Move skia extensions from the port to skia/ext.

webkit/port/platform/graphics/skia/public/BitmapPlatformDeviceWin.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 BitmapPlatformDeviceWin_h
-#define BitmapPlatformDeviceWin_h
-
-#include "base/gfx/platform_device_win.h"
-#include "base/ref_counted.h"
-
-namespace gfx {
-
-// 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. BitmapPlatformDeviceWin 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 BitmapPlatformDeviceWin : public PlatformDeviceWin {
- 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 BitmapPlatformDeviceWin* create(HDC screen_dc,
-                                int width,
-                                int height,
-                                bool is_opaque,
-                                HANDLE shared_section);
-
-  // Copy constructor. When copied, devices duplicate their internal data, so
-  // stay linked. This is because their implementation is very heavyweight
-  // (lots of memory and some GDI objects). If a device has been copied, both
-  // clip rects and other state will stay in sync.
-  //
-  // This means it will NOT work to duplicate a device and assign it to a
-  // canvas, because the two canvases will each set their own clip rects, and
-  // the resulting GDI clip rect will be random.
-  //
-  // Copy constucting and "=" is designed for saving the device or passing it
-  // around to another routine willing to deal with the bitmap data directly.
-  BitmapPlatformDeviceWin(const BitmapPlatformDeviceWin& other);
-  virtual ~BitmapPlatformDeviceWin();
-
-  // See warning for copy constructor above.
-  BitmapPlatformDeviceWin& operator=(const BitmapPlatformDeviceWin& other);
-
-  // Retrieves the bitmap DC, which is the memory DC for our bitmap data. The
-  // bitmap DC is lazy created.
-  virtual HDC getBitmapDC();
-  virtual void setMatrixClip(const SkMatrix& transform, const SkRegion& region);
-
-  virtual void drawToHDC(HDC dc, int x, int y, const RECT* src_rect);
-  virtual void prepareForGDI(int x, int y, int width, int height);
-  virtual void postProcessGDI(int x, int y, int width, int height);
-  virtual void makeOpaque(int x, int y, int width, int height);
-  virtual void fixupAlphaBeforeCompositing();
-  virtual bool IsVectorial() { return false; }
-
-  // Returns the color value at the specified location. This does not
-  // consider any transforms that may be set on the device.
-  SkColor getColorAt(int x, int y);
-
- protected:
-  // 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);
-
- private:
-  // Function pointer used by the processPixels method for setting the alpha
-  // value of a particular pixel.
-  typedef void (*adjustAlpha)(uint32_t* pixel);
-
-  // 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 BitmapPlatformDeviceWinData;
-
-  // Private constructor.
-  BitmapPlatformDeviceWin(BitmapPlatformDeviceWinData* data,
-                          const SkBitmap& bitmap);
-
-  // Loops through each of the pixels in the specified range, invoking
-  // adjustor for the alpha value of each pixel. If |width| or |height| are -1,
-  // the available width/height is used.
-  template<adjustAlpha adjustor>
-  void processPixels(int x,
-                     int y,
-                     int width,
-                     int height);
-
-  // Data associated with this device, guaranteed non-null.
-  scoped_refptr<BitmapPlatformDeviceWinData> data_;
-};
-
-}  // namespace gfx
-
-#endif  // BASE_GFX_BITMAP_PLATFORM_DEVICE_WIN_H_
-