = 235
+	// D270 represents the rotation angle 270 degrees.
+	D270 Angle = 270
+	// D315 represents the rotation angle 180 degrees.
+	D315 Angle = 315
+)
+
+// Direction represents the image direction value.
+type Direction int
+
+const (
+	// Horizontal represents the orizontal image direction value.
+	Horizontal Direction = C.VIPS_DIRECTION_HORIZONTAL
+	// Vertical represents the vertical image direction value.
+	Vertical Direction = C.VIPS_DIRECTION_VERTICAL
+)
+
+// Interpretation represents the image interpretation type.
+// See: http://www.vips.ecs.soton.ac.uk/supported/current/doc/html/libvips/VipsImage.html#VipsInterpretation
+type Interpretation int
+
+const (
+	// InterpretationError points to the libvips interpretation error type.
+	InterpretationError Interpretation = C.VIPS_INTERPRETATION_ERROR
+	// InterpretationMultiband points to its libvips interpretation equivalent type.
+	InterpretationMultiband Interpretation = C.VIPS_INTERPRETATION_MULTIBAND
+	// InterpretationBW points to its libvips interpretation equivalent type.
+	InterpretationBW Interpretation = C.VIPS_INTERPRETATION_B_W
+	// InterpretationCMYK points to its libvips interpretation equivalent type.
+	InterpretationCMYK Interpretation = C.VIPS_INTERPRETATION_CMYK
+	// InterpretationRGB points to its libvips interpretation equivalent type.
+	InterpretationRGB Interpretation = C.VIPS_INTERPRETATION_RGB
+	// InterpretationSRGB points to its libvips interpretation equivalent type.
+	InterpretationSRGB Interpretation = C.VIPS_INTERPRETATION_sRGB
+	// InterpretationRGB16 points to its libvips interpretation equivalent type.
+	InterpretationRGB16 Interpretation = C.VIPS_INTERPRETATION_RGB16
+	// InterpretationGREY16 points to its libvips interpretation equivalent type.
+	InterpretationGREY16 Interpretation = C.VIPS_INTERPRETATION_GREY16
+	// InterpretationScRGB points to its libvips interpretation equivalent type.
+	InterpretationScRGB Interpretation = C.VIPS_INTERPRETATION_scRGB
+	// InterpretationLAB points to its libvips interpretation equivalent type.
+	InterpretationLAB Interpretation = C.VIPS_INTERPRETATION_LAB
+	// InterpretationXYZ points to its libvips interpretation equivalent type.
+	InterpretationXYZ Interpretation = C.VIPS_INTERPRETATION_XYZ
+)
+
+// Extend represents the image extend mode, used when the edges
+// of an image are extended, you can specify how you want the extension done.
+// See: http://www.vips.ecs.soton.ac.uk/supported/8.4/doc/html/libvips/libvips-conversion.html#VIPS-EXTEND-BACKGROUND:CAPS
+type Extend int
+
+const (
+	// ExtendBlack extend with black (all 0) pixels mode.
+	ExtendBlack Extend = C.VIPS_EXTEND_BLACK
+	// ExtendCopy copy the image edges.
+	ExtendCopy Extend = C.VIPS_EXTEND_COPY
+	// ExtendRepeat repeat the whole image.
+	ExtendRepeat Extend = C.VIPS_EXTEND_REPEAT
+	// ExtendMirror mirror the whole image.
+	ExtendMirror Extend = C.VIPS_EXTEND_MIRROR
+	// ExtendWhite extend with white (all bits set) pixels.
+	ExtendWhite Extend = C.VIPS_EXTEND_WHITE
+	// ExtendBackground with colour from the background property.
+	ExtendBackground Extend = C.VIPS_EXTEND_BACKGROUND
+	// ExtendLast extend with last pixel.
+	ExtendLast Extend = C.VIPS_EXTEND_LAST
+)
+
+// WatermarkFont defines the default watermark font to be used.
+var WatermarkFont = "sans 10"
+
+// Color represents a traditional RGB color scheme.
+type Color struct {
+	R, G, B uint8
+}
+
+// ColorBlack is a shortcut to black RGB color representation.
+var ColorBlack = Color{0, 0, 0}
+
+// Watermark represents the text-based watermark supported options.
+type Watermark struct {
+	Width       int
+	DPI         int
+	Margin      int
+	Opacity     float32
+	NoReplicate bool
+	Text        string
+	Font        string
+	Background  Color
+}
+
+// WatermarkImage represents the image-based watermark supported options.
+type WatermarkImage struct {
+	Left    int
+	Top     int
+	Buf     []byte
+	Opacity float32
+}
+
+// GaussianBlur represents the gaussian image transformation values.
+type GaussianBlur struct {
+	Sigma   float64
+	MinAmpl float64
+}
+
+// Sharpen represents the image sharp transformation options.
+type Sharpen struct {
+	Radius int
+	X1     float64
+	Y2     float64
+	Y3     float64
+	M1     float64
+	M2     float64
+}
+
+// Options represents the supported image transformation options.
+type Options struct {
+	Height         int
+	Width          int
+	AreaHeight     int
+	AreaWidth      int
+	Top            int
+	Left           int
+	Quality        int
+	Compression    int
+	Zoom           int
+	Crop           bool
+	SmartCrop      bool // Deprecated
+	Enlarge        bool
+	Embed          bool
+	Flip           bool
+	Flop           bool
+	Force          bool
+	NoAutoRotate   bool
+	NoProfile      bool
+	Interlace      bool
+	Extend         Extend
+	Rotate         Angle
+	Background     Color
+	Gravity        Gravity
+	Watermark      Watermark
+	WatermarkImage WatermarkImage
+	Type           ImageType
+	Interpolator   Interpolator
+	Interpretation Interpretation
+	GaussianBlur   GaussianBlur
+	Sharpen        Sharpen
+}

vendor/src/gopkg.in/h2non/bimg.v1/preinstall.sh

@@ -0,0 +1,302 @@
+#!/bin/bash
+
+vips_version_minimum=8.4.2
+vips_version_latest_major_minor=8.4
+vips_version_latest_patch=2
+
+openslide_version_minimum=3.4.0
+openslide_version_latest_major_minor=3.4
+openslide_version_latest_patch=1
+
+install_libvips_from_source() {
+  echo "Compiling libvips $vips_version_latest_major_minor.$vips_version_latest_patch from source"
+  curl -O http://www.vips.ecs.soton.ac.uk/supported/$vips_version_latest_major_minor/vips-$vips_version_latest_major_minor.$vips_version_latest_patch.tar.gz
+  tar zvxf vips-$vips_version_latest_major_minor.$vips_version_latest_patch.tar.gz
+  cd vips-$vips_version_latest_major_minor.$vips_version_latest_patch
+  CXXFLAGS="-D_GLIBCXX_USE_CXX11_ABI=0" ./configure --disable-debug --disable-docs --disable-static --disable-introspection --disable-dependency-tracking --enable-cxx=yes --without-python --without-orc --without-fftw $1
+  make
+  make install
+  cd ..
+  rm -rf vips-$vips_version_latest_major_minor.$vips_version_latest_patch
+  rm vips-$vips_version_latest_major_minor.$vips_version_latest_patch.tar.gz
+  ldconfig
+  echo "Installed libvips $(PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/usr/local/lib/pkgconfig:/usr/lib/pkgconfig pkg-config --modversion vips)"
+}
+
+install_libopenslide_from_source() {
+  echo "Compiling openslide $openslide_version_latest_major_minor.$openslide_version_latest_patch from source"
+  curl -O -L https://github.com/openslide/openslide/releases/download/v$openslide_version_latest_major_minor.$openslide_version_latest_patch/openslide-$openslide_version_latest_major_minor.$openslide_version_latest_patch.tar.gz
+  tar xzvf openslide-$openslide_version_latest_major_minor.$openslide_version_latest_patch.tar.gz
+  cd openslide-$openslide_version_latest_major_minor.$openslide_version_latest_patch
+  PKG_CONFIG_PATH=$pkg_config_path ./configure $1
+  make
+  make install
+  cd ..
+  rm -rf openslide-$openslide_version_latest_major_minor.$openslide_version_latest_patch
+  rm openslide-$openslide_version_latest_major_minor.$openslide_version_latest_patch.tar.gz
+  ldconfig
+  echo "Installed libopenslide $openslide_version_latest_major_minor.$openslide_version_latest_patch"
+}
+
+sorry() {
+  echo "Sorry, I don't yet know how to install lib$1 on $2"
+  exit 1
+}
+
+pkg_config_path="$PKG_CONFIG_PATH:/usr/local/lib/pkgconfig:/usr/lib/pkgconfig"
+
+check_if_library_exists() {
+  PKG_CONFIG_PATH=$pkg_config_path pkg-config --exists $1
+  if [ $? -eq 0 ]; then
+    version_found=$(PKG_CONFIG_PATH=$pkg_config_path pkg-config --modversion $1)
+    PKG_CONFIG_PATH=$pkg_config_path pkg-config --atleast-version=$2 $1
+    if [ $? -eq 0 ]; then
+      # Found suitable version of libvips
+      echo "Found lib$1 $version_found"
+      return 1
+    fi
+    echo "Found lib$1 $version_found but require $2"
+  else
+    echo "Could not find lib$1 using a PKG_CONFIG_PATH of '$pkg_config_path'"
+  fi
+  return 0
+}
+
+enable_openslide=0
+# Is libvips already installed, and is it at least the minimum required version?
+if [ $# -eq 1 ]; then
+  if [ "$1" = "--with-openslide" ]; then
+    echo "Installing vips with openslide support"
+    enable_openslide=1
+  else
+    echo "Sorry, $1 is not supported. Did you mean --with-openslide?"
+    exit 1
+  fi
+fi
+
+if ! type pkg-config >/dev/null; then
+  sorry "vips" "a system without pkg-config"
+fi
+
+openslide_exists=0
+if [ $enable_openslide -eq 1 ]; then
+  check_if_library_exists "openslide" "$openslide_version_minimum"
+  openslide_exists=$?
+fi
+
+check_if_library_exists "vips" "$vips_version_minimum"
+vips_exists=$?
+if [ $vips_exists -eq 1 ] && [ $enable_openslide -eq 1 ]; then
+  if [ $openslide_exists -eq 1 ]; then
+    # Check if vips compiled with openslide support
+    vips_with_openslide=`vips list classes | grep -i opensli`
+    if [ -z $vips_with_openslide ]; then
+      echo "Vips compiled without openslide support."
+    else
+      exit 0
+    fi
+  fi
+elif [ $vips_exists -eq 1 ] && [ $enable_openslide -eq 0 ]; then
+  exit 0
+fi
+
+# Verify root/sudo access
