column/ColorTools.h
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 /*
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 */
 
 /*******************************************************************************
 /
 /	File:			ColorTools.h
 /
 /   Description:    Additional experimental color manipulation functions.
 /
 /	Copyright 2000, Be Incorporated, All Rights Reserved
 /
 *******************************************************************************/
 
 
 #ifndef _COLOR_TOOLS_H
 #define _COLOR_TOOLS_H
 
 #include <GraphicsDefs.h>
 
 #if B_BEOS_VERSION <= B_BEOS_VERSION_MAUI
 
 namespace BExperimental {
 
 // Comparison operators.
 
 inline bool operator==(const rgb_color c1, const rgb_color c2)
 {
 	return (*((uint32*)&c1)) == (*((uint32*)&c2));
 }
 
 inline bool operator!=(const rgb_color c1, const rgb_color c2)
 {
 	return (*((uint32*)&c1)) != (*((uint32*)&c2));
 }
 
 // Color creation.
 
 inline rgb_color make_color(uint8 red, uint8 green, uint8 blue, uint8 alpha=255)
 {
 	rgb_color c;
 	c.red = red;
 	c.green = green;
 	c.blue = blue;
 	c.alpha = alpha;
 	return c;
 }
 
 // Mix two colors together, ignoring their relative alpha channels.
 // If amount is 0, the result is color1; if 255, the result is color2;
 // if another value, it is somewhere in-between.  The resulting alpha
 // channel is mixed exactly like the other color channels.
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 rgb_color mix_color(rgb_color color1, rgb_color color2, uint8 amount);
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 // Blend two colors together, weighting by their relative alpha channels.
 // The resulting color is the same as mix_color(), except that the amount
 // used from color1 and color2's color channels is dependent on that color's
 // alpha channel.  For example, if color1.alpha is 0 and color2.alpha is
 // 255, the resulting red, green, and blue values will be the same as those
 // in color2, regardless of 'amount'.
 rgb_color blend_color(rgb_color color1, rgb_color color2, uint8 amount);
 
 // Return a color that is the disabled representation of 'color' when drawn
 // on a solid color 'background'.
 rgb_color disable_color(rgb_color color, rgb_color background);
 
 }	// namespace BExperimental
 
 using namespace BExperimental;
 
 #endif
 
 #endif