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

skia/ext/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_PLATFORM_DEVICE_WIN_H_
-#define SKIA_EXT_PLATFORM_DEVICE_WIN_H_
-#pragma once
-
-#include <windows.h>
-
-#include <vector>
-
-#include "third_party/skia/include/core/SkDevice.h"
-
-class SkMatrix;
-class SkPath;
-class SkRegion;
-
-namespace skia {
-
-// Initializes the default settings and colors in a device context.
-SK_API void InitializeDC(HDC context);
-
-// 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 SK_API PlatformDevice : public SkDevice {
- public:
-  typedef HDC PlatformSurface;
-
-  // 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 PlatformSurface BeginPlatformPaint() = 0;
-
-  // Finish a previous call to beginPlatformPaint.
-  virtual void EndPlatformPaint();
-
-  // 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 DrawToNativeContext(HDC dc, int x, int y,
-                                   const RECT* 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 GDI is allowed to render text to this device.
-  virtual bool IsNativeFontRenderingAllowed() { return true; }
-
-  // True if AlphaBlend() was called during a
-  // BeginPlatformPaint()/EndPlatformPaint() pair.
-  // Used by the printing subclasses.  See |VectorPlatformDeviceEmf|.
-  virtual bool AlphaBlendUsed() const { return false; }
-
-  // Loads a SkPath into the GDI context. The path can there after be used for
-  // clipping or as a stroke. Returns false if the path failed to be loaded.
-  static bool 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.
-  PlatformDevice(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 skia
-
-#endif  // SKIA_EXT_PLATFORM_DEVICE_WIN_H_
-