2 * Copyright © 2008 Chris Wilson
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.
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.
23 * Author: Chris Wilson <chris@chris-wilson.co.uk>
26 #include "cairo-test.h"
28 #define SIZE 60 /* needs to be big to check large area effects (dithering) */
31 static cairo_test_status_t
32 draw (cairo_t *cr, int width, int height)
34 const double alpha = 1./3;
35 cairo_pattern_t *pattern;
38 /* draw a simple pattern behind */
39 pattern = cairo_pattern_create_linear (0, 0, width, height);
40 cairo_pattern_add_color_stop_rgb (pattern, 0, 1, 1, 0);
41 cairo_pattern_add_color_stop_rgb (pattern, 1, 1, 1, 1);
42 cairo_set_source (cr, pattern);
43 cairo_pattern_destroy (pattern);
47 cairo_rectangle (cr, PAD, PAD, SIZE, SIZE);
48 cairo_set_source_rgba (cr, 1, 0, 0, alpha);
52 cairo_translate (cr, SIZE + 2 * PAD, 0);
53 cairo_arc (cr, PAD + SIZE / 2., PAD + SIZE / 2., SIZE / 2., 0, 2 * M_PI);
54 cairo_set_source_rgba (cr, 0, 1, 0, alpha);
58 cairo_translate (cr, 0, SIZE + 2 * PAD);
59 cairo_move_to (cr, PAD + SIZE / 2, PAD);
60 cairo_line_to (cr, PAD + SIZE, PAD + SIZE);
61 cairo_line_to (cr, PAD, PAD + SIZE);
62 cairo_set_source_rgba (cr, 0, 0, 1, alpha);
66 cairo_translate (cr, -(SIZE + 2 * PAD) + SIZE/2., SIZE/2.);
67 for (n = 0; n < 5; n++) {
69 SIZE/2 * cos (2*n * 2*M_PI / 10),
70 SIZE/2 * sin (2*n * 2*M_PI / 10));
73 SIZE/4 * cos ((2*n+1)*2*M_PI / 10),
74 SIZE/4 * sin ((2*n+1)*2*M_PI / 10));
76 cairo_set_source_rgba (cr, 0, 0, 0, alpha);
79 return CAIRO_TEST_SUCCESS;
82 CAIRO_TEST (fill_alpha_pattern,
83 "Tests using set_rgba();fill() over a linear gradient",
84 "fill, alpha", /* keywords */
85 NULL, /* requirements */
86 2*SIZE + 4*PAD, 2*SIZE + 4*PAD,