2 * Copyright © 2005 Red Hat, Inc.
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.
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.
23 * Author: Carl D. Worth <cworth@cworth.org>
26 #include "cairo-test.h"
29 #define STAMP_HEIGHT 4
34 #define IMAGE_WIDTH (PAD + STEPS * (STAMP_WIDTH + PAD) + PAD)
35 #define IMAGE_HEIGHT (PAD + STEPS * (STAMP_HEIGHT + PAD) + PAD)
37 static cairo_test_status_t
38 draw (cairo_t *cr, int width, int height)
40 cairo_surface_t *surface;
41 uint32_t data[STAMP_WIDTH * STAMP_HEIGHT] = {
42 0xffffffff, 0xffffffff, 0xffff0000, 0xffff0000,
43 0xffffffff, 0xffffffff, 0xffff0000, 0xffff0000,
45 0xff00ff00, 0xff00ff00, 0xff0000ff, 0xff0000ff,
46 0xff00ff00, 0xff00ff00, 0xff0000ff, 0xff0000ff
50 /* fill with off-white to avoid a separate rgb24 ref image */
52 cairo_set_source_rgb (cr, .7, .7, .7);
56 /* Draw reference lines where the jump should be. */
57 cairo_move_to (cr, PAD + STEPS / 2 * (STAMP_WIDTH + PAD), 0);
58 cairo_rel_line_to (cr, 0, IMAGE_HEIGHT);
59 cairo_move_to (cr, 0, PAD + STEPS / 2 * (STAMP_HEIGHT + PAD));
60 cairo_rel_line_to (cr, IMAGE_WIDTH, 0);
61 cairo_set_line_width (cr, 2.0);
64 surface = cairo_image_surface_create_for_data ((unsigned char *) data,
70 for (j=0; j < STEPS; j++) {
73 for (i=0; i < STEPS; i++) {
76 #define GENERATE_REFERENCE_IMAGE 0
77 #if GENERATE_REFERENCE_IMAGE
78 i_step = i >= STEPS / 2 ? 1 : 0;
79 j_step = j >= STEPS / 2 ? 1 : 0;
81 i_step = i * 1.0 / STEPS;
82 j_step = j * 1.0 / STEPS;
87 cairo_set_source_surface (cr, surface,
88 PAD + i * (STAMP_WIDTH + PAD) + i_step,
89 PAD + j * (STAMP_HEIGHT + PAD) + j_step);
90 cairo_pattern_set_filter (cairo_get_source (cr), CAIRO_FILTER_NEAREST);
97 cairo_surface_finish (surface); /* data goes out of scope */
98 cairo_surface_destroy (surface);
100 return CAIRO_TEST_SUCCESS;
103 CAIRO_TEST (filter_nearest_offset,
104 "Test sampling offset of CAIRO_FILTER_NEAREST"
105 "\nwrong sampling location for nearest-neighbor filter in libpixman and Render",
106 "filter", /* keywords */
107 NULL, /* requirements */
108 IMAGE_WIDTH, IMAGE_HEIGHT,