/* 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, remainder, p, q, t; uint16_t h, s, v; if (hsv.s == 0) { #ifdef USE_CIE1931_CURVE 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; #endif return rgb; } h = hsv.h; s = hsv.s; #ifdef USE_CIE1931_CURVE v = pgm_read_byte(&CIE1931_CURVE[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; } #ifdef RGBW # ifndef MIN # define MIN(a, b) ((a) < (b) ? (a) : (b)) # endif void convert_rgb_to_rgbw(LED_TYPE *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