text: /*
   * Copyright (C) 2013 Google Inc. All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1.  Redistributions of source code must retain the above copyright
   *     notice, this list of conditions and the following disclaimer.
   * 2.  Redistributions in binary form must reproduce the above copyright
   *     notice, this list of conditions and the following disclaimer in the
   *     documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
   * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
   * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #ifndef DecodingImageGenerator_h
  #define DecodingImageGenerator_h
  
  #include "SkImageGenerator.h"
  #include "SkImageInfo.h"
  
  #include "platform/PlatformExport.h"
  #include "wtf/RefPtr.h"
  
  class SkData;
  
  namespace blink {
  
  class ImageFrameGenerator;
  
  // Implements SkImageGenerator and used by SkPixelRef to populate a discardable
  // memory with decoded pixels.
  //
  // This class does not own an ImageDecode. It does not own encoded data. It serves
  // as and adapter to ImageFrameGenerator which actually performs decoding.
  class PLATFORM_EXPORT DecodingImageGenerator final : public SkImageGenerator {
  public:
      static SkImageGenerator* create(SkData*);
  
      DecodingImageGenerator(PassRefPtr<ImageFrameGenerator>, const SkImageInfo&, size_t index);
      ~DecodingImageGenerator() override;
  
      void setGenerationId(size_t id) { m_generationId = id; }
  
  protected:
      SkData* onRefEncodedData() override;
      Result onGetPixels(const SkImageInfo&, void* pixels, size_t rowBytes, const Options&, SkPMColor ctable[], int* ctableCount) override;
      bool onGetYUV8Planes(SkISize sizes[3], void* planes[3], size_t rowBytes[3], SkYUVColorSpace*) override;
  
  private:
      RefPtr<ImageFrameGenerator> m_frameGenerator;
      size_t m_frameIndex;
      size_t m_generationId;
  };
  
  } // namespace blink
  
  #endif // DecodingImageGenerator_h_
  