0,0 → 1,523 |
/* -*- 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 © 2005,2008 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> |
* Graydon Hoare <graydon@redhat.com> |
* Owen Taylor <otaylor@redhat.com> |
* Behdad Esfahbod <behdad@behdad.org> |
*/ |
|
#define _BSD_SOURCE /* for strdup() */ |
#include "cairoint.h" |
#include "cairo-error-private.h" |
|
|
static const cairo_font_face_t _cairo_font_face_null_pointer = { |
{ 0 }, /* hash_entry */ |
CAIRO_STATUS_NULL_POINTER, /* status */ |
CAIRO_REFERENCE_COUNT_INVALID, /* ref_count */ |
{ 0, 0, 0, NULL }, /* user_data */ |
NULL |
}; |
|
static const cairo_font_face_t _cairo_font_face_invalid_string = { |
{ 0 }, /* hash_entry */ |
CAIRO_STATUS_INVALID_STRING, /* status */ |
CAIRO_REFERENCE_COUNT_INVALID, /* ref_count */ |
{ 0, 0, 0, NULL }, /* user_data */ |
NULL |
}; |
|
static const cairo_font_face_t _cairo_font_face_invalid_slant = { |
{ 0 }, /* hash_entry */ |
CAIRO_STATUS_INVALID_SLANT, /* status */ |
CAIRO_REFERENCE_COUNT_INVALID, /* ref_count */ |
{ 0, 0, 0, NULL }, /* user_data */ |
NULL |
}; |
|
static const cairo_font_face_t _cairo_font_face_invalid_weight = { |
{ 0 }, /* hash_entry */ |
CAIRO_STATUS_INVALID_WEIGHT, /* status */ |
CAIRO_REFERENCE_COUNT_INVALID, /* ref_count */ |
{ 0, 0, 0, NULL }, /* user_data */ |
NULL |
}; |
|
|
static const cairo_font_face_backend_t _cairo_toy_font_face_backend; |
|
static int |
_cairo_toy_font_face_keys_equal (const void *key_a, |
const void *key_b); |
|
/* We maintain a hash table from family/weight/slant => |
* #cairo_font_face_t for #cairo_toy_font_t. The primary purpose of |
* this mapping is to provide unique #cairo_font_face_t values so that |
* our cache and mapping from #cairo_font_face_t => #cairo_scaled_font_t |
* works. Once the corresponding #cairo_font_face_t objects fall out of |
* downstream caches, we don't need them in this hash table anymore. |
* |
* Modifications to this hash table are protected by |
* _cairo_toy_font_face_mutex. |
*/ |
static cairo_hash_table_t *cairo_toy_font_face_hash_table = NULL; |
|
static cairo_hash_table_t * |
_cairo_toy_font_face_hash_table_lock (void) |
{ |
CAIRO_MUTEX_LOCK (_cairo_toy_font_face_mutex); |
|
if (cairo_toy_font_face_hash_table == NULL) |
{ |
cairo_toy_font_face_hash_table = |
_cairo_hash_table_create (_cairo_toy_font_face_keys_equal); |
|
if (cairo_toy_font_face_hash_table == NULL) { |
CAIRO_MUTEX_UNLOCK (_cairo_toy_font_face_mutex); |
return NULL; |
} |
} |
|
return cairo_toy_font_face_hash_table; |
} |
|
static void |
_cairo_toy_font_face_hash_table_unlock (void) |
{ |
CAIRO_MUTEX_UNLOCK (_cairo_toy_font_face_mutex); |
} |
|
/** |
* _cairo_toy_font_face_init_key: |
* |
* Initialize those portions of #cairo_toy_font_face_t needed to use |
* it as a hash table key, including the hash code buried away in |
* font_face->base.hash_entry. No memory allocation is performed here |
* so that no fini call is needed. We do this to make it easier to use |
* an automatic #cairo_toy_font_face_t variable as a key. |
**/ |
static void |
_cairo_toy_font_face_init_key (cairo_toy_font_face_t *key, |
const char *family, |
cairo_font_slant_t slant, |
cairo_font_weight_t weight) |
{ |
unsigned long hash; |
|
key->family = family; |
key->owns_family = FALSE; |
|
key->slant = slant; |
key->weight = weight; |
|
/* 1607 and 1451 are just a couple of arbitrary primes. */ |
hash = _cairo_hash_string (family); |
hash += ((unsigned long) slant) * 1607; |
hash += ((unsigned long) weight) * 1451; |
|
key->base.hash_entry.hash = hash; |
} |
|
static cairo_status_t |
