Clean up in geometry_utils.h

Change-Id: I876bceed12cf533cb29d290fbc05a686f4030579

native/jni/src/defines.h

@@ -392,6 +392,8 @@ static inline void prof_out(void) {
 template<typename T> inline T min(T a, T b) { return a < b ? a : b; }
 template<typename T> inline T max(T a, T b) { return a > b ? a : b; }
 
+#define M_PI_F 3.14159265f
+
 #define NELEMS(x) (sizeof(x) / sizeof((x)[0]))
 
 // The ratio of neutral area radius to sweet spot radius.

native/jni/src/geometry_utils.h

@@ -21,7 +21,6 @@
 
 #include "defines.h"
 
-#define M_PI_F 3.14159265f
 #define ROUND_FLOAT_10000(f) ((f) < 1000.0f && (f) > 0.001f) \
         ? (floorf((f) * 10000.0f) / 10000.0f) : (f)
 
@@ -29,15 +28,6 @@ namespace latinime {
 
 static inline float SQUARE_FLOAT(const float x) { return x * x; }
 
-static inline float getSquaredDistanceFloat(const float x1, const float y1, const float x2,
-        const float y2) {
-    return SQUARE_FLOAT(x1 - x2) + SQUARE_FLOAT(y1 - y2);
-}
-
-static AK_FORCE_INLINE int getDistanceInt(const int x1, const int y1, const int x2, const int y2) {
-    return static_cast<int>(hypotf(static_cast<float>(x1 - x2), static_cast<float>(y1 - y2)));
-}
-
 static AK_FORCE_INLINE float getAngle(const int x1, const int y1, const int x2, const int y2) {
     const int dx = x1 - x2;
     const int dy = y1 - y2;
@@ -54,52 +44,5 @@ static AK_FORCE_INLINE float getAngleDiff(const float a1, const float a2) {
     }
     return diff;
 }
-
-static inline float pointToLineSegSquaredDistanceFloat(const float x, const float y, const float x1,
-        const float y1, const float x2, const float y2, const bool extend) {
-    const float ray1x = x - x1;
-    const float ray1y = y - y1;
-    const float ray2x = x2 - x1;
-    const float ray2y = y2 - y1;
-
-    const float dotProduct = ray1x * ray2x + ray1y * ray2y;
-    const float lineLengthSqr = SQUARE_FLOAT(ray2x) + SQUARE_FLOAT(ray2y);
-    const float projectionLengthSqr = dotProduct / lineLengthSqr;
-
-    float projectionX;
-    float projectionY;
-    if (!extend && projectionLengthSqr < 0.0f) {
-        projectionX = x1;
-        projectionY = y1;
-    } else if (!extend && projectionLengthSqr > 1.0f) {
-        projectionX = x2;
-        projectionY = y2;
-    } else {
-        projectionX = x1 + projectionLengthSqr * ray2x;
-        projectionY = y1 + projectionLengthSqr * ray2y;
-    }
-    return getSquaredDistanceFloat(x, y, projectionX, projectionY);
-}
-
-// Normal distribution N(u, sigma^2).
-struct NormalDistribution {
- public:
-    NormalDistribution(const float u, const float sigma)
-            : mU(u), mSigma(sigma),
-              mPreComputedNonExpPart(1.0f / sqrtf(2.0f * M_PI_F * SQUARE_FLOAT(sigma))),
-              mPreComputedExponentPart(-1.0f / (2.0f * SQUARE_FLOAT(sigma))) {}
-
-    float getProbabilityDensity(const float x) const {
-        const float shiftedX = x - mU;
-        return mPreComputedNonExpPart * expf(mPreComputedExponentPart * SQUARE_FLOAT(shiftedX));
-    }
-
-private:
-    DISALLOW_IMPLICIT_CONSTRUCTORS(NormalDistribution);
-    const float mU; // mean value
-    const float mSigma; // standard deviation
-    const float mPreComputedNonExpPart; // = 1 / sqrt(2 * PI * sigma^2)
-    const float mPreComputedExponentPart; // = -1 / (2 * sigma^2)
-}; // struct NormalDistribution
 } // namespace latinime
 #endif // LATINIME_GEOMETRY_UTILS_H

native/jni/src/proximity_info.cpp

@@ -140,7 +140,8 @@ float ProximityInfo::getNormalizedSquaredDistanceFromCenterFloatG(
     const float touchX = static_cast<float>(x);
     const float touchY = static_cast<float>(y);
     const float keyWidth = static_cast<float>(getMostCommonKeyWidth());
-    return getSquaredDistanceFloat(centerX, centerY, touchX, touchY) / SQUARE_FLOAT(keyWidth);
+    return ProximityInfoUtils::getSquaredDistanceFloat(centerX, centerY, touchX, touchY)
+            / SQUARE_FLOAT(keyWidth);
 }
 
