Treat calls to CanvasRenderingContext2D.clearRect as operations that clear the canvas

Source/platform/graphics/GraphicsContextTest.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 56 matching lines @@
 }
 
 TEST(GraphicsContextTest, trackOpaqueTest)
 {
     SkBitmap bitmap;
     ASSERT_TRUE(bitmap.allocN32Pixels(400, 400));
     bitmap.eraseColor(0);
     SkCanvas canvas(bitmap);
 
     GraphicsContext context(&canvas);
-    context.setTrackOpaqueRegion(true);
+    context.setRegionTrackingMode(GraphicsContext::RegionTrackingOpaque);
 
     Color opaque(1.0f, 0.0f, 0.0f, 1.0f);
     Color alpha(0.0f, 0.0f, 0.0f, 0.0f);
 
     context.fillRect(FloatRect(10, 10, 90, 90), opaque, CompositeSourceOver);
     EXPECT_EQ_RECT(IntRect(10, 10, 90, 90), context.opaqueRegion().asRect());
     EXPECT_PIXELS_MATCH(bitmap, context.opaqueRegion().asRect());
 
     context.fillRect(FloatRect(10, 10, 90, 90), alpha, CompositeSourceOver);
     EXPECT_EQ_RECT(IntRect(10, 10, 90, 90), context.opaqueRegion().asRect());
@@ skipping 36 matching lines @@
     EXPECT_PIXELS_MATCH(bitmap, context.opaqueRegion().asRect());
 }
 
 TEST(GraphicsContextTest, trackOpaqueClipTest)
 {
     SkBitmap bitmap;
     ASSERT_TRUE(bitmap.allocN32Pixels(400, 400));
     SkCanvas canvas(bitmap);
 
     GraphicsContext context(&canvas);
-    context.setTrackOpaqueRegion(true);
+    context.setRegionTrackingMode(GraphicsContext::RegionTrackingOpaque);
 
     Color opaque(1.0f, 0.0f, 0.0f, 1.0f);
     Color alpha(0.0f, 0.0f, 0.0f, 0.0f);
 
     context.fillRect(FloatRect(10, 10, 90, 90), opaque, CompositeSourceOver);
     EXPECT_EQ_RECT(IntRect(10, 10, 90, 90), context.opaqueRegion().asRect());
     EXPECT_PIXELS_MATCH(bitmap, context.opaqueRegion().asRect());
 
     context.clearRect(FloatRect(10, 10, 90, 90));
     EXPECT_EQ_RECT(IntRect(), context.opaqueRegion().asRect());
@@ skipping 74 matching lines @@
 }
 
 TEST(GraphicsContextTest, trackImageMask)
 {
     SkBitmap bitmap;
     ASSERT_TRUE(bitmap.allocN32Pixels(400, 400));
     bitmap.eraseColor(0);
     SkCanvas canvas(bitmap);
 
     GraphicsContext context(&canvas);
-    context.setTrackOpaqueRegion(true);
+    context.setRegionTrackingMode(GraphicsContext::RegionTrackingOpaque);
 
     Color opaque(1.0f, 0.0f, 0.0f, 1.0f);
     Color alpha(0.0f, 0.0f, 0.0f, 0.0f);
 
     // Image masks are done by drawing a bitmap into a transparency layer that uses DstIn to mask
     // out a transparency layer below that is filled with the mask color. In the end this should
     // not be marked opaque.
 
     context.setCompositeOperation(CompositeSourceOver);
     context.beginTransparencyLayer(1);
@@ skipping 16 matching lines @@
 }
 
 TEST(GraphicsContextTest, trackImageMaskWithOpaqueRect)
 {
     SkBitmap bitmap;
     ASSERT_TRUE(bitmap.allocN32Pixels(400, 400));
     bitmap.eraseColor(0);
     SkCanvas canvas(bitmap);
 
     GraphicsContext context(&canvas);
-    context.setTrackOpaqueRegion(true);
+    context.setRegionTrackingMode(GraphicsContext::RegionTrackingOpaque);
 
     Color opaque(1.0f, 0.0f, 0.0f, 1.0f);
     Color alpha(0.0f, 0.0f, 0.0f, 0.0f);
 
     // Image masks are done by drawing a bitmap into a transparency layer that uses DstIn to mask
     // out a transparency layer below that is filled with the mask color. In the end this should
     // not be marked opaque.
 
     context.setCompositeOperation(CompositeSourceOver);
     context.beginTransparencyLayer(1);
@@ skipping 18 matching lines @@
     EXPECT_PIXELS_MATCH_EXACT(bitmap, context.opaqueRegion().asRect());
 }
 
