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Dependencies:   EthernetInterfacePlusHostname RdWebServer mbed-rtos mbed

colourconverters.cpp@5:910909f34907, 2015-09-01 (annotated)

Committer:
Bobty
Date:
Tue Sep 01 15:53:52 2015 +0000
Revision:
5:910909f34907
Parent:
0:887096209439
Child:
6:8df79fe1afcd
Added an idle handler so there is something to show when nothing is being sent over HTTP

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Bobty 0:887096209439 1 #include "colourconverters.h"
Bobty 0:887096209439 2
Bobty 0:887096209439 3 RgbColor HsvToRgb(HsvColor hsv)
Bobty 0:887096209439 4 {
Bobty 0:887096209439 5 RgbColor rgb(0,0,0);
Bobty 0:887096209439 6 unsigned char region, remainder, p, q, t;
Bobty 0:887096209439 7
Bobty 0:887096209439 8 if (hsv.s == 0)
Bobty 0:887096209439 9 {
Bobty 0:887096209439 10 rgb.r = hsv.v;
Bobty 0:887096209439 11 rgb.g = hsv.v;
Bobty 0:887096209439 12 rgb.b = hsv.v;
Bobty 0:887096209439 13 return rgb;
Bobty 0:887096209439 14 }
Bobty 0:887096209439 15
Bobty 0:887096209439 16 region = hsv.h / 43;
Bobty 0:887096209439 17 remainder = (hsv.h - (region * 43)) * 6;
Bobty 0:887096209439 18
Bobty 0:887096209439 19 p = (hsv.v * (255 - hsv.s)) >> 8;
Bobty 0:887096209439 20 q = (hsv.v * (255 - ((hsv.s * remainder) >> 8))) >> 8;
Bobty 0:887096209439 21 t = (hsv.v * (255 - ((hsv.s * (255 - remainder)) >> 8))) >> 8;
Bobty 0:887096209439 22
Bobty 0:887096209439 23 switch (region)
Bobty 0:887096209439 24 {
Bobty 0:887096209439 25 case 0:
Bobty 0:887096209439 26 rgb.r = hsv.v; rgb.g = t; rgb.b = p;
Bobty 0:887096209439 27 break;
Bobty 0:887096209439 28 case 1:
Bobty 0:887096209439 29 rgb.r = q; rgb.g = hsv.v; rgb.b = p;
Bobty 0:887096209439 30 break;
Bobty 0:887096209439 31 case 2:
Bobty 0:887096209439 32 rgb.r = p; rgb.g = hsv.v; rgb.b = t;
Bobty 0:887096209439 33 break;
Bobty 0:887096209439 34 case 3:
Bobty 0:887096209439 35 rgb.r = p; rgb.g = q; rgb.b = hsv.v;
Bobty 0:887096209439 36 break;
Bobty 0:887096209439 37 case 4:
Bobty 0:887096209439 38 rgb.r = t; rgb.g = p; rgb.b = hsv.v;
Bobty 0:887096209439 39 break;
Bobty 0:887096209439 40 default:
Bobty 0:887096209439 41 rgb.r = hsv.v; rgb.g = p; rgb.b = q;
Bobty 0:887096209439 42 break;
Bobty 0:887096209439 43 }
Bobty 0:887096209439 44
Bobty 0:887096209439 45 return rgb;
Bobty 0:887096209439 46 }
Bobty 0:887096209439 47
Bobty 0:887096209439 48 HsvColor RgbToHsv(RgbColor rgb)
Bobty 0:887096209439 49 {
Bobty 0:887096209439 50 HsvColor hsv(0,0,0);
Bobty 0:887096209439 51 unsigned char rgbMin, rgbMax;
Bobty 0:887096209439 52
Bobty 0:887096209439 53 rgbMin = rgb.r < rgb.g ? (rgb.r < rgb.b ? rgb.r : rgb.b) : (rgb.g < rgb.b ? rgb.g : rgb.b);
Bobty 0:887096209439 54 rgbMax = rgb.r > rgb.g ? (rgb.r > rgb.b ? rgb.r : rgb.b) : (rgb.g > rgb.b ? rgb.g : rgb.b);
Bobty 0:887096209439 55
Bobty 0:887096209439 56 hsv.v = rgbMax;
Bobty 0:887096209439 57 if (hsv.v == 0)
Bobty 0:887096209439 58 {
Bobty 0:887096209439 59 hsv.h = 0;
Bobty 0:887096209439 60 hsv.s = 0;
Bobty 0:887096209439 61 return hsv;
Bobty 0:887096209439 62 }
Bobty 0:887096209439 63
Bobty 0:887096209439 64 hsv.s = 255 * long(rgbMax - rgbMin) / hsv.v;
Bobty 0:887096209439 65 if (hsv.s == 0)
Bobty 0:887096209439 66 {
Bobty 0:887096209439 67 hsv.h = 0;
Bobty 0:887096209439 68 return hsv;
Bobty 0:887096209439 69 }
Bobty 0:887096209439 70
Bobty 0:887096209439 71 if (rgbMax == rgb.r)
Bobty 0:887096209439 72 hsv.h = 0 + 43 * (rgb.g - rgb.b) / (rgbMax - rgbMin);
Bobty 0:887096209439 73 else if (rgbMax == rgb.g)
Bobty 0:887096209439 74 hsv.h = 85 + 43 * (rgb.b - rgb.r) / (rgbMax - rgbMin);
Bobty 0:887096209439 75 else
Bobty 0:887096209439 76 hsv.h = 171 + 43 * (rgb.r - rgb.g) / (rgbMax - rgbMin);
Bobty 0:887096209439 77
Bobty 0:887096209439 78 return hsv;
Bobty 0:887096209439 79 }