mirror of
https://github.com/libretro/scummvm.git
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98 lines
2.7 KiB
C++
98 lines
2.7 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "graphics/palette.h"
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namespace Graphics {
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PaletteLookup::PaletteLookup() {
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_paletteSize = 0;
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}
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PaletteLookup::PaletteLookup(const byte *palette, uint len) {
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_paletteSize = len;
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memcpy(_palette, palette, len * 3);
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}
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bool PaletteLookup::setPalette(const byte *palette, uint len) {
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// Check if the passed palette matched the one we have
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if (len == _paletteSize && !memcmp(_palette, palette, len * 3))
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return false;
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_paletteSize = len;
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memcpy(_palette, palette, len * 3);
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_colorHash.clear();
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return true;
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}
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byte PaletteLookup::findBestColor(byte cr, byte cg, byte cb, bool useNaiveAlg) {
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if (_paletteSize == 0) {
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warning("PaletteLookup::findBestColor(): Palette was not set");
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return 0;
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}
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uint bestColor = 0;
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double min = 0xFFFFFFFF;
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uint32 color = cr << 16 | cg << 8 | cb;
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if (_colorHash.contains(color))
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return _colorHash[color];
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if (useNaiveAlg) {
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byte *palettePtr = _palette;
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for (uint i = 0; i < _paletteSize; i++) {
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int redSquareDiff = (cr - palettePtr[0]) * (cr - palettePtr[0]);
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int greenSquareDiff = (cg - palettePtr[1]) * (cg - palettePtr[1]);
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int blueSquareDiff = (cb - palettePtr[2]) * (cb - palettePtr[2]);
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int weightedColorError = 3 * redSquareDiff + 5 * greenSquareDiff + 2 * blueSquareDiff;
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if (weightedColorError < min) {
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bestColor = i;
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min = weightedColorError;
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}
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palettePtr += 3;
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}
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} else {
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for (uint i = 0; i < _paletteSize; ++i) {
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int rmean = (*(_palette + 3 * i + 0) + cr) / 2;
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int r = *(_palette + 3 * i + 0) - cr;
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int g = *(_palette + 3 * i + 1) - cg;
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int b = *(_palette + 3 * i + 2) - cb;
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double dist = sqrt((((512 + rmean) * r * r) >> 8) + 4 * g * g + (((767 - rmean) * b * b) >> 8));
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if (min > dist) {
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bestColor = i;
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min = dist;
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}
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}
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}
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_colorHash[color] = bestColor;
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return bestColor;
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}
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} // end of namespace Graphics
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