[WIP] Move ImageDecoders to SkCodec

third_party/WebKit/Source/platform/image-decoders/webp/WEBPImageDecoder.h

-/*
- * Copyright (C) 2010 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.
- * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
- *     its contributors may be used to endorse or promote products derived
- *     from this software without specific prior written permission.
- *
- * 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 WEBPImageDecoder_h
-#define WEBPImageDecoder_h
-
-#include "platform/image-decoders/ImageDecoder.h"
-#include "third_party/skia/include/core/SkData.h"
-#include "webp/decode.h"
-#include "webp/demux.h"
-
-namespace blink {
-
-class PLATFORM_EXPORT WEBPImageDecoder final : public ImageDecoder {
-  WTF_MAKE_NONCOPYABLE(WEBPImageDecoder);
-
- public:
-  WEBPImageDecoder(AlphaOption, const ColorBehavior&, size_t max_decoded_bytes);
-  ~WEBPImageDecoder() override;
-
-  // ImageDecoder:
-  String FilenameExtension() const override { return "webp"; }
-  void OnSetData(SegmentReader* data) override;
-  int RepetitionCount() const override;
-  bool FrameIsCompleteAtIndex(size_t) const override;
-  float FrameDurationAtIndex(size_t) const override;
-
- private:
-  // ImageDecoder:
-  virtual void DecodeSize() { UpdateDemuxer(); }
-  size_t DecodeFrameCount() override;
-  void InitializeNewFrame(size_t) override;
-  void Decode(size_t) override;
-
-  bool DecodeSingleFrame(const uint8_t* data_bytes,
-                         size_t data_size,
-                         size_t frame_index);
-
-  // For WebP images, the frame status needs to be FrameComplete to decode
-  // subsequent frames that depend on frame |index|. The reason for this is that
-  // WebP uses the previous frame for alpha blending, in ApplyPostProcessing().
-  //
-  // Before calling this, verify that frame |index| exists by checking that
-  // |index| is smaller than |frame_buffer_cache_|.size().
-  bool FrameStatusSufficientForSuccessors(size_t index) override {
-    DCHECK(index < frame_buffer_cache_.size());
-    return frame_buffer_cache_[index].GetStatus() == ImageFrame::kFrameComplete;
-  }
-
-  WebPIDecoder* decoder_;
-  WebPDecBuffer decoder_buffer_;
-  int format_flags_;
-  bool frame_background_has_alpha_;
-
-  void ReadColorProfile();
-  bool UpdateDemuxer();
-
-  // Set |frame_background_has_alpha_| based on this frame's characteristics.
-  // Before calling this method, the caller must verify that the frame exists.
-  void OnInitFrameBuffer(size_t frame_index) override;
-
-  // When the blending method of this frame is BlendAtopPreviousFrame, the
-  // previous frame's buffer is necessary to decode this frame in
-  // ApplyPostProcessing, so we can't take over the data. Before calling this
-  // method, the caller must verify that the frame exists.
-  bool CanReusePreviousFrameBuffer(size_t frame_index) const override;
-
-  void ApplyPostProcessing(size_t frame_index);
-  void ClearFrameBuffer(size_t frame_index) override;
-
-  WebPDemuxer* demux_;
-  WebPDemuxState demux_state_;
-  bool have_already_parsed_this_data_;
-  int repetition_count_;
-  int decoded_height_;
-
-  typedef void (*AlphaBlendFunction)(ImageFrame&, ImageFrame&, int, int, int);
-  AlphaBlendFunction blend_function_;
-
-  void Clear();
-  void ClearDecoder();
-
-  // FIXME: Update libwebp's API so it does not require copying the data on each
-  // update.
-  sk_sp<SkData> consolidated_data_;
-};
-
-}  // namespace blink
-
-#endif