harfbuzz/src/hb-unicode.cc

274 lines
7.0 KiB
C++

/*
* Copyright © 2009 Red Hat, Inc.
* Copyright © 2011 Codethink Limited
* Copyright © 2010,2011 Google, Inc.
*
* This is part of HarfBuzz, a text shaping library.
*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and its documentation for any purpose, provided that the
* above copyright notice and the following two paragraphs appear in
* all copies of this software.
*
* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*
* Red Hat Author(s): Behdad Esfahbod
* Codethink Author(s): Ryan Lortie
* Google Author(s): Behdad Esfahbod
*/
#include "hb-private.hh"
#include "hb-unicode-private.hh"
/*
* hb_unicode_funcs_t
*/
static unsigned int
hb_unicode_combining_class_nil (hb_unicode_funcs_t *ufuncs HB_UNUSED,
hb_codepoint_t unicode HB_UNUSED,
void *user_data HB_UNUSED)
{
return 0;
}
static unsigned int
hb_unicode_eastasian_width_nil (hb_unicode_funcs_t *ufuncs HB_UNUSED,
hb_codepoint_t unicode HB_UNUSED,
void *user_data HB_UNUSED)
{
return 1;
}
static hb_unicode_general_category_t
hb_unicode_general_category_nil (hb_unicode_funcs_t *ufuncs HB_UNUSED,
hb_codepoint_t unicode HB_UNUSED,
void *user_data HB_UNUSED)
{
return HB_UNICODE_GENERAL_CATEGORY_OTHER_LETTER;
}
static hb_codepoint_t
hb_unicode_mirroring_nil (hb_unicode_funcs_t *ufuncs HB_UNUSED,
hb_codepoint_t unicode HB_UNUSED,
void *user_data HB_UNUSED)
{
return unicode;
}
static hb_script_t
hb_unicode_script_nil (hb_unicode_funcs_t *ufuncs HB_UNUSED,
hb_codepoint_t unicode HB_UNUSED,
void *user_data HB_UNUSED)
{
return HB_SCRIPT_UNKNOWN;
}
static hb_bool_t
hb_unicode_compose_nil (hb_unicode_funcs_t *ufuncs HB_UNUSED,
hb_codepoint_t a HB_UNUSED,
hb_codepoint_t b HB_UNUSED,
hb_codepoint_t *ab HB_UNUSED,
void *user_data HB_UNUSED)
{
/* TODO handle Hangul jamo here? */
return FALSE;
}
static hb_bool_t
hb_unicode_decompose_nil (hb_unicode_funcs_t *ufuncs HB_UNUSED,
hb_codepoint_t ab HB_UNUSED,
hb_codepoint_t *a HB_UNUSED,
hb_codepoint_t *b HB_UNUSED,
void *user_data HB_UNUSED)
{
/* TODO handle Hangul jamo here? */
return FALSE;
}
hb_unicode_funcs_t _hb_unicode_funcs_nil = {
HB_OBJECT_HEADER_STATIC,
NULL, /* parent */
TRUE, /* immutable */
{
#define HB_UNICODE_FUNC_IMPLEMENT(name) hb_unicode_##name##_nil,
HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS
#undef HB_UNICODE_FUNC_IMPLEMENT
}
};
hb_unicode_funcs_t *
hb_unicode_funcs_get_default (void)
{
return &_hb_unicode_funcs_default;
}
hb_unicode_funcs_t *
hb_unicode_funcs_create (hb_unicode_funcs_t *parent)
{
hb_unicode_funcs_t *ufuncs;
if (!(ufuncs = hb_object_create<hb_unicode_funcs_t> ()))
return &_hb_unicode_funcs_nil;
if (!parent)
parent = &_hb_unicode_funcs_nil;
hb_unicode_funcs_make_immutable (parent);
ufuncs->parent = hb_unicode_funcs_reference (parent);
ufuncs->func = parent->func;
/* We can safely copy user_data from parent since we hold a reference
