Removal of dependencies on PlatformDevice classes.

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_
 #pragma once
 
 #include "third_party/skia/include/core/SkDevice.h"
 
 typedef struct CGContext* CGContextRef;
 typedef struct CGRect CGRect;
 
 class SkMatrix;
 class SkPath;
 class SkRegion;
 
 namespace skia {
 
+// Returns the CGContext that backing the SkDevice.  Forwards to the bound
+// PlatformDevice.  Returns NULL if no PlatformDevice is bound.
+CGContextRef GetBitmapContext(SkDevice* device);
+
 // 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 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.
-  virtual void DrawToContext(CGContextRef context, int x, int y,
-                             const CGRect* src_rect) = 0;
+  virtual void DrawToNativeContext(CGContextRef context, int x, int y,
+                                   const CGRect* 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) { }
 
   // Returns if the preferred rendering engine is vectorial or bitmap based.
   virtual bool IsVectorial() = 0;
 
   // Returns if native platform APIs are allowed to render text to this device.
   virtual bool IsNativeFontRenderingAllowed();
 
   virtual PlatformSurface BeginPlatformPaint();
   virtual void EndPlatformPaint();
 
@@ skipping 15 matching lines @@
 
   // Loads the specified Skia transform into the device context
   static void LoadTransformToCGContext(CGContextRef context,
                                        const SkMatrix& matrix);
 };
 
 }  // namespace skia
 
 #endif  // SKIA_EXT_PLATFORM_DEVICE_MAC_H_