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#ifndef __color_h__ 
#define __color_h__ 
 
#pragma pack(1) 
//! byte rgba color 
struct rgba 
{ 
   unsigned char r,g,b,a; 
}; 
#pragma pack() 
 
//! floating point rgba color 
struct rgbaf 
{ 
   float r,g,b,a; 
}; 
 
/*! component wise scalar multiplication 
 * \param c1 color 
 * \param s scalar value to be multiplied with the color c1 
 * \return result of multiplication 
 */ 
rgbaf operator * (rgbaf c1, float s); 
 
/*! component wise addition 
 * \param c1 first color 
 * \param c2 second coloor  
 * \return result of addition 
 */ 
rgbaf operator + (rgbaf c1, rgbaf c2); 
 
/*! converts byte color to float color 
 * \param c color 
 * \return converted color 
 */ 
rgbaf rgba2rgbaf(rgba c); 
 
/*! converts float color to byte color 
 * \param c color 
 * \return converted color 
 */ 
rgba rgbaf2rgba(rgbaf c); 
 
/*! sets color to black 
 * \param c color 
 */ 
void black(rgba &color); 
 
/*! sets color to white 
 * \param c color 
 */ 
void white(rgba &color); 
 
/*! sets color to gray  
 * \param c color 
 * \param i intensity value  
 */ 
void gray(rgba &color, unsigned char i); 
 
/*! sets color to any color 
 * \param c color 
 * \param r red component of color 
 * \param g green component of color 
 * \param b blue component of color 
 */ 
void anycolor(rgba &color, unsigned char r, unsigned char g, unsigned char b); 
 
#endif