 int ProximityInfo::getCodePointOf(const int keyIndex) const {
@@ -163,7 +164,7 @@ void ProximityInfo::initializeG() {
     for (int i = 0; i < KEY_COUNT; i++) {
         mKeyKeyDistancesG[i][i] = 0;
         for (int j = i + 1; j < KEY_COUNT; j++) {
-            mKeyKeyDistancesG[i][j] = getDistanceInt(
+            mKeyKeyDistancesG[i][j] = ProximityInfoUtils::getDistanceInt(
                     mCenterXsG[i], mCenterYsG[i], mCenterXsG[j], mCenterYsG[j]);
             mKeyKeyDistancesG[j][i] = mKeyKeyDistancesG[i][j];
         }

native/jni/src/proximity_info.h

@@ -71,10 +71,6 @@ class ProximityInfo {
         return MOST_COMMON_KEY_WIDTH_SQUARE;
     }
 
-    const char *getLocaleStr() const {
-        return mLocaleStr;
-    }
-
     int getKeyCount() const {
         return KEY_COUNT;
     }

native/jni/src/proximity_info_state.cpp

@@ -23,6 +23,7 @@
 #include "geometry_utils.h"
 #include "proximity_info.h"
 #include "proximity_info_state.h"
+#include "proximity_info_utils.h"
 
 namespace latinime {
 
@@ -46,7 +47,6 @@ void ProximityInfoState::initInputParams(const int pointerId, const float maxPoi
     mProximityInfo = proximityInfo;
     mHasTouchPositionCorrectionData = proximityInfo->hasTouchPositionCorrectionData();
     mMostCommonKeyWidthSquare = proximityInfo->getMostCommonKeyWidthSquare();
-    mLocaleStr = proximityInfo->getLocaleStr();
     mKeyCount = proximityInfo->getKeyCount();
     mCellHeight = proximityInfo->getCellHeight();
     mCellWidth = proximityInfo->getCellWidth();
@@ -324,7 +324,7 @@ void ProximityInfoState::refreshSpeedRates(const int inputSize, const int *const
             if (i < mSampledInputSize - 1 && j >= mInputIndice[i + 1]) {
                 break;
             }
-            length += getDistanceInt(xCoordinates[j], yCoordinates[j],
+            length += ProximityInfoUtils::getDistanceInt(xCoordinates[j], yCoordinates[j],
                     xCoordinates[j + 1], yCoordinates[j + 1]);
             duration += times[j + 1] - times[j];
         }
@@ -333,7 +333,7 @@ void ProximityInfoState::refreshSpeedRates(const int inputSize, const int *const
                 break;
             }
             // TODO: use mLengthCache instead?
-            length += getDistanceInt(xCoordinates[j], yCoordinates[j],
+            length += ProximityInfoUtils::getDistanceInt(xCoordinates[j], yCoordinates[j],
                     xCoordinates[j + 1], yCoordinates[j + 1]);
             duration += times[j + 1] - times[j];
         }
@@ -388,7 +388,8 @@ float ProximityInfoState::calculateBeelineSpeedRate(
     while (start > 0 && tempBeelineDistance < lookupRadius) {
         tempTime += times[start] - times[start - 1];
         --start;
-        tempBeelineDistance = getDistanceInt(x0, y0, xCoordinates[start], yCoordinates[start]);
+        tempBeelineDistance = ProximityInfoUtils::getDistanceInt(x0, y0, xCoordinates[start],
+                yCoordinates[start]);
     }
     // Exclusive unless this is an edge point
     if (start > 0 && start < actualInputIndex) {
@@ -401,7 +402,8 @@ float ProximityInfoState::calculateBeelineSpeedRate(
     while (end < (inputSize - 1) && tempBeelineDistance < lookupRadius) {
         tempTime += times[end + 1] - times[end];
         ++end;
-        tempBeelineDistance = getDistanceInt(x0, y0, xCoordinates[end], yCoordinates[end]);
+        tempBeelineDistance = ProximityInfoUtils::getDistanceInt(x0, y0, xCoordinates[end],
+                 yCoordinates[end]);
     }
     // Exclusive unless this is an edge point
     if (end > actualInputIndex && end < (inputSize - 1)) {
@@ -419,7 +421,7 @@ float ProximityInfoState::calculateBeelineSpeedRate(
     const int y2 = yCoordinates[start];
     const int x3 = xCoordinates[end];
     const int y3 = yCoordinates[end];
-    const int beelineDistance = getDistanceInt(x2, y2, x3, y3);
+    const int beelineDistance = ProximityInfoUtils::getDistanceInt(x2, y2, x3, y3);
     int adjustedStartTime = times[start];
     if (start == 0 && actualInputIndex == 0 && inputSize > 1) {
         adjustedStartTime += FIRST_POINT_TIME_OFFSET_MILLIS;
@@ -539,7 +541,8 @@ float ProximityInfoState::getPointScore(
     }
 