+if [ "$(id -u)" -ne "0" ]; then
+  echo "Sorry, I need root/sudo access to continue"
+  exit 1
+fi
+
+# Deprecation warning
+if [ "$(arch)" == "x86_64" ]; then
+  echo "This script is no longer required on most 64-bit Linux systems when using sharp v0.12.0+"
+fi
+
+# OS-specific installations of libopenslide follows
+# Either openslide does not exist, or vips is installed without openslide support
+if [ $enable_openslide -eq 1 ] && [ -z $vips_with_openslide ] && [ $openslide_exists -eq 0 ]; then
+  if [ -f /etc/debian_version ]; then
+    # Debian Linux
+    DISTRO=$(lsb_release -c -s)
+    echo "Detected Debian Linux '$DISTRO'"
+    case "$DISTRO" in
+      jessie|vivid|wily|xenial)
+        # Debian 8, Ubuntu 15
+        echo "Installing libopenslide via apt-get"
+        apt-get install -y libopenslide-dev
+        ;;
+      trusty|utopic|qiana|rebecca|rafaela|freya|rosa|sarah|serena)
+        # Ubuntu 14, Mint 17+
+        echo "Installing libopenslide dependencies via apt-get"
+        apt-get install -y automake build-essential curl zlib1g-dev libopenjpeg-dev libpng12-dev libjpeg-dev libtiff5-dev libgdk-pixbuf2.0-dev libxml2-dev libsqlite3-dev libcairo2-dev libglib2.0-dev sqlite3 libsqlite3-dev
+        install_libopenslide_from_source
+        ;;
+      precise|wheezy|maya)
+        # Debian 7, Ubuntu 12.04, Mint 13
+        echo "Installing libopenslide dependencies via apt-get"
+        apt-get install -y automake build-essential curl zlib1g-dev libopenjpeg-dev libpng12-dev libjpeg-dev libtiff5-dev libgdk-pixbuf2.0-dev libxml2-dev libsqlite3-dev libcairo2-dev libglib2.0-dev sqlite3 libsqlite3-dev
+        install_libopenslide_from_source
+        ;;
+      *)
+        # Unsupported Debian-based OS
+        sorry "openslide" "Debian-based $DISTRO"
+        ;;
+    esac
+  elif [ -f /etc/redhat-release ]; then
+    # Red Hat Linux
+    RELEASE=$(cat /etc/redhat-release)
+    echo "Detected Red Hat Linux '$RELEASE'"
+    case $RELEASE in
+      "Red Hat Enterprise Linux release 7."*|"CentOS Linux release 7."*|"Scientific Linux release 7."*)
+        # RHEL/CentOS 7
+        echo "Installing libopenslide dependencies via yum"
+        yum groupinstall -y "Development Tools"
+        yum install -y tar curl libpng-devel libjpeg-devel libxml2-devel zlib-devel openjpeg-devel libtiff-devel gdk-pixbuf2-devel sqlite-devel cairo-devel glib2-devel
+        install_libopenslide_from_source "--prefix=/usr"
+        ;;
+      "Red Hat Enterprise Linux release 6."*|"CentOS release 6."*|"Scientific Linux release 6."*)
+        # RHEL/CentOS 6
+        echo "Installing libopenslide dependencies via yum"
+        yum groupinstall -y "Development Tools"
+        yum install -y tar curl libpng-devel libjpeg-devel libxml2-devel zlib-devel openjpeg-devel libtiff-devel gdk-pixbuf2-devel sqlite-devel cairo-devel glib2-devel
+        install_libopenslide_from_source "--prefix=/usr"
+        ;;
+      "Fedora release 21 "*|"Fedora release 22 "*)
+        # Fedora 21, 22
+        echo "Installing libopenslide via yum"
+        yum install -y openslide-devel
+        ;;
+      *)
+        # Unsupported RHEL-based OS
+        sorry "openslide" "$RELEASE"
+        ;;
+    esac
+  elif [ -f /etc/os-release ]; then
+    RELEASE=$(cat /etc/os-release | grep VERSION)
+    echo "Detected OpenSuse Linux '$RELEASE'"
+    case $RELEASE in
+      *"13.2"*)
+      echo "Installing libopenslide via zypper"
+      zypper --gpg-auto-import-keys install -y libopenslide-devel
+      ;;
+    esac
+  elif [ -f /etc/SuSE-brand ]; then
+    RELEASE=$(cat /etc/SuSE-brand | grep VERSION)
+    echo "Detected OpenSuse Linux '$RELEASE'"
+    case $RELEASE in
+      *"13.1")
+      echo "Installing libopenslide dependencies via zypper"
+      zypper --gpg-auto-import-keys install -y --type pattern devel_basis
+      zypper --gpg-auto-import-keys install -y tar curl libpng16-devel libjpeg-turbo libjpeg8-devel libxml2-devel zlib-devel openjpeg-devel libtiff-devel libgdk_pixbuf-2_0-0 sqlite3-devel cairo-devel glib2-devel
+      install_libopenslide_from_source
+      ;;
+    esac
+  else
+    # Unsupported OS
+    sorry "openslide" "$(uname -a)"
+  fi
+fi
+
+# OS-specific installations of libvips follows
+
+if [ -f /etc/debian_version ]; then
+  # Debian Linux
+  DISTRO=$(lsb_release -c -s)
+  echo "Detected Debian Linux '$DISTRO'"
+  case "$DISTRO" in
+    jessie|trusty|utopic|vivid|wily|xenial|qiana|rebecca|rafaela|freya|rosa|sarah|serena)
+      # Debian 8, Ubuntu 14.04+, Mint 17+
+      echo "Installing libvips dependencies via apt-get"
+      apt-get install -y automake build-essential gobject-introspection gtk-doc-tools libglib2.0-dev libjpeg-dev libpng12-dev libwebp-dev libtiff5-dev libexif-dev libgsf-1-dev liblcms2-dev libxml2-dev swig libmagickcore-dev curl
+      install_libvips_from_source
+      ;;
+    precise|wheezy|maya)
+      # Debian 7, Ubuntu 12.04, Mint 13
+      echo "Installing libvips dependencies via apt-get"
+      add-apt-repository -y ppa:lyrasis/precise-backports
+      apt-get update
+      apt-get install -y automake build-essential gobject-introspection gtk-doc-tools libglib2.0-dev libjpeg-dev libpng12-dev libwebp-dev libtiff4-dev libexif-dev libgsf-1-dev liblcms2-dev libxml2-dev swig libmagickcore-dev curl
+      install_libvips_from_source
+      ;;
+    *)
+      # Unsupported Debian-based OS
+      sorry "vips" "Debian-based $DISTRO"
+      ;;
+  esac
+elif [ -f /etc/redhat-release ]; then
+  # Red Hat Linux
+  RELEASE=$(cat /etc/redhat-release)
+  echo "Detected Red Hat Linux '$RELEASE'"
+  case $RELEASE in
+    "Red Hat Enterprise Linux release 7."*|"CentOS Linux release 7."*|"Scientific Linux release 7."*)
+      # RHEL/CentOS 7
+      echo "Installing libvips dependencies via yum"
+      yum groupinstall -y "Development Tools"
+      yum install -y tar curl gtk-doc libxml2-devel libjpeg-turbo-devel libpng-devel libtiff-devel libexif-devel libgsf-devel lcms2-devel ImageMagick-devel gobject-introspection-devel libwebp-devel
+      install_libvips_from_source "--prefix=/usr"
+      ;;
+    "Red Hat Enterprise Linux release 6."*|"CentOS release 6."*|"Scientific Linux release 6."*)
+      # RHEL/CentOS 6
+      echo "Installing libvips dependencies via yum"
+      yum groupinstall -y "Development Tools"
+      yum install -y tar curl gtk-doc libxml2-devel libjpeg-turbo-devel libpng-devel libtiff-devel libexif-devel libgsf-devel lcms-devel ImageMagick-devel
+      yum install -y http://li.nux.ro/download/nux/dextop/el6/x86_64/nux-dextop-release-0-2.el6.nux.noarch.rpm
+      yum install -y --enablerepo=nux-dextop gobject-introspection-devel
+      yum install -y http://rpms.famillecollet.com/enterprise/remi-release-6.rpm
+      yum install -y --enablerepo=remi libwebp-devel
+      install_libvips_from_source "--prefix=/usr"
+      ;;
+    "Fedora"*)
+      # Fedora 21, 22, 23
+      echo "Installing libvips dependencies via yum"
+      yum groupinstall -y "Development Tools"
+      yum install -y gcc-c++ gtk-doc libxml2-devel libjpeg-turbo-devel libpng-devel libtiff-devel libexif-devel lcms-devel ImageMagick-devel gobject-introspection-devel libwebp-devel curl
+      install_libvips_from_source "--prefix=/usr"
+      ;;
+    *)
+      # Unsupported RHEL-based OS
+      sorry "vips" "$RELEASE"
+      ;;
+  esac
+elif [ -f /etc/system-release ]; then
+  # Probably Amazon Linux
+  RELEASE=$(cat /etc/system-release)
+  case $RELEASE in
+    "Amazon Linux AMI release 2015.03"|"Amazon Linux AMI release 2015.09")
+      # Amazon Linux
+      echo "Detected '$RELEASE'"
+      echo "Installing libvips dependencies via yum"
+      yum groupinstall -y "Development Tools"
+      yum install -y gtk-doc libxml2-devel libjpeg-turbo-devel libpng-devel libtiff-devel libexif-devel libgsf-devel lcms2-devel ImageMagick-devel gobject-introspection-devel libwebp-devel curl
+      install_libvips_from_source "--prefix=/usr"
+      ;;
+    *)
+      # Unsupported Amazon Linux version
+      sorry "vips" "$RELEASE"
+      ;;
+  esac
+elif [ -f /etc/os-release ]; then
+  RELEASE=$(cat /etc/os-release | grep VERSION)
+  echo "Detected OpenSuse Linux '$RELEASE'"
+  case $RELEASE in
+    *"13.2"*)
+    echo "Installing libvips dependencies via zypper"
+    zypper --gpg-auto-import-keys install -y --type pattern devel_basis
+    zypper --gpg-auto-import-keys install -y tar curl gtk-doc libxml2-devel libjpeg-turbo libjpeg8-devel libpng16-devel libtiff-devel libexif-devel liblcms2-devel ImageMagick-devel gobject-introspection-devel libwebp-devel
+    install_libvips_from_source
+    ;;
+  esac
+elif [ -f /etc/SuSE-brand ]; then
+  RELEASE=$(cat /etc/SuSE-brand | grep VERSION)
+  echo "Detected OpenSuse Linux '$RELEASE'"
+  case $RELEASE in
+    *"13.1")
+    echo "Installing libvips dependencies via zypper"
+    zypper --gpg-auto-import-keys install -y --type pattern devel_basis
+    zypper --gpg-auto-import-keys install -y tar curl gtk-doc libxml2-devel libjpeg-turbo libjpeg8-devel libpng16-devel libtiff-devel libexif-devel liblcms2-devel ImageMagick-devel gobject-introspection-devel libwebp-devel
+    install_libvips_from_source
+    ;;
+  esac
+else
+  # Unsupported OS
+  sorry "vips" "$(uname -a)"
+fi

