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Use offscreen bitmap buffer to draw gesture preview trail

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Bug: 7042741
Change-Id: Ie3d7054e786938dc501c7aa2ffc96b5924a7967b
This commit is contained in:
Tadashi G. Takaoka 2012-09-12 16:28:54 +09:00
parent 64c65ce6d7
commit 9ad4b2a894
3 changed files with 55 additions and 24 deletions
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14
java/src/com/android/inputmethod/keyboard/KeyboardView.java
View file

@ -182,7 +182,7 @@ public class KeyboardView extends View implements PointerTracker.DrawingProxy {
private final Region mClipRegion = new Region();
private Bitmap mOffscreenBuffer;
/** The canvas for the above mutable keyboard bitmap */
private Canvas mOffscreenCanvas;
private final Canvas mOffscreenCanvas = new Canvas();
private final Paint mPaint = new Paint();
private final Paint.FontMetrics mFontMetrics = new Paint.FontMetrics();
// This sparse array caches key label text height in pixel indexed by key label text size.
@ -365,7 +365,8 @@ public class KeyboardView extends View implements PointerTracker.DrawingProxy {
if (bufferNeedsUpdates || mOffscreenBuffer == null) {
if (maybeAllocateOffscreenBuffer()) {
mInvalidateAllKeys = true;
maybeCreateOffscreenCanvas();
// TODO: Stop using the offscreen canvas even when in software rendering
mOffscreenCanvas.setBitmap(mOffscreenBuffer);
}
onDrawKeyboard(mOffscreenCanvas);
}
@ -394,15 +395,6 @@ public class KeyboardView extends View implements PointerTracker.DrawingProxy {
}
}
private void maybeCreateOffscreenCanvas() {
// TODO: Stop using the offscreen canvas even when in software rendering
if (mOffscreenCanvas != null) {
mOffscreenCanvas.setBitmap(mOffscreenBuffer);
} else {
mOffscreenCanvas = new Canvas(mOffscreenBuffer);
}
}
private void onDrawKeyboard(final Canvas canvas) {
if (mKeyboard == null) return;

25
java/src/com/android/inputmethod/keyboard/internal/GesturePreviewTrail.java
View file

@ -17,9 +17,7 @@ package com.android.inputmethod.keyboard.internal;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.Xfermode;
import android.graphics.Rect;
import android.os.SystemClock;
import com.android.inputmethod.latin.Constants;
@ -118,17 +116,16 @@ final class GesturePreviewTrail {
/ params.mTrailLingerDuration, 0.0f);
}
private final static Xfermode PORTER_DUFF_MODE_SRC =
new PorterDuffXfermode(PorterDuff.Mode.SRC);
/**
* Draw gesture preview trail
* @param canvas The canvas to draw the gesture preview trail
* @param paint The paint object to be used to draw the gesture preview trail
* @param outBoundsRect the bounding box of this gesture trail drawing
* @param params The drawing parameters of gesture preview trail
* @return true if some gesture preview trails remain to be drawn
*/
public boolean drawGestureTrail(final Canvas canvas, final Paint paint, final Params params) {
public boolean drawGestureTrail(final Canvas canvas, final Paint paint,
final Rect outBoundsRect, final Params params) {
final int trailSize = mEventTimes.getLength();
if (trailSize == 0) {
return false;
@ -149,12 +146,14 @@ final class GesturePreviewTrail {
mTrailStartIndex = startIndex;
if (startIndex < trailSize) {
int lastX = getXCoordValue(xCoords[startIndex]);
int lastY = yCoords[startIndex];
paint.setColor(params.mTrailColor);
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeCap(Paint.Cap.ROUND);
paint.setXfermode(PORTER_DUFF_MODE_SRC);
int lastX = getXCoordValue(xCoords[startIndex]);
int lastY = yCoords[startIndex];
float maxWidth = getWidth(sinceDown - eventTimes[startIndex], params);
// Initialize bounds rectangle.
outBoundsRect.set(lastX, lastY, lastX, lastY);
for (int i = startIndex + 1; i < trailSize - 1; i++) {
final int x = xCoords[i];
final int y = yCoords[i];
@ -166,10 +165,16 @@ final class GesturePreviewTrail {
final float width = getWidth(elapsedTime, params);
paint.setStrokeWidth(width);
canvas.drawLine(lastX, lastY, x, y, paint);
// Take union for the bounds.
outBoundsRect.union(x, y);
maxWidth = Math.max(maxWidth, width);
}
lastX = getXCoordValue(x);
lastY = y;
}
// Take care of trail line width.
final int inset = -((int)maxWidth + 1);
outBoundsRect.inset(inset, inset);
}
final int newSize = trailSize - startIndex;

