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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.
*
* $URL$
* $Id$
*
*/
/* Intel Indeo 3 decompressor, derived from ffmpeg.
*
* Original copyright note:
* Intel Indeo 3 (IV31, IV32, etc.) video decoder for ffmpeg
* written, produced, and directed by Alan Smithee
*/
#ifndef GOB_INDEO3_H
#define GOB_INDEO3_H
#include "common/stream.h"
namespace Gob {
class PaletteLUT {
public:
enum PaletteFormat {
kPaletteRGB,
kPaletteYUV
};
inline static void YUV2RGB(byte y, byte u, byte v, byte &r, byte &g, byte &b) {
r = CLIP<int>(y + ((1357 * (v - 128)) >> 10), 0, 255);
g = CLIP<int>(y - (( 691 * (v - 128)) >> 10) - ((333 * (u - 128)) >> 10), 0, 255);
b = CLIP<int>(y + ((1715 * (u - 128)) >> 10), 0, 255);
}
inline static void RGB2YUV(byte r, byte g, byte b, byte &y, byte &u, byte &v) {
y = CLIP<int>( ((r * 306) >> 10) + ((g * 601) >> 10) + ((b * 117) >> 10) , 0, 255);
u = CLIP<int>(-((r * 172) >> 10) - ((g * 340) >> 10) + ((b * 512) >> 10) + 128, 0, 255);
v = CLIP<int>( ((r * 512) >> 10) - ((g * 429) >> 10) - ((b * 83) >> 10) + 128, 0, 255);
}
PaletteLUT(byte depth, PaletteFormat format);
~PaletteLUT();
void setPalette(const byte *palette, PaletteFormat format, byte depth);
void buildNext();
void getEntry(byte index, byte &c1, byte &c2, byte &c3) const;
byte findNearest(byte c1, byte c2, byte c3);
byte findNearest(byte c1, byte c2, byte c3, byte &nC1, byte &nC2, byte &nC3);
bool save(Common::WriteStream &stream);
bool load(Common::SeekableReadStream &stream);
private:
byte _depth1, _depth2;
byte _shift;
uint32 _dim1, _dim2, _dim3;
PaletteFormat _format;
byte _lutPal[768];
byte _realPal[768];
uint32 _got;
byte *_gots;
byte *_lut;
void build(int d1);
inline int getIndex(byte c1, byte c2, byte c3) const;
inline void plotEntry(int x, int y, int z, byte e, byte *filled, int &free);
};
// The Sierra-2-4A ("Filter Light") dithering algorithm
class SierraLight {
public:
SierraLight(int16 width, int16 height, PaletteLUT *palLUT);
~SierraLight();
void newFrame();
void nextLine();
byte dither(byte c1, byte c2, byte c3, uint32 x);
protected:
int16 _width, _height;
PaletteLUT *_palLUT;
int32 *_errorBuf;
int32 *_errors[2];
int _curLine;
inline void getErrors(uint32 x, int32 &eC1, int32 &eC2, int32 &eC3);
inline void addErrors(uint32 x, int32 eC1, int32 eC2, int32 eC3);
};
class Indeo3 {
public:
enum DitherAlgorithm {
kDitherNone = 0,
kDitherSierraLight
};
Indeo3(int16 width, int16 height, PaletteLUT *palLUT);
~Indeo3();
static bool isIndeo3(byte *data, uint32 dataLen);
void setDither(DitherAlgorithm dither);
bool decompressFrame(byte *inData, uint32 dataLen,
byte *outData, uint16 width, uint16 height);
private:
static const int _corrector_type_0[24];
static const int _corrector_type_2[8];
static const uint32 correction[];
static const uint32 correctionloworder[];
static const uint32 correctionhighorder[];
struct YUVBufs {
byte *Ybuf;
byte *Ubuf;
byte *Vbuf;
byte *the_buf;
uint32 the_buf_size;
uint16 y_w, y_h;
uint16 uv_w, uv_h;
};
int16 _width;
int16 _height;
YUVBufs _iv_frame[2];
YUVBufs *_cur_frame;
YUVBufs *_ref_frame;
byte *_ModPred;
uint16 *_corrector_type;
PaletteLUT *_palLUT;
DitherAlgorithm _dither;
SierraLight *_ditherSL;
struct BlitState {
uint32 curX, curY;
uint16 widthY, widthUV;
uint16 heightY, heightUV;
uint16 uwidthUV, uwidthOut;
uint16 uheightUV, uheightOut;
uint16 scaleWYUV, scaleWYOut;
uint16 scaleHYUV, scaleHYOut;
uint16 lineWidthOut, lineHeightOut;
byte *bufY, *bufU, *bufV, *bufOut;
};
void buildModPred();
void allocFrames();
void decodeChunk(byte *cur, byte *ref, int width, int height,
const byte *buf1, uint32 fflags2, const byte *hdr,
const byte *buf2, int min_width_160);
void blitFrame(BlitState &s);
void blitLine(BlitState &s);
void blitLineDither(BlitState &s);
};
} // End of namespace Gob
#endif // GOB_INDEO3_H
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