Add support for the "repaint" layout tests (LayoutTests/fast/repaint/*), whic...

skia/ext/bitmap_platform_device_win.h

 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef SKIA_BITMAP_PLATFORM_DEVICE_WIN_H_
 #define SKIA_BITMAP_PLATFORM_DEVICE_WIN_H_
 
 #include "skia/ext/platform_device_win.h"
 
 namespace skia {
@@ skipping 49 matching lines @@
   virtual HDC getBitmapDC();
   virtual void setMatrixClip(const SkMatrix& transform, const SkRegion& region);
 
   virtual void drawToHDC(HDC dc, int x, int y, const RECT* src_rect);
   virtual void prepareForGDI(int x, int y, int width, int height);
   virtual void postProcessGDI(int x, int y, int width, int height);
   virtual void makeOpaque(int x, int y, int width, int height);
   virtual void fixupAlphaBeforeCompositing();
   virtual bool IsVectorial() { return false; }
 
+  // Replaces occurrences of kMagicTransparencyColor with black. See
+  // fixupAlphaBeforeCompositing()'s documentation in platform_device_win.h for
+  // an explanation of why this is needed.
+  static void fixupAlpha(SkBitmap& bitmap);
+
   // Returns the color value at the specified location. This does not
   // consider any transforms that may be set on the device.
   SkColor getColorAt(int x, int y);
 
  protected:
   // Flushes the Windows device context so that the pixel data can be accessed
   // directly by Skia. Overridden from SkDevice, this is called when Skia
   // starts accessing pixel data.
   virtual void onAccessBitmap(SkBitmap* bitmap);
 
@@ skipping 22 matching lines @@
 
   // Data associated with this device, guaranteed non-null. We hold a reference
   // to this object.
   BitmapPlatformDeviceWinData* data_;
 };
 
 }  // namespace skia
 
 #endif  // SKIA_BITMAP_PLATFORM_DEVICE_WIN_H_