313 lines
8.3 KiB
C
313 lines
8.3 KiB
C
/* Matelight
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* Copyright (C) 2016 Sebastian Götte <code@jaseg.net>
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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 "color.h"
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#include <stdlib.h>
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#include <stdio.h>
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/* Bonus points for time wasted on C golf for improving the efficiency of this part */
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int xterm_color_index(color_t c){
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int candidate = 0;
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int best_distance = 0x7fffffff;
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for(int i=0; i<256; i++){
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/* NOTE: this ignores the alpha channel */
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color_t k = colortable[i];
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int tmp = abs(c.r - k.r);
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tmp *= tmp;
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int distance = tmp;
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if(distance > best_distance)
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continue;
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tmp = abs(c.g - k.g);
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tmp *= tmp;
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distance += tmp;
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if(distance > best_distance)
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continue;
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tmp = abs(c.b - k.b);
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tmp *= tmp;
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distance += tmp;
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if(distance > best_distance)
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continue;
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best_distance = distance;
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candidate = i;
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}
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return candidate;
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}
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/* Generated by genpal.py */
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color_t colortable[256] = {
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/* 16 default ANSI colors */
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{0x00, 0x00, 0x00, 0xff},
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{0xa8, 0x00, 0x00, 0xff},
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{0x00, 0xa8, 0x00, 0xff},
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{0xa8, 0x54, 0x00, 0xff},
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{0x00, 0x00, 0xa8, 0xff},
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{0xa8, 0x00, 0xa8, 0xff},
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{0x00, 0xa8, 0xa8, 0xff},
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{0xa8, 0xa8, 0xa8, 0xff},
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{0x54, 0x54, 0x54, 0xff},
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{0xfc, 0x54, 0x54, 0xff},
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{0x54, 0xfc, 0x54, 0xff},
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{0xfc, 0xfc, 0x54, 0xff},
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{0x54, 0x54, 0xfc, 0xff},
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{0xfc, 0x54, 0xfc, 0xff},
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{0x54, 0xfc, 0xfc, 0xff},
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{0xfc, 0xfc, 0xfc, 0xff},
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/* 6x6x6 color cube */
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{0x00, 0x00, 0x00, 0xff},
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{0x00, 0x00, 0x5f, 0xff},
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{0x00, 0x00, 0x87, 0xff},
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{0x00, 0x00, 0xaf, 0xff},
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{0x00, 0x00, 0xd7, 0xff},
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{0x00, 0x00, 0xff, 0xff},
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{0x00, 0x5f, 0x00, 0xff},
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{0x00, 0x5f, 0x5f, 0xff},
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{0x00, 0x5f, 0x87, 0xff},
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{0x00, 0x5f, 0xaf, 0xff},
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{0x00, 0x5f, 0xd7, 0xff},
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{0x00, 0x5f, 0xff, 0xff},
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{0x00, 0x87, 0x00, 0xff},
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{0x00, 0x87, 0x5f, 0xff},
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{0x00, 0x87, 0x87, 0xff},
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{0x00, 0x87, 0xaf, 0xff},
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{0x00, 0x87, 0xd7, 0xff},
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{0x00, 0x87, 0xff, 0xff},
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{0x00, 0xaf, 0x00, 0xff},
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{0x00, 0xaf, 0x5f, 0xff},
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{0x00, 0xaf, 0x87, 0xff},
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{0x00, 0xaf, 0xaf, 0xff},
