harfbuzz/src/hb-ot-shape-complex-private.hh

216 lines
6.5 KiB
C++

/*
* 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.
*
* Google Author(s): Behdad Esfahbod
*/
#ifndef HB_OT_SHAPE_COMPLEX_PRIVATE_HH
#define HB_OT_SHAPE_COMPLEX_PRIVATE_HH
#include "hb-private.hh"
#include "hb-ot-map-private.hh"
HB_BEGIN_DECLS
/* buffer var allocations, used during the entire shaping process */
#define general_category() var1.u8[0] /* unicode general_category (hb_unicode_general_category_t) */
#define combining_class() var1.u8[1] /* unicode combining_class (uint8_t) */
/* buffer var allocations, used by complex shapers */
#define complex_var_persistent_u8_0() var2.u8[0]
#define complex_var_persistent_u8_1() var2.u8[1]
#define complex_var_persistent_u16() var2.u16[0]
#define complex_var_temporary_u8_0() var2.u8[2]
#define complex_var_temporary_u8_1() var2.u8[3]
#define complex_var_temporary_u16() var2.u16[1]
#define HB_COMPLEX_SHAPERS_IMPLEMENT_SHAPERS \
HB_COMPLEX_SHAPER_IMPLEMENT (default) /* should be first */ \
HB_COMPLEX_SHAPER_IMPLEMENT (arabic) \
HB_COMPLEX_SHAPER_IMPLEMENT (indic) \
/* ^--- Add new shapers here */
enum hb_ot_complex_shaper_t {
#define HB_COMPLEX_SHAPER_IMPLEMENT(name) hb_ot_complex_shaper_##name,
HB_COMPLEX_SHAPERS_IMPLEMENT_SHAPERS
#undef HB_COMPLEX_SHAPER_IMPLEMENT
};
static inline hb_ot_complex_shaper_t
hb_ot_shape_complex_categorize (const hb_segment_properties_t *props)
{
switch ((int) props->script)
{
default:
return hb_ot_complex_shaper_default;
case HB_SCRIPT_ARABIC:
case HB_SCRIPT_MANDAIC:
case HB_SCRIPT_MONGOLIAN:
case HB_SCRIPT_NKO:
case HB_SCRIPT_SYRIAC:
return hb_ot_complex_shaper_arabic;
/* TODO: These are all the scripts that the ucd/IndicSyllabicCategory.txt covers.
* Quite possibly many of these need no shaping, and some other are encoded visually.
* Needs to be refined.
*/
case HB_SCRIPT_BALINESE:
case HB_SCRIPT_BATAK:
case HB_SCRIPT_BENGALI:
case HB_SCRIPT_BRAHMI:
case HB_SCRIPT_BUGINESE:
case HB_SCRIPT_BUHID:
case HB_SCRIPT_CHAM:
case HB_SCRIPT_DEVANAGARI:
case HB_SCRIPT_GUJARATI:
case HB_SCRIPT_GURMUKHI:
case HB_SCRIPT_HANUNOO:
case HB_SCRIPT_JAVANESE:
case HB_SCRIPT_KAITHI:
case HB_SCRIPT_KANNADA:
case HB_SCRIPT_KAYAH_LI:
case HB_SCRIPT_KHAROSHTHI:
case HB_SCRIPT_KHMER:
case HB_SCRIPT_LAO:
case HB_SCRIPT_LEPCHA:
case HB_SCRIPT_LIMBU:
case HB_SCRIPT_MALAYALAM:
case HB_SCRIPT_MEETEI_MAYEK:
case HB_SCRIPT_MYANMAR:
case HB_SCRIPT_NEW_TAI_LUE:
case HB_SCRIPT_ORIYA:
case HB_SCRIPT_PHAGS_PA:
case HB_SCRIPT_REJANG:
case HB_SCRIPT_SAURASHTRA:
case HB_SCRIPT_SINHALA:
case HB_SCRIPT_SUNDANESE:
case HB_SCRIPT_SYLOTI_NAGRI:
case HB_SCRIPT_TAGALOG:
case HB_SCRIPT_TAGBANWA:
case HB_SCRIPT_TAI_LE:
case HB_SCRIPT_TAI_THAM:
case HB_SCRIPT_TAI_VIET:
case HB_SCRIPT_TAMIL:
case HB_SCRIPT_TELUGU:
case HB_SCRIPT_THAI:
case HB_SCRIPT_TIBETAN:
return hb_ot_complex_shaper_indic;
/* ^--- Add new shapers here */
}
}
/*
* collect_features()
*
* Called during shape_plan().
