cairo/test/smask.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",
  32     "Test the support of \"soft\" masks",
  33     60, 60,
  34     draw
  35 };
  36
  37 static cairo_test_status_t
  38 draw (cairo_t *cr, int width, int height)
  39 {
  40     uint32_t data[] = {
  41         0x80000000, 0x80000000,
  42         0x80000000, 0x80000000,
  43     };
  44
  45     cairo_surface_t *mask, *mask2;
  46     cairo_pattern_t *pattern;
  47     cairo_t *cr2;
  48     cairo_text_extents_t extents;
  49
  50     mask = cairo_surface_create_similar (cairo_get_group_target (cr),
  51                                          CAIRO_CONTENT_ALPHA,
  52                                          width, height);
  53     cr2 = cairo_create (mask);
  54     cairo_surface_destroy (mask);
  55
  56     cairo_save (cr2); {
  57         cairo_set_operator (cr2, CAIRO_OPERATOR_CLEAR);
  58         cairo_paint (cr2);
  59     } cairo_restore (cr2);
  60
  61     pattern = cairo_pattern_create_linear (0, 0, 0, height);
  62     cairo_pattern_add_color_stop_rgba (pattern, 0.00, 0., 0., 0., 0.0);
  63     cairo_pattern_add_color_stop_rgba (pattern, 0.80, 0., 0., 0., 0.0);
  64     cairo_pattern_add_color_stop_rgba (pattern, 0.90, 1., 1., 1., 0.25);
  65     cairo_pattern_add_color_stop_rgba (pattern, 1.00, 1., 1., 1., 1.0);
  66     cairo_set_source (cr2, pattern);
  67     cairo_pattern_destroy (pattern);
  68
  69     cairo_paint (cr2);
  70
  71     pattern = cairo_pattern_create_linear (0, 0, width, height);
  72     cairo_pattern_add_color_stop_rgba (pattern, 0.00, 0., 0., 0., 0.);
  73     cairo_pattern_add_color_stop_rgba (pattern, 0.25, 1., 1., 1., 1.);
  74     cairo_pattern_add_color_stop_rgba (pattern, 0.50, 1., 1., 1., .5);
  75     cairo_pattern_add_color_stop_rgba (pattern, 0.75, 1., 1., 1., 1.);
  76     cairo_pattern_add_color_stop_rgba (pattern, 1.00, 0., 0., 0., 0.);
  77     cairo_set_source (cr2, pattern);
  78     cairo_pattern_destroy (pattern);
  79
  80     mask2 = cairo_image_surface_create_for_data ((unsigned char *) data,
  81                                                 CAIRO_FORMAT_ARGB32, 2, 2, 8);
  82     pattern = cairo_pattern_create_for_surface (mask2);
  83     cairo_surface_destroy (mask2);
  84     cairo_pattern_set_extend (pattern, CAIRO_EXTEND_REPEAT);
  85     cairo_mask (cr2, pattern);
  86     cairo_pattern_destroy (pattern);
  87
  88     cairo_arc (cr2, 0.5 * width, 0.5 * height - 10, 0.2 * height, 0, 2 * M_PI);
  89     cairo_fill (cr2);
  90
  91     cairo_arc (cr2, 0.5 * width, 0.5 * height - 10, 0.25 * height, 0, 2 * M_PI);
  92     cairo_stroke (cr2);
  93
  94     cairo_select_font_face (cr2,
  95                             "Bitstream Vera Sans",
  96                             CAIRO_FONT_SLANT_NORMAL,
  97                             CAIRO_FONT_WEIGHT_NORMAL);
  98     cairo_set_font_size (cr2, 0.3 * height);
  99
 100     cairo_text_extents (cr2, "FG", &extents);
 101     cairo_move_to (cr2,
 102                    floor ((width - extents.width) / 2 + 0.5) - extents.x_bearing,
 103                    floor (height - extents.height - 0.5) - extents.y_bearing - 5);
 104     cairo_show_text (cr2, "FG");
 105
 106     cairo_set_source_rgb (cr, 0, 0, 1.0);
 107     cairo_paint (cr);
 108
 109     pattern = cairo_pattern_create_radial (
 110             0.5 * width, 0.5 * height, 0,
 111             0.5 * width, 0.5 * height, 0.5 *height);
 112     cairo_pattern_add_color_stop_rgba (pattern, 0.00, 0., 0., 0., 0.);
 113     cairo_pattern_add_color_stop_rgba (pattern, 0.25, 1., 0., 0., 1.);
 114     cairo_pattern_add_color_stop_rgba (pattern, 0.50, 1., 0., 0., .5);
 115     cairo_pattern_add_color_stop_rgba (pattern, 1.00, 1., 0., 0., 1.);
 116     cairo_set_source (cr, pattern);
 117     cairo_pattern_destroy (pattern);
 118
 119     cairo_mask_surface (cr, cairo_get_target (cr2), 0, 0);
 120     cairo_destroy (cr2);
 121
 122     return CAIRO_TEST_SUCCESS;
 123 }
 124
 125 int
 126 main (void)
 127 {
 128     return cairo_test (&test);
 129 }