test/smask-text.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 cairo_test_t test = {
  31     "smask-text",
  32     "Test the support of \"soft\" masks with text",
  33     120, 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;
  43     cairo_text_extents_t extents;
  44
  45     mask = cairo_surface_create_similar (cairo_get_group_target (cr),
  46                                          CAIRO_CONTENT_ALPHA,
  47                                          width, height);
  48     cr2 = cairo_create (mask);
  49
  50     cairo_save (cr2); {
  51         cairo_set_operator (cr2, CAIRO_OPERATOR_CLEAR);
  52         cairo_paint (cr2);
  53     } cairo_restore (cr2);
  54
  55     pattern = cairo_pattern_create_linear (0, 0, width, height);
  56     cairo_pattern_add_color_stop_rgba (pattern, 0.00, 0., 0., 0., 0.);
  57     cairo_pattern_add_color_stop_rgba (pattern, 0.25, 1., 1., 1., 1.);
  58     cairo_pattern_add_color_stop_rgba (pattern, 0.50, 1., 1., 1., .5);
  59     cairo_pattern_add_color_stop_rgba (pattern, 0.75, 1., 1., 1., 1.);
  60     cairo_pattern_add_color_stop_rgba (pattern, 1.00, 0., 0., 0., 0.);
  61     cairo_set_source (cr2, pattern);
  62     cairo_pattern_destroy (pattern);
  63
  64     cairo_select_font_face (cr2,
  65                             "Bitstream Vera Sans",
  66                             CAIRO_FONT_SLANT_NORMAL,
  67                             CAIRO_FONT_WEIGHT_NORMAL);
  68     cairo_set_font_size (cr2, 0.5 * height);
  69
  70     cairo_text_extents (cr2, "cairo", &extents);
  71     cairo_move_to (cr2,
  72                    floor ((width - extents.width) / 2 + 0.5) - extents.x_bearing,
  73                    floor ((height - extents.height) / 2 - 0.5) - extents.y_bearing);
  74     cairo_show_text (cr2, "cairo");
  75     cairo_destroy (cr2);
  76
  77     cairo_set_source_rgb (cr, 0, 0, 1.0);
  78     cairo_paint (cr);
  79
  80     cairo_set_source_rgb (cr, 1.0, 0, 0);
  81     cairo_mask_surface (cr, mask, 0, 0);
  82     cairo_surface_destroy (mask);
  83
  84     return CAIRO_TEST_SUCCESS;
  85 }
  86
  87 int
  88 main (void)
  89 {
  90     return cairo_test (&test);
  91 }
  92