source/libs/cairo/cairo-src/src/cairo-scaled-font-private.h

   1 /* cairo - a vector graphics library with display and print output
   2  *
   3  * Copyright © 2002 University of Southern California
   4  * Copyright © 2005 Red Hat, Inc.
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it either under the terms of the GNU Lesser General Public
   8  * License version 2.1 as published by the Free Software Foundation
   9  * (the "LGPL") or, at your option, under the terms of the Mozilla
  10  * Public License Version 1.1 (the "MPL"). If you do not alter this
  11  * notice, a recipient may use your version of this file under either
  12  * the MPL or the LGPL.
  13  *
  14  * You should have received a copy of the LGPL along with this library
  15  * in the file COPYING-LGPL-2.1; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
  17  * You should have received a copy of the MPL along with this library
  18  * in the file COPYING-MPL-1.1
  19  *
  20  * The contents of this file are subject to the Mozilla Public License
  21  * Version 1.1 (the "License"); you may not use this file except in
  22  * compliance with the License. You may obtain a copy of the License at
  23  * http://www.mozilla.org/MPL/
  24  *
  25  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
  26  * OF ANY KIND, either express or implied. See the LGPL or the MPL for
  27  * the specific language governing rights and limitations.
  28  *
  29  * The Original Code is the cairo graphics library.
  30  *
  31  * The Initial Developer of the Original Code is University of Southern
  32  * California.
  33  *
  34  * Contributor(s):
  35  *      Carl D. Worth <cworth@cworth.org>
  36  */
  37
  38 #ifndef CAIRO_SCALED_FONT_PRIVATE_H
  39 #define CAIRO_SCALED_FONT_PRIVATE_H
  40
  41 #include "cairo.h"
  42
  43 #include "cairo-types-private.h"
  44 #include "cairo-list-private.h"
  45 #include "cairo-mutex-type-private.h"
  46 #include "cairo-reference-count-private.h"
  47
  48 CAIRO_BEGIN_DECLS
  49
  50 typedef struct _cairo_scaled_glyph_page cairo_scaled_glyph_page_t;
  51
  52 struct _cairo_scaled_font {
  53     /* For most cairo objects, the rule for multiple threads is that
  54      * the user is responsible for any locking if the same object is
  55      * manipulated from multiple threads simultaneously.
  56      *
  57      * However, with the caching that cairo does for scaled fonts, a
  58      * user can easily end up with the same cairo_scaled_font object
  59      * being manipulated from multiple threads without the user ever
  60      * being aware of this, (and in fact, unable to control it).
  61      *
  62      * So, as a special exception, the cairo implementation takes care
  63      * of all locking needed for cairo_scaled_font_t. Most of what is
  64      * in the scaled font is immutable, (which is what allows for the
  65      * sharing in the first place). The things that are modified and
  66      * the locks protecting them are as follows:
  67      *
  68      * 1. The reference count (scaled_font->ref_count)
  69      *
  70      *    Modifications to the reference count are protected by the
  71      *    _cairo_scaled_font_map_mutex. This is because the reference
  72      *    count of a scaled font is intimately related with the font
  73      *    map itself, (and the magic holdovers array).
  74      *
  75      * 2. The cache of glyphs (scaled_font->glyphs)
  76      * 3. The backend private data (scaled_font->surface_backend,
  77      *                              scaled_font->surface_private)
  78      *
  79      *    Modifications to these fields are protected with locks on
  80      *    scaled_font->mutex in the generic scaled_font code.
