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89 lines
1.8 KiB
89 lines
1.8 KiB
#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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#ifdef HSL_LINEAR
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const uint8_t FADE_128[] = {
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0, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 3, 3, 3, 4, 4, 4, 4,
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5, 5, 6, 6, 6, 7, 7, 8, 8, 8, 9, 10, 10, 10, 11, 12, 13, 14,
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14, 15, 16, 17, 18, 20, 21, 22, 24, 26, 27, 28, 30, 31, 32, 34, 35, 36,
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38, 39, 40, 41, 42, 44, 45, 46, 48, 49, 50, 52, 54, 56, 58, 59, 61, 63,
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65, 67, 68, 69, 71, 72, 74, 76, 78, 80, 82, 85, 88, 90, 92, 95, 98, 100,
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103, 106, 109, 112, 116, 119, 122, 125, 129, 134, 138, 142, 147, 151,
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153, 156, 160, 163, 165, 170, 175, 180, 185, 190, 195, 200, 207, 214, 218,
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221, 225, 228, 232, 234, 241, 248, 254, 255
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};
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#endif
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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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