vendor/src/gopkg.in/h2non/bimg.v1/resize.go

@@ -0,0 +1,561 @@
+package bimg
+
+/*
+#cgo pkg-config: vips
+#include "vips/vips.h"
+*/
+import "C"
+
+import (
+	"errors"
+	"math"
+)
+
+// Resize is used to transform a given image as byte buffer
+// with the passed options.
+func Resize(buf []byte, o Options) ([]byte, error) {
+	defer C.vips_thread_shutdown()
+
+	image, imageType, err := loadImage(buf)
+
+	if err != nil {
+		return nil, err
+	}
+
+	// Clone and define default options
+	o = applyDefaults(o, imageType)
+
+	if !IsTypeSupported(o.Type) {
+		return nil, errors.New("Unsupported image output type")
+	}
+
+	debug("Options: %#v", o)
+
+	// Auto rotate image based on EXIF orientation header
+	image, rotated, err := rotateAndFlipImage(image, o)
+	if err != nil {
+		return nil, err
+	}
+
+	// If JPEG image, retrieve the buffer
+	if rotated && imageType == JPEG && !o.NoAutoRotate {
+		buf, err = getImageBuffer(image)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	inWidth := int(image.Xsize)
+	inHeight := int(image.Ysize)
+
+	// Infer the required operation based on the in/out image sizes for a coherent transformation
+	normalizeOperation(&o, inWidth, inHeight)
+
+	// image calculations
+	factor := imageCalculations(&o, inWidth, inHeight)
+	shrink := calculateShrink(factor, o.Interpolator)
+	residual := calculateResidual(factor, shrink)
+
+	// Do not enlarge the output if the input width or height
+	// are already less than the required dimensions
+	if !o.Enlarge && !o.Force {
+		if inWidth < o.Width && inHeight < o.Height {
+			factor = 1.0
+			shrink = 1
+			residual = 0
+			o.Width = inWidth
+			o.Height = inHeight
+		}
+	}
+
+	// Try to use libjpeg shrink-on-load
+	if imageType == JPEG && shrink >= 2 {
+		tmpImage, factor, err := shrinkJpegImage(buf, image, factor, shrink)
+		if err != nil {
+			return nil, err
+		}
+
+		image = tmpImage
+		factor = math.Max(factor, 1.0)
+		shrink = int(math.Floor(factor))
+		residual = float64(shrink) / factor
+	}
+
+	// Zoom image, if necessary
+	image, err = zoomImage(image, o.Zoom)
+	if err != nil {
+		return nil, err
+	}
+
+	// Transform image, if necessary
+	if shouldTransformImage(o, inWidth, inHeight) {
+		image, err = transformImage(image, o, shrink, residual)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	// Apply effects, if necessary
+	if shouldApplyEffects(o) {
+		image, err = applyEffects(image, o)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	// Add watermark, if necessary
+	image, err = watermarkImageWithText(image, o.Watermark)
+	if err != nil {
+		return nil, err
+	}
+
+	// Add watermark, if necessary
+	image, err = watermarkImageWithAnotherImage(image, o.WatermarkImage)
+	if err != nil {
+		return nil, err
+	}
+
+	// Flatten image on a background, if necessary
+	image, err = imageFlatten(image, imageType, o)
+	if err != nil {
+		return nil, err
+	}
+
+	return saveImage(image, o)
+}
+
+func loadImage(buf []byte) (*C.VipsImage, ImageType, error) {
+	if len(buf) == 0 {
+		return nil, JPEG, errors.New("Image buffer is empty")
+	}
+
+	image, imageType, err := vipsRead(buf)
+	if err != nil {
+		return nil, JPEG, err
+	}
+
+	return image, imageType, nil
+}
+
+func applyDefaults(o Options, imageType ImageType) Options {
+	if o.Quality == 0 {
+		o.Quality = Quality
+	}
+	if o.Compression == 0 {
+		o.Compression = 6
+	}
+	if o.Type == 0 {
+		o.Type = imageType
+	}
+	if o.Interpretation == 0 {
+		o.Interpretation = InterpretationSRGB
+	}
+	return o
+}
+
+func saveImage(image *C.VipsImage, o Options) ([]byte, error) {
+	saveOptions := vipsSaveOptions{
+		Quality:        o.Quality,
+		Type:           o.Type,
+		Compression:    o.Compression,
+		Interlace:      o.Interlace,
+		NoProfile:      o.NoProfile,
+		Interpretation: o.Interpretation,
+	}
+	// Finally get the resultant buffer
+	return vipsSave(image, saveOptions)
+}
+
+func normalizeOperation(o *Options, inWidth, inHeight int) {
+	if !o.Force && !o.Crop && !o.Embed && !o.Enlarge && o.Rotate == 0 && (o.Width > 0 || o.Height > 0) {
+		o.Force = true
+	}
+}
+
+func shouldTransformImage(o Options, inWidth, inHeight int) bool {
+	return o.Force || (o.Width > 0 && o.Width != inWidth) ||
+		(o.Height > 0 && o.Height != inHeight) || o.AreaWidth > 0 || o.AreaHeight > 0
+}
+
+func shouldApplyEffects(o Options) bool {
+	return o.GaussianBlur.Sigma > 0 || o.GaussianBlur.MinAmpl > 0 || o.Sharpen.Radius > 0 && o.Sharpen.Y2 > 0 || o.Sharpen.Y3 > 0
+}
+
+func transformImage(image *C.VipsImage, o Options, shrink int, residual float64) (*C.VipsImage, error) {
+	var err error
+	// Use vips_shrink with the integral reduction
+	if shrink > 1 {
+		image, residual, err = shrinkImage(image, o, residual, shrink)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	residualx, residualy := residual, residual
+	if o.Force {
+		residualx = float64(o.Width) / float64(image.Xsize)
+		residualy = float64(o.Height) / float64(image.Ysize)
+	}
+
+	if o.Force || residual != 0 {
+		image, err = vipsAffine(image, residualx, residualy, o.Interpolator)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	if o.Force {
+		o.Crop = false
+		o.Embed = false
+	}
+
+	image, err = extractOrEmbedImage(image, o)
+	if err != nil {
+		return nil, err
+	}
+
+	debug("Transform: shrink=%v, residual=%v, interpolator=%v",
+		shrink, residual, o.Interpolator.String())
+
+	return image, nil
+}
+
+func applyEffects(image *C.VipsImage, o Options) (*C.VipsImage, error) {
+	var err error
+
+	if o.GaussianBlur.Sigma > 0 || o.GaussianBlur.MinAmpl > 0 {
+		image, err = vipsGaussianBlur(image, o.GaussianBlur)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	if o.Sharpen.Radius > 0 && o.Sharpen.Y2 > 0 || o.Sharpen.Y3 > 0 {
+		image, err = vipsSharpen(image, o.Sharpen)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	debug("Effects: gaussSigma=%v, gaussMinAmpl=%v, sharpenRadius=%v",
+		o.GaussianBlur.Sigma, o.GaussianBlur.MinAmpl, o.Sharpen.Radius)
+
+	return image, nil
+}
+
+func extractOrEmbedImage(image *C.VipsImage, o Options) (*C.VipsImage, error) {
+	var err error
+	inWidth := int(image.Xsize)
+	inHeight := int(image.Ysize)
+
+	switch {
+	case o.Gravity == GravitySmart, o.SmartCrop:
+		image, err = vipsSmartCrop(image, o.Width, o.Height)
+		break
+	case o.Crop:
+		width := int(math.Min(float64(inWidth), float64(o.Width)))
+		height := int(math.Min(float64(inHeight), float64(o.Height)))
+		left, top := calculateCrop(inWidth, inHeight, o.Width, o.Height, o.Gravity)
+		left, top = int(math.Max(float64(left), 0)), int(math.Max(float64(top), 0))
+		image, err = vipsExtract(image, left, top, width, height)
+		break
+	case o.Embed:
+		left, top := (o.Width-inWidth)/2, (o.Height-inHeight)/2
+		image, err = vipsEmbed(image, left, top, o.Width, o.Height, o.Extend, o.Background)
+		break
+
+	case o.Top != 0 || o.Left != 0 || o.AreaWidth != 0 || o.AreaHeight != 0:
+		if o.AreaWidth == 0 {
+			o.AreaHeight = o.Width
+		}
+		if o.AreaHeight == 0 {
+			o.AreaHeight = o.Height
+		}
+		if o.AreaWidth == 0 || o.AreaHeight == 0 {
+			return nil, errors.New("Extract area width/height params are required")
+		}
+		image, err = vipsExtract(image, o.Left, o.Top, o.AreaWidth, o.AreaHeight)
+		break
+	}
+
+	return image, err
+}
+
+func rotateAndFlipImage(image *C.VipsImage, o Options) (*C.VipsImage, bool, error) {
+	var err error
+	var rotated bool
+	var direction Direction = -1
+
+	if o.NoAutoRotate == false {
+		rotation, flip := calculateRotationAndFlip(image, o.Rotate)
+		if flip {
+			o.Flip = flip
+		}
+		if rotation > 0 && o.Rotate == 0 {
+			o.Rotate = rotation
+		}
+	}
+
+	if o.Rotate > 0 {
+		rotated = true
+		image, err = vipsRotate(image, getAngle(o.Rotate))
+	}
+
+	if o.Flip {
+		direction = Horizontal
+	} else if o.Flop {
+		direction = Vertical
+	}
+
+	if direction != -1 {
+		rotated = true
+		image, err = vipsFlip(image, direction)
+	}
+
+	return image, rotated, err
+}
+
+func watermarkImageWithText(image *C.VipsImage, w Watermark) (*C.VipsImage, error) {
+	if w.Text == "" {
+		return image, nil
+	}
+
+	// Defaults
+	if w.Font == "" {
+		w.Font = WatermarkFont
+	}
+	if w.Width == 0 {
+		w.Width = int(math.Floor(float64(image.Xsize / 6)))
+	}
+	if w.DPI == 0 {
+		w.DPI = 150
+	}
+	if w.Margin == 0 {
+		w.Margin = w.Width
+	}
+	if w.Opacity == 0 {
+		w.Opacity = 0.25
+	} else if w.Opacity > 1 {
+		w.Opacity = 1
+	}
+
+	image, err := vipsWatermark(image, w)
+	if err != nil {
+		return nil, err
+	}
+
+	return image, nil
+}
+
+func watermarkImageWithAnotherImage(image *C.VipsImage, w WatermarkImage) (*C.VipsImage, error) {
+
+	if len(w.Buf) == 0 {
+		return image, nil
+	}
+
+	if w.Opacity == 0.0 {
+		w.Opacity = 1.0
+	}
+
+	image, err := vipsDrawWatermark(image, w)
+
+	if err != nil {
+		return nil, err
+	}
+
+	return image, nil
+}
+
+func imageFlatten(image *C.VipsImage, imageType ImageType, o Options) (*C.VipsImage, error) {
+	// Only PNG images are supported for now
+	if imageType != PNG || o.Background == ColorBlack {
+		return image, nil
+	}
+	return vipsFlattenBackground(image, o.Background)
+}
+
+func zoomImage(image *C.VipsImage, zoom int) (*C.VipsImage, error) {
+	if zoom == 0 {
+		return image, nil
+	}
+	return vipsZoom(image, zoom+1)
+}
+
+func shrinkImage(image *C.VipsImage, o Options, residual float64, shrink int) (*C.VipsImage, float64, error) {
+	// Use vips_shrink with the integral reduction
+	image, err := vipsShrink(image, shrink)
+	if err != nil {
+		return nil, 0, err
+	}
+
+	// Recalculate residual float based on dimensions of required vs shrunk images
+	residualx := float64(o.Width) / float64(image.Xsize)
+	residualy := float64(o.Height) / float64(image.Ysize)
+
+	if o.Crop {
+		residual = math.Max(residualx, residualy)
+	} else {
+		residual = math.Min(residualx, residualy)
+	}
+
+	return image, residual, nil
+}
+
+func shrinkJpegImage(buf []byte, input *C.VipsImage, factor float64, shrink int) (*C.VipsImage, float64, error) {
+	var image *C.VipsImage
+	var err error
+	shrinkOnLoad := 1
+
+	// Recalculate integral shrink and double residual
+	switch {
+	case shrink >= 8:
+		factor = factor / 8
+		shrinkOnLoad = 8
+	case shrink >= 4:
+		factor = factor / 4
+		shrinkOnLoad = 4
+	case shrink >= 2:
+		factor = factor / 2
+		shrinkOnLoad = 2
+	}
+
+	// Reload input using shrink-on-load
+	if shrinkOnLoad > 1 {
+		image, err = vipsShrinkJpeg(buf, input, shrinkOnLoad)
+	}
+
+	return image, factor, err
+}
+
+func imageCalculations(o *Options, inWidth, inHeight int) float64 {
+	factor := 1.0
+	xfactor := float64(inWidth) / float64(o.Width)
+	yfactor := float64(inHeight) / float64(o.Height)
+
+	switch {
+	// Fixed width and height
+	case o.Width > 0 && o.Height > 0:
+		if o.Crop {
+			factor = math.Min(xfactor, yfactor)
+		} else {
+			factor = math.Max(xfactor, yfactor)
+		}
+	// Fixed width, auto height
+	case o.Width > 0:
+		if o.Crop {
+			o.Height = inHeight
+		} else {
+			factor = xfactor
+			o.Height = roundFloat(float64(inHeight) / factor)
+		}
+	// Fixed height, auto width
+	case o.Height > 0:
+		if o.Crop {
+			o.Width = inWidth
+		} else {
+			factor = yfactor
+			o.Width = roundFloat(float64(inWidth) / factor)
+		}
+	// Identity transform
+	default:
+		o.Width = inWidth
+		o.Height = inHeight
+		break
+	}
+
+	return factor
+}
+
+func roundFloat(f float64) int {
+	if f < 0 {
+		return int(math.Ceil(f - 0.5))
+	}
+	return int(math.Floor(f + 0.5))
+}
+
+func calculateCrop(inWidth, inHeight, outWidth, outHeight int, gravity Gravity) (int, int) {
+	left, top := 0, 0
+
+	switch gravity {
+	case GravityNorth:
+		left = (inWidth - outWidth + 1) / 2
+	case GravityEast:
+		left = inWidth - outWidth
+		top = (inHeight - outHeight + 1) / 2
+	case GravitySouth:
+		left = (inWidth - outWidth + 1) / 2
+		top = inHeight - outHeight
+	case GravityWest:
+		top = (inHeight - outHeight + 1) / 2
+	default:
+		left = (inWidth - outWidth + 1) / 2
+		top = (inHeight - outHeight + 1) / 2
+	}
+
+	return left, top
+}
+
+func calculateRotationAndFlip(image *C.VipsImage, angle Angle) (Angle, bool) {
+	rotate := D0
+	flip := false
+
+	if angle > 0 {
+		return rotate, flip
+	}
+
+	switch vipsExifOrientation(image) {
+	case 6:
+		rotate = D90
+		break
+	case 3:
+		rotate = D180
+		break
+	case 8:
+		rotate = D270
+		break
+	case 2:
+		flip = true
+		break // flip 1
+	case 7:
+		flip = true
+		rotate = D90
+		break // flip 6
+	case 4:
+		flip = true
+		rotate = D180
+		break // flip 3
+	case 5:
+		flip = true
+		rotate = D270
+		break // flip 8
+	}
+
+	return rotate, flip
+}
+
+func calculateShrink(factor float64, i Interpolator) int {
+	var shrink float64
+
+	// Calculate integral box shrink
+	windowSize := vipsWindowSize(i.String())
+	if factor >= 2 && windowSize > 3 {
+		// Shrink less, affine more with interpolators that use at least 4x4 pixel window, e.g. bicubic
+		shrink = float64(math.Floor(factor * 3.0 / windowSize))
+	} else {
+		shrink = math.Floor(factor)
+	}
+
+	return int(math.Max(shrink, 1))
+}
+
+func calculateResidual(factor float64, shrink int) float64 {
+	return float64(shrink) / factor
+}
+
+func getAngle(angle Angle) Angle {
+	divisor := angle % 90
+	if divisor != 0 {
+		angle = angle - divisor
+	}
+	return Angle(math.Min(float64(angle), 270))
+}

