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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/>.
*/
#include "graphics/palette.h"
namespace Graphics {
static const byte EGA_PALETTE[16][3] = {
{ 0x00, 0x00, 0x00 }, { 0x00, 0x00, 0xaa }, { 0x00, 0xaa, 0x00 },
{ 0x00, 0xaa, 0xaa }, { 0xaa, 0x00, 0x00 }, { 0xaa, 0x00, 0xaa },
{ 0xaa, 0x55, 0x00 }, { 0xaa, 0xaa, 0xaa }, { 0x55, 0x55, 0x55 },
{ 0x55, 0x55, 0xff }, { 0x55, 0xff, 0x55 }, { 0x55, 0xff, 0xff },
{ 0xff, 0x55, 0x55 }, { 0xff, 0x55, 0xff }, { 0xff, 0xff, 0x55 },
{ 0xff, 0xff, 0xff }
};
Palette::Palette(uint size) : _data(nullptr), _size(size) {
if (_size > 0) {
_data = new byte[_size * 3]();
}
}
Palette::Palette(const byte *data, uint size) : _data(nullptr), _size(0) {
if (data && size > 0) {
_size = size;
_data = new byte[_size * 3]();
memcpy(_data, data, _size * 3);
}
}
Palette::Palette(const Palette &p) : _data(nullptr), _size(p._size) {
if (_size > 0) {
_data = new byte[_size * 3]();
memcpy(_data, p._data, _size * 3);
}
}
Palette::~Palette() {
delete[] _data;
}
Palette Palette::createEGAPalette() {
return Palette(&EGA_PALETTE[0][0], 16);
}
Palette &Palette::operator=(const Palette &rhs) {
delete[] _data;
_data = nullptr;
_size = rhs._size;
if (_size > 0) {
_data = new byte[_size * 3]();
memcpy(_data, rhs._data, _size * 3);
}
return *this;
}
bool Palette::equals(const Palette &p) const {
return p._size == _size && !memcmp(_data, p._data, p._size * 3);
}
bool Palette::contains(const Palette& p) const {
return p._size <= _size && !memcmp(_data, p._data, p._size * 3);
}
byte Palette::findBestColor(byte cr, byte cg, byte cb, bool useNaiveAlg) const {
uint bestColor = 0;
uint32 min = 0xFFFFFFFF;
if (useNaiveAlg) {
for (uint i = 0; i < _size; i++) {
int r = _data[3 * i + 0] - cr;
int g = _data[3 * i + 1] - cg;
int b = _data[3 * i + 2] - cb;
uint32 distWeighted = 3 * r * r + 5 * g * g + 2 * b * b;
if (distWeighted < min) {
bestColor = i;
min = distWeighted;
}
}
} else {
for (uint i = 0; i < _size; ++i) {
int rmean = (_data[3 * i + 0] + cr) / 2;
int r = _data[3 * i + 0] - cr;
int g = _data[3 * i + 1] - cg;
int b = _data[3 * i + 2] - cb;
uint32 distSquared = (((512 + rmean) * r * r) >> 8) + 4 * g * g + (((767 - rmean) * b * b) >> 8);
if (distSquared < min) {
bestColor = i;
min = distSquared;
}
}
}
return bestColor;
}
void Palette::clear() {
if (_size > 0)
memset(_data, 0, _size);
}
void Palette::set(const byte *colors, uint start, uint num) {
assert(start < _size && (start + num) <= _size);
memcpy(_data + 3 * start, colors, 3 * num);
}
void Palette::set(const Palette &p, uint start, uint num) {
assert(start < _size && (start + num) <= _size);
memcpy(_data + 3 * start, p._data, 3 * num);
}
void Palette::grab(byte *colors, uint start, uint num) const {
assert(start < _size && (start + num) <= _size);
memcpy(colors, _data + 3 * start, 3 * num);
}
void Palette::grab(Palette &p, uint start, uint num) const {
assert(start < _size && (start + num) <= _size);
memcpy(p._data, _data + 3 * start, 3 * num);
}
PaletteLookup::PaletteLookup(): _palette(256) {
_paletteSize = 0;
}
PaletteLookup::PaletteLookup(const byte *palette, uint len) : _palette(256) {
_paletteSize = len;
_palette.set(palette, 0, len);
}
bool PaletteLookup::setPalette(const byte *palette, uint len) {
// Check if the passed palette matched the one we have
if (len == _paletteSize && !memcmp(_palette.data(), palette, len * 3))
return false;
_paletteSize = len;
_palette.set(palette, 0, len);
_colorHash.clear();
return true;
}
byte PaletteLookup::findBestColor(byte cr, byte cg, byte cb, bool useNaiveAlg) {
if (_paletteSize == 0) {
warning("PaletteLookup::findBestColor(): Palette was not set");
return 0;
}
uint32 color = cr << 16 | cg << 8 | cb;
if (_colorHash.contains(color))
return _colorHash[color];
uint bestColor = _palette.findBestColor(cr, cg, cb, useNaiveAlg);
_colorHash[color] = bestColor;
return bestColor;
}
uint32 *PaletteLookup::createMap(const byte *srcPalette, uint len, bool useNaiveAlg) {
if (len <= _paletteSize && memcmp(_palette.data(), srcPalette, len * 3) == 0)
return nullptr;
uint32 *map = new uint32[len];
for (uint i = 0; i < len; i++) {
byte r = *srcPalette++;
byte g = *srcPalette++;
byte b = *srcPalette++;
map[i] = findBestColor(r, g, b, useNaiveAlg);
}
return map;
}
} // end of namespace Graphics
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