HarfBuzz text shaping engine
http://harfbuzz.github.io/
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228 lines
6.8 KiB
228 lines
6.8 KiB
/* |
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* Copyright © 2010,2011 Google, Inc. |
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* |
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* This is part of HarfBuzz, a text shaping library. |
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* |
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* Permission is hereby granted, without written agreement and without |
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* license or royalty fees, to use, copy, modify, and distribute this |
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* software and its documentation for any purpose, provided that the |
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* above copyright notice and the following two paragraphs appear in |
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* all copies of this software. |
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* |
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR |
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES |
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN |
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH |
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* DAMAGE. |
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* |
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, |
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND |
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS |
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO |
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. |
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* |
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* Google Author(s): Behdad Esfahbod |
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*/ |
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#ifndef HB_OT_SHAPE_COMPLEX_PRIVATE_HH |
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#define HB_OT_SHAPE_COMPLEX_PRIVATE_HH |
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#include "hb-private.hh" |
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#include "hb-ot-map-private.hh" |
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/* buffer var allocations, used during the entire shaping process */ |
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#define general_category() var1.u8[0] /* unicode general_category (hb_unicode_general_category_t) */ |
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#define combining_class() var1.u8[1] /* unicode combining_class (uint8_t) */ |
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/* buffer var allocations, used by complex shapers */ |
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#define complex_var_persistent_u8_0() var2.u8[0] |
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#define complex_var_persistent_u8_1() var2.u8[1] |
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#define complex_var_persistent_u16() var2.u16[0] |
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#define complex_var_temporary_u8_0() var2.u8[2] |
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#define complex_var_temporary_u8_1() var2.u8[3] |
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#define complex_var_temporary_u16() var2.u16[1] |
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#define HB_COMPLEX_SHAPERS_IMPLEMENT_SHAPERS \ |
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HB_COMPLEX_SHAPER_IMPLEMENT (default) /* should be first */ \ |
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HB_COMPLEX_SHAPER_IMPLEMENT (arabic) \ |
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HB_COMPLEX_SHAPER_IMPLEMENT (indic) \ |
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/* ^--- Add new shapers here */ |
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enum hb_ot_complex_shaper_t { |
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#define HB_COMPLEX_SHAPER_IMPLEMENT(name) hb_ot_complex_shaper_##name, |
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HB_COMPLEX_SHAPERS_IMPLEMENT_SHAPERS |
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/* Just here to avoid enum trailing comma: */ |
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hb_ot_complex_shaper_generic = hb_ot_complex_shaper_default |
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#undef HB_COMPLEX_SHAPER_IMPLEMENT |
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}; |
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static inline hb_ot_complex_shaper_t |
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hb_ot_shape_complex_categorize (const hb_segment_properties_t *props) |
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{ |
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switch ((int) props->script) |
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{ |
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default: |
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return hb_ot_complex_shaper_default; |
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case HB_SCRIPT_ARABIC: |
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case HB_SCRIPT_MANDAIC: |
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case HB_SCRIPT_MONGOLIAN: |
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case HB_SCRIPT_NKO: |
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case HB_SCRIPT_SYRIAC: |
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return hb_ot_complex_shaper_arabic; |
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#if 0 |
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/* Note: |
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* |
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* These disabled scripts are listed in ucd/IndicSyllabicCategory.txt, but according |
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* to Martin Hosken do not require complex shaping. |
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* |
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* TODO We currently keep data for these scripts in our indic table. Need to fix the |
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* generator to not do that. |
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*/ |
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/* Simple? */ |
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case HB_SCRIPT_BATAK: |
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case HB_SCRIPT_BRAHMI: |
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case HB_SCRIPT_HANUNOO: |
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case HB_SCRIPT_MEETEI_MAYEK: |
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case HB_SCRIPT_SAURASHTRA: |
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/* Simple */ |
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case HB_SCRIPT_KAYAH_LI: |
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case HB_SCRIPT_LAO: |
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case HB_SCRIPT_LIMBU: |
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case HB_SCRIPT_PHAGS_PA: |
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case HB_SCRIPT_SYLOTI_NAGRI: |
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case HB_SCRIPT_TAGALOG: |
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case HB_SCRIPT_TAGBANWA: |
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case HB_SCRIPT_TAI_LE: |
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case HB_SCRIPT_TAI_VIET: |
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case HB_SCRIPT_THAI: |
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case HB_SCRIPT_TIBETAN: |
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/* May need Indic treatment in the future? */ |
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case HB_SCRIPT_MYANMAR: |
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#endif |
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case HB_SCRIPT_BALINESE: |
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case HB_SCRIPT_BENGALI: |
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case HB_SCRIPT_BUGINESE: |
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case HB_SCRIPT_BUHID: |
