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77 lines
1.2 KiB
77 lines
1.2 KiB
10 years ago
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#include <stdlib.h>
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#include <stdint.h>
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#include "colors.h"
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#include "hsl.h"
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// based on: https://github.com/lewisd32/avr-hsl2rgb
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xrgb_t hsl2xrgb(const hsl_t cc)
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{
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// 0 .. 256*3
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const uint16_t hh = (uint16_t) cc.h * 3;
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const uint8_t hue_mod = hh % 256;
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uint8_t r_temp, g_temp, b_temp;
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if (hh < 256) {
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r_temp = hue_mod ^ 255;
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g_temp = hue_mod;
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b_temp = 0;
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} else if (hh < 512) {
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r_temp = 0;
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g_temp = hue_mod ^ 255;
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b_temp = hue_mod;
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} else if (hh < 768) {
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r_temp = hue_mod;
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g_temp = 0;
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b_temp = hue_mod ^ 255;
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} else {
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r_temp = 0;
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g_temp = 0;
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b_temp = 0;
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}
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const uint8_t inverse_sat = (cc.s ^ 255);
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xrgb_t rgb;
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uint8_t t8;
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uint16_t t16;
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#ifdef HSL_LINEAR
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const uint8_t bri = FADE_128[cc.l>>1];
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#else
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const uint8_t bri = cc.l;
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#endif
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t8 = r_temp;
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t16 = t8 * cc.s + t8;
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t16 = t16 + t8;
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t8 = t16 >> 8;
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t8 = t8 + inverse_sat;
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t16 = t8 * bri;
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t16 = t16 + t8;
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t8 = t16 >> 8;
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rgb.r = t8;
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t8 = g_temp;
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t16 = t8 * cc.s;
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t16 = t16 + t8;
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t8 = t16 >> 8;
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t8 = t8 + inverse_sat;
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t16 = t8 * bri;
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t16 = t16 + t8;
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t8 = t16 >> 8;
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rgb.g = t8;
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t8 = b_temp;
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t16 = t8 * cc.s;
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t16 = t16 + t8;
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t8 = t16 >> 8;
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t8 = t8 + inverse_sat;
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t16 = t8 * bri;
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t16 = t16 + t8;
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t8 = t16 >> 8;
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rgb.b = t8;
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return rgb;
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}
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