Diff: colourconverters.cpp

Revision:

0:887096209439

Child:

6:8df79fe1afcd

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/colourconverters.cpp	Tue Aug 18 16:03:29 2015 +0000
@@ -0,0 +1,79 @@
+#include "colourconverters.h"
+
+RgbColor HsvToRgb(HsvColor hsv)
+{
+    RgbColor rgb(0,0,0);
+    unsigned char region, remainder, p, q, t;
+
+    if (hsv.s == 0)
+    {
+        rgb.r = hsv.v;
+        rgb.g = hsv.v;
+        rgb.b = hsv.v;
+        return rgb;
+    }
+
+    region = hsv.h / 43;
+    remainder = (hsv.h - (region * 43)) * 6; 
+
+    p = (hsv.v * (255 - hsv.s)) >> 8;
+    q = (hsv.v * (255 - ((hsv.s * remainder) >> 8))) >> 8;
+    t = (hsv.v * (255 - ((hsv.s * (255 - remainder)) >> 8))) >> 8;
+
+    switch (region)
+    {
+        case 0:
+            rgb.r = hsv.v; rgb.g = t; rgb.b = p;
+            break;
+        case 1:
+            rgb.r = q; rgb.g = hsv.v; rgb.b = p;
+            break;
+        case 2:
+            rgb.r = p; rgb.g = hsv.v; rgb.b = t;
+            break;
+        case 3:
+            rgb.r = p; rgb.g = q; rgb.b = hsv.v;
+            break;
+        case 4:
+            rgb.r = t; rgb.g = p; rgb.b = hsv.v;
+            break;
+        default:
+            rgb.r = hsv.v; rgb.g = p; rgb.b = q;
+            break;
+    }
+
+    return rgb;
+}
+
+HsvColor RgbToHsv(RgbColor rgb)
+{
+    HsvColor hsv(0,0,0);
+    unsigned char rgbMin, rgbMax;
+
+    rgbMin = rgb.r < rgb.g ? (rgb.r < rgb.b ? rgb.r : rgb.b) : (rgb.g < rgb.b ? rgb.g : rgb.b);
+    rgbMax = rgb.r > rgb.g ? (rgb.r > rgb.b ? rgb.r : rgb.b) : (rgb.g > rgb.b ? rgb.g : rgb.b);
+
+    hsv.v = rgbMax;
+    if (hsv.v == 0)
+    {
+        hsv.h = 0;
+        hsv.s = 0;
+        return hsv;
+    }
+
+    hsv.s = 255 * long(rgbMax - rgbMin) / hsv.v;
+    if (hsv.s == 0)
+    {
+        hsv.h = 0;
+        return hsv;
+    }
+
+    if (rgbMax == rgb.r)
+        hsv.h = 0 + 43 * (rgb.g - rgb.b) / (rgbMax - rgbMin);
+    else if (rgbMax == rgb.g)
+        hsv.h = 85 + 43 * (rgb.b - rgb.r) / (rgbMax - rgbMin);
+    else
+        hsv.h = 171 + 43 * (rgb.r - rgb.g) / (rgbMax - rgbMin);
+
+    return hsv;
+}