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{0x00, 0xaf, 0xd7, 0xff},
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{0x00, 0xaf, 0xff, 0xff},
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{0x00, 0xd7, 0x00, 0xff},
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{0x00, 0xd7, 0x5f, 0xff},
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{0x00, 0xd7, 0x87, 0xff},
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{0x00, 0xd7, 0xaf, 0xff},
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{0x00, 0xd7, 0xd7, 0xff},
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{0x00, 0xd7, 0xff, 0xff},
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{0x00, 0xff, 0x00, 0xff},
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{0x00, 0xff, 0x5f, 0xff},
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{0x00, 0xff, 0x87, 0xff},
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{0x00, 0xff, 0xaf, 0xff},
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{0x00, 0xff, 0xd7, 0xff},
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{0x00, 0xff, 0xff, 0xff},
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{0x5f, 0x00, 0x00, 0xff},
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{0x5f, 0x00, 0x5f, 0xff},
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{0x5f, 0x00, 0x87, 0xff},
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{0x5f, 0x00, 0xaf, 0xff},
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{0x5f, 0x00, 0xd7, 0xff},
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{0x5f, 0x00, 0xff, 0xff},
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{0x5f, 0x5f, 0x00, 0xff},
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{0x5f, 0x5f, 0x5f, 0xff},
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{0x5f, 0x5f, 0x87, 0xff},
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{0x5f, 0x5f, 0xaf, 0xff},
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{0x5f, 0x5f, 0xd7, 0xff},
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{0x5f, 0x5f, 0xff, 0xff},
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{0x5f, 0x87, 0x00, 0xff},
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{0x5f, 0x87, 0x5f, 0xff},
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{0x5f, 0x87, 0x87, 0xff},
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{0x5f, 0x87, 0xaf, 0xff},
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{0x5f, 0x87, 0xd7, 0xff},
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{0x5f, 0x87, 0xff, 0xff},
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{0x5f, 0xaf, 0x00, 0xff},
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{0x5f, 0xaf, 0x5f, 0xff},
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{0x5f, 0xaf, 0x87, 0xff},
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{0x5f, 0xaf, 0xaf, 0xff},
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{0x5f, 0xaf, 0xd7, 0xff},
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{0x5f, 0xaf, 0xff, 0xff},
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{0x5f, 0xd7, 0x00, 0xff},
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{0x5f, 0xd7, 0x5f, 0xff},
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{0x5f, 0xd7, 0x87, 0xff},
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{0x5f, 0xd7, 0xaf, 0xff},
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{0x5f, 0xd7, 0xd7, 0xff},
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{0x5f, 0xd7, 0xff, 0xff},
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{0x5f, 0xff, 0x00, 0xff},
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{0x5f, 0xff, 0x5f, 0xff},
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{0x5f, 0xff, 0x87, 0xff},
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{0x5f, 0xff, 0xaf, 0xff},
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{0x5f, 0xff, 0xd7, 0xff},
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{0x5f, 0xff, 0xff, 0xff},
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{0x87, 0x00, 0x00, 0xff},
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{0x87, 0x00, 0x5f, 0xff},
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{0x87, 0x00, 0x87, 0xff},
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{0x87, 0x00, 0xaf, 0xff},
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{0x87, 0x00, 0xd7, 0xff},
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{0x87, 0x00, 0xff, 0xff},
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{0x87, 0x5f, 0x00, 0xff},
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{0x87, 0x5f, 0x5f, 0xff},
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{0x87, 0x5f, 0x87, 0xff},
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{0x87, 0x5f, 0xaf, 0xff},
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{0x87, 0x5f, 0xd7, 0xff},
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{0x87, 0x5f, 0xff, 0xff},
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{0x87, 0x87, 0x00, 0xff},
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{0x87, 0x87, 0x5f, 0xff},
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{0x87, 0x87, 0x87, 0xff},
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{0x87, 0x87, 0xaf, 0xff},
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{0x87, 0x87, 0xd7, 0xff},
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{0x87, 0x87, 0xff, 0xff},
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{0x87, 0xaf, 0x00, 0xff},
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{0x87, 0xaf, 0x5f, 0xff},
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{0x87, 0xaf, 0x87, 0xff},
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{0x87, 0xaf, 0xaf, 0xff},
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{0x87, 0xaf, 0xd7, 0xff},
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{0x87, 0xaf, 0xff, 0xff},
