cairo/test/clip-fill-rule.c

   1 /*
   2  * Copyright © 2004 Red Hat, Inc.
   3  *
   4  * Permission to use, copy, modify, distribute, and sell this software
   5  * and its documentation for any purpose is hereby granted without
   6  * fee, provided that the above copyright notice appear in all copies
   7  * and that both that copyright notice and this permission notice
   8  * appear in supporting documentation, and that the name of
   9  * Red Hat, Inc. not be used in advertising or publicity pertaining to
  10  * distribution of the software without specific, written prior
  11  * permission. Red Hat, Inc. makes no representations about the
  12  * suitability of this software for any purpose.  It is provided "as
  13  * is" without express or implied warranty.
  14  *
  15  * RED HAT, INC. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
  16  * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
  17  * FITNESS, IN NO EVENT SHALL RED HAT, INC. BE LIABLE FOR ANY SPECIAL,
  18  * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
  19  * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
  20  * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
  21  * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  22  *
  23  * Author: Carl D. Worth <cworth@cworth.org>
  24  */
  25
  26 #include "cairo-test.h"
  27
  28 #define STAR_SIZE 20
  29
  30 static cairo_test_draw_function_t draw;
  31
  32 static const cairo_test_t test = {
  33     "clip-fill-rule",
  34     "Tests interaction of clipping with cairo_set_fill_rule",
  35     STAR_SIZE * 2 + 2, STAR_SIZE + 2,
  36     draw
  37 };
  38
  39 static void
  40 star_path (cairo_t *cr)
  41 {
  42     cairo_move_to (cr, 10, 0);
  43     cairo_rel_line_to (cr, 6, 20);
  44     cairo_rel_line_to (cr, -16, -12);
  45     cairo_rel_line_to (cr, 20, 0);
  46     cairo_rel_line_to (cr, -16, 12);
  47 }
  48
  49 /* Use clipping to draw the same path twice, once with each fill rule */
  50 static cairo_test_status_t
  51 draw (cairo_t *cr, int width, int height)
  52 {
  53     cairo_set_source_rgb (cr, 1, 0, 0);
  54
  55     cairo_translate (cr, 1, 1);
  56     cairo_save (cr);
  57     {
  58         star_path (cr);
  59         cairo_set_fill_rule (cr, CAIRO_FILL_RULE_WINDING);
  60         cairo_clip (cr);
  61         cairo_paint (cr);
  62     }
  63     cairo_restore (cr);
  64
  65     cairo_translate (cr, STAR_SIZE + 1, 0);
  66     cairo_save (cr);
  67     {
  68         star_path (cr);
  69         cairo_set_fill_rule (cr, CAIRO_FILL_RULE_EVEN_ODD);
  70         cairo_clip (cr);
  71         cairo_paint (cr);
  72     }
  73     cairo_restore (cr);
  74
  75     return CAIRO_TEST_SUCCESS;
  76 }
  77
  78 int
  79 main (void)
  80 {
  81     return cairo_test (&test);
  82 }