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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#ifndef ZVISION_RLF_ANIMATION_H
#define ZVISION_RLF_ANIMATION_H
#include "common/file.h"
#include "graphics/surface.h"
namespace Common {
class String;
}
namespace ZVision {
class RlfAnimation {
public:
RlfAnimation(const Common::String &fileName, bool stream = true);
~RlfAnimation();
private:
enum EncodingType {
Masked,
Simple
};
struct Frame {
EncodingType type;
int8 *encodedData;
uint32 encodedSize;
};
private:
Common::File _file;
bool _stream;
uint _lastFrameRead;
uint _frameCount;
uint _width;
uint _height;
uint32 _frameTime; // In milliseconds
Frame *_frames;
Common::Array<uint> _completeFrames;
int _currentFrame;
Graphics::Surface _currentFrameBuffer;
uint32 _frameBufferByteSize;
public:
uint frameCount() { return _frameCount; }
uint width() { return _width; }
uint height() { return _height; }
uint32 frameTime() { return _frameTime; }
/**
* Seeks to the frameNumber and updates the internal Surface with
* the new frame data. If frameNumber == -1, it only sets _currentFrame,
* the internal Surface is unchanged. This function requires _stream = false
*
* @param frameNumber The frame number to seek to
*/
void seekToFrame(int frameNumber);
/**
* Returns the pixel data of the frame specified. It will try to use
* getNextFrame() if possible. If not, it uses seekToFrame() to
* update the internal Surface and then returns a pointer to it.
* This function requires _stream = false
*
* @param frameNumber The frame number to get data for
* @return A pointer to the pixel data. Do NOT delete this.
*/
const Graphics::Surface *getFrameData(uint frameNumber);
/**
* Returns the pixel data of the next frame. It is up to the user to
* check if the next frame is valid before calling this.
* IE. Use endOfAnimation()
*
* @return A pointer to the pixel data. Do NOT delete this.
*/
const Graphics::Surface *getNextFrame();
/**
* @return Is the currentFrame is the last frame in the animation?
*/
bool endOfAnimation() { return _currentFrame == (int)_frameCount - 1; }
private:
/**
* Reads in the header of the RLF file
*
* @return Will return false if the header magic number is wrong
*/
bool readHeader();
/**
* Reads the next frame from the RLF file, stores the data in
* a Frame object, then returns the object
*
* @return A Frame object representing the frame data
*/
Frame readNextFrame();
/**
* Applies the frame corresponding to frameNumber on top of _currentFrameBuffer.
* This function requires _stream = false so it can look up the Frame object
* referenced by frameNumber.
*
* @param frameNumber The frame number to apply to _currentFrameBuffer
*/
void applyFrameToCurrent(uint frameNumber);
/**
* Applies the data from a Frame object on top of a _currentFrameBuffer.
*
* @param frame A Frame object to apply to _currentFrameBuffer
*/
void applyFrameToCurrent(const RlfAnimation::Frame &frame);
/**
* Decode frame data that uses masked run length encoding. This is the encoding
* used by P-frames.
*
* @param source The source pixel data
* @param dest The destination buffer
* @param sourceSize The size of the source pixel data
* @param destSize The size of the destination buffer
*/
void decodeMaskedRunLengthEncoding(int8 *source, int8 *dest, uint32 sourceSize, uint32 destSize) const;
/**
* Decode frame data that uses simple run length encoding. This is the encoding
* used by I-frames.
*
* @param source The source pixel data
* @param dest The destination buffer
* @param sourceSize The size of the source pixel data
* @param destSize The size of the destination buffer
*/
void decodeSimpleRunLengthEncoding(int8 *source, int8 *dest, uint32 sourceSize, uint32 destSize) const;
};
} // End of namespace ZVision
#endif
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