| /* |
| * Copyright (C) 2013 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef RASTERMILL_FRAMESQUENCE_WEBP_H |
| #define RASTERMILL_FRAMESQUENCE_WEBP_H |
| |
| #include "config.h" |
| #include "webp/decode.h" |
| #include "webp/demux.h" |
| |
| #include "Stream.h" |
| #include "Color.h" |
| #include "FrameSequence.h" |
| |
| // Parser for a possibly-animated WebP bitstream. |
| class FrameSequence_webp : public FrameSequence { |
| public: |
| FrameSequence_webp(Stream* stream); |
| virtual ~FrameSequence_webp(); |
| |
| virtual int getWidth() const { |
| return WebPDemuxGetI(mDemux, WEBP_FF_CANVAS_WIDTH); |
| } |
| |
| virtual int getHeight() const { |
| return WebPDemuxGetI(mDemux, WEBP_FF_CANVAS_HEIGHT); |
| } |
| |
| virtual bool isOpaque() const { |
| return !(mFormatFlags & ALPHA_FLAG); |
| } |
| |
| virtual int getFrameCount() const { |
| return WebPDemuxGetI(mDemux, WEBP_FF_FRAME_COUNT); |
| } |
| |
| virtual int getDefaultLoopCount() const { |
| return mLoopCount; |
| } |
| |
| virtual FrameSequenceState* createState() const; |
| |
| WebPDemuxer* getDemuxer() const { return mDemux; } |
| |
| bool isKeyFrame(size_t frameNr) const { return mIsKeyFrame[frameNr]; } |
| |
| private: |
| void constructDependencyChain(); |
| |
| WebPData mData; |
| WebPDemuxer* mDemux; |
| int mLoopCount; |
| uint32_t mFormatFlags; |
| // mIsKeyFrame[i] is true if ith canvas can be constructed without decoding any prior frames. |
| bool* mIsKeyFrame; |
| }; |
| |
| // Produces frames of a possibly-animated WebP file for display. |
| class FrameSequenceState_webp : public FrameSequenceState { |
| public: |
| FrameSequenceState_webp(const FrameSequence_webp& frameSequence); |
| virtual ~FrameSequenceState_webp(); |
| |
| // Returns frame's delay time in milliseconds. |
| virtual long drawFrame(int frameNr, |
| Color8888* outputPtr, int outputPixelStride, int previousFrameNr); |
| |
| private: |
| void initializeFrame(const WebPIterator& currIter, Color8888* currBuffer, int currStride, |
| const WebPIterator& prevIter, const Color8888* prevBuffer, int prevStride); |
| bool decodeFrame(const WebPIterator& iter, Color8888* currBuffer, int currStride, |
| const WebPIterator& prevIter, const Color8888* prevBuffer, int prevStride); |
| |
| const FrameSequence_webp& mFrameSequence; |
| WebPDecoderConfig mDecoderConfig; |
| Color8888* mPreservedBuffer; |
| }; |
| |
| #endif //RASTERMILL_FRAMESQUENCE_WEBP_H |