vendor/src/gopkg.in/h2non/bimg.v1/resize_test.go

@@ -0,0 +1,644 @@
+package bimg
+
+import (
+	"bytes"
+	"crypto/md5"
+	"image"
+	"image/jpeg"
+	"io/ioutil"
+	"os"
+	"path"
+	"strconv"
+	"testing"
+)
+
+func TestResize(t *testing.T) {
+	options := Options{Width: 800, Height: 600}
+	buf, _ := Read("fixtures/test.jpg")
+
+	newImg, err := Resize(buf, options)
+	if err != nil {
+		t.Errorf("Resize(imgData, %#v) error: %#v", options, err)
+	}
+
+	if DetermineImageType(newImg) != JPEG {
+		t.Fatal("Image is not jpeg")
+	}
+
+	size, _ := Size(newImg)
+	if size.Height != options.Height || size.Width != options.Width {
+		t.Fatalf("Invalid image size: %dx%d", size.Width, size.Height)
+	}
+
+	Write("fixtures/test_out.jpg", newImg)
+}
+
+func TestResizeVerticalImage(t *testing.T) {
+	tests := []struct {
+		format  ImageType
+		options Options
+	}{
+		{JPEG, Options{Width: 800, Height: 600}},
+		{JPEG, Options{Width: 1000, Height: 1000}},
+		{JPEG, Options{Width: 1000, Height: 1500}},
+		{JPEG, Options{Width: 1000}},
+		{JPEG, Options{Height: 1500}},
+		{JPEG, Options{Width: 100, Height: 50}},
+		{JPEG, Options{Width: 2000, Height: 2000}},
+		{JPEG, Options{Width: 500, Height: 1000}},
+		{JPEG, Options{Width: 500}},
+		{JPEG, Options{Height: 500}},
+		{JPEG, Options{Crop: true, Width: 500, Height: 1000}},
+		{JPEG, Options{Crop: true, Enlarge: true, Width: 2000, Height: 1400}},
+		{JPEG, Options{Enlarge: true, Force: true, Width: 2000, Height: 2000}},
+		{JPEG, Options{Force: true, Width: 2000, Height: 2000}},
+	}
+
+	buf, _ := Read("fixtures/vertical.jpg")
+	for _, test := range tests {
+		image, err := Resize(buf, test.options)
+		if err != nil {
+			t.Errorf("Resize(imgData, %#v) error: %#v", test.options, err)
+		}
+
+		if DetermineImageType(image) != test.format {
+			t.Fatalf("Image format is invalid. Expected: %#v", test.format)
+		}
+
+		size, _ := Size(image)
+		if test.options.Height > 0 && size.Height != test.options.Height {
+			t.Fatalf("Invalid height: %d", size.Height)
+		}
+		if test.options.Width > 0 && size.Width != test.options.Width {
+			t.Fatalf("Invalid width: %d", size.Width)
+		}
+
+		Write("fixtures/test_vertical_"+strconv.Itoa(test.options.Width)+"x"+strconv.Itoa(test.options.Height)+"_out.jpg", image)
+	}
+}
+
+func TestResizeCustomSizes(t *testing.T) {
+	tests := []struct {
+		format  ImageType
+		options Options
+	}{
+		{JPEG, Options{Width: 800, Height: 600}},
+		{JPEG, Options{Width: 1000, Height: 1000}},
+		{JPEG, Options{Width: 100, Height: 50}},
+		{JPEG, Options{Width: 2000, Height: 2000}},
+		{JPEG, Options{Width: 500, Height: 1000}},
+		{JPEG, Options{Width: 500}},
+		{JPEG, Options{Height: 500}},
+		{JPEG, Options{Crop: true, Width: 500, Height: 1000}},
+		{JPEG, Options{Crop: true, Enlarge: true, Width: 2000, Height: 1400}},
+		{JPEG, Options{Enlarge: true, Force: true, Width: 2000, Height: 2000}},
+		{JPEG, Options{Force: true, Width: 2000, Height: 2000}},
+	}
+
+	buf, _ := Read("fixtures/test.jpg")
+	for _, test := range tests {
+		image, err := Resize(buf, test.options)
+		if err != nil {
+			t.Errorf("Resize(imgData, %#v) error: %#v", test.options, err)
+		}
+
+		if DetermineImageType(image) != test.format {
+			t.Fatalf("Image format is invalid. Expected: %#v", test.format)
+		}
+
+		size, _ := Size(image)
+		if test.options.Height > 0 && size.Height != test.options.Height {
+			t.Fatalf("Invalid height: %d", size.Height)
+		}
+		if test.options.Width > 0 && size.Width != test.options.Width {
+			t.Fatalf("Invalid width: %d", size.Width)
+		}
+	}
+}
+
+func TestResizePrecision(t *testing.T) {
+	// see https://github.com/h2non/bimg/issues/99
+	img := image.NewGray16(image.Rect(0, 0, 1920, 1080))
+	input := &bytes.Buffer{}
+	jpeg.Encode(input, img, nil)
+
+	opts := Options{Width: 300}
+	newImg, err := Resize(input.Bytes(), opts)
+	if err != nil {
+		t.Fatalf("Resize(imgData, %#v) error: %#v", opts, err)
+	}
+
+	size, _ := Size(newImg)
+	if size.Width != opts.Width {
+		t.Fatalf("Invalid width: %d", size.Width)
+	}
+}
+
+func TestRotate(t *testing.T) {
+	options := Options{Width: 800, Height: 600, Rotate: 270, Crop: true}
+	buf, _ := Read("fixtures/test.jpg")
+
+	newImg, err := Resize(buf, options)
+	if err != nil {
+		t.Errorf("Resize(imgData, %#v) error: %#v", options, err)
+	}
+
+	if DetermineImageType(newImg) != JPEG {
+		t.Error("Image is not jpeg")
+	}
+
+	size, _ := Size(newImg)
+	if size.Width != options.Width || size.Height != options.Height {
+		t.Errorf("Invalid image size: %dx%d", size.Width, size.Height)
+	}
+
+	Write("fixtures/test_rotate_out.jpg", newImg)
+}
+
+func TestInvalidRotateDegrees(t *testing.T) {
+	options := Options{Width: 800, Height: 600, Rotate: 111, Crop: true}
+	buf, _ := Read("fixtures/test.jpg")
+
+	newImg, err := Resize(buf, options)
+	if err != nil {
+		t.Errorf("Resize(imgData, %#v) error: %#v", options, err)
+	}
+
+	if DetermineImageType(newImg) != JPEG {
+		t.Errorf("Image is not jpeg")
+	}
+
+	size, _ := Size(newImg)
+	if size.Width != options.Width || size.Height != options.Height {
+		t.Errorf("Invalid image size: %dx%d", size.Width, size.Height)
+	}
+
+	Write("fixtures/test_rotate_invalid_out.jpg", newImg)
+}
+
+func TestCorruptedImage(t *testing.T) {
+	options := Options{Width: 800, Height: 600}
+	buf, _ := Read("fixtures/corrupt.jpg")
+
+	newImg, err := Resize(buf, options)
+	if err != nil {
+		t.Errorf("Resize(imgData, %#v) error: %#v", options, err)
+	}
+
+	if DetermineImageType(newImg) != JPEG {
+		t.Fatal("Image is not jpeg")
+	}
+
+	size, _ := Size(newImg)
+	if size.Height != options.Height || size.Width != options.Width {
+		t.Fatalf("Invalid image size: %dx%d", size.Width, size.Height)
+	}
+
+	Write("fixtures/test_corrupt_out.jpg", newImg)
+}
+
+func TestNoColorProfile(t *testing.T) {
+	options := Options{Width: 800, Height: 600, NoProfile: true}
+	buf, _ := Read("fixtures/test.jpg")
+
+	newImg, err := Resize(buf, options)
+	if err != nil {
+		t.Errorf("Resize(imgData, %#v) error: %#v", options, err)
+	}
+
+	metadata, err := Metadata(newImg)
+	if metadata.Profile == true {
+		t.Fatal("Invalid profile data")
+	}
+
+	size, _ := Size(newImg)
+	if size.Height != options.Height || size.Width != options.Width {
+		t.Fatalf("Invalid image size: %dx%d", size.Width, size.Height)
+	}
+}
+
+func TestEmbedExtendColor(t *testing.T) {
+	options := Options{Width: 400, Height: 600, Crop: false, Embed: true, Extend: ExtendWhite, Background: Color{255, 20, 10}}
+	buf, _ := Read("fixtures/test_issue.jpg")
+
+	newImg, err := Resize(buf, options)
+	if err != nil {
+		t.Errorf("Resize(imgData, %#v) error: %#v", options, err)
+	}
+
+	size, _ := Size(newImg)
+	if size.Height != options.Height || size.Width != options.Width {
+		t.Fatalf("Invalid image size: %dx%d", size.Width, size.Height)
+	}
+
+	Write("fixtures/test_extend_white_out.jpg", newImg)
+}
+
+func TestEmbedExtendWithCustomColor(t *testing.T) {
+	options := Options{Width: 400, Height: 600, Crop: false, Embed: true, Extend: 5, Background: Color{255, 20, 10}}
+	buf, _ := Read("fixtures/test_issue.jpg")
+
+	newImg, err := Resize(buf, options)
+	if err != nil {
+		t.Errorf("Resize(imgData, %#v) error: %#v", options, err)
+	}
+
+	size, _ := Size(newImg)
+	if size.Height != options.Height || size.Width != options.Width {
+		t.Fatalf("Invalid image size: %dx%d", size.Width, size.Height)
+	}
+
+	Write("fixtures/test_extend_background_out.jpg", newImg)
+}
+
+func TestGaussianBlur(t *testing.T) {
+	options := Options{Width: 800, Height: 600, GaussianBlur: GaussianBlur{Sigma: 5}}
+	buf, _ := Read("fixtures/test.jpg")
+
+	newImg, err := Resize(buf, options)
+	if err != nil {
+		t.Errorf("Resize(imgData, %#v) error: %#v", options, err)
+	}
+
+	size, _ := Size(newImg)
+	if size.Height != options.Height || size.Width != options.Width {
+		t.Fatalf("Invalid image size: %dx%d", size.Width, size.Height)
+	}
+
+	Write("fixtures/test_gaussian_out.jpg", newImg)
+}
+
+func TestSharpen(t *testing.T) {
+	options := Options{Width: 800, Height: 600, Sharpen: Sharpen{Radius: 1, X1: 1.5, Y2: 20, Y3: 50, M1: 1, M2: 2}}
+	buf, _ := Read("fixtures/test.jpg")
+
+	newImg, err := Resize(buf, options)
+	if err != nil {
+		t.Errorf("Resize(imgData, %#v) error: %#v", options, err)
+	}
+
+	size, _ := Size(newImg)
+	if size.Height != options.Height || size.Width != options.Width {
+		t.Fatalf("Invalid image size: %dx%d", size.Width, size.Height)
+	}
+
+	Write("fixtures/test_sharpen_out.jpg", newImg)
+}
+
+func TestExtractWithDefaultAxis(t *testing.T) {
+	options := Options{AreaWidth: 200, AreaHeight: 200}
+	buf, _ := Read("fixtures/test.jpg")
+
+	newImg, err := Resize(buf, options)
+	if err != nil {
+		t.Errorf("Resize(imgData, %#v) error: %#v", options, err)
+	}
+
+	size, _ := Size(newImg)
+	if size.Height != options.AreaHeight || size.Width != options.AreaWidth {
+		t.Fatalf("Invalid image size: %dx%d", size.Width, size.Height)
+	}
+
+	Write("fixtures/test_extract_defaults_out.jpg", newImg)
+}
+
+func TestExtractCustomAxis(t *testing.T) {
+	options := Options{Top: 100, Left: 100, AreaWidth: 200, AreaHeight: 200}
+	buf, _ := Read("fixtures/test.jpg")
+
+	newImg, err := Resize(buf, options)
+	if err != nil {
+		t.Errorf("Resize(imgData, %#v) error: %#v", options, err)
+	}
+
+	size, _ := Size(newImg)
+	if size.Height != options.AreaHeight || size.Width != options.AreaWidth {
+		t.Fatalf("Invalid image size: %dx%d", size.Width, size.Height)
+	}
+
+	Write("fixtures/test_extract_custom_axis_out.jpg", newImg)
+}
+
+func TestConvert(t *testing.T) {
+	width, height := 300, 240
+	formats := [3]ImageType{PNG, WEBP, JPEG}
+
+	files := []string{
+		"test.jpg",
+		"test.png",
+		"test.webp",
+	}
+
+	for _, file := range files {
+		img, err := os.Open("fixtures/" + file)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		buf, err := ioutil.ReadAll(img)
+		if err != nil {
+			t.Fatal(err)
+		}
+		img.Close()
+
+		for _, format := range formats {
+			options := Options{Width: width, Height: height, Crop: true, Type: format}
+
+			newImg, err := Resize(buf, options)
+			if err != nil {
+				t.Errorf("Resize(imgData, %#v) error: %#v", options, err)
+			}
+
+			if DetermineImageType(newImg) != format {
+				t.Fatal("Image is not png")
+			}
+
+			size, _ := Size(newImg)
+			if size.Height != height || size.Width != width {
+				t.Fatalf("Invalid image size: %dx%d", size.Width, size.Height)
+			}
+		}
+	}
+}
+
+func TestResizePngWithTransparency(t *testing.T) {
+	width, height := 300, 240
+
+	options := Options{Width: width, Height: height, Crop: true}
+	img, err := os.Open("fixtures/transparent.png")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer img.Close()
+
+	buf, err := ioutil.ReadAll(img)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	newImg, err := Resize(buf, options)
+	if err != nil {
+		t.Errorf("Resize(imgData, %#v) error: %#v", options, err)
+	}
+
+	if DetermineImageType(newImg) != PNG {
+		t.Fatal("Image is not png")
+	}
+
+	size, _ := Size(newImg)
+	if size.Height != height || size.Width != width {
+		t.Fatal("Invalid image size")
+	}
+
+	Write("fixtures/transparent_out.png", newImg)
+}
+
+func TestIfBothSmartCropOptionsAreIdentical(t *testing.T) {
+	if !(VipsMajorVersion >= 8 && VipsMinorVersion > 4) {
+		t.Skipf("Skipping this test, libvips doesn't meet version requirement %s > 8.4", VipsVersion)
+	}
+
+	benchmarkOptions := Options{Width: 100, Height: 100, Crop: true}
+	smartCropOptions := Options{Width: 100, Height: 100, Crop: true, SmartCrop: true}
+	gravityOptions := Options{Width: 100, Height: 100, Crop: true, Gravity: GravitySmart}
+
+	testImg, err := os.Open("fixtures/northern_cardinal_bird.jpg")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer testImg.Close()
+
+	testImgByte, err := ioutil.ReadAll(testImg)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	scImg, err := Resize(testImgByte, smartCropOptions)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	gImg, err := Resize(testImgByte, gravityOptions)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	benchmarkImg, err := Resize(testImgByte, benchmarkOptions)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	sch, gh, bh := md5.Sum(scImg), md5.Sum(gImg), md5.Sum(benchmarkImg)
+	if gh == bh || sch == bh {
+		t.Error("Expected both options produce a different result from a standard crop.")
+	}
+
+	if sch != gh {
+		t.Errorf("Expected both options to result in the same output, %x != %x", sch, gh)
+	}
+}
+
+func runBenchmarkResize(file string, o Options, b *testing.B) {
+	buf, _ := Read(path.Join("fixtures", file))
+
+	for n := 0; n < b.N; n++ {
+		Resize(buf, o)
+	}
+}
+
+func BenchmarkRotateJpeg(b *testing.B) {
+	options := Options{Rotate: 180}
+	runBenchmarkResize("test.jpg", options, b)
+}
+
+func BenchmarkResizeLargeJpeg(b *testing.B) {
+	options := Options{
+		Width:  800,
+		Height: 600,
+	}
+	runBenchmarkResize("test.jpg", options, b)
+}
+
+func BenchmarkResizePng(b *testing.B) {
+	options := Options{
+		Width:  200,
+		Height: 200,
+	}
+	runBenchmarkResize("test.png", options, b)
+}
+
+func BenchmarkResizeWebP(b *testing.B) {
+	options := Options{
+		Width:  200,
+		Height: 200,
+	}
+	runBenchmarkResize("test.webp", options, b)
+}
+
+func BenchmarkConvertToJpeg(b *testing.B) {
+	options := Options{Type: JPEG}
+	runBenchmarkResize("test.png", options, b)
+}
+
+func BenchmarkConvertToPng(b *testing.B) {
+	options := Options{Type: PNG}
+	runBenchmarkResize("test.jpg", options, b)
+}
+
+func BenchmarkConvertToWebp(b *testing.B) {
+	options := Options{Type: WEBP}
+	runBenchmarkResize("test.jpg", options, b)
+}
+
+func BenchmarkCropJpeg(b *testing.B) {
+	options := Options{
+		Width:  800,
+		Height: 600,
+	}
+	runBenchmarkResize("test.jpg", options, b)
+}
+
+func BenchmarkCropPng(b *testing.B) {
+	options := Options{
+		Width:  800,
+		Height: 600,
+	}
+	runBenchmarkResize("test.png", options, b)
+}
+
+func BenchmarkCropWebP(b *testing.B) {
+	options := Options{
+		Width:  800,
+		Height: 600,
+	}
+	runBenchmarkResize("test.webp", options, b)
+}
+
+func BenchmarkExtractJpeg(b *testing.B) {
+	options := Options{
+		Top:        100,
+		Left:       50,
+		AreaWidth:  600,
+		AreaHeight: 480,
+	}
+	runBenchmarkResize("test.jpg", options, b)
+}
+
+func BenchmarkExtractPng(b *testing.B) {
+	options := Options{
+		Top:        100,
+		Left:       50,
+		AreaWidth:  600,
+		AreaHeight: 480,
+	}
+	runBenchmarkResize("test.png", options, b)
+}
+
+func BenchmarkExtractWebp(b *testing.B) {
+	options := Options{
+		Top:        100,
+		Left:       50,
+		AreaWidth:  600,
+		AreaHeight: 480,
+	}
+	runBenchmarkResize("test.webp", options, b)
+}
+
+func BenchmarkZoomJpeg(b *testing.B) {
+	options := Options{Zoom: 1}
+	runBenchmarkResize("test.jpg", options, b)
+}
+
+func BenchmarkZoomPng(b *testing.B) {
+	options := Options{Zoom: 1}
+	runBenchmarkResize("test.png", options, b)
+}
+
+func BenchmarkZoomWebp(b *testing.B) {
+	options := Options{Zoom: 1}
+	runBenchmarkResize("test.webp", options, b)
+}
+
+func BenchmarkWatermarkJpeg(b *testing.B) {
+	options := Options{
+		Watermark: Watermark{
+			Text:       "Chuck Norris (c) 2315",
+			Opacity:    0.25,
+			Width:      200,
+			DPI:        100,
+			Margin:     150,
+			Font:       "sans bold 12",
+			Background: Color{255, 255, 255},
+		},
+	}
+	runBenchmarkResize("test.jpg", options, b)
+}
+
+func BenchmarkWatermarPng(b *testing.B) {
+	options := Options{
+		Watermark: Watermark{
+			Text:       "Chuck Norris (c) 2315",
+			Opacity:    0.25,
+			Width:      200,
+			DPI:        100,
+			Margin:     150,
+			Font:       "sans bold 12",
+			Background: Color{255, 255, 255},
+		},
+	}
+	runBenchmarkResize("test.png", options, b)
+}
+
+func BenchmarkWatermarWebp(b *testing.B) {
+	options := Options{
+		Watermark: Watermark{
+			Text:       "Chuck Norris (c) 2315",
+			Opacity:    0.25,
+			Width:      200,
+			DPI:        100,
+			Margin:     150,
+			Font:       "sans bold 12",
+			Background: Color{255, 255, 255},
+		},
+	}
+	runBenchmarkResize("test.webp", options, b)
+}
+
+func BenchmarkWatermarkImageJpeg(b *testing.B) {
+	watermark := readFile("transparent.png")
+	options := Options{
+		WatermarkImage: WatermarkImage{
+			Buf:     watermark,
+			Opacity: 0.25,
+			Left:    100,
+			Top:     100,
+		},
+	}
+	runBenchmarkResize("test.jpg", options, b)
+}
+
+func BenchmarkWatermarImagePng(b *testing.B) {
+	watermark := readFile("transparent.png")
+	options := Options{
+		WatermarkImage: WatermarkImage{
+			Buf:     watermark,
+			Opacity: 0.25,
+			Left:    100,
+			Top:     100,
+		},
+	}
+	runBenchmarkResize("test.png", options, b)
+}
+
+func BenchmarkWatermarImageWebp(b *testing.B) {
+	watermark := readFile("transparent.png")
+	options := Options{
+		WatermarkImage: WatermarkImage{
+			Buf:     watermark,
+			Opacity: 0.25,
+			Left:    100,
+			Top:     100,
+		},
+	}
+	runBenchmarkResize("test.webp", options, b)
+}

