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      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_GIF_H
     18 #define RASTERMILL_FRAMESQUENCE_GIF_H
     19 
     20 #include "config.h"
     21 #include "gif_lib.h"
     22 
     23 #include "Stream.h"
     24 #include "Color.h"
     25 #include "FrameSequence.h"
     26 
     27 class FrameSequence_gif : public FrameSequence {
     28 public:
     29     FrameSequence_gif(Stream* stream);
     30     virtual ~FrameSequence_gif();
     31 
     32     virtual int getWidth() const {
     33         return mGif ? mGif->SWidth : 0;
     34     }
     35 
     36     virtual int getHeight() const {
     37         return mGif ? mGif->SHeight : 0;
     38     }
     39 
     40     virtual bool isOpaque() const {
     41         return (mBgColor & COLOR_8888_ALPHA_MASK) == COLOR_8888_ALPHA_MASK;
     42     }
     43 
     44     virtual int getFrameCount() const {
     45         return mGif ? mGif->ImageCount : 0;
     46     }
     47 
     48     virtual int getDefaultLoopCount() const {
     49         return mLoopCount;
     50     }
     51 
     52     virtual jobject getRawByteBuffer() const {
     53         return NULL;
     54     }
     55 
     56     virtual FrameSequenceState* createState() const;
     57 
     58     GifFileType* getGif() const { return mGif; }
     59     Color8888 getBackgroundColor() const { return mBgColor; }
     60     bool getPreservedFrame(int frameIndex) const { return mPreservedFrames[frameIndex]; }
     61     int getRestoringFrame(int frameIndex) const { return mRestoringFrames[frameIndex]; }
     62 
     63 private:
     64     GifFileType* mGif;
     65     int mLoopCount;
     66     Color8888 mBgColor;
     67 
     68     // array of bool per frame - if true, frame data is used by a later DISPOSE_PREVIOUS frame
     69     bool* mPreservedFrames;
     70 
     71     // array of ints per frame - if >= 0, points to the index of the preserve that frame needs
     72     int* mRestoringFrames;
     73 };
     74 
     75 class FrameSequenceState_gif : public FrameSequenceState {
     76 public:
     77     FrameSequenceState_gif(const FrameSequence_gif& frameSequence);
     78     virtual ~FrameSequenceState_gif();
     79 
     80     // returns frame's delay time in ms
     81     virtual long drawFrame(int frameNr,
     82             Color8888* outputPtr, int outputPixelStride, int previousFrameNr);
     83 
     84 private:
     85     void savePreserveBuffer(Color8888* outputPtr, int outputPixelStride, int frameNr);
     86     void restorePreserveBuffer(Color8888* outputPtr, int outputPixelStride);
     87 
     88     const FrameSequence_gif& mFrameSequence;
     89     Color8888* mPreserveBuffer;
     90     int mPreserveBufferFrame;
     91 };
     92 
     93 #endif //RASTERMILL_FRAMESQUENCE_GIF_H
     94