1 /*
2 * Copyright © 2015 Adrian Johnson
3 *
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.
14 *
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.
22 *
23 * Author: Adrian Johnson <ajohnson@redneon.com>
24 */
25
26 #include "cairo-test.h"
27
28 #define CELL_WIDTH 20
29 #define CELL_HEIGHT 20
30 #define PAD 2
31 #define IMAGE_WIDTH (CELL_WIDTH*3 + PAD*4)
32 #define IMAGE_HEIGHT (CELL_HEIGHT*4 + PAD*5)
33
34
35 static void
draw_lines(cairo_t * cr)36 draw_lines(cairo_t *cr)
37 {
38 /* horizontal line */
39 cairo_translate (cr, PAD, PAD);
40 cairo_move_to (cr, 0, CELL_HEIGHT/2);
41 cairo_line_to (cr, CELL_WIDTH, CELL_HEIGHT/2);
42 cairo_stroke (cr);
43
44 /* vertical line */
45 cairo_translate (cr, 0, CELL_HEIGHT + PAD);
46 cairo_move_to (cr, CELL_WIDTH/2, 0);
47 cairo_line_to (cr, CELL_WIDTH/2, CELL_HEIGHT);
48 cairo_stroke (cr);
49
50 /* diagonal line */
51 cairo_translate (cr, 0, CELL_HEIGHT + PAD);
52 cairo_move_to (cr, 0, CELL_HEIGHT);
53 cairo_line_to (cr, CELL_WIDTH, 0);
54 cairo_stroke (cr);
55
56 /* curved line */
57 cairo_translate (cr, 0, CELL_HEIGHT + PAD);
58 cairo_move_to (cr, CELL_WIDTH, 0);
59 cairo_curve_to (cr, 0, 0,
60 CELL_WIDTH, CELL_HEIGHT,
61 0, CELL_HEIGHT);
62 cairo_stroke (cr);
63 }
64
65 #define FIXED_POINT_MIN (1.0/256)
66
67 static cairo_test_status_t
draw(cairo_t * cr,int width,int height)68 draw (cairo_t *cr, int width, int height)
69 {
70 cairo_save (cr);
71 cairo_set_line_width (cr, FIXED_POINT_MIN*10.0);
72 draw_lines (cr);
73 cairo_restore (cr);
74
75 cairo_translate (cr, CELL_WIDTH + PAD, 0);
76 cairo_save (cr);
77 cairo_set_line_width (cr, FIXED_POINT_MIN);
78 draw_lines (cr);
79 cairo_restore (cr);
80
81 cairo_translate (cr, CELL_WIDTH + PAD, 0);
82 cairo_save (cr);
83 cairo_set_line_width (cr, FIXED_POINT_MIN/10.0);
84 draw_lines (cr);
85 cairo_restore (cr);
86
87 return CAIRO_TEST_SUCCESS;
88 }
89
90 CAIRO_TEST (thin_lines,
91 "Tests that very thin lines are output to vector surfaces",
92 "stroke", /* keywords */
93 NULL, /* requirements */
94 IMAGE_WIDTH, IMAGE_HEIGHT,
95 NULL, draw)
96