vendor/src/gopkg.in/h2non/bimg.v1/type.go

@@ -0,0 +1,172 @@
+package bimg
+
+import (
+	"regexp"
+	"sync"
+	"unicode/utf8"
+)
+
+const (
+	// UNKNOWN represents an unknow image type value.
+	UNKNOWN ImageType = iota
+	// JPEG represents the JPEG image type.
+	JPEG
+	// WEBP represents the WEBP image type.
+	WEBP
+	// PNG represents the PNG image type.
+	PNG
+	// TIFF represents the TIFF image type.
+	TIFF
+	// GIF represents the GIF image type.
+	GIF
+	// PDF represents the PDF type.
+	PDF
+	// SVG represents the SVG image type.
+	SVG
+	// MAGICK represents the libmagick compatible genetic image type.
+	MAGICK
+)
+
+// ImageType represents an image type value.
+type ImageType int
+
+var (
+	htmlCommentRegex = regexp.MustCompile("(?i)<!--([\\s\\S]*?)-->")
+	svgRegex         = regexp.MustCompile(`(?i)^\s*(?:<\?xml[^>]*>\s*)?(?:<!doctype svg[^>]*>\s*)?<svg[^>]*>[^*]*<\/svg>\s*$`)
+)
+
+// ImageTypes stores as pairs of image types supported and its alias names.
+var ImageTypes = map[ImageType]string{
+	JPEG:   "jpeg",
+	PNG:    "png",
+	WEBP:   "webp",
+	TIFF:   "tiff",
+	GIF:    "gif",
+	PDF:    "pdf",
+	SVG:    "svg",
+	MAGICK: "magick",
+}
+
+// imageMutex is used to provide thread-safe synchronization
+// for SupportedImageTypes map.
+var imageMutex = &sync.RWMutex{}
+
+// SupportedImageType represents whether a type can be loaded and/or saved by
+// the current libvips compilation.
+type SupportedImageType struct {
+	Load bool
+	Save bool
+}
+
+// SupportedImageTypes stores the optional image type supported
+// by the current libvips compilation.
+// Note: lazy evaluation as demand is required due
+// to bootstrap runtime limitation with C/libvips world.
+var SupportedImageTypes = map[ImageType]SupportedImageType{}
+
+// discoverSupportedImageTypes is used to fill SupportedImageTypes map.
+func discoverSupportedImageTypes() {
+	imageMutex.Lock()
+	for imageType := range ImageTypes {
+		SupportedImageTypes[imageType] = SupportedImageType{
+			Load: VipsIsTypeSupported(imageType),
+			Save: VipsIsTypeSupportedSave(imageType),
+		}
+	}
+	imageMutex.Unlock()
+}
+
+// isBinary checks if the given buffer is a binary file.
+func isBinary(buf []byte) bool {
+	if len(buf) < 24 {
+		return false
+	}
+	for i := 0; i < 24; i++ {
+		charCode, _ := utf8.DecodeRuneInString(string(buf[i]))
+		if charCode == 65533 || charCode <= 8 {
+			return true
+		}
+	}
+	return false
+}
+
+// IsSVGImage returns true if the given buffer is a valid SVG image.
+func IsSVGImage(buf []byte) bool {
+	return !isBinary(buf) && svgRegex.Match(htmlCommentRegex.ReplaceAll(buf, []byte{}))
+}
+
+// DetermineImageType determines the image type format (jpeg, png, webp or tiff)
+func DetermineImageType(buf []byte) ImageType {
+	return vipsImageType(buf)
+}
+
+// DetermineImageTypeName determines the image type format by name (jpeg, png, webp or tiff)
+func DetermineImageTypeName(buf []byte) string {
+	return ImageTypeName(vipsImageType(buf))
+}
+
+// IsImageTypeSupportedByVips returns true if the given image type
+// is supported by current libvips compilation.
+func IsImageTypeSupportedByVips(t ImageType) SupportedImageType {
+	imageMutex.RLock()
+
+	// Discover supported image types and cache the result
+	itShouldDiscover := len(SupportedImageTypes) == 0
+	if itShouldDiscover {
+		imageMutex.RUnlock()
+		discoverSupportedImageTypes()
+	}
+
+	// Check if image type is actually supported
+	supported, ok := SupportedImageTypes[t]
+	if !itShouldDiscover {
+		imageMutex.RUnlock()
+	}
+
+	if ok {
+		return supported
+	}
+	return SupportedImageType{Load: false, Save: false}
+}
+
+// IsTypeSupported checks if a given image type is supported
+func IsTypeSupported(t ImageType) bool {
+	_, ok := ImageTypes[t]
+	return ok && IsImageTypeSupportedByVips(t).Load
+}
+
+// IsTypeNameSupported checks if a given image type name is supported
+func IsTypeNameSupported(t string) bool {
+	for imageType, name := range ImageTypes {
+		if name == t {
+			return IsImageTypeSupportedByVips(imageType).Load
+		}
+	}
+	return false
+}
+
+// IsTypeSupportedSave checks if a given image type is support for saving
+func IsTypeSupportedSave(t ImageType) bool {
+	_, ok := ImageTypes[t]
+	return ok && IsImageTypeSupportedByVips(t).Save
+}
+
+// IsTypeNameSupportedSave checks if a given image type name is supported for
+// saving
+func IsTypeNameSupportedSave(t string) bool {
+	for imageType, name := range ImageTypes {
+		if name == t {
+			return IsImageTypeSupportedByVips(imageType).Save
+		}
+	}
+	return false
+}
+
+// ImageTypeName is used to get the human friendly name of an image format.
+func ImageTypeName(t ImageType) string {
+	imageType := ImageTypes[t]
+	if imageType == "" {
+		return "unknown"
+	}
+	return imageType
+}

vendor/src/gopkg.in/h2non/bimg.v1/type_test.go

@@ -0,0 +1,128 @@
+package bimg
+
+import (
+	"io/ioutil"
+	"os"
+	"path"
+	"testing"
+)
+
+func TestDeterminateImageType(t *testing.T) {
+	files := []struct {
+		name     string
+		expected ImageType
+	}{
+		{"test.jpg", JPEG},
+		{"test.png", PNG},
+		{"test.webp", WEBP},
+		{"test.gif", GIF},
+		{"test.pdf", PDF},
+		{"test.svg", SVG},
+		{"test.jp2", MAGICK},
+	}
+
+	for _, file := range files {
+		img, _ := os.Open(path.Join("fixtures", file.name))
+		buf, _ := ioutil.ReadAll(img)
+		defer img.Close()
+
+		if DetermineImageType(buf) != file.expected {
+			t.Fatal("Image type is not valid")
+		}
+	}
+}
+
+func TestDeterminateImageTypeName(t *testing.T) {
+	files := []struct {
+		name     string
+		expected string
+	}{
+		{"test.jpg", "jpeg"},
+		{"test.png", "png"},
+		{"test.webp", "webp"},
+		{"test.gif", "gif"},
+		{"test.pdf", "pdf"},
+		{"test.svg", "svg"},
+		{"test.jp2", "magick"},
+	}
+
+	for _, file := range files {
+		img, _ := os.Open(path.Join("fixtures", file.name))
+		buf, _ := ioutil.ReadAll(img)
+		defer img.Close()
+
+		if DetermineImageTypeName(buf) != file.expected {
+			t.Fatal("Image type is not valid")
+		}
+	}
+}
+
+func TestIsTypeSupported(t *testing.T) {
+	types := []struct {
+		name ImageType
+	}{
+		{JPEG}, {PNG}, {WEBP}, {GIF}, {PDF},
+	}
+
+	for _, n := range types {
+		if IsTypeSupported(n.name) == false {
+			t.Fatalf("Image type %#v is not valid", ImageTypes[n.name])
+		}
+	}
+}
+
+func TestIsTypeNameSupported(t *testing.T) {
+	types := []struct {
+		name     string
+		expected bool
+	}{
+		{"jpeg", true},
+		{"png", true},
+		{"webp", true},
+		{"gif", true},
+		{"pdf", true},
+	}
+
+	for _, n := range types {
+		if IsTypeNameSupported(n.name) != n.expected {
+			t.Fatalf("Image type %#v is not valid", n.name)
+		}
+	}
+}
+
+func TestIsTypeSupportedSave(t *testing.T) {
+	types := []struct {
+		name ImageType
+	}{
+		{JPEG}, {PNG}, {WEBP},
+	}
+	if VipsVersion >= "8.5.0" {
+		types = append(types, struct{ name ImageType }{TIFF})
+	}
+
+	for _, n := range types {
+		if IsTypeSupportedSave(n.name) == false {
+			t.Fatalf("Image type %#v is not valid", ImageTypes[n.name])
+		}
+	}
+}
+
+func TestIsTypeNameSupportedSave(t *testing.T) {
+	types := []struct {
+		name     string
+		expected bool
+	}{
+		{"jpeg", true},
+		{"png", true},
+		{"webp", true},
+		{"gif", false},
+		{"pdf", false},
+		{"tiff", VipsVersion >= "8.5.0"},
+	}
+
+	for _, n := range types {
+		if IsTypeNameSupportedSave(n.name) != n.expected {
+			t.Fatalf("Image type %#v is not valid", n.name)
+		}
+	}
+}

vendor/src/gopkg.in/h2non/bimg.v1/version.go

@@ -0,0 +1,4 @@
+package bimg
+
+// Version represents the current package semantic version.
+const Version = "1.0.9"

