Decode GIF image frames on demand.

Source/WebKit/chromium/tests/DragImageTest.cpp

 /*
  * Copyright (C) 2010 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 41 matching lines @@
     explicit TestImage(const IntSize& size)
         : Image(0)
         , m_size(size)
     {
         m_nativeImage = NativeImageSkia::create();
         m_nativeImage->bitmap().setConfig(SkBitmap::kARGB_8888_Config,
                                           size.width(), size.height(), 0);
         m_nativeImage->bitmap().allocPixels();
     }
 
-    virtual IntSize size() const
+    virtual IntSize size() const OVERRIDE
     {
         return m_size;
     }
 
-    virtual PassRefPtr<NativeImageSkia> nativeImageForCurrentFrame()
+    virtual PassRefPtr<NativeImageSkia> nativeImageForCurrentFrame() OVERRIDE
     {
         if (m_size.isZero())
             return 0;
 
         return m_nativeImage;
     }
 
     // Stub implementations of pure virtual Image functions.
-    virtual void destroyDecodedData(bool)
+    virtual void destroyDecodedData() OVERRIDE
     {
     }
 
-    virtual unsigned int decodedSize() const
+    virtual unsigned decodedSize() const OVERRIDE
     {
         return 0u;
     }
 
-    virtual bool currentFrameKnownToBeOpaque()
+    virtual bool currentFrameKnownToBeOpaque() OVERRIDE
     {
         return false;
     }
 
-    virtual void draw(WebCore::GraphicsContext*, const WebCore::FloatRect&,
-                      const WebCore::FloatRect&, WebCore::ColorSpace,
-                      WebCore::CompositeOperator, WebCore::BlendMode)
+    virtual void draw(GraphicsContext*, const FloatRect&, const FloatRect&, ColorSpace, CompositeOperator, BlendMode) OVERRIDE
     {
     }
 
 private:
 
     IntSize m_size;
 
     RefPtr<NativeImageSkia> m_nativeImage;
 };
 
@@ skipping 40 matching lines @@
         // Tests that the drag image is a deep copy.
         RefPtr<TestImage> testImage(TestImage::create(IntSize(1, 1)));
         DragImageRef dragImage = createDragImageFromImage(testImage.get());
         ASSERT_TRUE(dragImage);
         SkAutoLockPixels lock1(*dragImage->bitmap), lock2(testImage->nativeImageForCurrentFrame()->bitmap());
         EXPECT_NE(dragImage->bitmap->getPixels(), testImage->nativeImageForCurrentFrame()->bitmap().getPixels());
     }
 }
 
 } // anonymous namespace