rename getBitmapDC to beginPlatformPaint and add calls to endPlatformPaint

skia/ext/platform_device_win.h

-// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// Copyright (c) 2011 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_WIN_H_
 #define SKIA_EXT_PLATFORM_DEVICE_WIN_H_
 #pragma once
 
 #include <windows.h>
 
 #include <vector>
@@ skipping 11 matching lines @@
 // to. It also provides functionality to play well with GDI drawing functions.
 // This class is abstract and must be subclassed. It provides the basic
 // interface to implement it either with or without a bitmap backend.
 class SK_API PlatformDevice : public SkDevice {
  public:
   typedef HDC PlatformSurface;
 
   // 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 HDC getBitmapDC() = 0;
+  virtual HDC beginPlatformPaint() = 0;
+
+  // Finish a previous call to beginPlatformPaint.
+  virtual void endPlatformPaint() { }
 
   // 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 dc, int x, int y, const RECT* src_rect) = 0;
 
   // Sets the opacity of each pixel in the specified region to be opaque.
   virtual void makeOpaque(int x, int y, int width, int height) { }
@@ skipping 31 matching lines @@
   static void LoadTransformToDC(HDC dc, const SkMatrix& matrix);
 
   // Transforms SkPath's paths into a series of cubic path.
   static bool SkPathToCubicPaths(CubicPaths* paths, const SkPath& skpath);
 };
 
 }  // namespace skia
 
 #endif  // SKIA_EXT_PLATFORM_DEVICE_WIN_H_