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-rw-r--r--graphics/jpeg.h118
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diff --git a/graphics/jpeg.h b/graphics/jpeg.h
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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.
- *
- * $URL$
- * $Id$
- *
- */
-
-#ifndef GRAPHICS_JPEG_H
-#define GRAPHICS_JPEG_H
-
-#include "common/stream.h"
-#include "graphics/surface.h"
-
-namespace Graphics {
-
-#define JPEG_MAX_QUANT_TABLES 4
-#define JPEG_MAX_HUFF_TABLES 2
-
-class JPEG {
-public:
- JPEG();
- ~JPEG();
-
- bool read(Common::SeekableReadStream *str);
- Surface *getComponent(uint c);
-
-private:
- void reset();
-
- Common::SeekableReadStream *_str;
- uint16 _w, _h;
-
- // Image components
- uint8 _numComp;
- struct Component {
- // Global values
- uint8 id;
- uint8 factorH;
- uint8 factorV;
- uint8 quantTableSelector;
-
- // Scan specific values
- uint8 DCentropyTableSelector;
- uint8 ACentropyTableSelector;
- int16 DCpredictor;
-
- // Result image for this component
- Surface surface;
- } *_components;
-
- // Scan components
- uint8 _numScanComp;
- Component **_scanComp;
- Component *_currentComp;
-
- // Maximum sampling factors, used to calculate the interleaving of the MCU
- uint8 _maxFactorV;
- uint8 _maxFactorH;
-
- // Zig-Zag order
- static uint8 _zigZagOrder[64];
-
- // Quantization tables
- uint16 *_quant[JPEG_MAX_QUANT_TABLES];
-
- // Huffman tables
- struct HuffmanTable {
- uint8 count;
- uint8 *values;
- uint8 *sizes;
- uint16 *codes;
- } _huff[2 * JPEG_MAX_HUFF_TABLES];
-
- // Marker read functions
- bool readJFIF();
- bool readSOF0();
- bool readDHT();
- bool readSOS();
- bool readDQT();
-
- // Helper functions
- bool readMCU(uint16 xMCU, uint16 yMCU);
- bool readDataUnit(uint16 x, uint16 y);
- int16 readDC();
- void readAC(int16 *out);
- int16 readSignedBits(uint8 numBits);
-
- // Huffman decoding
- uint8 readHuff(uint8 table);
- uint8 readBit();
- uint8 _bitsData;
- uint8 _bitsNumber;
-
- // Discrete Cosine Transformation
- float idct(int x, int y, int weight, int fx, int fy);
-};
-
-} // End of Graphics namespace
-
-#endif // GRAPHICS_JPEG_H