vendor/src/gopkg.in/h2non/bimg.v1/vips.go

@@ -0,0 +1,632 @@
+package bimg
+
+/*
+#cgo pkg-config: vips
+#include "vips.h"
+*/
+import "C"
+
+import (
+	"errors"
+	"fmt"
+	"math"
+	"os"
+	"runtime"
+	"strings"
+	"sync"
+	"unsafe"
+
+	d "github.com/tj/go-debug"
+)
+
+// debug is internally used to
+var debug = d.Debug("bimg")
+
+// VipsVersion exposes the current libvips semantic version
+const VipsVersion = string(C.VIPS_VERSION)
+
+// VipsMajorVersion exposes the current libvips major version number
+const VipsMajorVersion = int(C.VIPS_MAJOR_VERSION)
+
+// VipsMinorVersion exposes the current libvips minor version number
+const VipsMinorVersion = int(C.VIPS_MINOR_VERSION)
+
+const (
+	maxCacheMem  = 100 * 1024 * 1024
+	maxCacheSize = 500
+)
+
+var (
+	m           sync.Mutex
+	initialized bool
+)
+
+// VipsMemoryInfo represents the memory stats provided by libvips.
+type VipsMemoryInfo struct {
+	Memory          int64
+	MemoryHighwater int64
+	Allocations     int64
+}
+
+// vipsSaveOptions represents the internal option used to talk with libvips.
+type vipsSaveOptions struct {
+	Quality        int
+	Compression    int
+	Type           ImageType
+	Interlace      bool
+	NoProfile      bool
+	Interpretation Interpretation
+}
+
+type vipsWatermarkOptions struct {
+	Width       C.int
+	DPI         C.int
+	Margin      C.int
+	NoReplicate C.int
+	Opacity     C.float
+	Background  [3]C.double
+}
+
+type vipsWatermarkImageOptions struct {
+	Left    C.int
+	Top     C.int
+	Opacity C.float
+}
+
+type vipsWatermarkTextOptions struct {
+	Text *C.char
+	Font *C.char
+}
+
+func init() {
+	Initialize()
+}
+
+// Initialize is used to explicitly start libvips in thread-safe way.
+// Only call this function if you have previously turned off libvips.
+func Initialize() {
+	if C.VIPS_MAJOR_VERSION <= 7 && C.VIPS_MINOR_VERSION < 40 {
+		panic("unsupported libvips version!")
+	}
+
+	m.Lock()
+	runtime.LockOSThread()
+	defer m.Unlock()
+	defer runtime.UnlockOSThread()
+
+	err := C.vips_init(C.CString("bimg"))
+	if err != 0 {
+		panic("unable to start vips!")
+	}
+
+	// Set libvips cache params
+	C.vips_cache_set_max_mem(maxCacheMem)
+	C.vips_cache_set_max(maxCacheSize)
+
+	// Define a custom thread concurrency limit in libvips (this may generate thread-unsafe issues)
+	// See: https://github.com/jcupitt/libvips/issues/261#issuecomment-92850414
+	if os.Getenv("VIPS_CONCURRENCY") == "" {
+		C.vips_concurrency_set(1)
+	}
+
+	// Enable libvips cache tracing
+	if os.Getenv("VIPS_TRACE") != "" {
+		C.vips_enable_cache_set_trace()
+	}
+
+	initialized = true
+}
+
+// Shutdown is used to shutdown libvips in a thread-safe way.
+// You can call this to drop caches as well.
+// If libvips was already initialized, the function is no-op
+func Shutdown() {
+	m.Lock()
+	defer m.Unlock()
+
+	if initialized {
+		C.vips_shutdown()
+		initialized = false
+	}
+}
+
+// VipsDebugInfo outputs to stdout libvips collected data. Useful for debugging.
+func VipsDebugInfo() {
+	C.im__print_all()
+}
+
+// VipsMemory gets memory info stats from libvips (cache size, memory allocs...)
+func VipsMemory() VipsMemoryInfo {
+	return VipsMemoryInfo{
+		Memory:          int64(C.vips_tracked_get_mem()),
+		MemoryHighwater: int64(C.vips_tracked_get_mem_highwater()),
+		Allocations:     int64(C.vips_tracked_get_allocs()),
+	}
+}
+
+// VipsIsTypeSupported returns true if the given image type
+// is supported by the current libvips compilation.
+func VipsIsTypeSupported(t ImageType) bool {
+	if t == JPEG {
+		return int(C.vips_type_find_bridge(C.JPEG)) != 0
+	}
+	if t == WEBP {
+		return int(C.vips_type_find_bridge(C.WEBP)) != 0
+	}
+	if t == PNG {
+		return int(C.vips_type_find_bridge(C.PNG)) != 0
+	}
+	if t == GIF {
+		return int(C.vips_type_find_bridge(C.GIF)) != 0
+	}
+	if t == PDF {
+		return int(C.vips_type_find_bridge(C.PDF)) != 0
+	}
+	if t == SVG {
+		return int(C.vips_type_find_bridge(C.SVG)) != 0
+	}
+	if t == TIFF {
+		return int(C.vips_type_find_bridge(C.TIFF)) != 0
+	}
+	if t == MAGICK {
+		return int(C.vips_type_find_bridge(C.MAGICK)) != 0
+	}
+	return false
+}
+
+// VipsIsTypeSupportedSave returns true if the given image type
+// is supported by the current libvips compilation for the
+// save operation.
+func VipsIsTypeSupportedSave(t ImageType) bool {
+	if t == JPEG {
+		return int(C.vips_type_find_save_bridge(C.JPEG)) != 0
+	}
+	if t == WEBP {
+		return int(C.vips_type_find_save_bridge(C.WEBP)) != 0
+	}
+	if t == PNG {
+		return int(C.vips_type_find_save_bridge(C.PNG)) != 0
+	}
+	if t == TIFF {
+		return int(C.vips_type_find_save_bridge(C.TIFF)) != 0
+	}
+	return false
+}
+
+func vipsExifOrientation(image *C.VipsImage) int {
+	return int(C.vips_exif_orientation(image))
+}
+
+func vipsHasAlpha(image *C.VipsImage) bool {
+	return int(C.has_alpha_channel(image)) > 0
+}
+
+func vipsHasProfile(image *C.VipsImage) bool {
+	return int(C.has_profile_embed(image)) > 0
+}
+
+func vipsWindowSize(name string) float64 {
+	cname := C.CString(name)
+	defer C.free(unsafe.Pointer(cname))
+	return float64(C.interpolator_window_size(cname))
+}
+
+func vipsSpace(image *C.VipsImage) string {
+	return C.GoString(C.vips_enum_nick_bridge(image))
+}
+
+func vipsRotate(image *C.VipsImage, angle Angle) (*C.VipsImage, error) {
+	var out *C.VipsImage
+	defer C.g_object_unref(C.gpointer(image))
+
+	err := C.vips_rotate(image, &out, C.int(angle))
+	if err != 0 {
+		return nil, catchVipsError()
+	}
+
+	return out, nil
+}
+
+func vipsFlip(image *C.VipsImage, direction Direction) (*C.VipsImage, error) {
+	var out *C.VipsImage
+	defer C.g_object_unref(C.gpointer(image))
+
+	err := C.vips_flip_bridge(image, &out, C.int(direction))
+	if err != 0 {
+		return nil, catchVipsError()
+	}
+
+	return out, nil
+}
+
+func vipsZoom(image *C.VipsImage, zoom int) (*C.VipsImage, error) {
+	var out *C.VipsImage
+	defer C.g_object_unref(C.gpointer(image))
+
+	err := C.vips_zoom_bridge(image, &out, C.int(zoom), C.int(zoom))
+	if err != 0 {
+		return nil, catchVipsError()
+	}
+
+	return out, nil
+}
+
+func vipsWatermark(image *C.VipsImage, w Watermark) (*C.VipsImage, error) {
+	var out *C.VipsImage
+
+	// Defaults
+	noReplicate := 0
+	if w.NoReplicate {
+		noReplicate = 1
+	}
+
+	text := C.CString(w.Text)
+	font := C.CString(w.Font)
+	background := [3]C.double{C.double(w.Background.R), C.double(w.Background.G), C.double(w.Background.B)}
+
+	textOpts := vipsWatermarkTextOptions{text, font}
+	opts := vipsWatermarkOptions{C.int(w.Width), C.int(w.DPI), C.int(w.Margin), C.int(noReplicate), C.float(w.Opacity), background}
+
+	defer C.free(unsafe.Pointer(text))
+	defer C.free(unsafe.Pointer(font))
+
+	err := C.vips_watermark(image, &out, (*C.WatermarkTextOptions)(unsafe.Pointer(&textOpts)), (*C.WatermarkOptions)(unsafe.Pointer(&opts)))
+	if err != 0 {
+		return nil, catchVipsError()
+	}
+
+	return out, nil
+}
+
+func vipsRead(buf []byte) (*C.VipsImage, ImageType, error) {
+	var image *C.VipsImage
+	imageType := vipsImageType(buf)
+
+	if imageType == UNKNOWN {
+		return nil, UNKNOWN, errors.New("Unsupported image format")
+	}
+
+	length := C.size_t(len(buf))
+	imageBuf := unsafe.Pointer(&buf[0])
+
+	err := C.vips_init_image(imageBuf, length, C.int(imageType), &image)
+	if err != 0 {
+		return nil, UNKNOWN, catchVipsError()
+	}
+
+	return image, imageType, nil
+}
+
+func vipsColourspaceIsSupportedBuffer(buf []byte) (bool, error) {
+	image, _, err := vipsRead(buf)
+	if err != nil {
+		return false, err
+	}
+	C.g_object_unref(C.gpointer(image))
+	return vipsColourspaceIsSupported(image), nil
+}
+
+func vipsColourspaceIsSupported(image *C.VipsImage) bool {
+	return int(C.vips_colourspace_issupported_bridge(image)) == 1
+}
+
+func vipsInterpretationBuffer(buf []byte) (Interpretation, error) {
+	image, _, err := vipsRead(buf)
+	if err != nil {
+		return InterpretationError, err
+	}
+	C.g_object_unref(C.gpointer(image))
+	return vipsInterpretation(image), nil
+}
+
+func vipsInterpretation(image *C.VipsImage) Interpretation {
+	return Interpretation(C.vips_image_guess_interpretation_bridge(image))
+}
+
+func vipsFlattenBackground(image *C.VipsImage, background Color) (*C.VipsImage, error) {
+	var outImage *C.VipsImage
+
+	backgroundC := [3]C.double{
+		C.double(background.R),
+		C.double(background.G),
+		C.double(background.B),
+	}
+
+	if vipsHasAlpha(image) {
+		err := C.vips_flatten_background_brigde(image, &outImage,
+			backgroundC[0], backgroundC[1], backgroundC[2])
+		if int(err) != 0 {
+			return nil, catchVipsError()
+		}
+		C.g_object_unref(C.gpointer(image))
+		image = outImage
+	}
+
+	return image, nil
+}
+
+func vipsPreSave(image *C.VipsImage, o *vipsSaveOptions) (*C.VipsImage, error) {
+	// Remove ICC profile metadata
+	if o.NoProfile {
+		C.remove_profile(image)
+	}
+
+	// Use a default interpretation and cast it to C type
+	if o.Interpretation == 0 {
+		o.Interpretation = InterpretationSRGB
+	}
+	interpretation := C.VipsInterpretation(o.Interpretation)
+
+	// Apply the proper colour space
+	var outImage *C.VipsImage
+	if vipsColourspaceIsSupported(image) {
+		err := C.vips_colourspace_bridge(image, &outImage, interpretation)
+		if int(err) != 0 {
+			return nil, catchVipsError()
+		}
+		image = outImage
+	}
+
+	return image, nil
+}
+
+func vipsSave(image *C.VipsImage, o vipsSaveOptions) ([]byte, error) {
+	defer C.g_object_unref(C.gpointer(image))
+
+	tmpImage, err := vipsPreSave(image, &o)
+	if err != nil {
+		return nil, err
+	}
+
+	// When an image has an unsupported color space, vipsPreSave
+	// returns the pointer of the image passed to it unmodified.
+	// When this occurs, we must take care to not dereference the
+	// original image a second time; we may otherwise erroneously
+	// free the object twice.
+	if tmpImage != image {
+		defer C.g_object_unref(C.gpointer(tmpImage))
+	}
+
+	length := C.size_t(0)
+	saveErr := C.int(0)
+	interlace := C.int(boolToInt(o.Interlace))
+	quality := C.int(o.Quality)
+
+	if o.Type != 0 && !IsTypeSupportedSave(o.Type) {
+		return nil, fmt.Errorf("VIPS cannot save to %#v", ImageTypes[o.Type])
+	}
+	var ptr unsafe.Pointer
+	switch o.Type {
+	case WEBP:
+		saveErr = C.vips_webpsave_bridge(tmpImage, &ptr, &length, 1, quality)
+	case PNG:
+		saveErr = C.vips_pngsave_bridge(tmpImage, &ptr, &length, 1, C.int(o.Compression), quality, interlace)
+	case TIFF:
+		saveErr = C.vips_tiffsave_bridge(tmpImage, &ptr, &length)
+	default:
+		saveErr = C.vips_jpegsave_bridge(tmpImage, &ptr, &length, 1, quality, interlace)
+	}
+
+	if int(saveErr) != 0 {
+		return nil, catchVipsError()
+	}
+
+	buf := C.GoBytes(ptr, C.int(length))
+
+	// Clean up
+	C.g_free(C.gpointer(ptr))
+	C.vips_error_clear()
+
+	return buf, nil
+}
+
+func getImageBuffer(image *C.VipsImage) ([]byte, error) {
+	var ptr unsafe.Pointer
+
+	length := C.size_t(0)
+	interlace := C.int(0)
+	quality := C.int(100)
+
+	err := C.int(0)
+	err = C.vips_jpegsave_bridge(image, &ptr, &length, 1, quality, interlace)
+	if int(err) != 0 {
+		return nil, catchVipsError()
+	}
+
+	defer C.g_free(C.gpointer(ptr))
+	defer C.vips_error_clear()
+
+	return C.GoBytes(ptr, C.int(length)), nil
+}
+
+func vipsExtract(image *C.VipsImage, left, top, width, height int) (*C.VipsImage, error) {
+	var buf *C.VipsImage
+	defer C.g_object_unref(C.gpointer(image))
+
+	if width > MaxSize || height > MaxSize {
+		return nil, errors.New("Maximum image size exceeded")
+	}
+
+	top, left = max(top), max(left)
+	err := C.vips_extract_area_bridge(image, &buf, C.int(left), C.int(top), C.int(width), C.int(height))
+	if err != 0 {
+		return nil, catchVipsError()
+	}
+
+	return buf, nil
+}
+
+func vipsSmartCrop(image *C.VipsImage, width, height int) (*C.VipsImage, error) {
+	var buf *C.VipsImage
+	defer C.g_object_unref(C.gpointer(image))
+
+	if width > MaxSize || height > MaxSize {
+		return nil, errors.New("Maximum image size exceeded")
+	}
+
+	err := C.vips_smartcrop_bridge(image, &buf, C.int(width), C.int(height))
+	if err != 0 {
+		return nil, catchVipsError()
+	}
+
+	return buf, nil
+}
+
+func vipsShrinkJpeg(buf []byte, input *C.VipsImage, shrink int) (*C.VipsImage, error) {
+	var image *C.VipsImage
+	var ptr = unsafe.Pointer(&buf[0])
+	defer C.g_object_unref(C.gpointer(input))
+
+	err := C.vips_jpegload_buffer_shrink(ptr, C.size_t(len(buf)), &image, C.int(shrink))
+	if err != 0 {
+		return nil, catchVipsError()
+	}
+
+	return image, nil
+}
+
+func vipsShrink(input *C.VipsImage, shrink int) (*C.VipsImage, error) {
+	var image *C.VipsImage
+	defer C.g_object_unref(C.gpointer(input))
+
+	err := C.vips_shrink_bridge(input, &image, C.double(float64(shrink)), C.double(float64(shrink)))
+	if err != 0 {
+		return nil, catchVipsError()
+	}
+
+	return image, nil
+}
+
+func vipsEmbed(input *C.VipsImage, left, top, width, height int, extend Extend, background Color) (*C.VipsImage, error) {
+	var image *C.VipsImage
+
+	// Max extend value, see: http://www.vips.ecs.soton.ac.uk/supported/8.4/doc/html/libvips/libvips-conversion.html#VipsExtend
+	if extend > 5 {
+		extend = ExtendBackground
+	}
+
+	defer C.g_object_unref(C.gpointer(input))
+	err := C.vips_embed_bridge(input, &image, C.int(left), C.int(top), C.int(width),
+		C.int(height), C.int(extend), C.double(background.R), C.double(background.G), C.double(background.B))
+	if err != 0 {
+		return nil, catchVipsError()
+	}
+
+	return image, nil
+}
+
+func vipsAffine(input *C.VipsImage, residualx, residualy float64, i Interpolator) (*C.VipsImage, error) {
+	var image *C.VipsImage
+	cstring := C.CString(i.String())
+	interpolator := C.vips_interpolate_new(cstring)
+
+	defer C.free(unsafe.Pointer(cstring))
+	defer C.g_object_unref(C.gpointer(input))
+	defer C.g_object_unref(C.gpointer(interpolator))
+
+	err := C.vips_affine_interpolator(input, &image, C.double(residualx), 0, 0, C.double(residualy), interpolator)
+	if err != 0 {
+		return nil, catchVipsError()
+	}
+
+	return image, nil
+}
+
+func vipsImageType(buf []byte) ImageType {
+	if len(buf) == 0 {
+		return UNKNOWN
+	}
+	if buf[0] == 0x89 && buf[1] == 0x50 && buf[2] == 0x4E && buf[3] == 0x47 {
+		return PNG
+	}
+	if buf[0] == 0xFF && buf[1] == 0xD8 && buf[2] == 0xFF {
+		return JPEG
+	}
+	if IsTypeSupported(WEBP) && buf[8] == 0x57 && buf[9] == 0x45 && buf[10] == 0x42 && buf[11] == 0x50 {
+		return WEBP
+	}
+	if IsTypeSupported(TIFF) &&
+		((buf[0] == 0x49 && buf[1] == 0x49 && buf[2] == 0x2A && buf[3] == 0x0) ||
+			(buf[0] == 0x4D && buf[1] == 0x4D && buf[2] == 0x0 && buf[3] == 0x2A)) {
+		return TIFF
+	}
+	if IsTypeSupported(GIF) && buf[0] == 0x47 && buf[1] == 0x49 && buf[2] == 0x46 {
+		return GIF
+	}
+	if IsTypeSupported(PDF) && buf[0] == 0x25 && buf[1] == 0x50 && buf[2] == 0x44 && buf[3] == 0x46 {
+		return PDF
+	}
+	if IsTypeSupported(SVG) && IsSVGImage(buf) {
+		return SVG
+	}
+	if IsTypeSupported(MAGICK) && strings.HasSuffix(readImageType(buf), "MagickBuffer") {
+		return MAGICK
+	}
+	return UNKNOWN
+}
+
+func readImageType(buf []byte) string {
+	length := C.size_t(len(buf))
+	imageBuf := unsafe.Pointer(&buf[0])
+	load := C.vips_foreign_find_load_buffer(imageBuf, length)
+	return C.GoString(load)
+}
+
+func catchVipsError() error {
+	s := C.GoString(C.vips_error_buffer())
+	C.vips_error_clear()
+	C.vips_thread_shutdown()
+	return errors.New(s)
+}
+
+func boolToInt(b bool) int {
+	if b {
+		return 1
+	}
+	return 0
+}
+
+func vipsGaussianBlur(image *C.VipsImage, o GaussianBlur) (*C.VipsImage, error) {
+	var out *C.VipsImage
+	defer C.g_object_unref(C.gpointer(image))
+
+	err := C.vips_gaussblur_bridge(image, &out, C.double(o.Sigma), C.double(o.MinAmpl))
+	if err != 0 {
+		return nil, catchVipsError()
+	}
+	return out, nil
+}
+
+func vipsSharpen(image *C.VipsImage, o Sharpen) (*C.VipsImage, error) {
+	var out *C.VipsImage
+	defer C.g_object_unref(C.gpointer(image))
+
+	err := C.vips_sharpen_bridge(image, &out, C.int(o.Radius), C.double(o.X1), C.double(o.Y2), C.double(o.Y3), C.double(o.M1), C.double(o.M2))
+	if err != 0 {
+		return nil, catchVipsError()
+	}
+	return out, nil
+}
+
+func max(x int) int {
+	return int(math.Max(float64(x), 0))
+}
+
+func vipsDrawWatermark(image *C.VipsImage, o WatermarkImage) (*C.VipsImage, error) {
+	var out *C.VipsImage
+
+	watermark, _, e := vipsRead(o.Buf)
+	if e != nil {
+		return nil, e
+	}
+
+	opts := vipsWatermarkImageOptions{C.int(o.Left), C.int(o.Top), C.float(o.Opacity)}
+
+	err := C.vips_watermark_image(image, watermark, &out, (*C.WatermarkImageOptions)(unsafe.Pointer(&opts)))
+
+	if err != 0 {
+		return nil, catchVipsError()
+	}
+
+	return out, nil
+}

