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-/*
- * 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-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_BUGINESE:
- 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 */