2 * Copyright © 2011 Intel Corporation
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: Chris Wilson <chris@chris-wilson.co.uk>
27 #include "cairo-test.h"
29 #define LINE_WIDTH 10.
30 #define SIZE (5 * LINE_WIDTH)
31 #define PAD (3 * LINE_WIDTH)
33 static uint32_t state;
36 uniform_random (double minval, double maxval)
38 static uint32_t const poly = 0x9a795537U;
41 state = 2*state < state ? (2*state ^ poly) : 2*state;
42 return minval + state * (maxval - minval) / 4294967296.0;
46 make_path (cairo_t *cr)
52 cairo_move_to (cr, SIZE/2, SIZE/2);
53 for (i = 0; i < 200; i++) {
54 double theta = uniform_random (-M_PI, M_PI);
55 cairo_rel_line_to (cr,
56 cos (theta) * LINE_WIDTH / 4,
57 sin (theta) * LINE_WIDTH / 4);
62 draw_caps_joins (cairo_t *cr)
66 cairo_translate (cr, PAD, PAD);
68 cairo_reset_clip (cr);
69 cairo_rectangle (cr, 0, 0, SIZE, SIZE);
73 cairo_set_line_cap (cr, CAIRO_LINE_CAP_BUTT);
74 cairo_set_line_join (cr, CAIRO_LINE_JOIN_BEVEL);
77 cairo_translate (cr, SIZE + PAD, 0.);
79 cairo_reset_clip (cr);
80 cairo_rectangle (cr, 0, 0, SIZE, SIZE);
84 cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
85 cairo_set_line_join (cr, CAIRO_LINE_JOIN_ROUND);
88 cairo_translate (cr, SIZE + PAD, 0.);
90 cairo_reset_clip (cr);
91 cairo_rectangle (cr, 0, 0, SIZE, SIZE);
95 cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE);
96 cairo_set_line_join (cr, CAIRO_LINE_JOIN_MITER);
102 static cairo_test_status_t
103 draw (cairo_t *cr, int width, int height)
105 /* We draw in the default black, so paint white first. */
107 cairo_set_source_rgb (cr, 1.0, 1.0, 1.0); /* white */
111 cairo_set_line_width (cr, LINE_WIDTH);
113 draw_caps_joins (cr);
116 /* and reflect to generate the opposite vertex ordering */
117 cairo_translate (cr, 0, height);
118 cairo_scale (cr, 1, -1);
120 draw_caps_joins (cr);
123 cairo_translate (cr, 0, SIZE + PAD);
125 return CAIRO_TEST_SUCCESS;
128 CAIRO_TEST (drunkard_tails,
129 "Test caps and joins on short tail segments",
130 "stroke cap join", /* keywords */
131 NULL, /* requirements */
132 3 * (PAD + SIZE) + PAD,
133 2 * (PAD + SIZE) + PAD,