_cairo_toy_font_face_create_impl_face (cairo_toy_font_face_t *font_face, |
cairo_font_face_t **impl_font_face) |
{ |
const cairo_font_face_backend_t * backend = CAIRO_FONT_FACE_BACKEND_DEFAULT; |
cairo_int_status_t status = CAIRO_INT_STATUS_UNSUPPORTED; |
|
if (unlikely (font_face->base.status)) |
return font_face->base.status; |
|
if (backend->create_for_toy != NULL && |
0 != strncmp (font_face->family, CAIRO_USER_FONT_FAMILY_DEFAULT, |
strlen (CAIRO_USER_FONT_FAMILY_DEFAULT))) |
{ |
status = backend->create_for_toy (font_face, impl_font_face); |
} |
|
if (status == CAIRO_INT_STATUS_UNSUPPORTED) { |
backend = &_cairo_user_font_face_backend; |
status = backend->create_for_toy (font_face, impl_font_face); |
} |
|
return status; |
} |
|
static cairo_status_t |
_cairo_toy_font_face_init (cairo_toy_font_face_t *font_face, |
const char *family, |
cairo_font_slant_t slant, |
cairo_font_weight_t weight) |
{ |
char *family_copy; |
cairo_status_t status; |
|
family_copy = strdup (family); |
if (unlikely (family_copy == NULL)) |
return _cairo_error (CAIRO_STATUS_NO_MEMORY); |
|
_cairo_toy_font_face_init_key (font_face, family_copy, slant, weight); |
font_face->owns_family = TRUE; |
|
_cairo_font_face_init (&font_face->base, &_cairo_toy_font_face_backend); |
|
status = _cairo_toy_font_face_create_impl_face (font_face, |
&font_face->impl_face); |
if (unlikely (status)) { |
free (family_copy); |
return status; |
} |
|
return CAIRO_STATUS_SUCCESS; |
} |
|
static void |
_cairo_toy_font_face_fini (cairo_toy_font_face_t *font_face) |
{ |
/* We assert here that we own font_face->family before casting |
* away the const qualifer. */ |
assert (font_face->owns_family); |
free ((char*) font_face->family); |
|
if (font_face->impl_face) |
cairo_font_face_destroy (font_face->impl_face); |
} |
|
static int |
_cairo_toy_font_face_keys_equal (const void *key_a, |
const void *key_b) |
{ |
const cairo_toy_font_face_t *face_a = key_a; |
const cairo_toy_font_face_t *face_b = key_b; |
|
return (strcmp (face_a->family, face_b->family) == 0 && |
face_a->slant == face_b->slant && |
face_a->weight == face_b->weight); |
} |
|
/** |
* cairo_toy_font_face_create: |
* @family: a font family name, encoded in UTF-8 |
* @slant: the slant for the font |
* @weight: the weight for the font |
* |
* Creates a font face from a triplet of family, slant, and weight. |
* These font faces are used in implementation of the the #cairo_t "toy" |
* font API. |
* |
* If @family is the zero-length string "", the platform-specific default |
* family is assumed. The default family then can be queried using |
* cairo_toy_font_face_get_family(). |
* |
* The cairo_select_font_face() function uses this to create font faces. |
* See that function for limitations and other details of toy font faces. |
* |
* Return value: a newly created #cairo_font_face_t. Free with |
* cairo_font_face_destroy() when you are done using it. |
* |
* Since: 1.8 |
**/ |
cairo_font_face_t * |
cairo_toy_font_face_create (const char *family, |
cairo_font_slant_t slant, |
cairo_font_weight_t weight) |
{ |
cairo_status_t status; |
cairo_toy_font_face_t key, *font_face; |
cairo_hash_table_t *hash_table; |
|
if (family == NULL) |
return (cairo_font_face_t*) &_cairo_font_face_null_pointer; |
|
/* Make sure we've got valid UTF-8 for the family */ |
status = _cairo_utf8_to_ucs4 (family, -1, NULL, NULL); |
if (unlikely (status)) { |
if (status == CAIRO_STATUS_INVALID_STRING) |
return (cairo_font_face_t*) &_cairo_font_face_invalid_string; |
|
return (cairo_font_face_t*) &_cairo_font_face_nil; |
} |
|
switch (slant) { |
