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 
getWidth()32     virtual int getWidth() const {
33         return mGif ? mGif->SWidth : 0;
34     }
35 
getHeight()36     virtual int getHeight() const {
37         return mGif ? mGif->SHeight : 0;
38     }
39 
isOpaque()40     virtual bool isOpaque() const {
41         return (mBgColor & COLOR_8888_ALPHA_MASK) == COLOR_8888_ALPHA_MASK;
42     }
43 
getFrameCount()44     virtual int getFrameCount() const {
45         return mGif ? mGif->ImageCount : 0;
46     }
47 
getDefaultLoopCount()48     virtual int getDefaultLoopCount() const {
49         return mLoopCount;
50     }
51 
getRawByteBuffer()52     virtual jobject getRawByteBuffer() const {
53         return NULL;
54     }
55 
56     virtual FrameSequenceState* createState() const;
57 
getGif()58     GifFileType* getGif() const { return mGif; }
getBackgroundColor()59     Color8888 getBackgroundColor() const { return mBgColor; }
getPreservedFrame(int frameIndex)60     bool getPreservedFrame(int frameIndex) const { return mPreservedFrames[frameIndex]; }
getRestoringFrame(int 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