1 /* 2 * Copyright (C) 2013 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef RASTERMILL_FRAMESQUENCE_WEBP_H 18 #define RASTERMILL_FRAMESQUENCE_WEBP_H 19 20 #include "config.h" 21 #include "webp/decode.h" 22 #include "webp/demux.h" 23 24 #include "Stream.h" 25 #include "Color.h" 26 #include "FrameSequence.h" 27 28 // Parser for a possibly-animated WebP bitstream. 29 class FrameSequence_webp : public FrameSequence { 30 public: 31 FrameSequence_webp(Stream* stream); 32 virtual ~FrameSequence_webp(); 33 34 virtual int getWidth() const { 35 return WebPDemuxGetI(mDemux, WEBP_FF_CANVAS_WIDTH); 36 } 37 38 virtual int getHeight() const { 39 return WebPDemuxGetI(mDemux, WEBP_FF_CANVAS_HEIGHT); 40 } 41 42 virtual bool isOpaque() const { 43 return !(mFormatFlags & ALPHA_FLAG); 44 } 45 46 virtual int getFrameCount() const { 47 return WebPDemuxGetI(mDemux, WEBP_FF_FRAME_COUNT); 48 } 49 50 virtual int getDefaultLoopCount() const { 51 return mLoopCount; 52 } 53 54 virtual jobject getRawByteBuffer() const { 55 return mRawByteBuffer; 56 } 57 58 virtual FrameSequenceState* createState() const; 59 60 WebPDemuxer* getDemuxer() const { return mDemux; } 61 62 bool isKeyFrame(size_t frameNr) const { return mIsKeyFrame[frameNr]; } 63 64 private: 65 void constructDependencyChain(); 66 67 WebPData mData; 68 WebPDemuxer* mDemux; 69 int mLoopCount; 70 uint32_t mFormatFlags; 71 // mIsKeyFrame[i] is true if ith canvas can be constructed without decoding any prior frames. 72 bool* mIsKeyFrame; 73 jobject mRawByteBuffer; 74 }; 75 76 // Produces frames of a possibly-animated WebP file for display. 77 class FrameSequenceState_webp : public FrameSequenceState { 78 public: 79 FrameSequenceState_webp(const FrameSequence_webp& frameSequence); 80 virtual ~FrameSequenceState_webp(); 81 82 // Returns frame's delay time in milliseconds. 83 virtual long drawFrame(int frameNr, 84 Color8888* outputPtr, int outputPixelStride, int previousFrameNr); 85 86 private: 87 void initializeFrame(const WebPIterator& currIter, Color8888* currBuffer, int currStride, 88 const WebPIterator& prevIter, const Color8888* prevBuffer, int prevStride); 89 bool decodeFrame(const WebPIterator& iter, Color8888* currBuffer, int currStride, 90 const WebPIterator& prevIter, const Color8888* prevBuffer, int prevStride); 91 92 const FrameSequence_webp& mFrameSequence; 93 WebPDecoderConfig mDecoderConfig; 94 Color8888* mPreservedBuffer; 95 }; 96 97 #endif //RASTERMILL_FRAMESQUENCE_WEBP_H 98