 TEST(GraphicsContextTest, trackOpaqueJoinTest)
 {
     SkBitmap bitmap;
     ASSERT_TRUE(bitmap.allocN32Pixels(400, 400));
     SkCanvas canvas(bitmap);
 
     GraphicsContext context(&canvas);
-    context.setTrackOpaqueRegion(true);
+    context.setRegionTrackingMode(GraphicsContext::RegionTrackingOpaque);
 
     Color opaque(1.0f, 0.0f, 0.0f, 1.0f);
     Color alpha(0.0f, 0.0f, 0.0f, 0.0f);
 
     context.fillRect(FloatRect(20, 20, 10, 10), opaque, CompositeSourceOver);
     EXPECT_EQ_RECT(IntRect(20, 20, 10, 10), context.opaqueRegion().asRect());
     EXPECT_PIXELS_MATCH(bitmap, context.opaqueRegion().asRect());
 
     // Doesn't join
     context.fillRect(FloatRect(31, 20, 10, 10), opaque, CompositeSourceOver);
@@ skipping 37 matching lines @@
 }
 
 TEST(GraphicsContextTest, trackOpaqueLineTest)
 {
     SkBitmap bitmap;
     ASSERT_TRUE(bitmap.allocN32Pixels(200, 200));
     bitmap.eraseColor(0);
     SkCanvas canvas(bitmap);
 
     GraphicsContext context(&canvas);
-    context.setTrackOpaqueRegion(true);
+    context.setRegionTrackingMode(GraphicsContext::RegionTrackingOpaque);
 
     Color opaque(1.0f, 0.0f, 0.0f, 1.0f);
     Color alpha(0.0f, 0.0f, 0.0f, 0.0f);
 
     context.setShouldAntialias(false);
     context.setMiterLimit(0);
     context.setStrokeThickness(4);
     context.setLineCap(SquareCap);
     context.setStrokeStyle(SolidStroke);
     context.setCompositeOperation(CompositeSourceOver);
@@ skipping 72 matching lines @@
     EXPECT_PIXELS_MATCH(bitmap, context.opaqueRegion().asRect());
 }
 
 TEST(GraphicsContextTest, trackOpaquePathTest)
 {
     SkBitmap bitmap;
     ASSERT_TRUE(bitmap.allocN32Pixels(200, 200));
     SkCanvas canvas(bitmap);
 
     GraphicsContext context(&canvas);
-    context.setTrackOpaqueRegion(true);
+    context.setRegionTrackingMode(GraphicsContext::RegionTrackingOpaque);
 
     Color opaque(1.0f, 0.0f, 0.0f, 1.0f);
     Color alpha(0.0f, 0.0f, 0.0f, 0.0f);
 
     context.fillRect(FloatRect(10, 10, 90, 90), opaque, CompositeSourceOver);
     EXPECT_EQ_RECT(IntRect(10, 10, 90, 90), context.opaqueRegion().asRect());
     EXPECT_PIXELS_MATCH(bitmap, context.opaqueRegion().asRect());
 
     context.setShouldAntialias(false);
     context.setMiterLimit(1);
@@ skipping 37 matching lines @@
     path.clear();
 }
 
 TEST(GraphicsContextTest, trackOpaqueImageTest)
 {
     SkBitmap bitmap;
     ASSERT_TRUE(bitmap.allocN32Pixels(200, 200));
     SkCanvas canvas(bitmap);
 
     GraphicsContext context(&canvas);
-    context.setTrackOpaqueRegion(true);
+    context.setRegionTrackingMode(GraphicsContext::RegionTrackingOpaque);
 
     Color opaque(1.0f, 0.0f, 0.0f, 1.0f);
     Color alpha(0.0f, 0.0f, 0.0f, 0.0f);
 
     SkBitmap opaqueBitmap;
     ASSERT_TRUE(opaqueBitmap.allocN32Pixels(10, 10, true /* opaque */));
 
     for (int y = 0; y < opaqueBitmap.height(); ++y)
         for (int x = 0; x < opaqueBitmap.width(); ++x)
             *opaqueBitmap.getAddr32(x, y) = 0xFFFFFFFF;
@@ skipping 62 matching lines @@
 }
 
 TEST(GraphicsContextTest, trackOpaqueOvalTest)
 {
     SkBitmap bitmap;
     ASSERT_TRUE(bitmap.allocN32Pixels(200, 200));
     bitmap.eraseColor(0);
     SkCanvas canvas(bitmap);
 