*
* Shapers should use map to add their features and callbacks.
*/
typedef void hb_ot_shape_complex_collect_features_func_t (hb_ot_map_builder_t *map, const hb_segment_properties_t *props);
#define HB_COMPLEX_SHAPER_IMPLEMENT(name) \
HB_INTERNAL hb_ot_shape_complex_collect_features_func_t _hb_ot_shape_complex_collect_features_##name;
HB_COMPLEX_SHAPERS_IMPLEMENT_SHAPERS
#undef HB_COMPLEX_SHAPER_IMPLEMENT
static inline void
hb_ot_shape_complex_collect_features (hb_ot_complex_shaper_t shaper,
hb_ot_map_builder_t *map,
const hb_segment_properties_t *props)
{
switch (shaper) {
default:
#define HB_COMPLEX_SHAPER_IMPLEMENT(name) \
case hb_ot_complex_shaper_##name: _hb_ot_shape_complex_collect_features_##name (map, props); return;
HB_COMPLEX_SHAPERS_IMPLEMENT_SHAPERS
#undef HB_COMPLEX_SHAPER_IMPLEMENT
}
}
/*
* prefer_decomposed()
*
* Called during shape_execute().
*
* Shapers should return TRUE if it prefers decomposed (NFD) input rather than precomposed (NFC).
*/
typedef bool hb_ot_shape_complex_prefer_decomposed_func_t (void);
#define HB_COMPLEX_SHAPER_IMPLEMENT(name) \
HB_INTERNAL hb_ot_shape_complex_prefer_decomposed_func_t _hb_ot_shape_complex_prefer_decomposed_##name;
HB_COMPLEX_SHAPERS_IMPLEMENT_SHAPERS
#undef HB_COMPLEX_SHAPER_IMPLEMENT
static inline bool
hb_ot_shape_complex_prefer_decomposed (hb_ot_complex_shaper_t shaper)
{
switch (shaper) {
default:
#define HB_COMPLEX_SHAPER_IMPLEMENT(name) \
case hb_ot_complex_shaper_##name: return _hb_ot_shape_complex_prefer_decomposed_##name ();
HB_COMPLEX_SHAPERS_IMPLEMENT_SHAPERS
#undef HB_COMPLEX_SHAPER_IMPLEMENT
}
}
/* setup_masks()
*
* Called during shape_execute().
*
* Shapers should use map to get feature masks and set on buffer.
*/
typedef void hb_ot_shape_complex_setup_masks_func_t (hb_ot_map_t *map, hb_buffer_t *buffer);
#define HB_COMPLEX_SHAPER_IMPLEMENT(name) \
HB_INTERNAL hb_ot_shape_complex_setup_masks_func_t _hb_ot_shape_complex_setup_masks_##name;
HB_COMPLEX_SHAPERS_IMPLEMENT_SHAPERS
#undef HB_COMPLEX_SHAPER_IMPLEMENT
static inline void
hb_ot_shape_complex_setup_masks (hb_ot_complex_shaper_t shaper,
hb_ot_map_t *map,
hb_buffer_t *buffer)
{
switch (shaper) {
default:
#define HB_COMPLEX_SHAPER_IMPLEMENT(name) \
case hb_ot_complex_shaper_##name: _hb_ot_shape_complex_setup_masks_##name (map, buffer); return;
HB_COMPLEX_SHAPERS_IMPLEMENT_SHAPERS
#undef HB_COMPLEX_SHAPER_IMPLEMENT
}
}
HB_END_DECLS
#endif /* HB_OT_SHAPE_COMPLEX_PRIVATE_HH */