     const int baseSampleRate = mProximityInfo->getMostCommonKeyWidth();
-    const int distPrev = getDistanceInt(mSampledInputXs.back(), mSampledInputYs.back(),
+    const int distPrev = ProximityInfoUtils::getDistanceInt(
+            mSampledInputXs.back(), mSampledInputYs.back(),
             mSampledInputXs[size - 2], mSampledInputYs[size - 2]) * DISTANCE_BASE_SCALE;
     float score = 0.0f;
 
@@ -590,13 +593,15 @@ bool ProximityInfoState::pushTouchPoint(const int inputIndex, const int nodeCode
         }
         // Check if the last point should be skipped.
         if (isLastPoint && size > 0) {
-            if (getDistanceInt(x, y, mSampledInputXs.back(), mSampledInputYs.back())
+            if (ProximityInfoUtils::getDistanceInt(x, y, mSampledInputXs.back(),
-                    * LAST_POINT_SKIP_DISTANCE_SCALE < mProximityInfo->getMostCommonKeyWidth()) {
+                    mSampledInputYs.back()) * LAST_POINT_SKIP_DISTANCE_SCALE
+                            < mProximityInfo->getMostCommonKeyWidth()) {
                 // This point is not used because it's too close to the previous point.
                 if (DEBUG_GEO_FULL) {
                     AKLOGI("p0: size = %zd, x = %d, y = %d, lx = %d, ly = %d, dist = %d, "
                            "width = %d", size, x, y, mSampledInputXs.back(), mSampledInputYs.back(),
-                           getDistanceInt(x, y, mSampledInputXs.back(), mSampledInputYs.back()),
+                           ProximityInfoUtils::getDistanceInt(x, y, mSampledInputXs.back(),
+                                   mSampledInputYs.back()),
                            mProximityInfo->getMostCommonKeyWidth()
                                    / LAST_POINT_SKIP_DISTANCE_SCALE);
                 }
@@ -616,7 +621,7 @@ bool ProximityInfoState::pushTouchPoint(const int inputIndex, const int nodeCode
     // Pushing point information.
     if (size > 0) {
         mLengthCache.push_back(
-                mLengthCache.back() + getDistanceInt(
+                mLengthCache.back() + ProximityInfoUtils::getDistanceInt(
                         x, y, mSampledInputXs.back(), mSampledInputYs.back()));
     } else {
         mLengthCache.push_back(0);
@@ -867,7 +872,8 @@ float ProximityInfoState::getLineToKeyDistance(
     const int keyX = mProximityInfo->getKeyCenterXOfKeyIdG(keyId);
     const int keyY = mProximityInfo->getKeyCenterYOfKeyIdG(keyId);
 
-    return pointToLineSegSquaredDistanceFloat(keyX, keyY, x0, y0, x1, y1, extend);
+    return ProximityInfoUtils::pointToLineSegSquaredDistanceFloat(
+            keyX, keyY, x0, y0, x1, y1, extend);
 }
 
 // Updates probabilities of aligning to some keys and skipping.
@@ -986,7 +992,8 @@ void ProximityInfoState::updateAlignPointProbabilities(const int start) {
                         MAX_SPEEDxNEAREST_RATE_FOR_STANDERD_DIVIATION);
         const float sigma = speedxAngleRate + speedxNearestKeyDistanceRate + MIN_STANDERD_DIVIATION;
 
-        NormalDistribution distribution(CENTER_VALUE_OF_NORMALIZED_DISTRIBUTION, sigma);
+        ProximityInfoUtils::NormalDistribution
+                distribution(CENTER_VALUE_OF_NORMALIZED_DISTRIBUTION, sigma);
         static const float PREV_DISTANCE_WEIGHT = 0.5f;
         static const float NEXT_DISTANCE_WEIGHT = 0.6f;
         // Summing up probability densities of all near keys.

native/jni/src/proximity_info_state.h

@@ -19,7 +19,6 @@
 
 #include <bitset>
 #include <cstring> // for memset()
-#include <string>
 #include <vector>
 