     GraphicsContext context(&canvas);
-    context.setTrackOpaqueRegion(true);
+    context.setRegionTrackingMode(GraphicsContext::RegionTrackingOpaque);
 
     Color opaque(1.0f, 0.0f, 0.0f, 1.0f);
     Color alpha(0.0f, 0.0f, 0.0f, 0.0f);
 
     EXPECT_EQ_RECT(IntRect(0, 0, 0, 0), context.opaqueRegion().asRect());
     EXPECT_PIXELS_MATCH(bitmap, context.opaqueRegion().asRect());
 
     context.fillEllipse(FloatRect(10, 10, 90, 90));
     context.strokeEllipse(FloatRect(10, 10, 90, 90));
     EXPECT_EQ_RECT(IntRect(0, 0, 0, 0), context.opaqueRegion().asRect());
@@ skipping 34 matching lines @@
     EXPECT_PIXELS_MATCH(bitmap, context.opaqueRegion().asRect());
 }
 
 TEST(GraphicsContextTest, trackOpaqueRoundedRectTest)
 {
     SkBitmap bitmap;
     ASSERT_TRUE(bitmap.allocN32Pixels(200, 200));
     SkCanvas canvas(bitmap);
 
     GraphicsContext context(&canvas);
-    context.setTrackOpaqueRegion(true);
+    context.setRegionTrackingMode(GraphicsContext::RegionTrackingOpaque);
 
     Color opaque(1.0f, 0.0f, 0.0f, 1.0f);
     Color alpha(0.0f, 0.0f, 0.0f, 0.0f);
     IntSize radii(10, 10);
 
     EXPECT_EQ_RECT(IntRect(0, 0, 0, 0), context.opaqueRegion().asRect());
     EXPECT_PIXELS_MATCH(bitmap, context.opaqueRegion().asRect());
 
     context.fillRoundedRect(IntRect(10, 10, 90, 90), radii, radii, radii, radii, opaque);
     EXPECT_EQ_RECT(IntRect(0, 0, 0, 0), context.opaqueRegion().asRect());
@@ skipping 26 matching lines @@
 TEST(GraphicsContextTest, trackOpaqueTextTest)
 {
     int width = 200, height = 200;
     SkBitmap bitmap;
     ASSERT_TRUE(bitmap.allocN32Pixels(width, height));
     bitmap.eraseColor(0);
     SkCanvas canvas(bitmap);
     SkRect textRect = SkRect::MakeWH(width, height);
 
     GraphicsContext context(&canvas);
-    context.setTrackOpaqueRegion(true);
+    context.setRegionTrackingMode(GraphicsContext::RegionTrackingOpaque);
 
     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);
@@ skipping 22 matching lines @@
 }
 
 TEST(GraphicsContextTest, trackOpaqueWritePixelsTest)
 {
     SkBitmap bitmap;
     ASSERT_TRUE(bitmap.allocN32Pixels(200, 200));
     bitmap.eraseColor(0);
     SkCanvas canvas(bitmap);
 
     GraphicsContext context(&canvas);
-    context.setTrackOpaqueRegion(true);
+    context.setRegionTrackingMode(GraphicsContext::RegionTrackingOpaque);
 
     Color opaque(1.0f, 0.0f, 0.0f, 1.0f);
 
     SkBitmap opaqueBitmap;
     ASSERT_TRUE(opaqueBitmap.allocN32Pixels(10, 10, true /* opaque */));
     for (int y = 0; y < opaqueBitmap.height(); ++y)
         for (int x = 0; x < opaqueBitmap.width(); ++x)
             *opaqueBitmap.getAddr32(x, y) = 0xFFFFFFFF;
 
     SkBitmap alphaBitmap;
@@ skipping 31 matching lines @@
 }
 
 TEST(GraphicsContextTest, trackOpaqueDrawBitmapTest)
 {
     SkBitmap bitmap;
     ASSERT_TRUE(bitmap.allocN32Pixels(200, 200));
     bitmap.eraseColor(0);
     SkCanvas canvas(bitmap);
 
     GraphicsContext context(&canvas);
-    context.setTrackOpaqueRegion(true);
+    context.setRegionTrackingMode(GraphicsContext::RegionTrackingOpaque);
 
     Color opaque(1.0f, 0.0f, 0.0f, 1.0f);
 
     SkBitmap opaqueBitmap;
     ASSERT_TRUE(opaqueBitmap.allocN32Pixels(10, 10, true /* opaque */));
     for (int y = 0; y < opaqueBitmap.height(); ++y)
         for (int x = 0; x < opaqueBitmap.width(); ++x)
             *opaqueBitmap.getAddr32(x, y) = 0xFFFFFFFF;
 
