am b9c4cccf: Merge "Reduce the amount of allocations on Paint_Delegate" into mnc-ub-dev

* commit 'b9c4cccf672d725e75d393c492c917ba726c365c':
  Reduce the amount of allocations on Paint_Delegate

tools/layoutlib/bridge/src/android/graphics/FontFamily_Delegate.java

@@ -178,7 +178,9 @@ public class FontFamily_Delegate {
         desiredStyle.mIsItalic = isItalic;
         FontInfo bestFont = null;
         int bestMatch = Integer.MAX_VALUE;
-        for (FontInfo font : mFonts) {
+        //noinspection ForLoopReplaceableByForEach (avoid iterator instantiation)
+        for (int i = 0, n = mFonts.size(); i < n; i++) {
+            FontInfo font = mFonts.get(i);
             int match = computeMatch(font, desiredStyle);
             if (match < bestMatch) {
                 bestMatch = match;
@@ -415,7 +417,9 @@ public class FontFamily_Delegate {
         boolean isItalic = fontInfo.mIsItalic;
         // The list is usually just two fonts big. So iterating over all isn't as bad as it looks.
         // It's biggest for roboto where the size is 12.
-        for (FontInfo font : mFonts) {
+        //noinspection ForLoopReplaceableByForEach (avoid iterator instantiation)
+        for (int i = 0, n = mFonts.size(); i < n; i++) {
+            FontInfo font = mFonts.get(i);
             if (font.mWeight == weight && font.mIsItalic == isItalic) {
                 return false;
             }

tools/layoutlib/bridge/src/android/graphics/Paint_Delegate.java

@@ -480,8 +480,10 @@ public class Paint_Delegate {
             return;
         }
 
-        delegate.mTextSize = textSize;
-        delegate.updateFontObject();
+        if (delegate.mTextSize != textSize) {
+            delegate.mTextSize = textSize;
+            delegate.updateFontObject();
+        }
     }
 
     @LayoutlibDelegate
@@ -503,8 +505,10 @@ public class Paint_Delegate {
             return;
         }
 
-        delegate.mTextScaleX = scaleX;
-        delegate.updateFontObject();
+        if (delegate.mTextScaleX != scaleX) {
+            delegate.mTextScaleX = scaleX;
+            delegate.updateFontObject();
+        }
     }
 
     @LayoutlibDelegate
@@ -526,8 +530,10 @@ public class Paint_Delegate {
             return;
         }
 
-        delegate.mTextSkewX = skewX;
-        delegate.updateFontObject();
+        if (delegate.mTextSkewX != skewX) {
+            delegate.mTextSkewX = skewX;
+            delegate.updateFontObject();
+        }
     }
 
     @LayoutlibDelegate
@@ -897,9 +903,12 @@ public class Paint_Delegate {
             return 0;
         }
 
-        delegate.mTypeface = Typeface_Delegate.getDelegate(typeface);
-        delegate.mNativeTypeface = typeface;
-        delegate.updateFontObject();
+        Typeface_Delegate typefaceDelegate = Typeface_Delegate.getDelegate(typeface);
+        if (delegate.mTypeface != typefaceDelegate || delegate.mNativeTypeface != typeface) {
+            delegate.mTypeface = Typeface_Delegate.getDelegate(typeface);
+            delegate.mNativeTypeface = typeface;
+            delegate.updateFontObject();
+        }
         return typeface;
     }
 
@@ -1214,13 +1223,31 @@ public class Paint_Delegate {
         mCap = paint.mCap;
         mJoin = paint.mJoin;
         mTextAlign = paint.mTextAlign;
-        mTypeface = paint.mTypeface;
-        mNativeTypeface = paint.mNativeTypeface;
+
+        boolean needsFontUpdate = false;
+        if (mTypeface != paint.mTypeface || mNativeTypeface != paint.mNativeTypeface) {
+            mTypeface = paint.mTypeface;
+            mNativeTypeface = paint.mNativeTypeface;
+            needsFontUpdate = true;
+        }
+
+        if (mTextSize != paint.mTextSize) {
+            mTextSize = paint.mTextSize;
+            needsFontUpdate = true;
+        }
+
+        if (mTextScaleX != paint.mTextScaleX) {
+            mTextScaleX = paint.mTextScaleX;
+            needsFontUpdate = true;
+        }
+
+        if (mTextSkewX != paint.mTextSkewX) {
+            mTextSkewX = paint.mTextSkewX;
+            needsFontUpdate = true;
+        }
+
         mStrokeWidth = paint.mStrokeWidth;
         mStrokeMiter = paint.mStrokeMiter;
-        mTextSize = paint.mTextSize;
-        mTextScaleX = paint.mTextScaleX;
-        mTextSkewX = paint.mTextSkewX;
         mXfermode = paint.mXfermode;
         mColorFilter = paint.mColorFilter;
         mShader = paint.mShader;
@@ -1228,7 +1255,10 @@ public class Paint_Delegate {
         mMaskFilter = paint.mMaskFilter;
         mRasterizer = paint.mRasterizer;
         mHintingMode = paint.mHintingMode;
-        updateFontObject();
+
+        if (needsFontUpdate) {
+            updateFontObject();
+        }
     }
 
     private void reset() {
@@ -1264,10 +1294,18 @@ public class Paint_Delegate {
             // Get the fonts from the TypeFace object.
             List<Font> fonts = mTypeface.getFonts(mFontVariant);
 
+            if (fonts.isEmpty()) {
+                mFonts = Collections.emptyList();
+                return;
+            }
+
             // create new font objects as well as FontMetrics, based on the current text size
             // and skew info.
-            ArrayList<FontInfo> infoList = new ArrayList<FontInfo>(fonts.size());
-            for (Font font : fonts) {
+            int nFonts = fonts.size();
+            ArrayList<FontInfo> infoList = new ArrayList<FontInfo>(nFonts);
+            //noinspection ForLoopReplaceableByForEach (avoid iterator instantiation)
+            for (int i = 0; i < nFonts; i++) {
+                Font font = fonts.get(i);
                 if (font == null) {
                     // If the font is null, add null to infoList. When rendering the text, if this
                     // null is reached, a warning will be logged.