vendor/src/gopkg.in/h2non/bimg.v1/vips.h

@@ -0,0 +1,532 @@
+#include <stdlib.h>
+#include <string.h>
+#include <vips/vips.h>
+#include <vips/foreign.h>
+#include <vips/vips7compat.h>
+
+/**
+ * Starting libvips 7.41, VIPS_ANGLE_x has been renamed to VIPS_ANGLE_Dx
+ * "to help python". So we provide the macro to correctly build for versions
+ * before 7.41.x.
+ * https://github.com/jcupitt/libvips/blob/master/ChangeLog#L128
+ */
+
+#if (VIPS_MAJOR_VERSION == 7 && VIPS_MINOR_VERSION < 41)
+#define VIPS_ANGLE_D0 VIPS_ANGLE_0
+#define VIPS_ANGLE_D90 VIPS_ANGLE_90
+#define VIPS_ANGLE_D180 VIPS_ANGLE_180
+#define VIPS_ANGLE_D270 VIPS_ANGLE_270
+#endif
+
+#define EXIF_IFD0_ORIENTATION "exif-ifd0-Orientation"
+
+enum types {
+	UNKNOWN = 0,
+	JPEG,
+	WEBP,
+	PNG,
+	TIFF,
+	GIF,
+	PDF,
+	SVG,
+	MAGICK
+};
+
+typedef struct {
+	const char *Text;
+	const char *Font;
+} WatermarkTextOptions;
+
+typedef struct {
+	int    Width;
+	int    DPI;
+	int    Margin;
+	int    NoReplicate;
+	float  Opacity;
+	double Background[3];
+} WatermarkOptions;
+
+typedef struct {
+	int    Left;
+	int    Top;
+	float    Opacity;
+} WatermarkImageOptions;
+
+static unsigned long
+has_profile_embed(VipsImage *image) {
+	return vips_image_get_typeof(image, VIPS_META_ICC_NAME);
+}
+
+static void
+remove_profile(VipsImage *image) {
+	vips_image_remove(image, VIPS_META_ICC_NAME);
+}
+
+static gboolean
+with_interlace(int interlace) {
+	return interlace > 0 ? TRUE : FALSE;
+}
+
+static int
+has_alpha_channel(VipsImage *image) {
+	return (
+		(image->Bands == 2 && image->Type == VIPS_INTERPRETATION_B_W) ||
+		(image->Bands == 4 && image->Type != VIPS_INTERPRETATION_CMYK) ||
+		(image->Bands == 5 && image->Type == VIPS_INTERPRETATION_CMYK)
+	) ? 1 : 0;
+}
+
+/**
+ * This method is here to handle the weird initialization of the vips lib.
+ * libvips use a macro VIPS_INIT() that call vips__init() in version < 7.41,
+ * or calls vips_init() in version >= 7.41.
+ *
+ * Anyway, it's not possible to build bimg on Debian Jessie with libvips 7.40.x,
+ * as vips_init() is a macro to VIPS_INIT(), which is also a macro, hence, cgo
+ * is unable to determine the return type of vips_init(), making the build impossible.
+ * In order to correctly build bimg, for version < 7.41, we should undef vips_init and
+ * creates a vips_init() method that calls VIPS_INIT().
+ */
+
+#if (VIPS_MAJOR_VERSION == 7 && VIPS_MINOR_VERSION < 41)
+#undef vips_init
+int
+vips_init(const char *argv0)
+{
+	return VIPS_INIT(argv0);
+}
+#endif
+
+void
+vips_enable_cache_set_trace() {
+	vips_cache_set_trace(TRUE);
+}
+
+int
+vips_affine_interpolator(VipsImage *in, VipsImage **out, double a, double b, double c, double d, VipsInterpolate *interpolator) {
+	return vips_affine(in, out, a, b, c, d, "interpolate", interpolator, NULL);
+}
+
+int
+vips_jpegload_buffer_shrink(void *buf, size_t len, VipsImage **out, int shrink) {
+	return vips_jpegload_buffer(buf, len, out, "shrink", shrink, NULL);
+}
+
+int
+vips_flip_bridge(VipsImage *in, VipsImage **out, int direction) {
+	return vips_flip(in, out, direction, NULL);
+}
+
+int
+vips_shrink_bridge(VipsImage *in, VipsImage **out, double xshrink, double yshrink) {
+	return vips_shrink(in, out, xshrink, yshrink, NULL);
+}
+
+int
+vips_type_find_bridge(int t) {
+	if (t == GIF) {
+		return vips_type_find("VipsOperation", "gifload");
+	}
+	if (t == PDF) {
+		return vips_type_find("VipsOperation", "pdfload");
+	}
+	if (t == TIFF) {
+		return vips_type_find("VipsOperation", "tiffload");
+	}
+	if (t == SVG) {
+		return vips_type_find("VipsOperation", "svgload");
+	}
+	if (t == WEBP) {
+		return vips_type_find("VipsOperation", "webpload");
+	}
+	if (t == PNG) {
+		return vips_type_find("VipsOperation", "pngload");
+	}
+	if (t == JPEG) {
+		return vips_type_find("VipsOperation", "jpegload");
+	}
+	if (t == MAGICK) {
+		return vips_type_find("VipsOperation", "magickload");
+	}
+	return 0;
+}
+
+int
+vips_type_find_save_bridge(int t) {
+	if (t == TIFF) {
+		return vips_type_find("VipsOperation", "tiffsave_buffer");
+	}
+	if (t == WEBP) {
+		return vips_type_find("VipsOperation", "webpsave_buffer");
+	}
+	if (t == PNG) {
+		return vips_type_find("VipsOperation", "pngsave_buffer");
+	}
+	if (t == JPEG) {
+		return vips_type_find("VipsOperation", "jpegsave_buffer");
+	}
+	return 0;
+}
+
+int
+vips_rotate(VipsImage *in, VipsImage **out, int angle) {
+	int rotate = VIPS_ANGLE_D0;
+
+	angle %= 360;
+
+	if (angle == 45) {
+		rotate = VIPS_ANGLE45_D45;
+	} else if (angle == 90) {
+		rotate = VIPS_ANGLE_D90;
+	} else if (angle == 135) {
+		rotate = VIPS_ANGLE45_D135;
+	} else if (angle == 180) {
+		rotate = VIPS_ANGLE_D180;
+	} else if (angle == 225) {
+		rotate = VIPS_ANGLE45_D225;
+	} else if (angle == 270) {
+		rotate = VIPS_ANGLE_D270;
+	} else if (angle == 315) {
+		rotate = VIPS_ANGLE45_D315;
+	} else {
+		angle = 0;
+	}
+
+	if (angle > 0 && angle % 90 != 0) {
+		return vips_rot45(in, out, "angle", rotate, NULL);
+	} else {
+		return vips_rot(in, out, rotate, NULL);
+	}
+}
+
+int
+vips_exif_orientation(VipsImage *image) {
+	int orientation = 0;
+	const char *exif;
+	if (
+		vips_image_get_typeof(image, EXIF_IFD0_ORIENTATION) != 0 &&
+		!vips_image_get_string(image, EXIF_IFD0_ORIENTATION, &exif)
+	) {
+		orientation = atoi(&exif[0]);
+	}
+	return orientation;
+}
+
+int
+interpolator_window_size(char const *name) {
+	VipsInterpolate *interpolator = vips_interpolate_new(name);
+	int window_size = vips_interpolate_get_window_size(interpolator);
+	g_object_unref(interpolator);
+	return window_size;
+}
+
+const char *
+vips_enum_nick_bridge(VipsImage *image) {
+	return vips_enum_nick(VIPS_TYPE_INTERPRETATION, image->Type);
+}
+
+int
+vips_zoom_bridge(VipsImage *in, VipsImage **out, int xfac, int yfac) {
+	return vips_zoom(in, out, xfac, yfac, NULL);
+}
+
+int
+vips_embed_bridge(VipsImage *in, VipsImage **out, int left, int top, int width, int height, int extend, double r, double g, double b) {
+	if (extend == VIPS_EXTEND_BACKGROUND) {
+		double background[3] = {r, g, b};
+		VipsArrayDouble *vipsBackground = vips_array_double_new(background, 3);
+		return vips_embed(in, out, left, top, width, height, "extend", extend, "background", vipsBackground, NULL);
+	}
+	return vips_embed(in, out, left, top, width, height, "extend", extend, NULL);
+}
+
+int
+vips_extract_area_bridge(VipsImage *in, VipsImage **out, int left, int top, int width, int height) {
+	return vips_extract_area(in, out, left, top, width, height, NULL);
+}
+
+int
+vips_colourspace_issupported_bridge(VipsImage *in) {
+	return vips_colourspace_issupported(in) ? 1 : 0;
+}
+
+VipsInterpretation
+vips_image_guess_interpretation_bridge(VipsImage *in) {
+	return vips_image_guess_interpretation(in);
+}
+
+int
+vips_colourspace_bridge(VipsImage *in, VipsImage **out, VipsInterpretation space) {
+	return vips_colourspace(in, out, space, NULL);
+}
+
+int
+vips_jpegsave_bridge(VipsImage *in, void **buf, size_t *len, int strip, int quality, int interlace) {
+	return vips_jpegsave_buffer(in, buf, len,
+		"strip", strip,
+		"Q", quality,
+		"optimize_coding", TRUE,
+		"interlace", with_interlace(interlace),
+		NULL
+	);
+}
+
+int
+vips_pngsave_bridge(VipsImage *in, void **buf, size_t *len, int strip, int compression, int quality, int interlace) {
+#if (VIPS_MAJOR_VERSION >= 8 || (VIPS_MAJOR_VERSION >= 7 && VIPS_MINOR_VERSION >= 42))
+	return vips_pngsave_buffer(in, buf, len,
+		"strip", FALSE,
+		"compression", compression,
+		"interlace", with_interlace(interlace),
+		"filter", VIPS_FOREIGN_PNG_FILTER_NONE,
+		NULL
+	);
+#else
+	return vips_pngsave_buffer(in, buf, len,
+		"strip", FALSE,
+		"compression", compression,
+		"interlace", with_interlace(interlace),
+		NULL
+	);
+#endif
+}
+
+int
+vips_webpsave_bridge(VipsImage *in, void **buf, size_t *len, int strip, int quality) {
+	return vips_webpsave_buffer(in, buf, len,
+		"strip", strip,
+		"Q", quality,
+		NULL
+	);
+}
+
+int
+vips_tiffsave_bridge(VipsImage *in, void **buf, size_t *len) {
+#if (VIPS_MAJOR_VERSION >= 8 && VIPS_MINOR_VERSION >= 5)
+	return vips_tiffsave_buffer(in, buf, len, NULL);
+#else
+	return 0;
+#endif
+}
+
+int
+vips_is_16bit (VipsInterpretation interpretation) {
+	return interpretation == VIPS_INTERPRETATION_RGB16 || interpretation == VIPS_INTERPRETATION_GREY16;
+}
+
+int
+vips_flatten_background_brigde(VipsImage *in, VipsImage **out, double r, double g, double b) {
+	if (vips_is_16bit(in->Type)) {
+		r = 65535 * r / 255;
+		g = 65535 * g / 255;
+		b = 65535 * b / 255;
+	}
+
+	double background[3] = {r, g, b};
+	VipsArrayDouble *vipsBackground = vips_array_double_new(background, 3);
+
+	return vips_flatten(in, out,
+		"background", vipsBackground,
+		"max_alpha", vips_is_16bit(in->Type) ? 65535.0 : 255.0,
+		NULL
+	);
+}
+
+int
+vips_init_image (void *buf, size_t len, int imageType, VipsImage **out) {
+	int code = 1;
+
+	if (imageType == JPEG) {
+		code = vips_jpegload_buffer(buf, len, out, "access", VIPS_ACCESS_RANDOM, NULL);
+	} else if (imageType == PNG) {
+		code = vips_pngload_buffer(buf, len, out, "access", VIPS_ACCESS_RANDOM, NULL);
+	} else if (imageType == WEBP) {
+		code = vips_webpload_buffer(buf, len, out, "access", VIPS_ACCESS_RANDOM, NULL);
+	} else if (imageType == TIFF) {
+		code = vips_tiffload_buffer(buf, len, out, "access", VIPS_ACCESS_RANDOM, NULL);
+#if (VIPS_MAJOR_VERSION >= 8)
+#if (VIPS_MINOR_VERSION >= 3)
+	} else if (imageType == GIF) {
+		code = vips_gifload_buffer(buf, len, out, "access", VIPS_ACCESS_RANDOM, NULL);
+	} else if (imageType == PDF) {
+		code = vips_pdfload_buffer(buf, len, out, "access", VIPS_ACCESS_RANDOM, NULL);
+	} else if (imageType == SVG) {
+		code = vips_svgload_buffer(buf, len, out, "access", VIPS_ACCESS_RANDOM, NULL);
+#endif
+	} else if (imageType == MAGICK) {
+		code = vips_magickload_buffer(buf, len, out, "access", VIPS_ACCESS_RANDOM, NULL);
+#endif
+	}
+
+	return code;
+}
+
+int
+vips_watermark_replicate (VipsImage *orig, VipsImage *in, VipsImage **out) {
+	VipsImage *cache = vips_image_new();
+
+	if (
+		vips_replicate(in, &cache,
+			1 + orig->Xsize / in->Xsize,
+			1 + orig->Ysize / in->Ysize, NULL) ||
+		vips_crop(cache, out, 0, 0, orig->Xsize, orig->Ysize, NULL)
+	) {
+		g_object_unref(cache);
+		return 1;
+	}
+
+	g_object_unref(cache);
+	return 0;
+}
+
+int
+vips_watermark(VipsImage *in, VipsImage **out, WatermarkTextOptions *to, WatermarkOptions *o) {
+	double ones[3] = { 1, 1, 1 };
+
+	VipsImage *base = vips_image_new();
+	VipsImage **t = (VipsImage **) vips_object_local_array(VIPS_OBJECT(base), 10);
+	t[0] = in;
+
+	// Make the mask.
+	if (
+		vips_text(&t[1], to->Text,
+			"width", o->Width,
+			"dpi", o->DPI,
+			"font", to->Font,
+			NULL) ||
+		vips_linear1(t[1], &t[2], o->Opacity, 0.0, NULL) ||
+		vips_cast(t[2], &t[3], VIPS_FORMAT_UCHAR, NULL) ||
+		vips_embed(t[3], &t[4], 100, 100, t[3]->Xsize + o->Margin, t[3]->Ysize + o->Margin, NULL)
+		) {
+		g_object_unref(base);
+		return 1;
+	}
+
+	// Replicate if necessary
+	if (o->NoReplicate != 1) {
+		VipsImage *cache = vips_image_new();
+		if (vips_watermark_replicate(t[0], t[4], &cache)) {
+			g_object_unref(cache);
+			g_object_unref(base);
+			return 1;
+		}
+		g_object_unref(t[4]);
+		t[4] = cache;
+	}
+
+	// Make the constant image to paint the text with.
+	if (
+		vips_black(&t[5], 1, 1, NULL) ||
+		vips_linear(t[5], &t[6], ones, o->Background, 3, NULL) ||
+		vips_cast(t[6], &t[7], VIPS_FORMAT_UCHAR, NULL) ||
+		vips_copy(t[7], &t[8], "interpretation", t[0]->Type, NULL) ||
+		vips_embed(t[8], &t[9], 0, 0, t[0]->Xsize, t[0]->Ysize, "extend", VIPS_EXTEND_COPY, NULL)
+		) {
+		g_object_unref(base);
+		return 1;
+	}
+
+	// Blend the mask and text and write to output.
+	if (vips_ifthenelse(t[4], t[9], t[0], out, "blend", TRUE, NULL)) {
+		g_object_unref(base);
+		return 1;
+	}
+
+	g_object_unref(base);
+	return 0;
+}
+
+int
+vips_gaussblur_bridge(VipsImage *in, VipsImage **out, double sigma, double min_ampl) {
+#if (VIPS_MAJOR_VERSION == 7 && VIPS_MINOR_VERSION < 41)
+	return vips_gaussblur(in, out, (int) sigma, NULL);
+#else
+	return vips_gaussblur(in, out, sigma, NULL, "min_ampl", min_ampl, NULL);
+#endif
+}
+
+int
+vips_sharpen_bridge(VipsImage *in, VipsImage **out, int radius, double x1, double y2, double y3, double m1, double m2) {
+#if (VIPS_MAJOR_VERSION == 7 && VIPS_MINOR_VERSION < 41)
+	return vips_sharpen(in, out, radius, x1, y2, y3, m1, m2, NULL);
+#else
+	return vips_sharpen(in, out, "radius", radius, "x1", x1, "y2", y2, "y3", y3, "m1", m1, "m2", m2, NULL);
+#endif
+}
+
+int
+vips_add_band(VipsImage *in, VipsImage **out, double c) {
+#if (VIPS_MAJOR_VERSION > 8 || (VIPS_MAJOR_VERSION >= 8 && VIPS_MINOR_VERSION >= 2))
+	return vips_bandjoin_const1(in, out, c, NULL);
+#else
+	VipsImage *base = vips_image_new();
+	if (
+		vips_black(&base, in->Xsize, in->Ysize, NULL) ||
+		vips_linear1(base, &base, 1, c, NULL)) {
+			g_object_unref(base);
+			return 1;
+		}
+	g_object_unref(base);
+	return vips_bandjoin2(in, base, out, c, NULL);
+#endif
+}
+
+int
+vips_watermark_image(VipsImage *in, VipsImage *sub, VipsImage **out, WatermarkImageOptions *o) {
+	VipsImage *base = vips_image_new();
+	VipsImage **t = (VipsImage **) vips_object_local_array(VIPS_OBJECT(base), 10);
+
+  // add in and sub for unreffing and later use
+	t[0] = in;
+	t[1] = sub;
+
+  if (has_alpha_channel(in) == 0) {
+		vips_add_band(in, &t[0], 255.0);
+		// in is no longer in the array and won't be unreffed, so add it at the end
+		t[8] = in;
+	}
+
+	if (has_alpha_channel(sub) == 0) {
+		vips_add_band(sub, &t[1], 255.0);
+		// sub is no longer in the array and won't be unreffed, so add it at the end
+		t[9] = sub;
+	}
+
+	// Place watermark image in the right place and size it to the size of the
+	// image that should be watermarked
+	if (
+		vips_embed(t[1], &t[2], o->Left, o->Top, t[0]->Xsize, t[0]->Ysize, NULL)) {
+			g_object_unref(base);
+		return 1;
+	}
+
+	// Create a mask image based on the alpha band from the watermark image
+	// and place it in the right position
+	if (
+		vips_extract_band(t[1], &t[3], t[1]->Bands - 1, "n", 1, NULL) ||
+		vips_linear1(t[3], &t[4], o->Opacity, 0.0, NULL) ||
+		vips_cast(t[4], &t[5], VIPS_FORMAT_UCHAR, NULL) ||
+		vips_copy(t[5], &t[6], "interpretation", t[0]->Type, NULL) ||
+		vips_embed(t[6], &t[7], o->Left, o->Top, t[0]->Xsize, t[0]->Ysize, NULL))	{
+			g_object_unref(base);
+		return 1;
+	}
+
+	// Blend the mask and watermark image and write to output.
+	if (vips_ifthenelse(t[7], t[2], t[0], out, "blend", TRUE, NULL)) {
+		g_object_unref(base);
+		return 1;
+	}
+
+	g_object_unref(base);
+	return 0;
+}
+
+int
+vips_smartcrop_bridge(VipsImage *in, VipsImage **out, int width, int height) {
+#if (VIPS_MAJOR_VERSION >= 8 && VIPS_MINOR_VERSION >= 5)
+	return vips_smartcrop(in, out, width, height, NULL);
+#else
+	return 0;
+#endif
+}

