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git://projects.qi-hardware.com/ben-blinkenlights.git
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6558f56de6
- ubb-vga.h (ccube_init, ccube_map), ccube.c: color mapper based on proximity in color cube - grabfb.c (pattern, grabfb), ppmimg.c (pattern, convert): use the color cube mapper instead of inferios threshold-based mapping - ubb-vga2.c (session): initialize the color cube - ubb-vga.h (thres), grabfb.c (thres), ubb-vga2.c (usage, main): removed the threshold along with the option (-l) to set it - Makefile (OBJS): added ccube.o
59 lines
1.1 KiB
C
59 lines
1.1 KiB
C
/*
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* ccube.c - Color mapper based on color cube model
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*
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* Written 2011 by Werner Almesberger
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* Copyright 2011 Werner Almesberger
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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 2 of the License, or
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* (at your option) any later version.
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*/
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#include <stdint.h>
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#include "ubb-vga.h"
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#define W_RGB (256*0.5)
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#define W_Y (256*0.25)
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#define W_0 (256*0.125)
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static struct col {
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uint8_t r, g, b;
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} col[16];
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uint8_t ccube_map(uint8_t r, uint8_t g, uint8_t b)
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{
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unsigned best = 0;
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int best_i = 0;
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unsigned d;
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int i;
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for (i = 0; i != 16; i++) {
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d = (r-col[i].r)*(r-col[i].r)+
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(g-col[i].g)*(g-col[i].g)+
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(b-col[i].b)*(b-col[i].b);
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if (!i || d < best) {
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best = d;
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best_i = i;
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}
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}
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return best_i;
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}
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void ccube_init(void)
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{
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int i;
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for (i = 0; i != 16; i++) {
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col[i].r = W_0+(i & R_VAL ? W_RGB : 0)+(i & Y_VAL ? W_Y : 0);
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col[i].g = W_0+(i & G_VAL ? W_RGB : 0)+(i & Y_VAL ? W_Y : 0);
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col[i].b = W_0+(i & B_VAL ? W_RGB : 0)+(i & Y_VAL ? W_Y : 0);
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}
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}
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