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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_FRAME_SEQUENCE_H
     18 #define RASTERMILL_FRAME_SEQUENCE_H
     19 
     20 #include "Stream.h"
     21 #include "Color.h"
     22 
     23 class FrameSequenceState {
     24 public:
     25     /**
     26      * Produces a frame of animation in the output buffer, drawing (at minimum) the delta since
     27      * previousFrameNr (the current contents of the buffer), or from scratch if previousFrameNr is
     28      * negative
     29      *
     30      * Returns frame's delay time in milliseconds.
     31      */
     32     virtual long drawFrame(int frameNr,
     33             Color8888* outputPtr, int outputPixelStride, int previousFrameNr) = 0;
     34     virtual ~FrameSequenceState() {}
     35 };
     36 
     37 class FrameSequence {
     38 public:
     39     /**
     40      * Creates a FrameSequence using data from the data stream
     41      *
     42      * Type determined by header information in the stream
     43      */
     44     static FrameSequence* create(Stream* stream);
     45 
     46     virtual ~FrameSequence() {}
     47     virtual int getWidth() const = 0;
     48     virtual int getHeight() const = 0;
     49     virtual bool isOpaque() const = 0;
     50     virtual int getFrameCount() const = 0;
     51     virtual int getDefaultLoopCount() const = 0;
     52     virtual jobject getRawByteBuffer() const = 0;
     53 
     54     virtual FrameSequenceState* createState() const = 0;
     55 };
     56 
     57 #endif //RASTERMILL_FRAME_SEQUENCE_H
     58