restructuring

F1:F103/ws2815/hsv.c

@@ -0,0 +1,64 @@
+/*
+ * This file is part of the ws2815 project.
+ * Copyright 2021 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * 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 3 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 "hsv.h"
+
+/**
+ * @brief hsv2grb - convert HSV to 24bit GRB
+ * @param h (0..359) - Hue in degrees
+ * @param s (0..100) - Saturation (color depth)
+ * @param v (0..100) - Value (intensity)
+ * @return 24-bit  color
+ */
+uint32_t hsv2grb(uint16_t h, uint8_t s, uint8_t v){
+    if(h > 359) h %= 360;
+    if(s > 100) s %= 101;
+    if(v > 100) v %= 101;
+    int Hi = (h/60) % 6;
+    int Vmin = (100 - s) * v;
+    Vmin /= 100;
+    int a = (v - Vmin) * (h % 60);
+    a /= 60;
+    int Vinc = Vmin + a;
+    int Vdec = v - a;
+    int r, g, b;
+    switch(Hi){
+        case 1:
+            r = Vdec; g = v; b = Vmin;
+        break;
+        case 2:
+            r = Vmin; g = v; b = Vinc;
+        break;
+        case 3:
+            r = Vmin; g = Vdec; b = v;
+        break;
+        case 4:
+            r = Vinc; g = Vmin; b = v;
+        break;
+        case 5:
+            r = v; g = Vmin; b = Vdec;
+        break;
+        default:
+            r = v; g = Vinc; b = Vmin;
+    }
+    // now convert r/g/b from percents to 0..255
+    r = (r*255)/100;
+    g = (g*255)/100;
+    b = (b*255)/100;
+    return ((b<<16) | (r<<8) | g); // little endian!!!
+}