Track the region where text is painted.

Source/WebKit/chromium/tests/PlatformContextSkiaTest.cpp

 /*
  * Copyright (C) 2012 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
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 741 matching lines @@
     EXPECT_EQ_RECT(IntRect(10, 20, 90, 80), platformContext.opaqueRegion().asRect());
     EXPECT_PIXELS_MATCH(bitmap, platformContext.opaqueRegion().asRect());
 
     platformContext.drawIRect(SkIRect::MakeXYWH(50, 0, 50, 100), alphaPaint);
     EXPECT_EQ_RECT(IntRect(10, 20, 40, 80), platformContext.opaqueRegion().asRect());
     EXPECT_PIXELS_MATCH(bitmap, platformContext.opaqueRegion().asRect());
 }
 
 TEST(PlatformContextSkiaTest, trackOpaqueTextTest)
 {
+    int width = 200, height = 200;
     SkBitmap bitmap;
-    bitmap.setConfig(SkBitmap::kARGB_8888_Config, 200, 200);
+    bitmap.setConfig(SkBitmap::kARGB_8888_Config, width, height);
     bitmap.allocPixels();
     bitmap.eraseColor(0);
     SkCanvas canvas(bitmap);
+    SkRect textRect = SkRect::MakeWH(width, height);
 
     PlatformContextSkia platformContext(&canvas);
     platformContext.setTrackOpaqueRegion(true);
     GraphicsContext context(&platformContext);
 
     Color opaque(1.0f, 0.0f, 0.0f, 1.0f);
     Color alpha(0.0f, 0.0f, 0.0f, 0.0f);
 
     SkPaint opaquePaint;
     opaquePaint.setColor(opaque.rgb());
     opaquePaint.setXfermodeMode(SkXfermode::kSrc_Mode);
     SkPaint alphaPaint;
     alphaPaint.setColor(alpha.rgb());
     alphaPaint.setXfermodeMode(SkXfermode::kSrc_Mode);
 
     SkPoint point = SkPoint::Make(0, 0);
     SkScalar pointX = 0;
     SkPath path;
     path.moveTo(SkPoint::Make(0, 0));
     path.lineTo(SkPoint::Make(100, 0));
 
     context.fillRect(FloatRect(50, 50, 50, 50), opaque, ColorSpaceDeviceRGB, CompositeSourceOver);
     EXPECT_EQ_RECT(IntRect(50, 50, 50, 50), platformContext.opaqueRegion().asRect());
     EXPECT_PIXELS_MATCH(bitmap, platformContext.opaqueRegion().asRect());
 
-    platformContext.drawPosText("A", 1, &point, opaquePaint);
+    platformContext.drawPosText("A", 1, &point, textRect, opaquePaint);
     EXPECT_EQ_RECT(IntRect(50, 50, 50, 50), platformContext.opaqueRegion().asRect());
     EXPECT_PIXELS_MATCH(bitmap, platformContext.opaqueRegion().asRect());
 
-    platformContext.drawPosText("A", 1, &point, alphaPaint);
+    platformContext.drawPosText("A", 1, &point, textRect, alphaPaint);
     EXPECT_EQ_RECT(IntRect(0, 0, 0, 0), platformContext.opaqueRegion().asRect());
     EXPECT_PIXELS_MATCH(bitmap, platformContext.opaqueRegion().asRect());
 
     context.fillRect(FloatRect(50, 50, 50, 50), opaque, ColorSpaceDeviceRGB, CompositeSourceOver);
     EXPECT_EQ_RECT(IntRect(50, 50, 50, 50), platformContext.opaqueRegion().asRect());
     EXPECT_PIXELS_MATCH(bitmap, platformContext.opaqueRegion().asRect());
 
-    platformContext.drawPosTextH("A", 1, &pointX, 0, opaquePaint);
+    platformContext.drawPosTextH("A", 1, &pointX, 0, textRect, opaquePaint);
     EXPECT_EQ_RECT(IntRect(50, 50, 50, 50), platformContext.opaqueRegion().asRect());
     EXPECT_PIXELS_MATCH(bitmap, platformContext.opaqueRegion().asRect());
 
-    platformContext.drawPosTextH("A", 1, &pointX, 0, alphaPaint);
+    platformContext.drawPosTextH("A", 1, &pointX, 0, textRect, alphaPaint);
     EXPECT_EQ_RECT(IntRect(0, 0, 0, 0), platformContext.opaqueRegion().asRect());
     EXPECT_PIXELS_MATCH(bitmap, platformContext.opaqueRegion().asRect());
 
     context.fillRect(FloatRect(50, 50, 50, 50), opaque, ColorSpaceDeviceRGB, CompositeSourceOver);
     EXPECT_EQ_RECT(IntRect(50, 50, 50, 50), platformContext.opaqueRegion().asRect());
     EXPECT_PIXELS_MATCH(bitmap, platformContext.opaqueRegion().asRect());
 
-    platformContext.drawTextOnPath("A", 1, path, 0, opaquePaint);
+    platformContext.drawTextOnPath("A", 1, path, textRect, 0, opaquePaint);
     EXPECT_EQ_RECT(IntRect(50, 50, 50, 50), platformContext.opaqueRegion().asRect());
     EXPECT_PIXELS_MATCH(bitmap, platformContext.opaqueRegion().asRect());
 
-    platformContext.drawTextOnPath("A", 1, path, 0, alphaPaint);
+    platformContext.drawTextOnPath("A", 1, path, textRect, 0, alphaPaint);
     EXPECT_EQ_RECT(IntRect(0, 0, 0, 0), platformContext.opaqueRegion().asRect());
     EXPECT_PIXELS_MATCH(bitmap, platformContext.opaqueRegion().asRect());
 }
 
 TEST(PlatformContextSkiaTest, trackOpaqueWritePixelsTest)
 {
     SkBitmap bitmap;
     bitmap.setConfig(SkBitmap::kARGB_8888_Config, 200, 200);
     bitmap.allocPixels();
     bitmap.eraseColor(0);
@@ skipping 321 matching lines @@
     path.moveTo(FloatPoint(10, 10));
     path.addLineTo(FloatPoint(40, 40));
     context.strokePath(path);
 
     context.endTransparencyLayer();
     EXPECT_EQ_RECT(IntRect(), platformContext.opaqueRegion().asRect());
     EXPECT_PIXELS_MATCH_EXACT(bitmap, platformContext.opaqueRegion().asRect());
 }
 
 } // namespace