test/gradient-alpha.c

   1 /*
   2  * Copyright © 2005 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 static cairo_test_draw_function_t draw;
  29
  30 cairo_test_t test = {
  31     "gradient-alpha",
  32     "Tests drawing of a gradient with various alpha values in the color stops\n",
  33     10, 10,
  34     draw
  35 };
  36
  37 static cairo_test_status_t
  38 draw (cairo_t *cr, int width, int height)
  39 {
  40     cairo_pattern_t *gradient;
  41
  42     gradient = cairo_pattern_create_linear (0, -height,
  43                                             0, height);
  44     cairo_pattern_add_color_stop_rgba (gradient, 0.0,
  45                                        1.0, 0.0, 0.0,
  46                                        1.0);
  47     cairo_pattern_add_color_stop_rgba (gradient, 1.0,
  48                                        0.0, 0.0, 1.0,
  49                                        0.5);
  50
  51     cairo_set_source (cr, gradient);
  52
  53     cairo_paint (cr);
  54
  55     cairo_pattern_destroy (gradient);
  56
  57     return CAIRO_TEST_SUCCESS;
  58 }
  59
  60 int
  61 main (void)
  62 {
  63     return cairo_test (&test);
  64 }