40
java/src/com/android/inputmethod/keyboard/internal/PreviewPlacerView.java
View file

@ -18,7 +18,9 @@ package com.android.inputmethod.keyboard.internal;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.Align;
import android.graphics.PorterDuff;
@ -54,6 +56,10 @@ public class PreviewPlacerView extends RelativeLayout {
private final Params mGesturePreviewTrailParams;
private final Paint mGesturePaint;
private boolean mDrawsGesturePreviewTrail;
private Bitmap mOffscreenBuffer;
private final Canvas mOffscreenCanvas = new Canvas();
private final Rect mOffscreenDirtyRect = new Rect();
private final Rect mGesturePreviewTrailBoundsRect = new Rect(); // per trail
private final Paint mTextPaint;
private String mGestureFloatingPreviewText;
@ -154,6 +160,7 @@ public class PreviewPlacerView extends RelativeLayout {
final Paint gesturePaint = new Paint();
gesturePaint.setAntiAlias(true);
gesturePaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC));
mGesturePaint = gesturePaint;
final Paint textPaint = new Paint();
@ -198,11 +205,31 @@ public class PreviewPlacerView extends RelativeLayout {
invalidate();
}
@Override
protected void onDetachedFromWindow() {
if (mOffscreenBuffer != null) {
mOffscreenBuffer.recycle();
mOffscreenBuffer = null;
}
}
@Override
public void onDraw(final Canvas canvas) {
super.onDraw(canvas);
canvas.translate(mXOrigin, mYOrigin);
if (mDrawsGesturePreviewTrail) {
if (mOffscreenBuffer == null) {
mOffscreenBuffer = Bitmap.createBitmap(
getWidth(), getHeight(), Bitmap.Config.ARGB_8888);
mOffscreenCanvas.setBitmap(mOffscreenBuffer);
}
if (!mOffscreenDirtyRect.isEmpty()) {
// Clear previous dirty rectangle.
mGesturePaint.setColor(Color.TRANSPARENT);
mGesturePaint.setStyle(Paint.Style.FILL);
mOffscreenCanvas.drawRect(mOffscreenDirtyRect, mGesturePaint);
mOffscreenDirtyRect.setEmpty();
}
boolean needsUpdatingGesturePreviewTrail = false;
synchronized (mGesturePreviewTrails) {
// Trails count == fingers count that have ever been active.
@ -210,10 +237,18 @@ public class PreviewPlacerView extends RelativeLayout {
for (int index = 0; index < trailsCount; index++) {
final GesturePreviewTrail trail = mGesturePreviewTrails.valueAt(index);
needsUpdatingGesturePreviewTrail |=
trail.drawGestureTrail(canvas, mGesturePaint,
mGesturePreviewTrailParams);
trail.drawGestureTrail(mOffscreenCanvas, mGesturePaint,
mGesturePreviewTrailBoundsRect, mGesturePreviewTrailParams);
// {@link #mGesturePreviewTrailBoundsRect} has bounding box of the trail.
mOffscreenDirtyRect.union(mGesturePreviewTrailBoundsRect);
}
}
if (!mOffscreenDirtyRect.isEmpty()) {
canvas.drawBitmap(mOffscreenBuffer, mOffscreenDirtyRect, mOffscreenDirtyRect,
mGesturePaint);
// Note: Defer clearing the dirty rectangle here because we will get cleared
// rectangle on the canvas.
}
if (needsUpdatingGesturePreviewTrail) {
mDrawingHandler.postUpdateGestureTrailPreview();
}
@ -263,7 +298,6 @@ public class PreviewPlacerView extends RelativeLayout {
final float round = mGestureFloatingPreviewRoundRadius;
paint.setColor(mGestureFloatingPreviewColor);
canvas.drawRoundRect(rectangle, round, round, paint);
// Paint the text preview
paint.setColor(mGestureFloatingPreviewTextColor);
final float textX = rectX + hPad + textWidth / 2.0f;