mirror of
https://github.com/libretro/scummvm.git
synced 2024-12-13 21:31:53 +00:00
110 lines
3.1 KiB
C++
110 lines
3.1 KiB
C++
/* 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_DITHER_H
|
|
#define GRAPHICS_DITHER_H
|
|
|
|
#include "common/util.h"
|
|
#include "common/stream.h"
|
|
|
|
namespace Graphics {
|
|
|
|
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);
|
|
};
|
|
|
|
} // End of namespace Graphics
|
|
|
|
#endif
|