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/* -*- Mode: c; c-basic-offset: 4; indent-tabs-mode: t; tab-width: 8; -*- */
/* 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
*
* 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>
* Graydon Hoare <graydon@redhat.com>
* Owen Taylor <otaylor@redhat.com>
*/
#include "cairoint.h"
#include "cairo-error-private.h"
/**
* SECTION:cairo-font-face
* @Title: cairo_font_face_t
* @Short_Description: Base class for font faces
* @See_Also: #cairo_scaled_font_t
*
* #cairo_font_face_t represents a particular font at a particular weight,
* slant, and other characteristic but no size, transformation, or size.
*
* Font faces are created using <firstterm>font-backend</firstterm>-specific
* constructors, typically of the form
* <function>cairo_<emphasis>backend</emphasis>_font_face_create(<!-- -->)</function>,
* or implicitly using the <firstterm>toy</firstterm> text API by way of
* cairo_select_font_face(). The resulting face can be accessed using
* cairo_get_font_face().
**/
/* #cairo_font_face_t */
const cairo_font_face_t _cairo_font_face_nil = {
{ 0 }, /* hash_entry */
CAIRO_STATUS_NO_MEMORY, /* status */
CAIRO_REFERENCE_COUNT_INVALID, /* ref_count */
{ 0, 0, 0, NULL }, /* user_data */
NULL
};
const cairo_font_face_t _cairo_font_face_nil_file_not_found = {
{ 0 }, /* hash_entry */
CAIRO_STATUS_FILE_NOT_FOUND, /* status */
CAIRO_REFERENCE_COUNT_INVALID, /* ref_count */
{ 0, 0, 0, NULL }, /* user_data */
NULL
};
cairo_status_t
_cairo_font_face_set_error (cairo_font_face_t *font_face,
cairo_status_t status)
{
if (status == CAIRO_STATUS_SUCCESS)
return status;
/* Don't overwrite an existing error. This preserves the first
* error, which is the most significant. */
_cairo_status_set_error (&font_face->status, status);
return _cairo_error (status);
}
void
_cairo_font_face_init (cairo_font_face_t *font_face,
const cairo_font_face_backend_t *backend)
{
CAIRO_MUTEX_INITIALIZE ();
font_face->status = CAIRO_STATUS_SUCCESS;
CAIRO_REFERENCE_COUNT_INIT (&font_face->ref_count, 1);
font_face->backend = backend;
_cairo_user_data_array_init (&font_face->user_data);
}
/**
* cairo_font_face_reference:
* @font_face: a #cairo_font_face_t, (may be %NULL in which case this
* function does nothing).
*
* Increases the reference count on @font_face by one. This prevents
* @font_face from being destroyed until a matching call to
* cairo_font_face_destroy() is made.
*
* Use cairo_font_face_get_reference_count() to get the number of
* references to a #cairo_font_face_t.
*
* Return value: the referenced #cairo_font_face_t.
*
* Since: 1.0
**/
cairo_font_face_t *
cairo_font_face_reference (cairo_font_face_t *font_face)
{
if (font_face == NULL ||
CAIRO_REFERENCE_COUNT_IS_INVALID (&font_face->ref_count))
return font_face;
/* We would normally assert that we have a reference here but we
* can't get away with that due to the zombie case as documented
* in _cairo_ft_font_face_destroy. */
_cairo_reference_count_inc (&font_face->ref_count);
return font_face;
}
slim_hidden_def (cairo_font_face_reference);
static inline cairo_bool_t
__put(cairo_reference_count_t *v)
{
int c, old;
c = CAIRO_REFERENCE_COUNT_GET_VALUE(v);
while (c != 1 && (old = _cairo_atomic_int_cmpxchg_return_old(&v->ref_count, c, c - 1)) != c)
c = old;
return c != 1;
}
cairo_bool_t
_cairo_font_face_destroy (void *abstract_face)
{
#if 0 /* Nothing needs to be done, we can just drop the last reference */
cairo_font_face_t *font_face = abstract_face;
return _cairo_reference_count_dec_and_test (&font_face->ref_count);
#endif
return TRUE;
}
/**
* cairo_font_face_destroy:
* @font_face: a #cairo_font_face_t
*
* Decreases the reference count on @font_face by one. If the result
* is zero, then @font_face and all associated resources are freed.
* See cairo_font_face_reference().
