forked from KolibriOS/kolibrios
132 lines
5.0 KiB
C
132 lines
5.0 KiB
C
/* cairo - a vector graphics library with display and print output
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*
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* Copyright © 2002 University of Southern California
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* Copyright © 2005 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it either under the terms of the GNU Lesser General Public
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* License version 2.1 as published by the Free Software Foundation
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* (the "LGPL") or, at your option, under the terms of the Mozilla
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* Public License Version 1.1 (the "MPL"). If you do not alter this
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* notice, a recipient may use your version of this file under either
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* the MPL or the LGPL.
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*
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* You should have received a copy of the LGPL along with this library
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* in the file COPYING-LGPL-2.1; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
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* You should have received a copy of the MPL along with this library
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* in the file COPYING-MPL-1.1
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*
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* The contents of this file are subject to the Mozilla Public License
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* Version 1.1 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
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* OF ANY KIND, either express or implied. See the LGPL or the MPL for
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* the specific language governing rights and limitations.
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*
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* The Original Code is the cairo graphics library.
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*
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* The Initial Developer of the Original Code is University of Southern
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* California.
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*
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* Contributor(s):
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* Carl D. Worth <cworth@cworth.org>
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*/
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#ifndef CAIRO_SCALED_FONT_PRIVATE_H
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#define CAIRO_SCALED_FONT_PRIVATE_H
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#include "cairo.h"
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#include "cairo-types-private.h"
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#include "cairo-list-private.h"
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#include "cairo-mutex-type-private.h"
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#include "cairo-reference-count-private.h"
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typedef struct _cairo_scaled_glyph_page cairo_scaled_glyph_page_t;
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struct _cairo_scaled_font {
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/* For most cairo objects, the rule for multiple threads is that
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* the user is responsible for any locking if the same object is
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* manipulated from multiple threads simultaneously.
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*
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* However, with the caching that cairo does for scaled fonts, a
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* user can easily end up with the same cairo_scaled_font object
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* being manipulated from multiple threads without the user ever
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* being aware of this, (and in fact, unable to control it).
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*
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* So, as a special exception, the cairo implementation takes care
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* of all locking needed for cairo_scaled_font_t. Most of what is
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* in the scaled font is immutable, (which is what allows for the
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* sharing in the first place). The things that are modified and
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* the locks protecting them are as follows:
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*
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* 1. The reference count (scaled_font->ref_count)
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*
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* Modifications to the reference count are protected by the
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* _cairo_scaled_font_map_mutex. This is because the reference
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* count of a scaled font is intimately related with the font
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* map itself, (and the magic holdovers array).
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*
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* 2. The cache of glyphs (scaled_font->glyphs)
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* 3. The backend private data (scaled_font->surface_backend,
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* scaled_font->surface_private)
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*
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* Modifications to these fields are protected with locks on
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* scaled_font->mutex in the generic scaled_font code.
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*/
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cairo_hash_entry_t hash_entry;
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/* useful bits for _cairo_scaled_font_nil */
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cairo_status_t status;
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cairo_reference_count_t ref_count;
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cairo_user_data_array_t user_data;
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cairo_font_face_t *original_font_face; /* may be NULL */
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/* hash key members */
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cairo_font_face_t *font_face; /* may be NULL */
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cairo_matrix_t font_matrix; /* font space => user space */
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cairo_matrix_t ctm; /* user space => device space */
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cairo_font_options_t options;
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unsigned int placeholder : 1; /* protected by fontmap mutex */
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unsigned int holdover : 1;
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unsigned int finished : 1;
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/* "live" scaled_font members */
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cairo_matrix_t scale; /* font space => device space */
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cairo_matrix_t scale_inverse; /* device space => font space */
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double max_scale; /* maximum x/y expansion of scale */
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cairo_font_extents_t extents; /* user space */
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cairo_font_extents_t fs_extents; /* font space */
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/* The mutex protects modification to all subsequent fields. */
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cairo_mutex_t mutex;
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cairo_hash_table_t *glyphs;
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cairo_list_t glyph_pages;
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cairo_bool_t cache_frozen;
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cairo_bool_t global_cache_frozen;
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/*
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* One surface backend may store data in each glyph.
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* Whichever surface manages to store its pointer here
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* first gets to store data in each glyph
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*/
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const cairo_surface_backend_t *surface_backend;
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void *surface_private;
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/* font backend managing this scaled font */
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const cairo_scaled_font_backend_t *backend;
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cairo_list_t link;
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};
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cairo_private void
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_cairo_scaled_font_revoke_ownership (cairo_scaled_font_t *scaled_font);
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#endif /* CAIRO_SCALED_FONT_PRIVATE_H */
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