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https://github.com/eddyem/stm32samples.git
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65 lines
1.9 KiB
C
65 lines
1.9 KiB
C
/*
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* This file is part of the ws2815 project.
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* Copyright 2021 Edward V. Emelianov <edward.emelianoff@gmail.com>.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "hsv.h"
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/**
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* @brief hsv2grb - convert HSV to 24bit GRB
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* @param h (0..359) - Hue in degrees
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* @param s (0..100) - Saturation (color depth)
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* @param v (0..100) - Value (intensity)
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* @return 24-bit color
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*/
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uint32_t hsv2grb(uint16_t h, uint8_t s, uint8_t v){
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if(h > 359) h %= 360;
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if(s > 100) s %= 101;
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if(v > 100) v %= 101;
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int Hi = (h/60) % 6;
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int Vmin = (100 - s) * v;
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Vmin /= 100;
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int a = (v - Vmin) * (h % 60);
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a /= 60;
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int Vinc = Vmin + a;
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int Vdec = v - a;
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int r, g, b;
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switch(Hi){
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case 1:
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r = Vdec; g = v; b = Vmin;
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break;
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case 2:
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r = Vmin; g = v; b = Vinc;
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break;
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case 3:
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r = Vmin; g = Vdec; b = v;
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break;
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case 4:
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r = Vinc; g = Vmin; b = v;
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break;
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case 5:
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r = v; g = Vmin; b = Vdec;
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break;
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default:
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r = v; g = Vinc; b = Vmin;
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}
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// now convert r/g/b from percents to 0..255
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r = (r*255)/100;
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g = (g*255)/100;
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b = (b*255)/100;
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return ((b<<16) | (r<<8) | g); // little endian!!!
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}
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