/* cairo - a vector graphics library with display and print output * * Copyright ? 2002 University of Southern California * Copyright ? 2005 Red Hat, Inc. * * This library is free software; you can redistribute it and/or * modify it either under the terms of the GNU Lesser General Public * License version 2.1 as published by the Free Software Foundation * (the "LGPL") or, at your option, under the terms of the Mozilla * Public License Version 1.1 (the "MPL"). If you do not alter this * notice, a recipient may use your version of this file under either * the MPL or the LGPL. * * You should have received a copy of the LGPL along with this library * in the file COPYING-LGPL-2.1; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * You should have received a copy of the MPL along with this library * in the file COPYING-MPL-1.1 * * The contents of this file are subject to the Mozilla Public License * Version 1.1 (the "License"); you may not use this file except in * compliance with the License. You may obtain a copy of the License at * http://www.mozilla.org/MPL/ * * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY * OF ANY KIND, either express or implied. See the LGPL or the MPL for * the specific language governing rights and limitations. * * The Original Code is the cairo graphics library. * * The Initial Developer of the Original Code is University of Southern * California. * * Contributor(s): *	Carl D. Worth <cworth@cworth.org> */#include "cairoint.h"static cairo_color_t const cairo_color_white = {    1.0,    1.0,    1.0,    1.0,    0xffff, 0xffff, 0xffff, 0xffff};static cairo_color_t const cairo_color_black = {    0.0, 0.0, 0.0, 1.0,    0x0, 0x0, 0x0, 0xffff};static cairo_color_t const cairo_color_transparent = {    0.0, 0.0, 0.0, 0.0,    0x0, 0x0, 0x0, 0x0};static cairo_color_t const cairo_color_magenta = {    1.0,    0.0, 1.0,    1.0,    0xffff, 0x0, 0xffff, 0xffff};const cairo_color_t *_cairo_stock_color (cairo_stock_t stock){    switch (stock) {    case CAIRO_STOCK_WHITE:	return &cairo_color_white;    case CAIRO_STOCK_BLACK:	return &cairo_color_black;    case CAIRO_STOCK_TRANSPARENT:	return &cairo_color_transparent;    }    ASSERT_NOT_REACHED;    /* If the user can get here somehow, give a color that indicates a     * problem. */    return &cairo_color_magenta;}void_cairo_color_init (cairo_color_t *color){    *color = cairo_color_white;}void_cairo_color_init_rgb (cairo_color_t *color,		       double red, double green, double blue){    _cairo_color_init_rgba (color, red, green, blue, 1.0);}/* We multiply colors by (0x10000 - epsilon), such that we get a uniform * range even for 0xffff.  In other words, (1.0 - epsilon) would convert * to 0xffff, not 0xfffe. */#define CAIRO_COLOR_ONE_MINUS_EPSILON (65536.0 - 1e-5)static void_cairo_color_compute_shorts (cairo_color_t *color){    color->red_short   = color->red   * color->alpha * CAIRO_COLOR_ONE_MINUS_EPSILON;    color->green_short = color->green * color->alpha * CAIRO_COLOR_ONE_MINUS_EPSILON;    color->blue_short  = color->blue  * color->alpha * CAIRO_COLOR_ONE_MINUS_EPSILON;    color->alpha_short = color->alpha * CAIRO_COLOR_ONE_MINUS_EPSILON;}void_cairo_color_init_rgba (cairo_color_t *color,			double red, double green, double blue,			double alpha){    color->red   = red;    color->green = green;    color->blue  = blue;    color->alpha = alpha;    _cairo_color_compute_shorts (color);}void_cairo_color_multiply_alpha (cairo_color_t *color,			     double	    alpha){    color->alpha *= alpha;    _cairo_color_compute_shorts (color);}void_cairo_color_get_rgba (cairo_color_t *color,		       double	     *red,		       double	     *green,		       double	     *blue,		       double	     *alpha){    *red   = color->red;    *green = color->green;    *blue  = color->blue;    *alpha = color->alpha;}void_cairo_color_get_rgba_premultiplied (cairo_color_t *color,				     double	   *red,				     double	   *green,				     double	   *blue,				     double	   *alpha){    *red   = color->red   * color->alpha;    *green = color->green * color->alpha;    *blue  = color->blue  * color->alpha;    *alpha = color->alpha;}