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case HB_SCRIPT_CHAM: |
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case HB_SCRIPT_DEVANAGARI: |
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case HB_SCRIPT_GUJARATI: |
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case HB_SCRIPT_GURMUKHI: |
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case HB_SCRIPT_JAVANESE: |
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case HB_SCRIPT_KAITHI: |
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case HB_SCRIPT_KANNADA: |
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case HB_SCRIPT_KHAROSHTHI: |
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case HB_SCRIPT_KHMER: |
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case HB_SCRIPT_LEPCHA: |
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case HB_SCRIPT_MALAYALAM: |
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case HB_SCRIPT_NEW_TAI_LUE: |
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case HB_SCRIPT_ORIYA: |
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case HB_SCRIPT_REJANG: |
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case HB_SCRIPT_SINHALA: |
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case HB_SCRIPT_SUNDANESE: |
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case HB_SCRIPT_TAI_THAM: |
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case HB_SCRIPT_TAMIL: |
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case HB_SCRIPT_TELUGU: |
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return hb_ot_complex_shaper_indic; |
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/* ^--- Add new shapers here */ |
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} |
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} |
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/* |
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* collect_features() |
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* |
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* Called during shape_plan(). |
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* |
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* Shapers should use map to add their features and callbacks. |
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*/ |
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typedef void hb_ot_shape_complex_collect_features_func_t (hb_ot_map_builder_t *map, const hb_segment_properties_t *props); |
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#define HB_COMPLEX_SHAPER_IMPLEMENT(name) \ |
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HB_INTERNAL hb_ot_shape_complex_collect_features_func_t _hb_ot_shape_complex_collect_features_##name; |
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HB_COMPLEX_SHAPERS_IMPLEMENT_SHAPERS |
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#undef HB_COMPLEX_SHAPER_IMPLEMENT |
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static inline void |
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hb_ot_shape_complex_collect_features (hb_ot_complex_shaper_t shaper, |
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hb_ot_map_builder_t *map, |
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const hb_segment_properties_t *props) |
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{ |
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switch (shaper) { |
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default: |
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#define HB_COMPLEX_SHAPER_IMPLEMENT(name) \ |
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case hb_ot_complex_shaper_##name: _hb_ot_shape_complex_collect_features_##name (map, props); return; |
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HB_COMPLEX_SHAPERS_IMPLEMENT_SHAPERS |
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#undef HB_COMPLEX_SHAPER_IMPLEMENT |
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} |
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} |
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/* |
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* prefer_decomposed() |
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* |
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* Called during shape_execute(). |
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* |
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* Shapers should return TRUE if it prefers decomposed (NFD) input rather than precomposed (NFC). |
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*/ |
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typedef bool hb_ot_shape_complex_prefer_decomposed_func_t (void); |
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#define HB_COMPLEX_SHAPER_IMPLEMENT(name) \ |
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HB_INTERNAL hb_ot_shape_complex_prefer_decomposed_func_t _hb_ot_shape_complex_prefer_decomposed_##name; |
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HB_COMPLEX_SHAPERS_IMPLEMENT_SHAPERS |
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#undef HB_COMPLEX_SHAPER_IMPLEMENT |
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static inline bool |
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hb_ot_shape_complex_prefer_decomposed (hb_ot_complex_shaper_t shaper) |
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{ |
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switch (shaper) { |
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default: |
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#define HB_COMPLEX_SHAPER_IMPLEMENT(name) \ |
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case hb_ot_complex_shaper_##name: return _hb_ot_shape_complex_prefer_decomposed_##name (); |
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HB_COMPLEX_SHAPERS_IMPLEMENT_SHAPERS |
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#undef HB_COMPLEX_SHAPER_IMPLEMENT |
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} |
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} |
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/* setup_masks() |
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* |
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* Called during shape_execute(). |
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* |
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* Shapers should use map to get feature masks and set on buffer. |
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*/ |
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typedef void hb_ot_shape_complex_setup_masks_func_t (hb_ot_map_t *map, hb_buffer_t *buffer); |
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#define HB_COMPLEX_SHAPER_IMPLEMENT(name) \ |
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HB_INTERNAL hb_ot_shape_complex_setup_masks_func_t _hb_ot_shape_complex_setup_masks_##name; |
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HB_COMPLEX_SHAPERS_IMPLEMENT_SHAPERS |
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#undef HB_COMPLEX_SHAPER_IMPLEMENT |
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static inline void |
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hb_ot_shape_complex_setup_masks (hb_ot_complex_shaper_t shaper, |
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hb_ot_map_t *map, |
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hb_buffer_t *buffer) |
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{ |
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switch (shaper) { |
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default: |
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#define HB_COMPLEX_SHAPER_IMPLEMENT(name) \ |
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case hb_ot_complex_shaper_##name: _hb_ot_shape_complex_setup_masks_##name (map, buffer); return; |
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HB_COMPLEX_SHAPERS_IMPLEMENT_SHAPERS |
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#undef HB_COMPLEX_SHAPER_IMPLEMENT |
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} |
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} |
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#endif /* HB_OT_SHAPE_COMPLEX_PRIVATE_HH */
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