vendor/src/gopkg.in/h2non/bimg.v1/vips_test.go

@@ -0,0 +1,163 @@
+package bimg
+
+import (
+	"io/ioutil"
+	"os"
+	"path"
+	"testing"
+)
+
+func TestVipsRead(t *testing.T) {
+	files := []struct {
+		name     string
+		expected ImageType
+	}{
+		{"test.jpg", JPEG},
+		{"test.png", PNG},
+		{"test.webp", WEBP},
+	}
+
+	for _, file := range files {
+		image, imageType, _ := vipsRead(readImage(file.name))
+		if image == nil {
+			t.Fatal("Empty image")
+		}
+		if imageType != file.expected {
+			t.Fatal("Invalid image type")
+		}
+	}
+}
+
+func TestVipsSave(t *testing.T) {
+	types := [...]ImageType{JPEG, PNG, WEBP}
+
+	for _, typ := range types {
+		image, _, _ := vipsRead(readImage("test.jpg"))
+		options := vipsSaveOptions{Quality: 95, Type: typ}
+
+		buf, err := vipsSave(image, options)
+		if err != nil {
+			t.Fatalf("Cannot save the image as '%v'", ImageTypes[typ])
+		}
+		if len(buf) == 0 {
+			t.Fatalf("Empty saved '%v' image", ImageTypes[typ])
+		}
+	}
+}
+
+func TestVipsSaveTiff(t *testing.T) {
+	if !IsTypeSupportedSave(TIFF) {
+		t.Skipf("Format %#v is not supported", ImageTypes[TIFF])
+	}
+	image, _, _ := vipsRead(readImage("test.jpg"))
+	options := vipsSaveOptions{Quality: 95, Type: TIFF}
+	buf, _ := vipsSave(image, options)
+
+	if len(buf) == 0 {
+		t.Fatalf("Empty saved '%v' image", ImageTypes[TIFF])
+	}
+}
+
+func TestVipsRotate(t *testing.T) {
+	files := []struct {
+		name   string
+		rotate Angle
+	}{
+		{"test.jpg", D90},
+		{"test_square.jpg", D45},
+	}
+
+	for _, file := range files {
+		image, _, _ := vipsRead(readImage(file.name))
+
+		newImg, err := vipsRotate(image, file.rotate)
+		if err != nil {
+			t.Fatal("Cannot rotate the image")
+		}
+
+		buf, _ := vipsSave(newImg, vipsSaveOptions{Quality: 95})
+		if len(buf) == 0 {
+			t.Fatal("Empty image")
+		}
+	}
+}
+
+func TestVipsZoom(t *testing.T) {
+	image, _, _ := vipsRead(readImage("test.jpg"))
+
+	newImg, err := vipsZoom(image, 1)
+	if err != nil {
+		t.Fatal("Cannot save the image")
+	}
+
+	buf, _ := vipsSave(newImg, vipsSaveOptions{Quality: 95})
+	if len(buf) == 0 {
+		t.Fatal("Empty image")
+	}
+}
+
+func TestVipsWatermark(t *testing.T) {
+	image, _, _ := vipsRead(readImage("test.jpg"))
+
+	watermark := Watermark{
+		Text:       "Copy me if you can",
+		Font:       "sans bold 12",
+		Opacity:    0.5,
+		Width:      200,
+		DPI:        100,
+		Margin:     100,
+		Background: Color{255, 255, 255},
+	}
+
+	newImg, err := vipsWatermark(image, watermark)
+	if err != nil {
+		t.Errorf("Cannot add watermark: %s", err)
+	}
+
+	buf, _ := vipsSave(newImg, vipsSaveOptions{Quality: 95})
+	if len(buf) == 0 {
+		t.Fatal("Empty image")
+	}
+}
+
+func TestVipsWatermarkWithImage(t *testing.T) {
+	image, _, _ := vipsRead(readImage("test.jpg"))
+
+	watermark := readImage("transparent.png")
+
+	options := WatermarkImage{Left: 100, Top: 100, Opacity: 1.0, Buf: watermark}
+	newImg, err := vipsDrawWatermark(image, options)
+	if err != nil {
+		t.Errorf("Cannot add watermark: %s", err)
+	}
+
+	buf, _ := vipsSave(newImg, vipsSaveOptions{Quality: 95})
+	if len(buf) == 0 {
+		t.Fatal("Empty image")
+	}
+}
+
+func TestVipsImageType(t *testing.T) {
+	imgType := vipsImageType(readImage("test.jpg"))
+	if imgType != JPEG {
+		t.Fatal("Invalid image type")
+	}
+}
+
+func TestVipsMemory(t *testing.T) {
+	mem := VipsMemory()
+
+	if mem.Memory < 1024 {
+		t.Fatal("Invalid memory")
+	}
+	if mem.Allocations == 0 {
+		t.Fatal("Invalid memory allocations")
+	}
+}
+
+func readImage(file string) []byte {
+	img, _ := os.Open(path.Join("fixtures", file))
+	buf, _ := ioutil.ReadAll(img)
+	defer img.Close()
+	return buf
+}