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{0x87, 0xd7, 0x00, 0xff},
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{0x87, 0xd7, 0x5f, 0xff},
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{0x87, 0xd7, 0x87, 0xff},
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{0x87, 0xd7, 0xaf, 0xff},
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{0x87, 0xd7, 0xd7, 0xff},
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{0x87, 0xd7, 0xff, 0xff},
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{0x87, 0xff, 0x00, 0xff},
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{0x87, 0xff, 0x5f, 0xff},
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{0x87, 0xff, 0x87, 0xff},
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{0x87, 0xff, 0xaf, 0xff},
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{0x87, 0xff, 0xd7, 0xff},
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{0x87, 0xff, 0xff, 0xff},
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{0xaf, 0x00, 0x00, 0xff},
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{0xaf, 0x00, 0x5f, 0xff},
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{0xaf, 0x00, 0x87, 0xff},
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{0xaf, 0x00, 0xaf, 0xff},
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{0xaf, 0x00, 0xd7, 0xff},
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{0xaf, 0x00, 0xff, 0xff},
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{0xaf, 0x5f, 0x00, 0xff},
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{0xaf, 0x5f, 0x5f, 0xff},
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{0xaf, 0x5f, 0x87, 0xff},
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{0xaf, 0x5f, 0xaf, 0xff},
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{0xaf, 0x5f, 0xd7, 0xff},
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{0xaf, 0x5f, 0xff, 0xff},
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{0xaf, 0x87, 0x00, 0xff},
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{0xaf, 0x87, 0x5f, 0xff},
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{0xaf, 0x87, 0x87, 0xff},
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{0xaf, 0x87, 0xaf, 0xff},
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{0xaf, 0x87, 0xd7, 0xff},
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{0xaf, 0x87, 0xff, 0xff},
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{0xaf, 0xaf, 0x00, 0xff},
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{0xaf, 0xaf, 0x5f, 0xff},
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{0xaf, 0xaf, 0x87, 0xff},
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{0xaf, 0xaf, 0xaf, 0xff},
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{0xaf, 0xaf, 0xd7, 0xff},
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{0xaf, 0xaf, 0xff, 0xff},
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{0xaf, 0xd7, 0x00, 0xff},
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{0xaf, 0xd7, 0x5f, 0xff},
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{0xaf, 0xd7, 0x87, 0xff},
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{0xaf, 0xd7, 0xaf, 0xff},
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{0xaf, 0xd7, 0xd7, 0xff},
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{0xaf, 0xd7, 0xff, 0xff},
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{0xaf, 0xff, 0x00, 0xff},
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{0xaf, 0xff, 0x5f, 0xff},
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{0xaf, 0xff, 0x87, 0xff},
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{0xaf, 0xff, 0xaf, 0xff},
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{0xaf, 0xff, 0xd7, 0xff},
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{0xaf, 0xff, 0xff, 0xff},
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{0xd7, 0x00, 0x00, 0xff},
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{0xd7, 0x00, 0x5f, 0xff},
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{0xd7, 0x00, 0x87, 0xff},
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{0xd7, 0x00, 0xaf, 0xff},
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{0xd7, 0x00, 0xd7, 0xff},
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{0xd7, 0x00, 0xff, 0xff},
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{0xd7, 0x5f, 0x00, 0xff},
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{0xd7, 0x5f, 0x5f, 0xff},
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{0xd7, 0x5f, 0x87, 0xff},
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{0xd7, 0x5f, 0xaf, 0xff},
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{0xd7, 0x5f, 0xd7, 0xff},
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{0xd7, 0x5f, 0xff, 0xff},
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{0xd7, 0x87, 0x00, 0xff},
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{0xd7, 0x87, 0x5f, 0xff},
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{0xd7, 0x87, 0x87, 0xff},
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{0xd7, 0x87, 0xaf, 0xff},
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{0xd7, 0x87, 0xd7, 0xff},
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{0xd7, 0x87, 0xff, 0xff},
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{0xd7, 0xaf, 0x00, 0xff},
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{0xd7, 0xaf, 0x5f, 0xff},
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{0xd7, 0xaf, 0x87, 0xff},
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{0xd7, 0xaf, 0xaf, 0xff},
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{0xd7, 0xaf, 0xd7, 0xff},
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{0xd7, 0xaf, 0xff, 0xff},
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{0xd7, 0xd7, 0x00, 0xff},
