/*
 * color.h -- basic color routines
 *
 * Copyright (c) 2020 David Demelier <markand@malikania.fr>
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#ifndef MOLKO_COLOR_H
#define MOLKO_COLOR_H

/**
 * \file color.h
 * \brief Basic color routines.
 */

/**
 * Get red component of hexadecimal color.
 *
 * \param c the hexadecimal color
 * \return the red component
 */
#define COLOR_R(c)              (c >> 24 & 0xff)

/**
 * Get green component of hexadecimal color.
 *
 * \param c the hexadecimal color
 * \return the green component
 */
#define COLOR_G(c)              (c >> 16 & 0xff)

/**
 * Get blue component of hexadecimal color.
 *
 * \param c the hexadecimal color
 * \return the blue component
 */
#define COLOR_B(c)              (c >> 8  & 0xff)

/**
 * Get alpha component of hexadecimal color.
 *
 * \param c the hexadecimal color
 * \return the alpha component
 */
#define COLOR_A(c)              (c       & 0xff)

/**
 * Convert individual RGBA components into a hexadecimal color.
 *
 * \param r the red component
 * \param g the green component
 * \param b the blue component
 * \param a the alpha component
 * \return the hexadecimal color
 */
#define COLOR_HEX(r, g, b, a)   \
        (r << 24 & 0xff000000 | \
         g << 16 & 0x00ff0000 | \
         b << 8  & 0x0000ff00 | \
         a       & 0x000000ff)

#endif /* !MOLKO_COLOR_H */