ppapi/thunk/ppb_image_data_api.h

   1 // Copyright (c) 2012 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 PPAPI_THUNK_PPB_IMAGE_DATA_API_H_
   6 #define PPAPI_THUNK_PPB_IMAGE_DATA_API_H_
   7
   8 #include "ppapi/c/pp_bool.h"
   9 #include "ppapi/c/ppb_image_data.h"
  10
  11 class SkCanvas;
  12
  13 namespace ppapi {
  14 namespace thunk {
  15
  16 class PPB_ImageData_API {
  17  public:
  18   virtual ~PPB_ImageData_API() {}
  19
  20   virtual PP_Bool Describe(PP_ImageDataDesc* desc) = 0;
  21   virtual void* Map() = 0;
  22   virtual void Unmap() = 0;
  23
  24   // Trusted inteface.
  25   virtual int32_t GetSharedMemory(int* handle, uint32_t* byte_count) = 0;
  26
  27   // Get the platform-specific canvas that backs this ImageData, if there is
  28   // one.
  29   // The canvas will be NULL:
  30   //   * If the image is not mapped.
  31   //   * Within untrusted code (which does not have skia).
  32   //   * If the ImageData is not backed by a platform-specific image buffer.
  33   //     This will be the case for ImageDatas created for use in NaCl.
  34   // For this last reason, you should prefer GetCanvas any time you don't need
  35   // a platform-specific canvas (e.g., for use with platform-specific APIs).
  36   // Anything that relies on having a PlatformCanvas will not work for ImageDat
  37   // objects created from NaCl.
  38   virtual SkCanvas* GetPlatformCanvas() = 0;
  39
  40   // Get the canvas that backs this ImageData, if there is one.
  41   // The canvas will be NULL:
  42   //   * If the image is not mapped.
  43   //   * Within untrusted code (which does not have skia).
  44   virtual SkCanvas* GetCanvas() = 0;
  45
  46   // Signal that this image is a good candidate for reuse. Call this from APIs
  47   // that receive ImageData resources of a fixed size and where the plugin will
  48   // release its reference to the ImageData. If the current implementation
  49   // supports image data reuse (only supported out-of-process) then the
  50   // ImageData will be marked and potentially cached for re-use.
  51   virtual void SetIsCandidateForReuse() = 0;
  52 };
  53
  54 }  // namespace thunk
  55 }  // namespace ppapi
  56
  57 #endif  // PPAPI_THUNK_PPB_IMAGE_DATA_API_H_