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/*
* 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 {
if (!mDemux) {
return 0;
}
return WebPDemuxGetI(mDemux, WEBP_FF_CANVAS_WIDTH);
}
virtual int getHeight() const {
if (!mDemux) {
return 0;
}
return WebPDemuxGetI(mDemux, WEBP_FF_CANVAS_HEIGHT);
}
virtual bool isOpaque() const {
return !(mFormatFlags & ALPHA_FLAG);
}
virtual int getFrameCount() const {
if (!mDemux) {
return 0;
}
return WebPDemuxGetI(mDemux, WEBP_FF_FRAME_COUNT);
}
virtual int getDefaultLoopCount() const {
return mLoopCount;
}
virtual jobject getRawByteBuffer() const {
return mRawByteBuffer;
}
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;
jobject mRawByteBuffer;
};
// 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
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