case CAIRO_FONT_SLANT_NORMAL: |
case CAIRO_FONT_SLANT_ITALIC: |
case CAIRO_FONT_SLANT_OBLIQUE: |
break; |
default: |
return (cairo_font_face_t*) &_cairo_font_face_invalid_slant; |
} |
|
switch (weight) { |
case CAIRO_FONT_WEIGHT_NORMAL: |
case CAIRO_FONT_WEIGHT_BOLD: |
break; |
default: |
return (cairo_font_face_t*) &_cairo_font_face_invalid_weight; |
} |
|
if (*family == '\0') |
family = CAIRO_FONT_FAMILY_DEFAULT; |
|
hash_table = _cairo_toy_font_face_hash_table_lock (); |
if (unlikely (hash_table == NULL)) |
goto UNWIND; |
|
_cairo_toy_font_face_init_key (&key, family, slant, weight); |
|
/* Return existing font_face if it exists in the hash table. */ |
font_face = _cairo_hash_table_lookup (hash_table, |
&key.base.hash_entry); |
if (font_face != NULL) { |
if (font_face->base.status == CAIRO_STATUS_SUCCESS) { |
cairo_font_face_reference (&font_face->base); |
_cairo_toy_font_face_hash_table_unlock (); |
return &font_face->base; |
} |
|
/* remove the bad font from the hash table */ |
_cairo_hash_table_remove (hash_table, &font_face->base.hash_entry); |
} |
|
/* Otherwise create it and insert into hash table. */ |
font_face = malloc (sizeof (cairo_toy_font_face_t)); |
if (unlikely (font_face == NULL)) { |
status = _cairo_error (CAIRO_STATUS_NO_MEMORY); |
goto UNWIND_HASH_TABLE_LOCK; |
} |
|
status = _cairo_toy_font_face_init (font_face, family, slant, weight); |
if (unlikely (status)) |
goto UNWIND_FONT_FACE_MALLOC; |
|
assert (font_face->base.hash_entry.hash == key.base.hash_entry.hash); |
status = _cairo_hash_table_insert (hash_table, &font_face->base.hash_entry); |
if (unlikely (status)) |
goto UNWIND_FONT_FACE_INIT; |
|
_cairo_toy_font_face_hash_table_unlock (); |
|
return &font_face->base; |
|
UNWIND_FONT_FACE_INIT: |
_cairo_toy_font_face_fini (font_face); |
UNWIND_FONT_FACE_MALLOC: |
free (font_face); |
UNWIND_HASH_TABLE_LOCK: |
_cairo_toy_font_face_hash_table_unlock (); |
UNWIND: |
return (cairo_font_face_t*) &_cairo_font_face_nil; |
} |
slim_hidden_def (cairo_toy_font_face_create); |
|
static void |
_cairo_toy_font_face_destroy (void *abstract_face) |
{ |
cairo_toy_font_face_t *font_face = abstract_face; |
cairo_hash_table_t *hash_table; |
|
hash_table = _cairo_toy_font_face_hash_table_lock (); |
/* All created objects must have been mapped in the hash table. */ |
assert (hash_table != NULL); |
|
if (CAIRO_REFERENCE_COUNT_HAS_REFERENCE (&font_face->base.ref_count)) { |
/* somebody recreated the font whilst we waited for the lock */ |
_cairo_toy_font_face_hash_table_unlock (); |
return; |
} |
|
/* Font faces in SUCCESS status are guaranteed to be in the |
* hashtable. Font faces in an error status are removed from the |
* hashtable if they are found during a lookup, thus they should |
* only be removed if they are in the hashtable. */ |
if (likely (font_face->base.status == CAIRO_STATUS_SUCCESS) || |
_cairo_hash_table_lookup (hash_table, &font_face->base.hash_entry) == font_face) |
_cairo_hash_table_remove (hash_table, &font_face->base.hash_entry); |
|
_cairo_toy_font_face_hash_table_unlock (); |
|
_cairo_toy_font_face_fini (font_face); |
} |
|
static cairo_status_t |
_cairo_toy_font_face_scaled_font_create (void *abstract_font_face, |
const cairo_matrix_t *font_matrix, |
const cairo_matrix_t *ctm, |
const cairo_font_options_t *options, |
cairo_scaled_font_t **scaled_font) |
{ |
cairo_toy_font_face_t *font_face = (cairo_toy_font_face_t *) abstract_font_face; |
|
ASSERT_NOT_REACHED; |
|
return _cairo_font_face_set_error (&font_face->base, CAIRO_STATUS_FONT_TYPE_MISMATCH); |
} |
|
static cairo_font_face_t * |
