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/**
* $Id$
*
* ***** BEGIN GPL/BL DUAL LICENSE BLOCK *****
*
* 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 2
* of the License, or (at your option) any later version. The Blender
* Foundation also sells licenses for use in proprietary software under
* the Blender License. See http://www.blender.org/BL/ for information
* about this.
*
* 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, write to the Free Software Foundation,
* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
* All rights reserved.
*
* The Original Code is: all of this file.
*
* Contributor(s): none yet.
*
* ***** END GPL/BL DUAL LICENSE BLOCK *****
* @author Maarten Gribnau
* @date March 7, 2001
*/
#ifndef _H_IMG_Color
#define _H_IMG_Color
class IMG_ColorRGBA;
/**
* Implements a color with red, green and blue components.
* Components are stored as floats.
* @author Maarten Gribnau
* @date March 7, 2001
*/
class IMG_ColorRGB {
public:
/**
* Constructs a color with the given values.
* @param r requested red component of the color
* @param g requested green component of the color
* @param b requested blue component of the color
*/
IMG_ColorRGB(float r=0, float g=0, float b=0)
: m_r(r), m_g(g), m_b(b) {}
/**
* Copy constructor.
* @param c the color to copy.
*/
IMG_ColorRGB(const IMG_ColorRGB& c)
: m_r(c.m_r), m_g(c.m_g), m_b(c.m_b) {}
/**
* Constructs a color without alpha from one with.
* @param c the color to copy.
*/
inline IMG_ColorRGB(const IMG_ColorRGBA& c);
/** Red component of the color */
float m_r;
/** Green component of the color */
float m_g;
/** Blue component of the color */
float m_b;
};
/**
* Implements a color with red, green, blue and alpha components.
* Components are stored as floats.
* @author Maarten Gribnau
* @date March 6, 2001
*/
class IMG_ColorRGBA {
public:
/**
* Constructs a color with the given values.
* @param r requested red component of the color
* @param g requested green component of the color
* @param b requested blue component of the color
* @param a requested alpha component of the color
*/
IMG_ColorRGBA(float r=0, float g=0, float b=0, float a=0)
: m_r(r), m_g(g), m_b(b), m_a(a) {}
/**
* Copy constructor.
* @param c the color to copy.
*/
IMG_ColorRGBA(const IMG_ColorRGBA& c)
: m_r(c.m_r), m_g(c.m_g), m_b(c.m_b), m_a(c.m_a) {}
/**
* Constructs a color with alpha from one without.
* @param c the color to copy.
*/
IMG_ColorRGBA(const IMG_ColorRGB& c)
: m_r(c.m_r), m_g(c.m_g), m_b(c.m_b), m_a(0) {}
/**
* Blends the given color with this color.
* Uses the alpha of the given color for blending.
* The alpha of this color is left untouched.
* @param c the color to blend
*/
inline void blendColor(const IMG_ColorRGBA& c);
/** Red component of the color */
float m_r;
/** Green component of the color */
float m_g;
/** Blue component of the color */
float m_b;
/** Alpha component of the color */
float m_a;
};
inline IMG_ColorRGB::IMG_ColorRGB(const IMG_ColorRGBA& c)
: m_r(c.m_r), m_g(c.m_g), m_b(c.m_b) {}
inline void IMG_ColorRGBA::blendColor(const IMG_ColorRGBA& c)
{
float r1 = 1 - c.m_a; // The reverse of alpha
#if IMG_REVERSED_ALPHA
m_r = c.m_a * m_r + r1 * c.m_r;
m_g = c.m_a * m_g + r1 * c.m_g;
m_b = c.m_a * m_b + r1 * c.m_b;
#else
m_r = r1 * m_r + c.m_a * c.m_r;
m_g = r1 * m_g + c.m_a * c.m_g;
m_b = r1 * m_b + c.m_a * c.m_b;
#endif
}
#endif // _H_IMG_Color
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