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{0xd7, 0xd7, 0x5f, 0xff},
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{0xd7, 0xd7, 0x87, 0xff},
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{0xd7, 0xd7, 0xaf, 0xff},
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{0xd7, 0xd7, 0xd7, 0xff},
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{0xd7, 0xd7, 0xff, 0xff},
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{0xd7, 0xff, 0x00, 0xff},
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{0xd7, 0xff, 0x5f, 0xff},
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{0xd7, 0xff, 0x87, 0xff},
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{0xd7, 0xff, 0xaf, 0xff},
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{0xd7, 0xff, 0xd7, 0xff},
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{0xd7, 0xff, 0xff, 0xff},
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{0xff, 0x00, 0x00, 0xff},
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{0xff, 0x00, 0x5f, 0xff},
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{0xff, 0x00, 0x87, 0xff},
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{0xff, 0x00, 0xaf, 0xff},
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{0xff, 0x00, 0xd7, 0xff},
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{0xff, 0x00, 0xff, 0xff},
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{0xff, 0x5f, 0x00, 0xff},
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{0xff, 0x5f, 0x5f, 0xff},
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{0xff, 0x5f, 0x87, 0xff},
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{0xff, 0x5f, 0xaf, 0xff},
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{0xff, 0x5f, 0xd7, 0xff},
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{0xff, 0x5f, 0xff, 0xff},
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{0xff, 0x87, 0x00, 0xff},
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{0xff, 0x87, 0x5f, 0xff},
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{0xff, 0x87, 0x87, 0xff},
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{0xff, 0x87, 0xaf, 0xff},
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{0xff, 0x87, 0xd7, 0xff},
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{0xff, 0x87, 0xff, 0xff},
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{0xff, 0xaf, 0x00, 0xff},
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{0xff, 0xaf, 0x5f, 0xff},
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{0xff, 0xaf, 0x87, 0xff},
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{0xff, 0xaf, 0xaf, 0xff},
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{0xff, 0xaf, 0xd7, 0xff},
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{0xff, 0xaf, 0xff, 0xff},
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{0xff, 0xd7, 0x00, 0xff},
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{0xff, 0xd7, 0x5f, 0xff},
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{0xff, 0xd7, 0x87, 0xff},
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{0xff, 0xd7, 0xaf, 0xff},
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{0xff, 0xd7, 0xd7, 0xff},
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{0xff, 0xd7, 0xff, 0xff},
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{0xff, 0xff, 0x00, 0xff},
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{0xff, 0xff, 0x5f, 0xff},
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{0xff, 0xff, 0x87, 0xff},
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{0xff, 0xff, 0xaf, 0xff},
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{0xff, 0xff, 0xd7, 0xff},
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{0xff, 0xff, 0xff, 0xff},
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/* 24-Grayscale slide */
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{0x00, 0x00, 0x00, 0xff},
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{0x12, 0x12, 0x12, 0xff},
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{0x1c, 0x1c, 0x1c, 0xff},
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{0x26, 0x26, 0x26, 0xff},
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{0x30, 0x30, 0x30, 0xff},
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{0x3a, 0x3a, 0x3a, 0xff},
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{0x44, 0x44, 0x44, 0xff},
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{0x4e, 0x4e, 0x4e, 0xff},
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{0x58, 0x58, 0x58, 0xff},
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{0x62, 0x62, 0x62, 0xff},
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{0x6c, 0x6c, 0x6c, 0xff},
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{0x76, 0x76, 0x76, 0xff},
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{0x80, 0x80, 0x80, 0xff},
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{0x8a, 0x8a, 0x8a, 0xff},
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{0x94, 0x94, 0x94, 0xff},
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{0x9e, 0x9e, 0x9e, 0xff},
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{0xa8, 0xa8, 0xa8, 0xff},
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{0xb2, 0xb2, 0xb2, 0xff},
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{0xbc, 0xbc, 0xbc, 0xff},
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{0xc6, 0xc6, 0xc6, 0xff},
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{0xd0, 0xd0, 0xd0, 0xff},
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{0xda, 0xda, 0xda, 0xff},
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{0xe4, 0xe4, 0xe4, 0xff},
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{0xee, 0xee, 0xee, 0xff}
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};
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