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// * This file is part of the COLOBOT source code
// * Copyright (C) 2012, Polish Portal of Colobot (PPC)
// *
// * 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/.
// color.cpp
#include "graphics/common/color.h"
// TODO
// Returns the color corresponding D3DCOLOR.
D3DCOLOR RetColor(float intensity)
{
D3DCOLOR color;
if ( intensity <= 0.0f ) return 0x00000000;
if ( intensity >= 1.0f ) return 0xffffffff;
color = (int)(intensity*255.0f)<<24;
color |= (int)(intensity*255.0f)<<16;
color |= (int)(intensity*255.0f)<<8;
color |= (int)(intensity*255.0f);
return color;
}
// Returns the color corresponding D3DCOLOR.
D3DCOLOR RetColor(D3DCOLORVALUE intensity)
{
D3DCOLOR color;
color = (int)(intensity.a*255.0f)<<24;
color |= (int)(intensity.r*255.0f)<<16;
color |= (int)(intensity.g*255.0f)<<8;
color |= (int)(intensity.b*255.0f);
return color;
}
// Returns the color corresponding D3DCOLORVALUE.
D3DCOLORVALUE RetColor(D3DCOLOR intensity)
{
D3DCOLORVALUE color;
color.r = (float)((intensity>>16)&0xff)/256.0f;
color.g = (float)((intensity>>8 )&0xff)/256.0f;
color.b = (float)((intensity>>0 )&0xff)/256.0f;
color.a = (float)((intensity>>24)&0xff)/256.0f;
return color;
}
// RGB to HSV conversion.
void RGB2HSV(D3DCOLORVALUE src, ColorHSV &dest)
{
float min, max, delta;
min = Min(src.r, src.g, src.b);
max = Max(src.r, src.g, src.b);
dest.v = max; // intensity
if ( max == 0.0f )
{
dest.s = 0.0f; // saturation
dest.h = 0.0f; // undefined color!
}
else
{
delta = max-min;
dest.s = delta/max; // saturation
if ( src.r == max ) // between yellow & magenta
{
dest.h = (src.g-src.b)/delta;
}
else if ( src.g == max ) // between cyan & yellow
{
dest.h = 2.0f+(src.b-src.r)/delta;
}
else // between magenta & cyan
{
dest.h = 4.0f+(src.r-src.g)/delta;
}
dest.h *= 60.0f; // in degrees
if ( dest.h < 0.0f ) dest.h += 360.0f;
dest.h /= 360.0f; // 0..1
}
}
// HSV to RGB conversion.
void HSV2RGB(ColorHSV src, D3DCOLORVALUE &dest)
{
int i;
float f,v,p,q,t;
src.h = Norm(src.h)*360.0f;
src.s = Norm(src.s);
src.v = Norm(src.v);
if ( src.s == 0.0f ) // zero saturation?
{
dest.r = src.v;
dest.g = src.v;
dest.b = src.v; // gray
}
else
{
if ( src.h == 360.0f ) src.h = 0.0f;
src.h /= 60.0f;
i = (int)src.h; // integer part (0 .. 5)
f = src.h-i; // fractional part
v = src.v;
p = src.v*(1.0f-src.s);
q = src.v*(1.0f-(src.s*f));
t = src.v*(1.0f-(src.s*(1.0f-f)));
switch (i)
{
case 0: dest.r=v; dest.g=t; dest.b=p; break;
case 1: dest.r=q; dest.g=v; dest.b=p; break;
case 2: dest.r=p; dest.g=v; dest.b=t; break;
case 3: dest.r=p; dest.g=q; dest.b=v; break;
case 4: dest.r=t; dest.g=p; dest.b=v; break;
case 5: dest.r=v; dest.g=p; dest.b=q; break;
}
}
}
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