cairo/test/smask-mask.c

   1 /*
   2  * Copyright © 2008 Chris Wilson
   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  * Chris Wilson not be used in advertising or publicity pertaining to
  10  * distribution of the software without specific, written prior
  11  * permission. Chris Wilson 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  * CHRIS WILSON DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
  16  * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
  17  * FITNESS, IN NO EVENT SHALL CHRIS WILSON 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: Chris Wilson <chris@chris-wilson.co.uk>
  24  */
  25
  26 #include "cairo-test.h"
  27
  28 static cairo_test_draw_function_t draw;
  29
  30 static const cairo_test_t test = {
  31     "smask-mask",
  32     "Test the support of \"soft\" masks with a secondary mask",
  33     60, 60,
  34     draw
  35 };
  36
  37 static cairo_test_status_t
  38 draw (cairo_t *cr, int width, int height)
  39 {
  40     cairo_surface_t *mask;
  41     cairo_pattern_t *pattern;
  42     cairo_t *cr2, *cr3;
  43
  44     cairo_set_source_rgb (cr, 0, 0, 1.0);
  45     cairo_paint (cr);
  46
  47     mask = cairo_surface_create_similar (cairo_get_group_target (cr),
  48                                          CAIRO_CONTENT_ALPHA,
  49                                          width, height);
  50     cr2 = cairo_create (mask);
  51     cairo_surface_destroy (mask);
  52
  53     mask = cairo_surface_create_similar (cairo_get_group_target (cr2),
  54                                        CAIRO_CONTENT_ALPHA,
  55                                        width, height);
  56     cr3 = cairo_create (mask);
  57     cairo_surface_destroy (mask);
  58
  59     cairo_save (cr3); {
  60         cairo_set_operator (cr3, CAIRO_OPERATOR_CLEAR);
  61         cairo_paint (cr3);
  62     } cairo_restore (cr3);
  63
  64     pattern = cairo_pattern_create_linear (0, 0, width, height);
  65     cairo_pattern_add_color_stop_rgba (pattern, 0.00, 0., 0., 0., 0.);
  66     cairo_pattern_add_color_stop_rgba (pattern, 0.25, 1., 1., 1., 1.);
  67     cairo_pattern_add_color_stop_rgba (pattern, 0.50, 1., 1., 1., .5);
  68     cairo_pattern_add_color_stop_rgba (pattern, 0.75, 1., 1., 1., 1.);
  69     cairo_pattern_add_color_stop_rgba (pattern, 1.00, 0., 0., 0., 0.);
  70     cairo_set_source (cr3, pattern);
  71     cairo_pattern_destroy (pattern);
  72     cairo_paint (cr3);
  73
  74
  75     cairo_save (cr2); {
  76         cairo_set_operator (cr2, CAIRO_OPERATOR_CLEAR);
  77         cairo_paint (cr2);
  78     } cairo_restore (cr2);
  79
  80     pattern = cairo_pattern_create_radial (
  81             0.5 * width, 0.5 * height, 0,
  82             0.5 * width, 0.5 * height, 0.5 *height);
  83     cairo_pattern_add_color_stop_rgba (pattern, 0.00, 0., 0., 0., 0.);
  84     cairo_pattern_add_color_stop_rgba (pattern, 0.25, 1., 1., 1., 1.);
  85     cairo_pattern_add_color_stop_rgba (pattern, 0.50, 1., 1., 1., .5);
  86     cairo_pattern_add_color_stop_rgba (pattern, 1.00, 1., 1., 1., 1.);
  87     cairo_set_source (cr2, pattern);
  88     cairo_pattern_destroy (pattern);
  89
  90     cairo_mask_surface (cr2, cairo_get_target (cr3), 0, 0);
  91     cairo_destroy (cr3);
  92
  93     cairo_set_source_rgb (cr, 1.0, 0, 0);
  94     cairo_mask_surface (cr, cairo_get_target (cr2), 0, 0);
  95     cairo_destroy (cr2);
  96
  97     return CAIRO_TEST_SUCCESS;
  98 }
  99
 100 int
 101 main (void)
 102 {
 103     return cairo_test (&test);
 104 }