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/* 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"
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.
*/
/* must be first to be stored in a hash table */
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;
/* 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;
cairo_bool_t placeholder; /* protected by fontmap mutex */
cairo_bool_t finished;
/* "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_cache_t *glyphs; /* glyph index -> cairo_scaled_glyph_t */
/*
* 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 */
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