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97 lines
2.7 KiB
C
97 lines
2.7 KiB
C
/* cairo - a vector graphics library with display and print output
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*
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* Copyright © 2002 University of Southern California
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*
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* This library is free software; you can redistribute it and/or
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* modify it either under the terms of the GNU Lesser General Public
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* License version 2.1 as published by the Free Software Foundation
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* (the "LGPL") or, at your option, under the terms of the Mozilla
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* Public License Version 1.1 (the "MPL"). If you do not alter this
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* notice, a recipient may use your version of this file under either
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* the MPL or the LGPL.
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*
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* You should have received a copy of the LGPL along with this library
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* in the file COPYING-LGPL-2.1; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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* You should have received a copy of the MPL along with this library
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* in the file COPYING-MPL-1.1
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*
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* The contents of this file are subject to the Mozilla Public License
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* Version 1.1 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
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* OF ANY KIND, either express or implied. See the LGPL or the MPL for
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* the specific language governing rights and limitations.
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*
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* The Original Code is the cairo graphics library.
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*
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* The Initial Developer of the Original Code is University of Southern
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* California.
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*
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* Contributor(s):
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* Carl D. Worth <cworth@cworth.org>
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*/
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#include "cairoint.h"
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static cairo_color_t const CAIRO_COLOR_WHITE = {
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1.0, 1.0, 1.0, 1.0,
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0xffff, 0xffff, 0xffff, 0xffff
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};
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static void
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_cairo_color_compute_shorts (cairo_color_t *color);
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void
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_cairo_color_init (cairo_color_t *color)
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{
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*color = CAIRO_COLOR_WHITE;
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}
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void
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_cairo_color_fini (cairo_color_t *color)
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{
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/* Nothing to do here */
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}
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void
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_cairo_color_set_rgb (cairo_color_t *color, double red, double green, double blue)
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{
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color->red = red;
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color->green = green;
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color->blue = blue;
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_cairo_color_compute_shorts (color);
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}
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void
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_cairo_color_get_rgb (const cairo_color_t *color,
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double *red, double *green, double *blue)
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{
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if (red)
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*red = color->red;
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if (green)
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*green = color->green;
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if (blue)
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*blue = color->blue;
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}
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void
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_cairo_color_set_alpha (cairo_color_t *color, double alpha)
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{
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color->alpha = alpha;
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_cairo_color_compute_shorts (color);
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}
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static void
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_cairo_color_compute_shorts (cairo_color_t *color)
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{
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color->red_short = (color->red * color->alpha) * 0xffff;
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color->green_short = (color->green * color->alpha) * 0xffff;
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color->blue_short = (color->blue * color->alpha) * 0xffff;
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color->alpha_short = color->alpha * 0xffff;
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}
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