harfbuzz/src/hb-unicode-private.hh

157 lines
4.8 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
*/
#ifndef HB_UNICODE_PRIVATE_HH
#define HB_UNICODE_PRIVATE_HH
#include "hb-private.hh"
#include "hb-unicode.h"
#include "hb-object-private.hh"
/*
* hb_unicode_funcs_t
*/
#define HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS \
HB_UNICODE_FUNC_IMPLEMENT (combining_class) \
HB_UNICODE_FUNC_IMPLEMENT (eastasian_width) \
HB_UNICODE_FUNC_IMPLEMENT (general_category) \
HB_UNICODE_FUNC_IMPLEMENT (mirroring) \
HB_UNICODE_FUNC_IMPLEMENT (script) \
HB_UNICODE_FUNC_IMPLEMENT (compose) \
HB_UNICODE_FUNC_IMPLEMENT (decompose) \
/* ^--- Add new callbacks here */
/* Simple callbacks are those taking a hb_codepoint_t and returning a hb_codepoint_t */
#define HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS_SIMPLE \
HB_UNICODE_FUNC_IMPLEMENT (unsigned int, combining_class) \
HB_UNICODE_FUNC_IMPLEMENT (unsigned int, eastasian_width) \
HB_UNICODE_FUNC_IMPLEMENT (hb_unicode_general_category_t, general_category) \
HB_UNICODE_FUNC_IMPLEMENT (hb_codepoint_t, mirroring) \
HB_UNICODE_FUNC_IMPLEMENT (hb_script_t, script) \
/* ^--- Add new simple callbacks here */
struct _hb_unicode_funcs_t {
hb_object_header_t header;
hb_unicode_funcs_t *parent;
bool immutable;
/* Don't access these directly. Call hb_unicode_*() instead. */
struct {
#define HB_UNICODE_FUNC_IMPLEMENT(name) hb_unicode_##name##_func_t name;
HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS
#undef HB_UNICODE_FUNC_IMPLEMENT
} func;
struct {
#define HB_UNICODE_FUNC_IMPLEMENT(name) void *name;
HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS
#undef HB_UNICODE_FUNC_IMPLEMENT
} user_data;
struct {
#define HB_UNICODE_FUNC_IMPLEMENT(name) hb_destroy_func_t name;
HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS
#undef HB_UNICODE_FUNC_IMPLEMENT
} destroy;
};
#ifdef HAVE_GLIB
extern HB_INTERNAL hb_unicode_funcs_t _hb_glib_unicode_funcs;
#define _hb_unicode_funcs_default _hb_glib_unicode_funcs
#elif defined(HAVE_ICU)
extern HB_INTERNAL hb_unicode_funcs_t _hb_icu_unicode_funcs;
#define _hb_unicode_funcs_default _hb_icu_unicode_funcs
#else
extern HB_INTERNAL hb_unicode_funcs_t _hb_unicode_funcs_nil;
#define _hb_unicode_funcs_default _hb_unicode_funcs_nil
#endif
HB_INTERNAL unsigned int
_hb_unicode_modified_combining_class (hb_unicode_funcs_t *ufuncs,
hb_codepoint_t unicode);
static inline hb_bool_t
_hb_unicode_is_variation_selector (hb_codepoint_t unicode)
{
return unlikely ((unicode >= 0x180B && unicode <= 0x180D) || /* MONGOLIAN FREE VARIATION SELECTOR ONE..THREE */
(unicode >= 0xFE00 && unicode <= 0xFE0F) || /* VARIATION SELECTOR-1..16 */
(unicode >= 0xE0100 && unicode <= 0xE01EF)); /* VARIATION SELECTOR-17..256 */
}
/* Zero-Width invisible characters:
*
* 00AD SOFT HYPHEN
* 034F COMBINING GRAPHEME JOINER
*
* 200B ZERO WIDTH SPACE
* 200C ZERO WIDTH NON-JOINER
* 200D ZERO WIDTH JOINER
* 200E LEFT-TO-RIGHT MARK
* 200F RIGHT-TO-LEFT MARK
*
* 2028 LINE SEPARATOR
*
* 202A LEFT-TO-RIGHT EMBEDDING
* 202B RIGHT-TO-LEFT EMBEDDING
* 202C POP DIRECTIONAL FORMATTING
* 202D LEFT-TO-RIGHT OVERRIDE
* 202E RIGHT-TO-LEFT OVERRIDE
*
* 2060 WORD JOINER
* 2061 FUNCTION APPLICATION
* 2062 INVISIBLE TIMES
* 2063 INVISIBLE SEPARATOR
*
* FEFF ZERO WIDTH NO-BREAK SPACE
*/
static inline hb_bool_t
_hb_unicode_is_zero_width (hb_codepoint_t ch)
{
return ((ch & ~0x007F) == 0x2000 && (
(ch >= 0x200B && ch <= 0x200F) ||
(ch >= 0x202A && ch <= 0x202E) ||
(ch >= 0x2060 && ch <= 0x2063) ||
(ch == 0x2028)
)) || unlikely (ch == 0x00AD
|| ch == 0x034F
|| ch == 0xFEFF);
}
#endif /* HB_UNICODE_PRIVATE_HH */