LCOV - code coverage report
Current view: directory - gfx/cairo/cairo/src - cairo-color.c (source / functions) Found Hit Coverage
Test: app.info Lines: 71 0 0.0 %
Date: 2012-06-02 Functions: 12 0 0.0 %

       1                 : /* cairo - a vector graphics library with display and print output
       2                 :  *
       3                 :  * Copyright © 2002 University of Southern California
       4                 :  * Copyright © 2005 Red Hat, Inc.
       5                 :  *
       6                 :  * This library is free software; you can redistribute it and/or
       7                 :  * modify it either under the terms of the GNU Lesser General Public
       8                 :  * License version 2.1 as published by the Free Software Foundation
       9                 :  * (the "LGPL") or, at your option, under the terms of the Mozilla
      10                 :  * Public License Version 1.1 (the "MPL"). If you do not alter this
      11                 :  * notice, a recipient may use your version of this file under either
      12                 :  * the MPL or the LGPL.
      13                 :  *
      14                 :  * You should have received a copy of the LGPL along with this library
      15                 :  * in the file COPYING-LGPL-2.1; if not, write to the Free Software
      16                 :  * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
      17                 :  * You should have received a copy of the MPL along with this library
      18                 :  * in the file COPYING-MPL-1.1
      19                 :  *
      20                 :  * The contents of this file are subject to the Mozilla Public License
      21                 :  * Version 1.1 (the "License"); you may not use this file except in
      22                 :  * compliance with the License. You may obtain a copy of the License at
      23                 :  * http://www.mozilla.org/MPL/
      24                 :  *
      25                 :  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
      26                 :  * OF ANY KIND, either express or implied. See the LGPL or the MPL for
      27                 :  * the specific language governing rights and limitations.
      28                 :  *
      29                 :  * The Original Code is the cairo graphics library.
      30                 :  *
      31                 :  * The Initial Developer of the Original Code is University of Southern
      32                 :  * California.
      33                 :  *
      34                 :  * Contributor(s):
      35                 :  *      Carl D. Worth <cworth@cworth.org>
      36                 :  */
      37                 : 
      38                 : #include "cairoint.h"
      39                 : 
      40                 : static cairo_color_t const cairo_color_white = {
      41                 :     1.0,    1.0,    1.0,    1.0,
      42                 :     0xffff, 0xffff, 0xffff, 0xffff
      43                 : };
      44                 : 
      45                 : static cairo_color_t const cairo_color_black = {
      46                 :     0.0, 0.0, 0.0, 1.0,
      47                 :     0x0, 0x0, 0x0, 0xffff
      48                 : };
      49                 : 
      50                 : static cairo_color_t const cairo_color_transparent = {
      51                 :     0.0, 0.0, 0.0, 0.0,
      52                 :     0x0, 0x0, 0x0, 0x0
      53                 : };
      54                 : 
      55                 : static cairo_color_t const cairo_color_magenta = {
      56                 :     1.0,    0.0, 1.0,    1.0,
      57                 :     0xffff, 0x0, 0xffff, 0xffff
      58                 : };
      59                 : 
      60                 : const cairo_color_t *
      61               0 : _cairo_stock_color (cairo_stock_t stock)
      62                 : {
      63               0 :     switch (stock) {
      64                 :     case CAIRO_STOCK_WHITE:
      65               0 :         return &cairo_color_white;
      66                 :     case CAIRO_STOCK_BLACK:
      67               0 :         return &cairo_color_black;
      68                 :     case CAIRO_STOCK_TRANSPARENT:
      69               0 :         return &cairo_color_transparent;
      70                 : 
      71                 :     case CAIRO_STOCK_NUM_COLORS:
      72                 :     default:
      73               0 :         ASSERT_NOT_REACHED;
      74                 :         /* If the user can get here somehow, give a color that indicates a
      75                 :          * problem. */
      76               0 :         return &cairo_color_magenta;
      77                 :     }
      78                 : }
      79                 : 
      80                 : void
      81               0 : _cairo_color_init (cairo_color_t *color)
      82                 : {
      83               0 :     *color = cairo_color_white;
      84               0 : }
      85                 : 
      86                 : void
      87               0 : _cairo_color_init_rgb (cairo_color_t *color,
      88                 :                        double red, double green, double blue)
      89                 : {
      90               0 :     _cairo_color_init_rgba (color, red, green, blue, 1.0);
      91               0 : }
      92                 : 
      93                 : /* Convert a double in [0.0, 1.0] to an integer in [0, 65535]
      94                 :  * The conversion is designed to divide the input range into 65536
      95                 :  * equally-sized regions. This is achieved by multiplying by 65536 and
      96                 :  * then special-casing the result of an input value of 1.0 so that it
      97                 :  * maps to 65535 instead of 65536.
