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- /* Copyright 2017 Jason Williams
- *
- * 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 2 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 "color.h"
- #include "led_tables.h"
- #include "progmem.h"
-
- RGB hsv_to_rgb( HSV hsv )
- {
- RGB rgb;
- uint8_t region, p, q, t;
- uint16_t h, s, v, remainder;
-
- if ( hsv.s == 0 )
- {
- rgb.r = hsv.v;
- rgb.g = hsv.v;
- rgb.b = hsv.v;
- return rgb;
- }
-
- h = hsv.h;
- s = hsv.s;
- v = hsv.v;
-
- region = h / 43;
- remainder = (h - (region * 43)) * 6;
-
- p = (v * (255 - s)) >> 8;
- q = (v * (255 - ((s * remainder) >> 8))) >> 8;
- t = (v * (255 - ((s * (255 - remainder)) >> 8))) >> 8;
-
- switch ( region )
- {
- case 0:
- rgb.r = v;
- rgb.g = t;
- rgb.b = p;
- break;
- case 1:
- rgb.r = q;
- rgb.g = v;
- rgb.b = p;
- break;
- case 2:
- rgb.r = p;
- rgb.g = v;
- rgb.b = t;
- break;
- case 3:
- rgb.r = p;
- rgb.g = q;
- rgb.b = v;
- break;
- case 4:
- rgb.r = t;
- rgb.g = p;
- rgb.b = v;
- break;
- default:
- rgb.r = v;
- rgb.g = p;
- rgb.b = q;
- break;
- }
-
- rgb.r = pgm_read_byte( &CIE1931_CURVE[rgb.r] );
- rgb.g = pgm_read_byte( &CIE1931_CURVE[rgb.g] );
- rgb.b = pgm_read_byte( &CIE1931_CURVE[rgb.b] );
-
- return rgb;
- }
-
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