1 /* -*- Mode: c; c-basic-offset: 4; indent-tabs-mode: t; tab-width: 8; -*- */
3 * Copyright 2009 Andrea Canciani
5 * Permission is hereby granted, free of charge, to any person
6 * obtaining a copy of this software and associated documentation
7 * files (the "Software"), to deal in the Software without
8 * restriction, including without limitation the rights to use, copy,
9 * modify, merge, publish, distribute, sublicense, and/or sell copies
10 * of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be
14 * included in all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
17 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
18 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
19 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
20 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
21 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
25 * Author: Andrea Canciani <ranma42@gmail.com>
28 #include "cairo-test.h"
30 /* Lengths of the dashes of the dash patterns */
31 static const double dashes[] = { 2, 2, 4, 4 };
32 /* Dash offset in userspace units
33 * They always grow by 2, so the dash pattern is
34 * should be shifted by the same amount each time */
35 static const double frac_offset[] = { 0, 2, 4, 6 };
36 /* Dash offset relative to the whole dash pattern
37 * This corresponds to the non-inverted part only if
38 * the dash pattern has odd length, so the expected result
39 * is the same for every int_offset if the pattern has
40 * even length, and inverted each time (or shifted by half
41 * period, which is the same) if the pattern has odd length. */
42 static const double int_offset[] = { -2, -1, 0, 1, 2 };
45 #define STROKE_LENGTH 32
46 #define IMAGE_WIDTH (PAD + (STROKE_LENGTH + PAD) * ARRAY_LENGTH (dashes))
47 #define IMAGE_HEIGHT (PAD + PAD * ARRAY_LENGTH (int_offset) + PAD * ARRAY_LENGTH (frac_offset) * ARRAY_LENGTH (int_offset))
50 static cairo_test_status_t
51 draw (cairo_t *cr, int width, int height)
56 cairo_set_source_rgb (cr, 1, 1, 1);
59 cairo_set_source_rgb (cr, 0, 0, 0);
60 cairo_set_line_width (cr, 2);
63 for (k = 0; k < ARRAY_LENGTH (dashes); ++k) {
65 for (i = 0; i < ARRAY_LENGTH (frac_offset); ++i) {
66 for (j = 0; j < ARRAY_LENGTH (int_offset); ++j) {
67 cairo_set_dash (cr, dashes, k + 1, frac_offset[i] + total * int_offset[j]);
68 cairo_move_to (cr, (STROKE_LENGTH + PAD) * k + PAD, PAD * (i + j + ARRAY_LENGTH (frac_offset) * j + 1));
69 cairo_line_to (cr, (STROKE_LENGTH + PAD) * (k + 1), PAD * (i + j + ARRAY_LENGTH (frac_offset) * j + 1));
75 return CAIRO_TEST_SUCCESS;
78 CAIRO_TEST (dash_offset,
79 "Tests dashes of different length with various offsets",
80 "stroke, dash", /* keywords */
81 NULL, /* requirements */
82 IMAGE_WIDTH, IMAGE_HEIGHT,