*
* Since: 1.0
**/
void
cairo_font_face_destroy (cairo_font_face_t *font_face)
{
if (font_face == NULL ||
CAIRO_REFERENCE_COUNT_IS_INVALID (&font_face->ref_count))
return;
assert (CAIRO_REFERENCE_COUNT_HAS_REFERENCE (&font_face->ref_count));
/* We allow resurrection to deal with some memory management for the
* FreeType backend where cairo_ft_font_face_t and cairo_ft_unscaled_font_t
* need to effectively mutually reference each other
*/
if (__put (&font_face->ref_count))
return;
if (! font_face->backend->destroy (font_face))
return;
_cairo_user_data_array_fini (&font_face->user_data);
free (font_face);
}
slim_hidden_def (cairo_font_face_destroy);
/**
* cairo_font_face_get_type:
* @font_face: a font face
*
* This function returns the type of the backend used to create
* a font face. See #cairo_font_type_t for available types.
*
* Return value: The type of @font_face.
*
* Since: 1.2
**/
cairo_font_type_t
cairo_font_face_get_type (cairo_font_face_t *font_face)
{
if (CAIRO_REFERENCE_COUNT_IS_INVALID (&font_face->ref_count))
return CAIRO_FONT_TYPE_TOY;
return font_face->backend->type;
}
/**
* cairo_font_face_get_reference_count:
* @font_face: a #cairo_font_face_t
*
* Returns the current reference count of @font_face.
*
* Return value: the current reference count of @font_face. If the
* object is a nil object, 0 will be returned.
*
* Since: 1.4
**/
unsigned int
cairo_font_face_get_reference_count (cairo_font_face_t *font_face)
{
if (font_face == NULL ||
CAIRO_REFERENCE_COUNT_IS_INVALID (&font_face->ref_count))
return 0;
return CAIRO_REFERENCE_COUNT_GET_VALUE (&font_face->ref_count);
}
/**
* cairo_font_face_status:
* @font_face: a #cairo_font_face_t
*
* Checks whether an error has previously occurred for this
* font face
*
* Return value: %CAIRO_STATUS_SUCCESS or another error such as
* %CAIRO_STATUS_NO_MEMORY.
*
* Since: 1.0
**/
cairo_status_t
cairo_font_face_status (cairo_font_face_t *font_face)
{
return font_face->status;
}
/**
* cairo_font_face_get_user_data:
* @font_face: a #cairo_font_face_t
* @key: the address of the #cairo_user_data_key_t the user data was
* attached to
*
* Return user data previously attached to @font_face using the specified
* key. If no user data has been attached with the given key this
* function returns %NULL.
*
* Return value: the user data previously attached or %NULL.
*
* Since: 1.0
**/
void *
cairo_font_face_get_user_data (cairo_font_face_t *font_face,
const cairo_user_data_key_t *key)
{
return _cairo_user_data_array_get_data (&font_face->user_data,
key);
}
slim_hidden_def (cairo_font_face_get_user_data);
/**
* cairo_font_face_set_user_data:
* @font_face: a #cairo_font_face_t
* @key: the address of a #cairo_user_data_key_t to attach the user data to
* @user_data: the user data to attach to the font face
* @destroy: a #cairo_destroy_func_t which will be called when the
* font face is destroyed or when new user data is attached using the
* same key.
*
* Attach user data to @font_face. To remove user data from a font face,
* call this function with the key that was used to set it and %NULL
* for @data.
*
* Return value: %CAIRO_STATUS_SUCCESS or %CAIRO_STATUS_NO_MEMORY if a
* slot could not be allocated for the user data.
*
* Since: 1.0
**/
cairo_status_t
cairo_font_face_set_user_data (cairo_font_face_t *font_face,
const cairo_user_data_key_t *key,
void *user_data,
cairo_destroy_func_t destroy)
{
if (CAIRO_REFERENCE_COUNT_IS_INVALID (&font_face->ref_count))
return font_face->status;
return _cairo_user_data_array_set_data (&font_face->user_data,
key, user_data, destroy);
}
slim_hidden_def (cairo_font_face_set_user_data);
void
_cairo_unscaled_font_init (cairo_unscaled_font_t *unscaled_font,
const cairo_unscaled_font_backend_t *backend)
{
CAIRO_REFERENCE_COUNT_INIT (&unscaled_font->ref_count, 1);
unscaled_font->backend = backend;
}
cairo_unscaled_font_t *
_cairo_unscaled_font_reference (cairo_unscaled_font_t *unscaled_font)
{
if (unscaled_font == NULL)
return NULL;
assert (CAIRO_REFERENCE_COUNT_HAS_REFERENCE (&unscaled_font->ref_count));
_cairo_reference_count_inc (&unscaled_font->ref_count);
return unscaled_font;
}
void
_cairo_unscaled_font_destroy (cairo_unscaled_font_t *unscaled_font)
{
if (unscaled_font == NULL)
return;
assert (CAIRO_REFERENCE_COUNT_HAS_REFERENCE (&unscaled_font->ref_count));
if (__put (&unscaled_font->ref_count))
return;
if (! unscaled_font->backend->destroy (unscaled_font))
return;
free (unscaled_font);
}