- /* 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"
- #include "util.h"
-
- RGB hsv_to_rgb_impl(HSV hsv, bool use_cie) {
- RGB rgb;
- uint8_t region, remainder, p, q, t;
- uint16_t h, s, v;
-
- if (hsv.s == 0) {
- #ifdef USE_CIE1931_CURVE
- if (use_cie) {
- rgb.r = rgb.g = rgb.b = pgm_read_byte(&CIE1931_CURVE[hsv.v]);
- } else {
- rgb.r = hsv.v;
- rgb.g = hsv.v;
- rgb.b = hsv.v;
- }
- #else
- rgb.r = hsv.v;
- rgb.g = hsv.v;
- rgb.b = hsv.v;
- #endif
- return rgb;
- }
-
- h = hsv.h;
- s = hsv.s;
- #ifdef USE_CIE1931_CURVE
- if (use_cie) {
- v = pgm_read_byte(&CIE1931_CURVE[hsv.v]);
- } else {
- v = hsv.v;
- }
- #else
- v = hsv.v;
- #endif
-
- region = h * 6 / 255;
- remainder = (h * 2 - region * 85) * 3;
-
- p = (v * (255 - s)) >> 8;
- q = (v * (255 - ((s * remainder) >> 8))) >> 8;
- t = (v * (255 - ((s * (255 - remainder)) >> 8))) >> 8;
-
- switch (region) {
- case 6:
- 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;
- }
-
- return rgb;
- }
-
- RGB hsv_to_rgb(HSV hsv) {
- #ifdef USE_CIE1931_CURVE
- return hsv_to_rgb_impl(hsv, true);
- #else
- return hsv_to_rgb_impl(hsv, false);
- #endif
- }
-
- RGB hsv_to_rgb_nocie(HSV hsv) {
- return hsv_to_rgb_impl(hsv, false);
- }
-
- #ifdef RGBW
- void convert_rgb_to_rgbw(rgb_led_t *led) {
- // Determine lowest value in all three colors, put that into
- // the white channel and then shift all colors by that amount
- led->w = MIN(led->r, MIN(led->g, led->b));
- led->r -= led->w;
- led->g -= led->w;
- led->b -= led->w;
- }
- #endif
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