90 lines
2.2 KiB
C
90 lines
2.2 KiB
C
/* Copyright 2017 Jason Williams
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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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* 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 "led_tables.h"
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#include "progmem.h"
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RGB hsv_to_rgb(HSV hsv) {
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RGB rgb;
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uint8_t region, remainder, p, q, t;
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uint16_t h, s, v;
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if (hsv.s == 0) {
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#ifdef USE_CIE1931_CURVE
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rgb.r = rgb.g = rgb.b = pgm_read_byte(&CIE1931_CURVE[hsv.v]);
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#else
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rgb.r = hsv.v;
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rgb.g = hsv.v;
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rgb.b = hsv.v;
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#endif
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return rgb;
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}
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h = hsv.h;
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s = hsv.s;
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v = hsv.v;
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region = h * 6 / 255;
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remainder = (h * 2 - region * 85) * 3;
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p = (v * (255 - s)) >> 8;
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q = (v * (255 - ((s * remainder) >> 8))) >> 8;
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t = (v * (255 - ((s * (255 - remainder)) >> 8))) >> 8;
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switch (region) {
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case 6:
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case 0:
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rgb.r = v;
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rgb.g = t;
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rgb.b = p;
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break;
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case 1:
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rgb.r = q;
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rgb.g = v;
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rgb.b = p;
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break;
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case 2:
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rgb.r = p;
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rgb.g = v;
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rgb.b = t;
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break;
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case 3:
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rgb.r = p;
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rgb.g = q;
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rgb.b = v;
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break;
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case 4:
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rgb.r = t;
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rgb.g = p;
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rgb.b = v;
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break;
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default:
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rgb.r = v;
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rgb.g = p;
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rgb.b = q;
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break;
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}
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#ifdef USE_CIE1931_CURVE
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rgb.r = pgm_read_byte(&CIE1931_CURVE[rgb.r]);
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rgb.g = pgm_read_byte(&CIE1931_CURVE[rgb.g]);
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rgb.b = pgm_read_byte(&CIE1931_CURVE[rgb.b]);
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#endif
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return rgb;
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}
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