skia/ext/bitmap_platform_device_skia.h

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef SKIA_EXT_BITMAP_PLATFORM_DEVICE_SKIA_H_
   6 #define SKIA_EXT_BITMAP_PLATFORM_DEVICE_SKIA_H_
   7
   8 #include "base/compiler_specific.h"
   9 #include "base/memory/ref_counted.h"
  10 #include "skia/ext/platform_device.h"
  11
  12 namespace skia {
  13
  14 // -----------------------------------------------------------------------------
  15 // For now we just use SkBitmap for SkBitmapDevice
  16 //
  17 // This is all quite ok for test_shell. In the future we will want to use
  18 // shared memory between the renderer and the main process at least. In this
  19 // case we'll probably create the buffer from a precreated region of memory.
  20 // -----------------------------------------------------------------------------
  21 class BitmapPlatformDevice : public SkBitmapDevice, public PlatformDevice {
  22  public:
  23   // Construct a BitmapPlatformDevice. |is_opaque| should be set if the caller
  24   // knows the bitmap will be completely opaque and allows some optimizations.
  25   // The bitmap is not initialized.
  26   static BitmapPlatformDevice* Create(int width, int height, bool is_opaque);
  27
  28   // Construct a BitmapPlatformDevice, as above.
  29   // If |is_opaque| is false, the bitmap is initialized to 0.
  30   static BitmapPlatformDevice* CreateAndClear(int width, int height,
  31                                               bool is_opaque);
  32
  33   // This doesn't take ownership of |data|. If |data| is null, the bitmap
  34   // is not initialized to 0.
  35   static BitmapPlatformDevice* Create(int width, int height, bool is_opaque,
  36                                       uint8_t* data);
  37
  38   // Create a BitmapPlatformDevice from an already constructed bitmap;
  39   // you should probably be using Create(). This may become private later if
  40   // we ever have to share state between some native drawing UI and Skia, like
  41   // the Windows and Mac versions of this class do.
  42   explicit BitmapPlatformDevice(const SkBitmap& other);
  43   virtual ~BitmapPlatformDevice();
  44
  45   virtual PlatformSurface BeginPlatformPaint() OVERRIDE;
  46   virtual void DrawToNativeContext(PlatformSurface surface, int x, int y,
  47                                    const PlatformRect* src_rect) OVERRIDE;
  48
  49  protected:
  50   virtual SkBaseDevice* onCreateDevice(const SkImageInfo& info,
  51                                        Usage usage) OVERRIDE;
  52
  53  private:
  54   DISALLOW_COPY_AND_ASSIGN(BitmapPlatformDevice);
  55 };
  56
  57 }  // namespace skia
  58
  59 #endif  // SKIA_EXT_BITMAP_PLATFORM_DEVICE_SKIA_H_