 #include "char_utils.h"
@@ -55,7 +54,7 @@ class ProximityInfoState {
     /////////////////////////////////////////
     AK_FORCE_INLINE ProximityInfoState()
             : mProximityInfo(0), mMaxPointToKeyLength(0.0f), mAverageSpeed(0.0f),
-              mHasTouchPositionCorrectionData(false), mMostCommonKeyWidthSquare(0), mLocaleStr(),
+              mHasTouchPositionCorrectionData(false), mMostCommonKeyWidthSquare(0),
               mKeyCount(0), mCellHeight(0), mCellWidth(0), mGridHeight(0), mGridWidth(0),
               mIsContinuationPossible(false), mSampledInputXs(), mSampledInputYs(), mTimes(),
               mInputIndice(), mLengthCache(), mBeelineSpeedPercentiles(), mDistanceCache_G(),
@@ -262,7 +261,6 @@ class ProximityInfoState {
     float mAverageSpeed;
     bool mHasTouchPositionCorrectionData;
     int mMostCommonKeyWidthSquare;
-    std::string mLocaleStr;
     int mKeyCount;
     int mCellHeight;
     int mCellWidth;

native/jni/src/proximity_info_utils.h

@@ -17,9 +17,12 @@
 #ifndef LATINIME_PROXIMITY_INFO_UTILS_H
 #define LATINIME_PROXIMITY_INFO_UTILS_H
 
+#include <cmath>
+
 #include "additional_proximity_chars.h"
 #include "char_utils.h"
 #include "defines.h"
+#include "geometry_utils.h"
 #include "hash_map_compat.h"
 
 namespace latinime {
@@ -78,12 +81,69 @@ class ProximityInfoUtils {
         }
     }
 
-    AK_FORCE_INLINE static int getStartIndexFromCoordinates(const int maxProximityCharsSize,
+    static AK_FORCE_INLINE int getStartIndexFromCoordinates(const int maxProximityCharsSize,
             const int x, const int y, const int cellHeight, const int cellWidth,
             const int gridWidth) {
         return ((y / cellHeight) * gridWidth + (x / cellWidth)) * maxProximityCharsSize;
     }
 
+    static inline float getSquaredDistanceFloat(const float x1, const float y1, const float x2,
+            const float y2) {
+        return SQUARE_FLOAT(x1 - x2) + SQUARE_FLOAT(y1 - y2);
+    }
+
+    static AK_FORCE_INLINE int getDistanceInt(const int x1, const int y1, const int x2,
+            const int y2) {
+        return static_cast<int>(hypotf(static_cast<float>(x1 - x2), static_cast<float>(y1 - y2)));
+    }
+
+    static inline float pointToLineSegSquaredDistanceFloat(const float x, const float y,
+        const float x1, const float y1, const float x2, const float y2, const bool extend) {
+        const float ray1x = x - x1;
+        const float ray1y = y - y1;
+        const float ray2x = x2 - x1;
+        const float ray2y = y2 - y1;
+
+        const float dotProduct = ray1x * ray2x + ray1y * ray2y;
+        const float lineLengthSqr = SQUARE_FLOAT(ray2x) + SQUARE_FLOAT(ray2y);
+        const float projectionLengthSqr = dotProduct / lineLengthSqr;
+
+        float projectionX;
+        float projectionY;
+        if (!extend && projectionLengthSqr < 0.0f) {
+            projectionX = x1;
+            projectionY = y1;
+        } else if (!extend && projectionLengthSqr > 1.0f) {
+            projectionX = x2;
+            projectionY = y2;
+        } else {
+            projectionX = x1 + projectionLengthSqr * ray2x;
+            projectionY = y1 + projectionLengthSqr * ray2y;
+        }
+        return getSquaredDistanceFloat(x, y, projectionX, projectionY);
+    }
+
+    // Normal distribution N(u, sigma^2).
+    struct NormalDistribution {
+     public:
+        NormalDistribution(const float u, const float sigma)
+                : mU(u), mSigma(sigma),
+                  mPreComputedNonExpPart(1.0f / sqrtf(2.0f * M_PI_F * SQUARE_FLOAT(sigma))),
+                  mPreComputedExponentPart(-1.0f / (2.0f * SQUARE_FLOAT(sigma))) {}
+
+        float getProbabilityDensity(const float x) const {
+            const float shiftedX = x - mU;
+            return mPreComputedNonExpPart * expf(mPreComputedExponentPart * SQUARE_FLOAT(shiftedX));
+        }
+
+     private:
+        DISALLOW_IMPLICIT_CONSTRUCTORS(NormalDistribution);
+        const float mU; // mean value
+        const float mSigma; // standard deviation
+        const float mPreComputedNonExpPart; // = 1 / sqrt(2 * PI * sigma^2)
+        const float mPreComputedExponentPart; // = -1 / (2 * sigma^2)
+    }; // struct NormalDistribution
+
  private:
     DISALLOW_IMPLICIT_CONSTRUCTORS(ProximityInfoUtils);