* onto it and it's immutable. We should not copy the destroy notifiers
* though. */
ufuncs->user_data = parent->user_data;
return ufuncs;
}
hb_unicode_funcs_t *
hb_unicode_funcs_get_empty (void)
{
return &_hb_unicode_funcs_nil;
}
hb_unicode_funcs_t *
hb_unicode_funcs_reference (hb_unicode_funcs_t *ufuncs)
{
return hb_object_reference (ufuncs);
}
void
hb_unicode_funcs_destroy (hb_unicode_funcs_t *ufuncs)
{
if (!hb_object_destroy (ufuncs)) return;
#define HB_UNICODE_FUNC_IMPLEMENT(name) \
if (ufuncs->destroy.name) ufuncs->destroy.name (ufuncs->user_data.name);
HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS
#undef HB_UNICODE_FUNC_IMPLEMENT
hb_unicode_funcs_destroy (ufuncs->parent);
free (ufuncs);
}
hb_bool_t
hb_unicode_funcs_set_user_data (hb_unicode_funcs_t *ufuncs,
hb_user_data_key_t *key,
void * data,
hb_destroy_func_t destroy,
hb_bool_t replace)
{
return hb_object_set_user_data (ufuncs, key, data, destroy, replace);
}
void *
hb_unicode_funcs_get_user_data (hb_unicode_funcs_t *ufuncs,
hb_user_data_key_t *key)
{
return hb_object_get_user_data (ufuncs, key);
}
void
hb_unicode_funcs_make_immutable (hb_unicode_funcs_t *ufuncs)
{
if (hb_object_is_inert (ufuncs))
return;
ufuncs->immutable = TRUE;
}
hb_bool_t
hb_unicode_funcs_is_immutable (hb_unicode_funcs_t *ufuncs)
{
return ufuncs->immutable;
}
hb_unicode_funcs_t *
hb_unicode_funcs_get_parent (hb_unicode_funcs_t *ufuncs)
{
return ufuncs->parent ? ufuncs->parent : &_hb_unicode_funcs_nil;
}
#define HB_UNICODE_FUNC_IMPLEMENT(name) \
\
void \
hb_unicode_funcs_set_##name##_func (hb_unicode_funcs_t *ufuncs, \
hb_unicode_##name##_func_t func, \
void *user_data, \
hb_destroy_func_t destroy) \
{ \
if (ufuncs->immutable) \
return; \
\
if (ufuncs->destroy.name) \
ufuncs->destroy.name (ufuncs->user_data.name); \
\
if (func) { \
ufuncs->func.name = func; \
ufuncs->user_data.name = user_data; \
ufuncs->destroy.name = destroy; \
} else { \
ufuncs->func.name = ufuncs->parent->func.name; \
ufuncs->user_data.name = ufuncs->parent->user_data.name; \
ufuncs->destroy.name = NULL; \
} \
}
HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS
#undef HB_UNICODE_FUNC_IMPLEMENT
#define HB_UNICODE_FUNC_IMPLEMENT(return_type, name) \
\
return_type \
hb_unicode_##name (hb_unicode_funcs_t *ufuncs, \
hb_codepoint_t unicode) \
{ \
return ufuncs->func.name (ufuncs, unicode, ufuncs->user_data.name); \
}
HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS_SIMPLE
#undef HB_UNICODE_FUNC_IMPLEMENT
hb_bool_t
hb_unicode_compose (hb_unicode_funcs_t *ufuncs,
hb_codepoint_t a,
hb_codepoint_t b,
hb_codepoint_t *ab)
{
*ab = 0;
return ufuncs->func.compose (ufuncs, a, b, ab, ufuncs->user_data.compose);
}
hb_bool_t
hb_unicode_decompose (hb_unicode_funcs_t *ufuncs,
hb_codepoint_t ab,
hb_codepoint_t *a,
hb_codepoint_t *b)
{
*a = ab; *b = 0;
return ufuncs->func.decompose (ufuncs, ab, a, b, ufuncs->user_data.decompose);
}