Diff: ColorConversion.cpp

Revision:

0:02f4f92c778a

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ColorConversion.cpp	Sun Jun 19 00:10:54 2016 +0000
@@ -0,0 +1,48 @@
+#include "ColorConversion.h"
+
+
+/*
+this function converts all len pixels from HSV colorspace to RGB colorspace. Value is constant and assumed to be the same for all pixels 
+in hsBuf [HSHSHS...] All HSV values are integers, multiplied by a constant factor of 1000, so that integer math works (in case there's no
+FPU).
+*/
+void convertHSVtoRGB(const int* hsBuf, uint8_t* rgbBuf,size_t len,int CVALUE){
+    for(size_t i=0;i<len;i++){
+        int hue = hsBuf[2*i];
+        hue = hue%360000;
+        int saturation = hsBuf[2*i+1];
+        int c = CVALUE*saturation/1000;
+        //float unused;
+        int x = c * (1000-abs((hue/60)%2000-1000))/1000;
+        int m = CVALUE-c;
+        int rprime,gprime,bprime;
+        if (0 <= hue && hue < 60000){
+            rprime=c;
+            gprime=x;
+            bprime=0;
+        }else if(60000 <= hue && hue < 120000){
+            rprime=x;
+            gprime=c;
+            bprime=0;
+        }else if(120000 <= hue && hue < 180000){
+            rprime=0.0f;
+            gprime=c;
+            bprime=x;
+        }else if(180000 <= hue && hue < 240000){
+            rprime=0;
+            gprime=x;
+            bprime=c;
+        }else if(240000 <= hue && hue < 300000){
+            rprime=x;
+            gprime=0;
+            bprime=c;
+        }else{// if(300f <= hue && hue < 360f){
+            rprime=c;
+            gprime=0;
+            bprime=x;
+        }
+        rgbBuf[3*i]=uint8_t((rprime+m)*255/1000);
+        rgbBuf[3*i+1]=uint8_t((gprime+m)*255/1000);
+        rgbBuf[3*i+2]=uint8_t((bprime+m)*255/1000);
+    }
+}
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