CL removing inheritance of SkDevice from PlatformDevice. Flavours of PlatformDevice classes now ...

skia/ext/bitmap_platform_device_win.h

 // 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_BITMAP_PLATFORM_DEVICE_WIN_H_
 #define SKIA_EXT_BITMAP_PLATFORM_DEVICE_WIN_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "skia/ext/platform_device_win.h"
 
 namespace skia {
 
 // A device is basically a wrapper around SkBitmap that provides a surface for
 // SkCanvas to draw into. Our device provides a surface Windows can also write
 // to. BitmapPlatformDevice creates a bitmap using CreateDIBSection() in a
 // format that Skia supports and can then use this to draw ClearType into, etc.
 // This pixel data is provided to the bitmap that the device contains so that it
 // can be shared.
 //
 // The device owns the pixel data, when the device goes away, the pixel data
 // also becomes invalid. THIS IS DIFFERENT THAN NORMAL SKIA which uses
 // reference counting for the pixel data. In normal Skia, you could assign
 // another bitmap to this device's bitmap and everything will work properly.
 // For us, that other bitmap will become invalid as soon as the device becomes
 // invalid, which may lead to subtle bugs. Therefore, DO NOT ASSIGN THE
 // DEVICE'S PIXEL DATA TO ANOTHER BITMAP, make sure you copy instead.
-class SK_API BitmapPlatformDevice : public PlatformDevice {
+class SK_API BitmapPlatformDevice : public PlatformDevice,
+    public SkDevice::SkMatrixClipObserver {
  public:
   // Factory function. The screen DC is used to create the bitmap, and will not
   // be stored beyond this function. is_opaque should be set if the caller
   // knows the bitmap will be completely opaque and allows some optimizations.
   //
   // The shared_section parameter is optional (pass NULL for default behavior).
   // If shared_section is non-null, then it must be a handle to a file-mapping
   // object returned by CreateFileMapping.  See CreateDIBSection for details.
-  static BitmapPlatformDevice* create(HDC screen_dc,
-                                      int width,
-                                      int height,
-                                      bool is_opaque,
-                                      HANDLE shared_section);
+  static SkDevice* create(HDC screen_dc,
+                          int width,
+                          int height,
+                          bool is_opaque,
+                          HANDLE shared_section);
 
   // This version is the same as above but will get the screen DC itself.
-  static BitmapPlatformDevice* create(int width,
-                                      int height,
-                                      bool is_opaque,
-                                      HANDLE shared_section);
+  static SkDevice* create(int width,
+                          int height,
+                          bool is_opaque,
+                          HANDLE shared_section);
 
   virtual ~BitmapPlatformDevice();
 
   // PlatformDevice overrides
   // Retrieves the bitmap DC, which is the memory DC for our bitmap data. The
   // bitmap DC is lazy created.
   virtual PlatformSurface BeginPlatformPaint();
   virtual void EndPlatformPaint();
 
   virtual void DrawToNativeContext(HDC dc, int x, int y, const RECT* src_rect);
   virtual void MakeOpaque(int x, int y, int width, int height);
 
+  virtual void matrixClipChanged(const SkMatrix& transform,
+                                 const SkRegion& region, const SkClipStack&);
+#if 0
   // Loads the given transform and clipping region into the HDC. This is
   // overridden from SkDevice.
   virtual void setMatrixClip(const SkMatrix& transform, const SkRegion& region,
                              const SkClipStack&);
+#endif
 
  protected:
+#if 0
   // 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);
+#endif
 
+#if 0
   virtual SkDevice* onCreateCompatibleDevice(SkBitmap::Config, int width,
                                              int height, bool isOpaque,
                                              Usage usage);
+#endif
 
  private:
   // Reference counted data that can be shared between multiple devices. This
   // allows copy constructors and operator= for devices to work properly. The
   // bitmaps used by the base device class are already refcounted and copyable.
   class BitmapPlatformDeviceData;
 
   // Private constructor. The data should already be ref'ed for us.
   BitmapPlatformDevice(BitmapPlatformDeviceData* data,
-                       const SkBitmap& bitmap);
+                       /*const SkBitmap& bitmap*/
+                       SkDevice* device);
 
   // Data associated with this device, guaranteed non-null. We hold a reference
   // to this object.
   BitmapPlatformDeviceData* data_;
 
 #ifdef SK_DEBUG
   int begin_paint_count_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(BitmapPlatformDevice);
 };
 
 }  // namespace skia
 
 #endif  // SKIA_EXT_BITMAP_PLATFORM_DEVICE_WIN_H_