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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., 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 */