     SkBitmap alphaBitmap;
@@ skipping 31 matching lines @@
 }
 
 TEST(GraphicsContextTest, trackOpaqueDrawBitmapRectTest)
 {
     SkBitmap bitmap;
     ASSERT_TRUE(bitmap.allocN32Pixels(200, 200));
     bitmap.eraseColor(0);
     SkCanvas canvas(bitmap);
 
     GraphicsContext context(&canvas);
-    context.setTrackOpaqueRegion(true);
+    context.setRegionTrackingMode(GraphicsContext::RegionTrackingOpaque);
 
     Color opaque(1.0f, 0.0f, 0.0f, 1.0f);
 
     SkBitmap opaqueBitmap;
     ASSERT_TRUE(opaqueBitmap.allocN32Pixels(10, 10, true /* opaque */));
     for (int y = 0; y < opaqueBitmap.height(); ++y)
         for (int x = 0; x < opaqueBitmap.width(); ++x)
             *opaqueBitmap.getAddr32(x, y) = 0xFFFFFFFF;
 
     SkBitmap alphaBitmap;
@@ skipping 27 matching lines @@
 }
 
 TEST(GraphicsContextTest, contextTransparencyLayerTest)
 {
     SkBitmap bitmap;
     ASSERT_TRUE(bitmap.allocN32Pixels(400, 400));
     bitmap.eraseColor(0);
     SkCanvas canvas(bitmap);
 
     GraphicsContext context(&canvas);
-    context.setTrackOpaqueRegion(true);
+    context.setRegionTrackingMode(GraphicsContext::RegionTrackingOpaque);
 
     Color opaque(1.0f, 0.0f, 0.0f, 1.0f);
     context.fillRect(FloatRect(20, 20, 10, 10), opaque, CompositeSourceOver);
     EXPECT_EQ_RECT(IntRect(20, 20, 10, 10), context.opaqueRegion().asRect());
     EXPECT_PIXELS_MATCH(bitmap, context.opaqueRegion().asRect());
 
     context.clearRect(FloatRect(20, 20, 10, 10));
     EXPECT_EQ_RECT(IntRect(), context.opaqueRegion().asRect());
 
     context.beginTransparencyLayer(0.5);
@@ skipping 13 matching lines @@
 }
 
 TEST(GraphicsContextTest, UnboundedDrawsAreClipped)
 {
     SkBitmap bitmap;
     ASSERT_TRUE(bitmap.allocN32Pixels(400, 400));
     bitmap.eraseColor(0);
     SkCanvas canvas(bitmap);
 
     GraphicsContext context(&canvas);
-    context.setTrackOpaqueRegion(true);
+    context.setRegionTrackingMode(GraphicsContext::RegionTrackingOpaque);
 
     Color opaque(1.0f, 0.0f, 0.0f, 1.0f);
     Color alpha(0.0f, 0.0f, 0.0f, 0.0f);
 
     Path path;
     context.setShouldAntialias(false);
     context.setMiterLimit(1);
     context.setStrokeThickness(5);
     context.setLineCap(SquareCap);
     context.setStrokeStyle(SolidStroke);
@@ skipping 24 matching lines @@
 }
 
 TEST(GraphicsContextTest, PreserveOpaqueOnlyMattersForFirstLayer)
 {
     SkBitmap bitmap;
     ASSERT_TRUE(bitmap.allocN32Pixels(400, 400));
     bitmap.eraseColor(0);
     SkCanvas canvas(bitmap);
 
     GraphicsContext context(&canvas);
-    context.setTrackOpaqueRegion(true);
+    context.setRegionTrackingMode(GraphicsContext::RegionTrackingOpaque);
 
     Color opaque(1.0f, 0.0f, 0.0f, 1.0f);
     Color alpha(0.0f, 0.0f, 0.0f, 0.0f);
 
     Path path;
     context.setShouldAntialias(false);
     context.setMiterLimit(1);
     context.setStrokeThickness(5);
     context.setLineCap(SquareCap);
     context.setStrokeStyle(SolidStroke);
@@ skipping 130 matching lines @@
     EXPECT_FALSE(pic);
 
     // endRecording finally makes the picture accessible
     dl->endRecording();
     pic = dl->picture();
     EXPECT_TRUE(pic);
     EXPECT_EQ(1, pic->getRefCnt());
 }
 
 } // namespace