2 * Copyright © 2007 Red Hat, Inc.
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:
12 * The above copyright notice and this permission notice shall be
13 * included in all copies or substantial portions of the Software.
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
24 * Author: Carl Worth <cworth@cworth.org>
27 #include "cairo-test.h"
29 /* This test case is designed to exercise the following bug:
31 * Skew transforms were broken by the cairo update in December
32 * https://bugzilla.mozilla.org/show_bug.cgi?id=373632
34 * What's happening is that the rectangle is being skewed into the
45 * and the bug is that _cairo_traps_tessellate_convex_quad is
46 * comparing b.x as less then d.x and therfore determining that the bc
47 * edge is left of the ad edge. The fix is simply to compare c.x to
48 * d.x instead of b.x to d.x .
53 #define LINE_LENGTH (2 * LINE_WIDTH)
54 #define SKEW_FACTOR 5.0
55 #define WIDTH (PAD + (LINE_LENGTH * SKEW_FACTOR) + LINE_WIDTH + PAD)
56 #define HEIGHT (PAD + LINE_WIDTH + (LINE_LENGTH * SKEW_FACTOR) + LINE_WIDTH + PAD)
58 static cairo_test_status_t
59 draw (cairo_t *cr, int width, int height)
61 /* We draw in the default black, so paint white first. */
63 cairo_set_source_rgb (cr, 1.0, 1.0, 1.0); /* white */
67 cairo_translate (cr, PAD, PAD);
69 cairo_set_line_width (cr, LINE_WIDTH);
70 cairo_set_line_cap (cr, CAIRO_LINE_CAP_BUTT);
74 cairo_matrix_t skew_x = {
80 cairo_translate (cr, LINE_WIDTH / 2.0, 0.0);
82 cairo_transform (cr, &skew_x);
84 cairo_move_to (cr, 0.0, 0.0);
85 cairo_line_to (cr, 0.0, LINE_LENGTH);
90 cairo_translate (cr, 0.0, LINE_WIDTH);
94 cairo_matrix_t skew_y = {
100 cairo_translate (cr, 0.0, LINE_WIDTH / 2.0);
102 cairo_transform (cr, &skew_y);
104 cairo_move_to (cr, 0.0, 0.0);
105 cairo_line_to (cr, LINE_LENGTH, 0.0);
110 return CAIRO_TEST_SUCCESS;
113 CAIRO_TEST (skew_extreme,
114 "Test cases of extreme skew.",
115 "transform, stroke", /* keywords */
116 NULL, /* requirements */