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   // This doesn't take ownership of |data|. If |data| is null, the bitmap
  29   // is not initialized to 0.
  30   static BitmapPlatformDevice* Create(int width, int height, bool is_opaque,
  31                                       uint8_t* data);
  32
  33   // Create a BitmapPlatformDevice from an already constructed bitmap;
  34   // you should probably be using Create(). This may become private later if
  35   // we ever have to share state between some native drawing UI and Skia, like
  36   // the Windows and Mac versions of this class do.
  37   explicit BitmapPlatformDevice(const SkBitmap& other);
  38   ~BitmapPlatformDevice() override;
  39
  40   PlatformSurface BeginPlatformPaint() override;
  41
  42  protected:
  43   SkBaseDevice* onCreateCompatibleDevice(const CreateInfo& info) override;
  44
  45  private:
  46   DISALLOW_COPY_AND_ASSIGN(BitmapPlatformDevice);
  47 };
  48
  49 }  // namespace skia
  50
  51 #endif  // SKIA_EXT_BITMAP_PLATFORM_DEVICE_SKIA_H_