_cairo_toy_font_face_get_implementation (void *abstract_font_face, |
const cairo_matrix_t *font_matrix, |
const cairo_matrix_t *ctm, |
const cairo_font_options_t *options) |
{ |
cairo_toy_font_face_t *font_face = abstract_font_face; |
|
if (font_face->impl_face) { |
cairo_font_face_t *impl = font_face->impl_face; |
|
if (impl->backend->get_implementation != NULL) { |
return impl->backend->get_implementation (impl, |
font_matrix, |
ctm, |
options); |
} |
|
return cairo_font_face_reference (impl); |
} |
|
return abstract_font_face; |
} |
|
static cairo_bool_t |
_cairo_font_face_is_toy (cairo_font_face_t *font_face) |
{ |
return font_face->backend == &_cairo_toy_font_face_backend; |
} |
|
/** |
* cairo_toy_font_face_get_family: |
* @font_face: A toy font face |
* |
* Gets the familly name of a toy font. |
* |
* Return value: The family name. This string is owned by the font face |
* and remains valid as long as the font face is alive (referenced). |
* |
* Since: 1.8 |
**/ |
const char * |
cairo_toy_font_face_get_family (cairo_font_face_t *font_face) |
{ |
cairo_toy_font_face_t *toy_font_face; |
|
if (font_face->status) |
return CAIRO_FONT_FAMILY_DEFAULT; |
|
toy_font_face = (cairo_toy_font_face_t *) font_face; |
if (! _cairo_font_face_is_toy (font_face)) { |
if (_cairo_font_face_set_error (font_face, CAIRO_STATUS_FONT_TYPE_MISMATCH)) |
return CAIRO_FONT_FAMILY_DEFAULT; |
} |
assert (toy_font_face->owns_family); |
return toy_font_face->family; |
} |
|
/** |
* cairo_toy_font_face_get_slant: |
* @font_face: A toy font face |
* |
* Gets the slant a toy font. |
* |
* Return value: The slant value |
* |
* Since: 1.8 |
**/ |
cairo_font_slant_t |
cairo_toy_font_face_get_slant (cairo_font_face_t *font_face) |
{ |
cairo_toy_font_face_t *toy_font_face; |
|
if (font_face->status) |
return CAIRO_FONT_SLANT_DEFAULT; |
|
toy_font_face = (cairo_toy_font_face_t *) font_face; |
if (! _cairo_font_face_is_toy (font_face)) { |
if (_cairo_font_face_set_error (font_face, CAIRO_STATUS_FONT_TYPE_MISMATCH)) |
return CAIRO_FONT_SLANT_DEFAULT; |
} |
return toy_font_face->slant; |
} |
slim_hidden_def (cairo_toy_font_face_get_slant); |
|
/** |
* cairo_toy_font_face_get_weight: |
* @font_face: A toy font face |
* |
* Gets the weight a toy font. |
* |
* Return value: The weight value |
* |
* Since: 1.8 |
**/ |
cairo_font_weight_t |
cairo_toy_font_face_get_weight (cairo_font_face_t *font_face) |
{ |
cairo_toy_font_face_t *toy_font_face; |
|
if (font_face->status) |
return CAIRO_FONT_WEIGHT_DEFAULT; |
|
toy_font_face = (cairo_toy_font_face_t *) font_face; |
if (! _cairo_font_face_is_toy (font_face)) { |
if (_cairo_font_face_set_error (font_face, CAIRO_STATUS_FONT_TYPE_MISMATCH)) |
return CAIRO_FONT_WEIGHT_DEFAULT; |
} |
return toy_font_face->weight; |
} |
slim_hidden_def (cairo_toy_font_face_get_weight); |
|
static const cairo_font_face_backend_t _cairo_toy_font_face_backend = { |
CAIRO_FONT_TYPE_TOY, |
NULL, /* create_for_toy */ |
_cairo_toy_font_face_destroy, |
_cairo_toy_font_face_scaled_font_create, |
_cairo_toy_font_face_get_implementation |
}; |
|
void |
_cairo_toy_font_face_reset_static_data (void) |
{ |
cairo_hash_table_t *hash_table; |
|
/* We manually acquire the lock rather than calling |
* cairo_toy_font_face_hash_table_lock simply to avoid |
* creating the table only to destroy it again. */ |
CAIRO_MUTEX_LOCK (_cairo_toy_font_face_mutex); |
hash_table = cairo_toy_font_face_hash_table; |
cairo_toy_font_face_hash_table = NULL; |
CAIRO_MUTEX_UNLOCK (_cairo_toy_font_face_mutex); |
|
if (hash_table != NULL) |
_cairo_hash_table_destroy (hash_table); |
} |