test/rgb24-ignore-alpha.c

   1 /*
   2  * Copyright © 2007 Red Hat, Inc.
   3  *
   4  * Permission is hereby granted, free of charge, to any person
   5  * obtaining a copy of this software and associated documentation
   6  * files (the "Software"), to deal in the Software without
   7  * restriction, including without limitation the rights to use, copy,
   8  * modify, merge, publish, distribute, sublicense, and/or sell copies
   9  * of the Software, and to permit persons to whom the Software is
  10  * furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be
  13  * included in all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  16  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  18  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  19  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  20  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  21  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  22  * SOFTWARE.
  23  *
  24  * Author: Carl D. Worth <cworth@cworth.org>
  25  */
  26
  27 #include "cairo-test.h"
  28
  29 static cairo_test_draw_function_t draw;
  30
  31 #define WIDTH  2
  32 #define HEIGHT 2
  33
  34 cairo_test_t test = {
  35     "rgb24-ignore-alpha",
  36     "Test that when using an RGB24 image as a source, there is no alpha channel",
  37     WIDTH, HEIGHT,
  38     draw
  39 };
  40
  41 static cairo_test_status_t
  42 draw (cairo_t *cr, int width, int height)
  43 {
  44     cairo_surface_t *surface;
  45     /* Four green pixels with different "alpha" values, (but which
  46      * should be entirely ignored). */
  47     uint32_t colors[4] = {
  48         0xff00ff00, 0x8800ff00,
  49         0x4400ff00, 0x0000ff00
  50     };
  51
  52     surface = cairo_image_surface_create_for_data ((unsigned char *) colors,
  53                                                    CAIRO_FORMAT_RGB24, 2, 2, 8);
  54
  55     cairo_set_source_surface (cr, surface, 0, 0);
  56     cairo_paint (cr);
  57
  58     cairo_surface_destroy (surface);
  59
  60     return CAIRO_TEST_SUCCESS;
  61 }
  62
  63 int
  64 main (void)
  65 {
  66     return cairo_test (&test);
  67 }