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
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
|
/* cairo - a vector graphics library with display and print output
*
* Copyright © 2002 University of Southern California
* Copyright © 2005 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it either under the terms of the GNU Lesser General Public
* License version 2.1 as published by the Free Software Foundation
* (the "LGPL") or, at your option, under the terms of the Mozilla
* Public License Version 1.1 (the "MPL"). If you do not alter this
* notice, a recipient may use your version of this file under either
* the MPL or the LGPL.
*
* You should have received a copy of the LGPL along with this library
* in the file COPYING-LGPL-2.1; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
* You should have received a copy of the MPL along with this library
* in the file COPYING-MPL-1.1
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
* OF ANY KIND, either express or implied. See the LGPL or the MPL for
* the specific language governing rights and limitations.
*
* The Original Code is the cairo graphics library.
*
* The Initial Developer of the Original Code is University of Southern
* California.
*
* Contributor(s):
* Carl D. Worth <cworth@cworth.org>
*/
#ifndef CAIRO_SCALED_FONT_PRIVATE_H
#define CAIRO_SCALED_FONT_PRIVATE_H
#include "cairo.h"
#include "cairo-types-private.h"
#include "cairo-mutex-type-private.h"
#include "cairo-reference-count-private.h"
typedef struct _cairo_scaled_glyph_page cairo_scaled_glyph_page_t;
struct _cairo_scaled_font {
/* For most cairo objects, the rule for multiple threads is that
* the user is responsible for any locking if the same object is
* manipulated from multiple threads simultaneously.
*
* However, with the caching that cairo does for scaled fonts, a
* user can easily end up with the same cairo_scaled_font object
* being manipulated from multiple threads without the user ever
* being aware of this, (and in fact, unable to control it).
*
* So, as a special exception, the cairo implementation takes care
* of all locking needed for cairo_scaled_font_t. Most of what is
* in the scaled font is immutable, (which is what allows for the
* sharing in the first place). The things that are modified and
* the locks protecting them are as follows:
*
* 1. The reference count (scaled_font->ref_count)
*
* Modifications to the reference count are protected by the
* _cairo_scaled_font_map_mutex. This is because the reference
* count of a scaled font is intimately related with the font
* map itself, (and the magic holdovers array).
*
* 2. The cache of glyphs (scaled_font->glyphs)
* 3. The backend private data (scaled_font->surface_backend,
* scaled_font->surface_private)
*
* Modifications to these fields are protected with locks on
* scaled_font->mutex in the generic scaled_font code.
*/
cairo_hash_entry_t hash_entry;
/* useful bits for _cairo_scaled_font_nil */
cairo_status_t status;
cairo_reference_count_t ref_count;
cairo_user_data_array_t user_data;
cairo_font_face_t *original_font_face; /* may be NULL */
/* hash key members */
cairo_font_face_t *font_face; /* may be NULL */
cairo_matrix_t font_matrix; /* font space => user space */
cairo_matrix_t ctm; /* user space => device space */
cairo_font_options_t options;
unsigned int placeholder : 1; /* protected by fontmap mutex */
unsigned int holdover : 1;
unsigned int finished : 1;
/* "live" scaled_font members */
cairo_matrix_t scale; /* font space => device space */
cairo_matrix_t scale_inverse; /* device space => font space */
double max_scale; /* maximum x/y expansion of scale */
cairo_font_extents_t extents; /* user space */
cairo_font_extents_t fs_extents; /* font space */
/* The mutex protects modification to all subsequent fields. */
cairo_mutex_t mutex;
cairo_hash_table_t *glyphs;
cairo_scaled_glyph_page_t *glyph_pages;
cairo_bool_t cache_frozen;
cairo_bool_t global_cache_frozen;
/*
* One surface backend may store data in each glyph.
* Whichever surface manages to store its pointer here
* first gets to store data in each glyph
*/
const cairo_surface_backend_t *surface_backend;
void *surface_private;
/* font backend managing this scaled font */
const cairo_scaled_font_backend_t *backend;
};
#endif /* CAIRO_SCALED_FONT_PRIVATE_H */
|
