mirror of
https://github.com/amyinspace/MagicSetEditor2.git
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twanvl
0a916f89bc
git-svn-id: svn://svn.code.sf.net/p/magicseteditor/code/trunk@92 0fc631ac-6414-0410-93d0-97cfa31319b6
59 lines
2.0 KiB
C++
59 lines
2.0 KiB
C++
//+----------------------------------------------------------------------------+
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//| Description: Magic Set Editor - Program to make Magic (tm) cards |
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//| Copyright: (C) 2001 - 2006 Twan van Laarhoven |
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//| License: GNU General Public License 2 or later (see file COPYING) |
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//+----------------------------------------------------------------------------+
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// ----------------------------------------------------------------------------- : Includes
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#include <gfx/gfx.hpp>
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// ----------------------------------------------------------------------------- : Color utility functions
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Color lerp(const Color& a, const Color& b, double t) {
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return Color(a.Red() + (b.Red() - a.Red() ) * t,
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a.Green() + (b.Green() - a.Green()) * t,
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a.Blue() + (b.Blue() - a.Blue() ) * t);
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}
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int hsl2rgbp(double t1, double t2, double t3) {
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// adjust t3 to [0...1)
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if (t3 < 0.0) t3 += 1;
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else if (t3 > 1.0) t3 -= 1;
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// determine color
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if (6.0 * t3 < 1) return (int)(255 * (t1 + (t2-t1) * 6.0 * t3) );
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if (2.0 * t3 < 1) return (int)(255 * (t2) );
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if (3.0 * t3 < 2) return (int)(255 * (t1 + (t2-t1) * 6.0 * (2.0/3.0 - t3)) );
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else return (int)(255 * (t1) );
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}
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Color hsl2rgb(double h, double s, double l) {
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double t2 = l < 0.5 ? l * (1.0 + s) :
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l * (1.0 - s) + s;
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double t1 = 2.0 * l - t2;
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return Color(
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hsl2rgbp(t1, t2, h + 1.0/3.0),
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hsl2rgbp(t1, t2, h) ,
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hsl2rgbp(t1, t2, h - 1.0/3.0)
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);
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}
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Color darken(const Color& c) {
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return Color(
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c.Red() * 8 / 10,
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c.Green() * 8 / 10,
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c.Blue() * 8 / 10
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);
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}
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Color saturate(const Color& c, double amount) {
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int r = c.Red(), g = c.Green(), b = c.Blue();
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double l = (r + g + b) / 3;
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return Color(
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col((r - amount * l) / (1 - amount)),
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col((g - amount * l) / (1 - amount)),
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col((b - amount * l) / (1 - amount))
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);
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}
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