      98                 :  */
      99                 : uint16_t
     100               0 : _cairo_color_double_to_short (double d)
     101                 : {
     102                 :     uint32_t i;
     103               0 :     i = (uint32_t) (d * 65536);
     104               0 :     i -= (i >> 16);
     105               0 :     return i;
     106                 : }
     107                 : 
     108                 : static void
     109               0 : _cairo_color_compute_shorts (cairo_color_t *color)
     110                 : {
     111               0 :     color->red_short   = _cairo_color_double_to_short (color->red   * color->alpha);
     112               0 :     color->green_short = _cairo_color_double_to_short (color->green * color->alpha);
     113               0 :     color->blue_short  = _cairo_color_double_to_short (color->blue  * color->alpha);
     114               0 :     color->alpha_short = _cairo_color_double_to_short (color->alpha);
     115               0 : }
     116                 : 
     117                 : void
     118               0 : _cairo_color_init_rgba (cairo_color_t *color,
     119                 :                         double red, double green, double blue,
     120                 :                         double alpha)
     121                 : {
     122               0 :     color->red   = red;
     123               0 :     color->green = green;
     124               0 :     color->blue  = blue;
     125               0 :     color->alpha = alpha;
     126                 : 
     127               0 :     _cairo_color_compute_shorts (color);
     128               0 : }
     129                 : 
     130                 : void
     131               0 : _cairo_color_multiply_alpha (cairo_color_t *color,
     132                 :                              double         alpha)
     133                 : {
     134               0 :     color->alpha *= alpha;
     135                 : 
     136               0 :     _cairo_color_compute_shorts (color);
     137               0 : }
     138                 : 
     139                 : void
     140               0 : _cairo_color_get_rgba (cairo_color_t *color,
     141                 :                        double        *red,
     142                 :                        double        *green,
     143                 :                        double        *blue,
     144                 :                        double        *alpha)
     145                 : {
     146               0 :     *red   = color->red;
     147               0 :     *green = color->green;
     148               0 :     *blue  = color->blue;
     149               0 :     *alpha = color->alpha;
     150               0 : }
     151                 : 
     152                 : void
     153               0 : _cairo_color_get_rgba_premultiplied (cairo_color_t *color,
     154                 :                                      double        *red,
     155                 :                                      double        *green,
     156                 :                                      double        *blue,
     157                 :                                      double        *alpha)
     158                 : {
     159               0 :     *red   = color->red   * color->alpha;
     160               0 :     *green = color->green * color->alpha;
     161               0 :     *blue  = color->blue  * color->alpha;
     162               0 :     *alpha = color->alpha;
     163               0 : }
     164                 : 
     165                 : /* NB: This function works both for unmultiplied and premultiplied colors */
     166                 : cairo_bool_t
     167               0 : _cairo_color_equal (const cairo_color_t *color_a,
     168                 :                     const cairo_color_t *color_b)
     169                 : {
     170               0 :     if (color_a == color_b)
     171               0 :         return TRUE;
     172                 : 
     173               0 :     if (color_a->alpha_short != color_b->alpha_short)
     174               0 :         return FALSE;
     175                 : 
     176               0 :     if (color_a->alpha_short == 0)
     177               0 :         return TRUE;
     178                 : 
     179               0 :     return color_a->red_short   == color_b->red_short   &&
     180               0 :            color_a->green_short == color_b->green_short &&
     181               0 :            color_a->blue_short  == color_b->blue_short;
     182                 : }
     183                 : 
     184                 : cairo_bool_t
     185               0 : _cairo_color_stop_equal (const cairo_color_stop_t *color_a,
     186                 :                          const cairo_color_stop_t *color_b)
     187                 : {
     188               0 :     if (color_a == color_b)
     189               0 :         return TRUE;
     190                 : 
     191               0 :     return color_a->alpha_short == color_b->alpha_short &&
     192               0 :            color_a->red_short   == color_b->red_short   &&
     193               0 :            color_a->green_short == color_b->green_short &&
     194               0 :            color_a->blue_short  == color_b->blue_short;
     195                 : }
     196                 : 
     197                 : cairo_content_t
     198               0 : _cairo_color_get_content (const cairo_color_t *color)
     199                 : {
     200               0 :     if (CAIRO_COLOR_IS_OPAQUE (color))
     201               0 :         return CAIRO_CONTENT_COLOR;
     202                 : 
     203               0 :     if (color->red_short == 0 &&
     204               0 :         color->green_short == 0 &&
     205               0 :         color->blue_short == 0)
     206                 :     {
     207               0 :         return CAIRO_CONTENT_ALPHA;
     208                 :     }
     209                 : 
     210               0 :     return CAIRO_CONTENT_COLOR_ALPHA;
     211                 : }

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