Refactor the PlatformContext layer to have only one class.

skia/ext/platform_device_mac.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_EXT_PLATFORM_DEVICE_MAC_H_
 #define SKIA_EXT_PLATFORM_DEVICE_MAC_H_
 
 #import <ApplicationServices/ApplicationServices.h>
 #include "third_party/skia/include/core/SkDevice.h"
 
 class SkMatrix;
 class SkPath;
 class SkRegion;
 
 namespace skia {
 
 // A device is basically a wrapper around SkBitmap that provides a surface for
 // SkCanvas to draw into. Our device provides a surface CoreGraphics can also
 // write to. It also provides functionality to play well with CG 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 PlatformDeviceMac : public SkDevice {
+class PlatformDevice : public SkDevice {
  public:
+  typedef CGContextRef PlatformSurface;
+
   // 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;
 
   // Draws to the given graphics context. If the bitmap context doesn't exist,
   // this will temporarily create it. However, if you have created the bitmap
   // context, 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.
@@ skipping 10 matching lines @@
   // clipping or as a stroke.
   static void LoadPathToCGContext(CGContextRef context, const SkPath& path);
 
   // Loads a SkRegion into the CG context.
   static void LoadClippingRegionToCGContext(CGContextRef context,
                                             const SkRegion& region,
                                             const SkMatrix& transformation);
 
  protected:
   // Forwards |bitmap| to SkDevice's constructor.
-  PlatformDeviceMac(const SkBitmap& bitmap);
+  PlatformDevice(const SkBitmap& bitmap);
 
   // Loads the specified Skia transform into the device context
   static void LoadTransformToCGContext(CGContextRef context,
                                        const SkMatrix& matrix);
 
   // Function pointer used by the processPixels method for setting the alpha
   // value of a particular pixel.
   typedef void (*adjustAlpha)(uint32_t* pixel);
 
   // Loops through each of the pixels in the specified range, invoking
   // adjustor for the alpha value of each pixel.
   virtual void processPixels(int x,
                              int y,
                              int width,
                              int height,
                              adjustAlpha adjustor) = 0;
 };
 
 }  // namespace skia
 
 #endif  // SKIA_EXT_PLATFORM_DEVICE_MAC_H_