Replace setMatrixClip() with BeginPlatformPaint() logic

skia/ext/platform_device.h

 // Copyright (c) 2012 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_EXT_PLATFORM_DEVICE_H_
 #define SKIA_EXT_PLATFORM_DEVICE_H_
 
 #include "build/build_config.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #include <vector>
 #endif
 
 #include "skia/ext/platform_surface.h"
 #include "third_party/skia/include/core/SkBitmapDevice.h"
 #include "third_party/skia/include/core/SkTypes.h"
 
 class SkMatrix;
 class SkPath;
-class SkRegion;
 
 namespace skia {
 
 class PlatformDevice;
 class ScopedPlatformPaint;
 
 // The following routines provide accessor points for the functionality
 // exported by the various PlatformDevice ports.  
 // All calls to PlatformDevice::* should be routed through these 
 // helper functions.
@@ skipping 20 matching lines @@
 // from SkBaseDevice it might make sense for PlatformDevice to be derived
 // from it.
 class SK_API PlatformDevice {
  public:
   virtual ~PlatformDevice() {}
 
 #if defined(OS_MACOSX)
   // The CGContext that corresponds to the bitmap, used for CoreGraphics
   // operations drawing into the bitmap. This is possibly heavyweight, so it
   // should exist only during one pass of rendering.
-  virtual CGContextRef GetBitmapContext() = 0;
+  virtual CGContextRef GetBitmapContext(const SkMatrix& transform,
+                                        const SkIRect& clip_bounds) = 0;
 #endif
 
 #if defined(OS_WIN)
   // Draws to the given screen DC, if the bitmap DC doesn't exist, this will
   // temporarily create it. However, if you have created the bitmap DC, it will
   // be more efficient if you don't free it until after this call so it doesn't
   // have to be created twice.  If src_rect is null, then the entirety of the
   // source device will be copied.
-  virtual void DrawToHDC(HDC, int x, int y, const RECT* src_rect);
+  virtual void DrawToHDC(HDC source_dc, HDC destination_dc, int x, int y,
+                         const RECT* src_rect, const SkMatrix& transform);
 #endif
 
  private:
   // The DC that corresponds to the bitmap, used for GDI operations drawing
   // into the bitmap. This is possibly heavyweight, so it should be existant
   // only during one pass of rendering.
-  virtual PlatformSurface BeginPlatformPaint();
+  virtual PlatformSurface BeginPlatformPaint(const SkMatrix& transform,
+                                             const SkIRect& clip_bounds);
 
   friend class ScopedPlatformPaint;
 };
 
 }  // namespace skia
 
 #endif  // SKIA_EXT_PLATFORM_DEVICE_H_