Move skia extensions from the port to skia/ext.

webkit/port/platform/graphics/skia/public/PlatformDeviceWin.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 PlatformDeviceWin_h
-#define PlatformDeviceWin_h
-
-#include <windows.h>
-
-#include <vector>
-
-#include "SkDevice.h"
-
-class SkMatrix;
-class SkPath;
-class SkRegion;
-
-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. 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 PlatformDeviceWin : public SkDevice {
- public:
-  // 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;
-
-  // 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;
-
-  // Invoke before using GDI functions. See description in platform_device.cc
-  // for specifics.
-  // NOTE: x,y,width and height are relative to the current transform.
-  virtual void prepareForGDI(int x, int y, int width, int height) { }
-
-  // Invoke after using GDI functions. See description in platform_device.cc
-  // for specifics.
-  // NOTE: x,y,width and height are relative to the current transform.
-  virtual void postProcessGDI(int x, int y, int width, int height) { }
-
-  // Sets the opacity of each pixel in the specified region to be opaque.
-  virtual void makeOpaque(int x, int y, int width, int height) { }
-
-  // Call this function to fix the alpha channels before compositing this layer
-  // onto another. Internally, the device uses a special alpha method to work
-  // around problems with Windows. This call will put the values into what
-  // Skia expects, so it can be composited onto other layers.
-  //
-  // After this call, no more drawing can be done because the
-  // alpha channels will be "correct", which, if this function is called again
-  // will make them wrong. See the implementation for more discussion.
-  virtual void fixupAlphaBeforeCompositing() { }
-
-  // Returns if the preferred rendering engine is vectorial or bitmap based.
-  virtual bool IsVectorial() = 0;
-
-  // Initializes the default settings and colors in a device context.
-  static void InitializeDC(HDC context);
-
-  // Loads a SkPath into the GDI context. The path can there after be used for
-  // clipping or as a stroke.
-  static void LoadPathToDC(HDC context, const SkPath& path);
-
-  // Loads a SkRegion into the GDI context.
-  static void LoadClippingRegionToDC(HDC context, const SkRegion& region,
-                                     const SkMatrix& transformation);
-
- protected:
-  // Arrays must be inside structures.
-  struct CubicPoints {
-    SkPoint p[4];
-  };
-  typedef std::vector<CubicPoints> CubicPath;
-  typedef std::vector<CubicPath> CubicPaths;
-
-  // Forwards |bitmap| to SkDevice's constructor.
-  PlatformDeviceWin(const SkBitmap& bitmap);
-
-  // Loads the specified Skia transform into the device context, excluding
-  // perspective (which GDI doesn't support).
-  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 gfx
-
-#endif  // PlatformDeviceWin_h
-