Merge 106663 - [Chromium] Use the current clip when marking paints as opaque

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 10 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 
 #include "PlatformContextSkia.h"
 
 #include "BitmapImageSingleFrameSkia.h"
 #include "GraphicsContext.h"
+#include "ImageBuffer.h"
 #include "NativeImageSkia.h"
 #include "SkCanvas.h"
 #include <gtest/gtest.h>
 
 using namespace WebCore;
 
 namespace {
 
 #define EXPECT_EQ_RECT(a, b) \
     EXPECT_EQ(a.x(), b.x()); \
@@ skipping 63 matching lines @@
 
     context.fillRect(FloatRect(10, 10, 390, 50), alpha, ColorSpaceDeviceRGB);
     EXPECT_EQ_RECT(IntRect(30, 30, 290, 290), platformContext.opaqueRegion().asRect());
     EXPECT_PIXELS_MATCH(bitmap, platformContext.opaqueRegion().asRect());
 
     context.fillRect(FloatRect(10, 10, 390, 50), opaque, ColorSpaceDeviceRGB, CompositeSourceOver);
     EXPECT_EQ_RECT(IntRect(30, 10, 290, 310), platformContext.opaqueRegion().asRect());
     EXPECT_PIXELS_MATCH(bitmap, platformContext.opaqueRegion().asRect());
 }
 
+TEST(PlatformContextSkiaTest, trackOpaqueClipTest)
+{
+    SkBitmap bitmap;
+    bitmap.setConfig(SkBitmap::kARGB_8888_Config, 400, 400);
+    bitmap.allocPixels();
+    SkCanvas canvas(bitmap);
+
+    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);
+
+    context.fillRect(FloatRect(10, 10, 90, 90), opaque, ColorSpaceDeviceRGB, CompositeSourceOver);
+    EXPECT_EQ_RECT(IntRect(10, 10, 90, 90), platformContext.opaqueRegion().asRect());
+    EXPECT_PIXELS_MATCH(bitmap, platformContext.opaqueRegion().asRect());
+
+    context.clearRect(FloatRect(10, 10, 90, 90));
+    EXPECT_EQ_RECT(IntRect(), platformContext.opaqueRegion().asRect());
+
+    context.save();
+    context.clip(FloatRect(0, 0, 10, 10));
+    context.fillRect(FloatRect(10, 10, 90, 90), opaque, ColorSpaceDeviceRGB, CompositeSourceOver);
+    EXPECT_EQ_RECT(IntRect(), platformContext.opaqueRegion().asRect());
+    EXPECT_PIXELS_MATCH(bitmap, platformContext.opaqueRegion().asRect());
+    context.restore();
+
+    context.clearRect(FloatRect(10, 10, 90, 90));
+    EXPECT_EQ_RECT(IntRect(), platformContext.opaqueRegion().asRect());
+
+    context.save();
+    context.clip(FloatRect(20, 20, 10, 10));
+    context.fillRect(FloatRect(10, 10, 90, 90), opaque, ColorSpaceDeviceRGB, CompositeSourceOver);
+    EXPECT_EQ_RECT(IntRect(20, 20, 10, 10), platformContext.opaqueRegion().asRect());
+    EXPECT_PIXELS_MATCH(bitmap, platformContext.opaqueRegion().asRect());
+
+    context.clearRect(FloatRect(10, 10, 90, 90));
+    EXPECT_EQ_RECT(IntRect(), platformContext.opaqueRegion().asRect());
+
+    // The intersection of the two clips becomes empty.
+    context.clip(FloatRect(30, 20, 10, 10));
+    context.fillRect(FloatRect(10, 10, 90, 90), opaque, ColorSpaceDeviceRGB, CompositeSourceOver);
+    EXPECT_EQ_RECT(IntRect(), platformContext.opaqueRegion().asRect());
+    EXPECT_PIXELS_MATCH(bitmap, platformContext.opaqueRegion().asRect());
+    context.restore();
+
+    context.clearRect(FloatRect(10, 10, 90, 90));
+    EXPECT_EQ_RECT(IntRect(), platformContext.opaqueRegion().asRect());
+
+    Path path;
+    path.moveTo(FloatPoint(0, 0));
+    path.addLineTo(FloatPoint(100, 0));
+
+    // Non-rectangular clips just cause the paint to be considered non-opaque.
+    context.save();
+    context.clipPath(path, RULE_EVENODD);
+    context.fillRect(FloatRect(10, 10, 90, 90), opaque, ColorSpaceDeviceRGB, CompositeSourceOver);
+    EXPECT_EQ_RECT(IntRect(), platformContext.opaqueRegion().asRect());
+    EXPECT_PIXELS_MATCH(bitmap, platformContext.opaqueRegion().asRect());
+    context.restore();
+
+    // Another non-rectangular clip.
+    context.save();
+    context.clip(IntRect(30, 30, 20, 20));
+    context.clipOut(IntRect(30, 30, 10, 10));
+    context.fillRect(FloatRect(10, 10, 90, 90), opaque, ColorSpaceDeviceRGB, CompositeSourceOver);
+    EXPECT_EQ_RECT(IntRect(), platformContext.opaqueRegion().asRect());
+    EXPECT_PIXELS_MATCH(bitmap, platformContext.opaqueRegion().asRect());
+    context.restore();
+
+    OwnPtr<ImageBuffer> alphaImage = ImageBuffer::create(IntSize(100, 100));
+    alphaImage->context()->fillRect(IntRect(0, 0, 100, 100), alpha, ColorSpaceDeviceRGB);
+
+    // Clipping with a non-opaque Image (there is no way to mark an ImageBuffer as opaque today).
+    context.save();
+    context.clipToImageBuffer(alphaImage.get(), FloatRect(30, 30, 10, 10));
+    context.fillRect(FloatRect(10, 10, 90, 90), opaque, ColorSpaceDeviceRGB, CompositeSourceOver);
+    EXPECT_EQ_RECT(IntRect(), platformContext.opaqueRegion().asRect());
+    EXPECT_PIXELS_MATCH(bitmap, platformContext.opaqueRegion().asRect());
+    context.restore();
+}
+
 TEST(PlatformContextSkiaTest, trackOpaqueJoinTest)
 {
     SkBitmap bitmap;
     bitmap.setConfig(SkBitmap::kARGB_8888_Config, 400, 400);
     bitmap.allocPixels();
     SkCanvas canvas(bitmap);
 
     PlatformContextSkia platformContext(&canvas);
     platformContext.setTrackOpaqueRegion(true);
     GraphicsContext context(&platformContext);
@@ skipping 331 matching lines @@
     EXPECT_EQ_RECT(IntRect(40, 41, 60, 59), platformContext.opaqueRegion().asRect());
     EXPECT_PIXELS_MATCH(bitmap, platformContext.opaqueRegion().asRect());
 
     context.setFillColor(alpha, ColorSpaceDeviceRGB);
     context.drawEllipse(IntRect(20, 10, 30, 50));
     EXPECT_EQ_RECT(IntRect(51, 41, 49, 59), platformContext.opaqueRegion().asRect());
     EXPECT_PIXELS_MATCH(bitmap, platformContext.opaqueRegion().asRect());
 }
 
 } // namespace