1 files changed, 92 insertions, 0 deletions
diff --git a/framesequence/jni/FrameSequence_webp.h b/framesequence/jni/FrameSequence_webp.h
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+++ b/framesequence/jni/FrameSequence_webp.h
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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 {
+        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