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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 3 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, see <http://www.gnu.org/licenses/>.
*
*/
#ifndef STARK_XMG_H
#define STARK_XMG_H
#include "common/stream.h"
namespace Graphics {
struct Surface;
}
namespace Stark {
namespace Formats {
/**
* XMG (still image) decoder
*/
class XMGDecoder {
public:
static Graphics::Surface *decode(Common::ReadStream *stream);
static void readSize(Common::ReadStream *stream, uint &width, uint &height);
private:
explicit XMGDecoder(Common::ReadStream *stream);
struct Block {
uint32 a1, a2;
uint32 b1, b2;
};
void readHeader();
Graphics::Surface *decodeImage();
Block decodeBlock(byte op);
void drawBlock(const Block &block, Graphics::Surface *surface);
Block processYCrCb();
Block processTrans();
Block processRGB();
uint32 _width;
uint32 _height;
uint32 _currX;
uint32 _currY;
Common::ReadStream *_stream;
/**
* The transparency color in the RGB and transparency blocks.
* In the output surface, the transparent color is black with zero
* alpha. So the images are effectively pre-multiplied alpha.
*/
uint32 _transColor;
};
} // End of namespace Formats
} // End of namespace Stark
#endif // STARK_XMG_H
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