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Diffstat (limited to 'gfx/cairo/cairo/src/cairo-scaled-font-private.h')
| -rw-r--r-- | gfx/cairo/cairo/src/cairo-scaled-font-private.h | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/gfx/cairo/cairo/src/cairo-scaled-font-private.h b/gfx/cairo/cairo/src/cairo-scaled-font-private.h new file mode 100644 index 000000000..029377b17 --- /dev/null +++ b/gfx/cairo/cairo/src/cairo-scaled-font-private.h @@ -0,0 +1,131 @@ +/* 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 */ |