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Diffstat (limited to 'src/3rdparty/harfbuzz-ng/src/hb-ot-shape-complex-private.hh')
| -rw-r--r-- | src/3rdparty/harfbuzz-ng/src/hb-ot-shape-complex-private.hh | 359 |
1 files changed, 359 insertions, 0 deletions
diff --git a/src/3rdparty/harfbuzz-ng/src/hb-ot-shape-complex-private.hh b/src/3rdparty/harfbuzz-ng/src/hb-ot-shape-complex-private.hh new file mode 100644 index 0000000000..a099e05d74 --- /dev/null +++ b/src/3rdparty/harfbuzz-ng/src/hb-ot-shape-complex-private.hh @@ -0,0 +1,359 @@ +/* + * Copyright © 2010,2011,2012 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-shape-private.hh" +#include "hb-ot-shape-normalize-private.hh" + + + +/* buffer var allocations, used by complex shapers */ +#define complex_var_u8_0() var2.u8[2] +#define complex_var_u8_1() var2.u8[3] + + +enum hb_ot_shape_zero_width_marks_type_t { + HB_OT_SHAPE_ZERO_WIDTH_MARKS_NONE, +// HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_UNICODE_EARLY, + HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_UNICODE_LATE, + HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_EARLY, + HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_LATE +}; + + +/* Master OT shaper list */ +#define HB_COMPLEX_SHAPERS_IMPLEMENT_SHAPERS \ + HB_COMPLEX_SHAPER_IMPLEMENT (default) /* should be first */ \ + HB_COMPLEX_SHAPER_IMPLEMENT (arabic) \ + HB_COMPLEX_SHAPER_IMPLEMENT (indic) \ + HB_COMPLEX_SHAPER_IMPLEMENT (myanmar) \ + HB_COMPLEX_SHAPER_IMPLEMENT (sea) \ + HB_COMPLEX_SHAPER_IMPLEMENT (thai) \ + /* ^--- Add new shapers here */ + + +struct hb_ot_complex_shaper_t +{ + char name[8]; + + /* collect_features() + * Called during shape_plan(). + * Shapers should use plan->map to add their features and callbacks. + * May be NULL. + */ + void (*collect_features) (hb_ot_shape_planner_t *plan); + + /* override_features() + * Called during shape_plan(). + * Shapers should use plan->map to override features and add callbacks after + * common features are added. + * May be NULL. + */ + void (*override_features) (hb_ot_shape_planner_t *plan); + + + /* data_create() + * Called at the end of shape_plan(). + * Whatever shapers return will be accessible through plan->data later. + * If NULL is returned, means a plan failure. + */ + void *(*data_create) (const hb_ot_shape_plan_t *plan); + + /* data_destroy() + * Called when the shape_plan is being destroyed. + * plan->data is passed here for destruction. + * If NULL is returned, means a plan failure. + * May be NULL. + */ + void (*data_destroy) (void *data); + + + /* preprocess_text() + * Called during shape(). + * Shapers can use to modify text before shaping starts. + * May be NULL. + */ + void (*preprocess_text) (const hb_ot_shape_plan_t *plan, + hb_buffer_t *buffer, + hb_font_t *font); + + + /* normalization_preference() + * Called during shape(). + * May be NULL. + */ + hb_ot_shape_normalization_mode_t + (*normalization_preference) (const hb_segment_properties_t *props); + + /* decompose() + * Called during shape()'s normalization. + * May be NULL. + */ + bool (*decompose) (const hb_ot_shape_normalize_context_t *c, + hb_codepoint_t ab, + hb_codepoint_t *a, + hb_codepoint_t *b); + + /* compose() + * Called during shape()'s normalization. + * May be NULL. + */ + bool (*compose) (const hb_ot_shape_normalize_context_t *c, + hb_codepoint_t a, + hb_codepoint_t b, + hb_codepoint_t *ab); + + /* setup_masks() + * Called during shape(). + * Shapers should use map to get feature masks and set on buffer. + * Shapers may NOT modify characters. + * May be NULL. + */ + void (*setup_masks) (const hb_ot_shape_plan_t *plan, + hb_buffer_t *buffer, + hb_font_t *font); + + hb_ot_shape_zero_width_marks_type_t zero_width_marks; + + bool fallback_position; +}; + +#define HB_COMPLEX_SHAPER_IMPLEMENT(name) extern HB_INTERNAL const hb_ot_complex_shaper_t _hb_ot_complex_shaper_##name; +HB_COMPLEX_SHAPERS_IMPLEMENT_SHAPERS +#undef HB_COMPLEX_SHAPER_IMPLEMENT + + +static inline const hb_ot_complex_shaper_t * +hb_ot_shape_complex_categorize (const hb_ot_shape_planner_t *planner) +{ + switch ((hb_tag_t) planner->props.script) + { + default: + return &_hb_ot_complex_shaper_default; + + + /* Unicode-1.1 additions */ + case HB_SCRIPT_ARABIC: + + /* Unicode-3.0 additions */ + case HB_SCRIPT_MONGOLIAN: + case HB_SCRIPT_SYRIAC: + + /* Unicode-5.0 additions */ + case HB_SCRIPT_NKO: + case HB_SCRIPT_PHAGS_PA: + + /* Unicode-6.0 additions */ + case HB_SCRIPT_MANDAIC: + + /* For Arabic script, use the Arabic shaper even if no OT script tag was found. + * This is because we do fallback shaping for Arabic script (and not others). */ + if (planner->map.chosen_script[0] != HB_OT_TAG_DEFAULT_SCRIPT || + planner->props.script == HB_SCRIPT_ARABIC) + return &_hb_ot_complex_shaper_arabic; + else + return &_hb_ot_complex_shaper_default; + + + /* Unicode-1.1 additions */ + case HB_SCRIPT_THAI: + case HB_SCRIPT_LAO: + + return &_hb_ot_complex_shaper_thai; + + +#if 0 + /* Note: + * Currently we don't have a separate Hangul shaper. The default shaper handles + * Hangul by enabling jamo features. We may want to implement a separate shaper + * in the future. See this thread for details of what such a shaper would do: + * + * http://lists.freedesktop.org/archives/harfbuzz/2013-April/003070.html + */ + /* Unicode-1.1 additions */ + case HB_SCRIPT_HANGUL: + + return &_hb_ot_complex_shaper_hangul; +#endif + + + /* ^--- Add new shapers here */ + + +#if 0 + /* Note: + * + * These disabled scripts are listed in ucd/IndicSyllabicCategory.txt, but according + * to Martin Hosken and Jonathan Kew do not require complex shaping. + * + * TODO We should automate figuring out which scripts do not need complex shaping + * + * TODO We currently keep data for these scripts in our indic table. Need to fix the + * generator to not do that. + */ + + + /* Simple? */ + + /* Unicode-3.2 additions */ + case HB_SCRIPT_BUHID: + case HB_SCRIPT_HANUNOO: + + /* Unicode-5.1 additions */ + case HB_SCRIPT_SAURASHTRA: + + /* Unicode-6.0 additions */ + case HB_SCRIPT_BATAK: + case HB_SCRIPT_BRAHMI: + + + /* Simple */ + + /* Unicode-1.1 additions */ + /* These have their own shaper now. */ + case HB_SCRIPT_LAO: + case HB_SCRIPT_THAI: + + /* Unicode-2.0 additions */ + case HB_SCRIPT_TIBETAN: + + /* Unicode-3.2 additions */ + case HB_SCRIPT_TAGALOG: + case HB_SCRIPT_TAGBANWA: + + /* Unicode-4.0 additions */ + case HB_SCRIPT_LIMBU: + case HB_SCRIPT_TAI_LE: + + /* Unicode-4.1 additions */ + case HB_SCRIPT_KHAROSHTHI: + case HB_SCRIPT_SYLOTI_NAGRI: + + /* Unicode-5.1 additions */ + case HB_SCRIPT_KAYAH_LI: + + /* Unicode-5.2 additions */ + case HB_SCRIPT_TAI_VIET: + + +#endif + + /* Unicode-1.1 additions */ + case HB_SCRIPT_BENGALI: + case HB_SCRIPT_DEVANAGARI: + case HB_SCRIPT_GUJARATI: + case HB_SCRIPT_GURMUKHI: + case HB_SCRIPT_KANNADA: + case HB_SCRIPT_MALAYALAM: + case HB_SCRIPT_ORIYA: + case HB_SCRIPT_TAMIL: + case HB_SCRIPT_TELUGU: + + /* Unicode-3.0 additions */ + case HB_SCRIPT_SINHALA: + + /* Unicode-4.1 additions */ + case HB_SCRIPT_BUGINESE: + + /* Unicode-5.0 additions */ + case HB_SCRIPT_BALINESE: + + /* Unicode-5.1 additions */ + case HB_SCRIPT_LEPCHA: + case HB_SCRIPT_REJANG: + case HB_SCRIPT_SUNDANESE: + + /* Unicode-5.2 additions */ + case HB_SCRIPT_JAVANESE: + case HB_SCRIPT_KAITHI: + case HB_SCRIPT_MEETEI_MAYEK: + + /* Unicode-6.0 additions */ + + /* Unicode-6.1 additions */ + case HB_SCRIPT_CHAKMA: + case HB_SCRIPT_SHARADA: + case HB_SCRIPT_TAKRI: + + /* If the designer designed the font for the 'DFLT' script, + * use the default shaper. Otherwise, use the Indic shaper. + * Note that for some simple scripts, there may not be *any* + * GSUB/GPOS needed, so there may be no scripts found! */ + if (planner->map.chosen_script[0] == HB_TAG ('D','F','L','T')) + return &_hb_ot_complex_shaper_default; + else + return &_hb_ot_complex_shaper_indic; + + case HB_SCRIPT_KHMER: + /* A number of Khmer fonts in the wild don't have a 'pref' feature, + * and as such won't shape properly via the Indic shaper; + * however, they typically have 'liga' / 'clig' features that implement + * the necessary "reordering" by means of ligature substitutions. + * So we send such pref-less fonts through the generic shaper instead. */ + if (planner->map.found_script[0] && + hb_ot_layout_language_find_feature (planner->face, HB_OT_TAG_GSUB, + planner->map.script_index[0], + planner->map.language_index[0], + HB_TAG ('p','r','e','f'), + NULL)) + return &_hb_ot_complex_shaper_indic; + else + return &_hb_ot_complex_shaper_default; + + case HB_SCRIPT_MYANMAR: + /* For Myanmar, we only want to use the Myanmar shaper if the "new" script + * tag is found. For "old" script tag we want to use the default shaper. */ + if (planner->map.chosen_script[0] == HB_TAG ('m','y','m','2')) + return &_hb_ot_complex_shaper_myanmar; + else + return &_hb_ot_complex_shaper_default; + + /* Unicode-4.1 additions */ + case HB_SCRIPT_NEW_TAI_LUE: + + /* Unicode-5.1 additions */ + case HB_SCRIPT_CHAM: + + /* Unicode-5.2 additions */ + case HB_SCRIPT_TAI_THAM: + + /* If the designer designed the font for the 'DFLT' script, + * use the default shaper. Otherwise, use the Indic shaper. + * Note that for some simple scripts, there may not be *any* + * GSUB/GPOS needed, so there may be no scripts found! */ + if (planner->map.chosen_script[0] == HB_TAG ('D','F','L','T')) + return &_hb_ot_complex_shaper_default; + else + return &_hb_ot_complex_shaper_sea; + } +} + + +#endif /* HB_OT_SHAPE_COMPLEX_PRIVATE_HH */ |