Merge Blink code to cache SkTextBlob

sky/engine/platform/graphics/GraphicsContext.cpp

 /*
  * Copyright (C) 2003, 2004, 2005, 2006, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 900 matching lines @@
     FloatPoint currPoint = point;
     BidiCharacterRun* bidiRun = bidiRuns.firstRun();
     while (bidiRun) {
         TextRun subrun = run.subRun(bidiRun->start(), bidiRun->stop() - bidiRun->start());
         bool isRTL = bidiRun->level() % 2;
         subrun.setDirection(isRTL ? RTL : LTR);
         subrun.setDirectionalOverride(bidiRun->dirOverride());
 
         TextRunPaintInfo subrunInfo(subrun);
         subrunInfo.bounds = runInfo.bounds;
-        font.drawText(this, subrunInfo, currPoint, customFontNotReadyAction);
+        float runWidth = font.drawUncachedText(this, subrunInfo, currPoint, customFontNotReadyAction);
 
         bidiRun = bidiRun->next();
-        // FIXME: Have Font::drawText return the width of what it drew so that we don't have to re-measure here.
-        if (bidiRun)
-            currPoint.move(font.width(subrun), 0);
+        currPoint.move(runWidth, 0);
     }
 
     bidiRuns.deleteRuns();
 }
 
 void GraphicsContext::drawHighlightForText(const Font& font, const TextRun& run, const FloatPoint& point, int h, const Color& backgroundColor, int from, int to)
 {
     if (contextDisabled())
         return;
 
@@ skipping 898 matching lines @@
         // FIXME: This is to not break tests (it results in the filter bitmap flag
         // being set to true). We need to decide if we respect InterpolationNone
         // being returned from computeInterpolationQuality.
         resampling = InterpolationLow;
     }
     resampling = limitInterpolationQuality(this, resampling);
     paint->setFilterLevel(static_cast<SkPaint::FilterLevel>(resampling));
 }
 
 } // namespace blink