  81      */
  82
  83     cairo_hash_entry_t hash_entry;
  84
  85     /* useful bits for _cairo_scaled_font_nil */
  86     cairo_status_t status;
  87     cairo_reference_count_t ref_count;
  88     cairo_user_data_array_t user_data;
  89
  90     cairo_font_face_t *original_font_face; /* may be NULL */
  91
  92     /* hash key members */
  93     cairo_font_face_t *font_face; /* may be NULL */
  94     cairo_matrix_t font_matrix;   /* font space => user space */
  95     cairo_matrix_t ctm;           /* user space => device space */
  96     cairo_font_options_t options;
  97
  98     unsigned int placeholder : 1; /*  protected by fontmap mutex */
  99     unsigned int holdover : 1;
 100     unsigned int finished : 1;
 101
 102     /* "live" scaled_font members */
 103     cairo_matrix_t scale;            /* font space => device space */
 104     cairo_matrix_t scale_inverse;    /* device space => font space */
 105     double max_scale;                /* maximum x/y expansion of scale */
 106     cairo_font_extents_t extents;    /* user space */
 107     cairo_font_extents_t fs_extents; /* font space */
 108
 109     /* The mutex protects modification to all subsequent fields. */
 110     cairo_mutex_t mutex;
 111
 112     cairo_hash_table_t *glyphs;
 113     cairo_list_t glyph_pages;
 114     cairo_bool_t cache_frozen;
 115     cairo_bool_t global_cache_frozen;
 116
 117     cairo_list_t dev_privates;
 118
 119     /* font backend managing this scaled font */
 120     const cairo_scaled_font_backend_t *backend;
 121     cairo_list_t link;
 122 };
 123
 124 struct _cairo_scaled_font_private {
 125     cairo_list_t link;
 126     const void *key;
 127     void (*destroy) (cairo_scaled_font_private_t *,
 128                      cairo_scaled_font_t *);
 129 };
 130
 131 struct _cairo_scaled_glyph {
 132     cairo_hash_entry_t hash_entry;
 133
 134     cairo_text_extents_t    metrics;            /* user-space metrics */
 135     cairo_text_extents_t    fs_metrics;         /* font-space metrics */
 136     cairo_box_t             bbox;               /* device-space bounds */
 137     int16_t                 x_advance;          /* device-space rounded X advance */
 138     int16_t                 y_advance;          /* device-space rounded Y advance */
 139
 140     unsigned int            has_info;
 141     cairo_image_surface_t   *surface;           /* device-space image */
 142     cairo_path_fixed_t      *path;              /* device-space outline */
 143     cairo_surface_t         *recording_surface; /* device-space recording-surface */
 144
 145     const void             *dev_private_key;
 146     void                   *dev_private;
 147     cairo_list_t            dev_privates;
 148 };
 149
 150 struct _cairo_scaled_glyph_private {
 151     cairo_list_t link;
 152     const void *key;
 153     void (*destroy) (cairo_scaled_glyph_private_t *,
 154                      cairo_scaled_glyph_t *,
 155                      cairo_scaled_font_t *);
 156 };
 157
 158 cairo_private cairo_scaled_font_private_t *
 159 _cairo_scaled_font_find_private (cairo_scaled_font_t *scaled_font,
 160                                  const void *key);
 161
 162 cairo_private void
 163 _cairo_scaled_font_attach_private (cairo_scaled_font_t *scaled_font,
 164                                    cairo_scaled_font_private_t *priv,
 165                                    const void *key,
 166                                    void (*destroy) (cairo_scaled_font_private_t *,
 167                                                     cairo_scaled_font_t *));
 168
 169 cairo_private cairo_scaled_glyph_private_t *
 170 _cairo_scaled_glyph_find_private (cairo_scaled_glyph_t *scaled_glyph,
 171                                  const void *key);
 172
 173 cairo_private void
 174 _cairo_scaled_glyph_attach_private (cairo_scaled_glyph_t *scaled_glyph,
 175                                    cairo_scaled_glyph_private_t *priv,
 176                                    const void *key,
 177                                    void (*destroy) (cairo_scaled_glyph_private_t *,
 178                                                     cairo_scaled_glyph_t *,
 179                                                     cairo_scaled_font_t *));
 180
 181 CAIRO_END_DECLS
 182
 183 #endif /* CAIRO_SCALED_FONT_PRIVATE_H */