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/*
** Haaf's Game Engine 1.7
** Copyright (C) 2003-2007, Relish Games
** hge.relishgames.com
**
** hgeColor*** helper classes implementation
*/
#include "hgecolor.h"
#include <math.h>
#ifndef min
#define min(x,y) ((x) < (y) ? (x) : (y))
#endif
#ifndef max
#define max(x,y) ((x) > (y) ? (x) : (y))
#endif
void hgeColorHSV::SetHWColor(DWORD col)
{
float r, g, b;
float minv, maxv, delta;
float del_R, del_G, del_B;
a = (col>>24) / 255.0f;
r = ((col>>16) & 0xFF) / 255.0f;
g = ((col>>8) & 0xFF) / 255.0f;
b = (col & 0xFF) / 255.0f;
minv = min(min(r, g), b);
maxv = max(max(r, g), b);
delta = maxv - minv;
v = maxv;
if (delta == 0)
{
h = 0;
s = 0;
}
else
{
s = delta / maxv;
del_R = (((maxv - r) / 6) + (delta / 2)) / delta;
del_G = (((maxv - g) / 6) + (delta / 2)) / delta;
del_B = (((maxv - b) / 6) + (delta / 2)) / delta;
if (r == maxv) {h = del_B - del_G;}
else if (g == maxv) {h = (1.0f / 3.0f) + del_R - del_B;}
else if (b == maxv) {h = (2.0f / 3.0f) + del_G - del_R;}
if (h < 0) h += 1;
if (h > 1) h -= 1;
}
}
DWORD hgeColorHSV::GetHWColor() const
{
float r, g, b;
float xh, i, p1, p2, p3;
if (s == 0)
{
r = v;
g = v;
b = v;
}
else
{
xh = h * 6;
if(xh == 6) xh=0;
i = floorf(xh);
p1 = v * (1 - s);
p2 = v * (1 - s * (xh - i));
p3 = v * (1 - s * (1 - (xh - i)));
if (i == 0) {r = v; g = p3; b = p1;}
else if (i == 1) {r = p2; g = v; b = p1;}
else if (i == 2) {r = p1; g = v; b = p3;}
else if (i == 3) {r = p1; g = p2; b = v; }
else if (i == 4) {r = p3; g = p1; b = v; }
else {r = v; g = p1; b = p2;}
}
return (DWORD(a*255.0f)<<24) + (DWORD(r*255.0f)<<16) + (DWORD(g*255.0f)<<8) + DWORD(b*255.0f);
}
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