1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
|
/*
* Copyright © 2005 Red Hat, Inc.
*
* Permission to use, copy, modify, distribute, and sell this software
* and its documentation for any purpose is hereby granted without
* fee, provided that the above copyright notice appear in all copies
* and that both that copyright notice and this permission notice
* appear in supporting documentation, and that the name of
* Red Hat, Inc. not be used in advertising or publicity pertaining to
* distribution of the software without specific, written prior
* permission. Red Hat, Inc. makes no representations about the
* suitability of this software for any purpose. It is provided "as
* is" without express or implied warranty.
*
* RED HAT, INC. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
* SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS, IN NO EVENT SHALL RED HAT, INC. BE LIABLE FOR ANY SPECIAL,
* INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
* RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
* IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Author: Owen Taylor <otaylor@redhat.com>
*/
#include <math.h>
#include "cairo-test.h"
#include <stdio.h>
#define SIZE 100
#define BORDER 10
#define LINE_WIDTH 20
static void
_propagate_status (cairo_t *dst, cairo_t *src)
{
cairo_path_t path;
path.status = cairo_status (src);
if (path.status) {
path.num_data = 0;
path.data = NULL;
cairo_append_path (dst, &path);
}
}
static cairo_test_status_t
draw (cairo_t *cr, int width, int height)
{
cairo_surface_t *target_surface;
cairo_t *cr2, *cr3;
target_surface = cairo_get_group_target (cr);
cr2 = cairo_create (target_surface);
/* Draw a diagonal line and clip to it */
cairo_move_to (cr2, BORDER, BORDER);
cairo_line_to (cr2, BORDER + LINE_WIDTH, BORDER);
cairo_line_to (cr2, SIZE - BORDER, SIZE - BORDER);
cairo_line_to (cr2, SIZE - BORDER - LINE_WIDTH, SIZE - BORDER);
cairo_clip (cr2);
cairo_set_source_rgb (cr2, 0, 0, 1); /* Blue */
cairo_paint (cr2);
/* Clipping affects this cairo_t */
cairo_set_source_rgb (cr2, 1, 1, 1); /* White */
cairo_rectangle (cr2,
SIZE / 2 - LINE_WIDTH / 2, BORDER,
LINE_WIDTH, SIZE - 2 * BORDER);
cairo_fill (cr2);
/* But doesn't affect another cairo_t that we create temporarily for
* the same surface
*/
cr3 = cairo_create (target_surface);
cairo_set_source_rgb (cr3, 1, 1, 1); /* White */
cairo_rectangle (cr3,
SIZE - BORDER - LINE_WIDTH, BORDER,
LINE_WIDTH, SIZE - 2 * BORDER);
cairo_fill (cr3);
_propagate_status (cr, cr3);
cairo_destroy (cr3);
_propagate_status (cr, cr2);
cairo_destroy (cr2);
/* And doesn't affect anything after this cairo_t is destroyed */
cairo_set_source_rgb (cr, 1, 1, 1); /* White */
cairo_rectangle (cr,
BORDER, BORDER,
LINE_WIDTH, SIZE - 2 * BORDER);
cairo_fill (cr);
return CAIRO_TEST_SUCCESS;
}
CAIRO_TEST (clip_nesting,
"Test clipping with multiple contexts for the same surface",
"clip", /* keywords */
NULL, /* requirements */
SIZE, SIZE,
NULL, draw)
|
