/* 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., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, 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-list-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_list_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; cairo_list_t link; }; cairo_private void _cairo_scaled_font_revoke_ownership (cairo_scaled_font_t *scaled_font); #endif /* CAIRO_SCALED_FONT_PRIVATE_H */