css.h

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/*
 * Copyright 2009 John-Mark Bell <jmb@netsurf-browser.org>
 *
 * This file is part of NetSurf, http://www.netsurf-browser.org/
 *
 * NetSurf 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; version 2 of the License.
 *
 * NetSurf 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, see <http://www.gnu.org/licenses/>.
 */
 
/**
 * \file
 * Netsurf core css API
 */
 
#ifndef _NETSURF_CSS_H_
#define _NETSURF_CSS_H_
 
/**
 * Convert a CSS color to a NetSurf colour primitive
 *
 * ARGB -> (1-A)BGR
 *
 * \param c The CSS color to convert
 * \return Corresponding NetSurf colour primitive
 */
#define nscss_color_to_ns(c) \
                ( ((~c) & 0xff000000)        | \
                 ((( c) & 0xff0000  ) >> 16) | \
                  (( c) & 0xff00    )        | \
                 ((( c) & 0xff      ) << 16))
 
 
/**
 * Convert a NetSurf color to a CSS colour primitive
 *
 * (1-A)BGR -> ARGB
 *
 * \param c The NetSurf color to convert
 * \return Corresponding CSS colour primitive
 */
#define ns_color_to_nscss(c) \
                ( ((~c) & 0xff000000)        | \
                 ((( c) & 0xff0000  ) >> 16) | \
                  (( c) & 0xff00    )        | \
                 ((( c) & 0xff      ) << 16))
 
/**
 * Determine if a CSS color primitive is transparent
 *
 * \param color  The CSS color to consider
 * \return True if the color is transparent, false otherwise
 */
#define nscss_color_is_transparent(color) \
                (((color) >> 24) == 0)
 
#endif