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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_SHAPER_HH
+#define HB_OT_SHAPER_HH
+
+#include "hb.hh"
+
+#include "hb-ot-layout.hh"
+#include "hb-ot-shape.hh"
+#include "hb-ot-shape-normalize.hh"
+
+
+/* buffer var allocations, used by all OT shapers */
+#define ot_shaper_var_u8_category() var2.u8[2]
+#define ot_shaper_var_u8_auxiliary() var2.u8[3]
+
+
+#define HB_OT_SHAPE_MAX_COMBINING_MARKS 32
+
+enum hb_ot_shape_zero_width_marks_type_t {
+ HB_OT_SHAPE_ZERO_WIDTH_MARKS_NONE,
+ HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_EARLY,
+ HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_LATE
+};
+
+
+/* Master OT shaper list */
+#define HB_OT_SHAPERS_IMPLEMENT_SHAPERS \
+ HB_OT_SHAPER_IMPLEMENT (arabic) \
+ HB_OT_SHAPER_IMPLEMENT (default) \
+ HB_OT_SHAPER_IMPLEMENT (dumber) \
+ HB_OT_SHAPER_IMPLEMENT (hangul) \
+ HB_OT_SHAPER_IMPLEMENT (hebrew) \
+ HB_OT_SHAPER_IMPLEMENT (indic) \
+ HB_OT_SHAPER_IMPLEMENT (khmer) \
+ HB_OT_SHAPER_IMPLEMENT (myanmar) \
+ HB_OT_SHAPER_IMPLEMENT (myanmar_zawgyi) \
+ HB_OT_SHAPER_IMPLEMENT (thai) \
+ HB_OT_SHAPER_IMPLEMENT (use) \
+ /* ^--- Add new shapers here; keep sorted. */
+
+
+struct hb_ot_shaper_t
+{
+ /* 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 nullptr 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 nullptr 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);
+
+ /* postprocess_glyphs()
+ * Called during shape().
+ * Shapers can use to modify glyphs after shaping ends.
+ * May be NULL.
+ */
+ void (*postprocess_glyphs) (const hb_ot_shape_plan_t *plan,
+ hb_buffer_t *buffer,
+ hb_font_t *font);
+
+
+ hb_ot_shape_normalization_mode_t normalization_preference;
+
+ /* 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);
+
+ /* gpos_tag()
+ * If not HB_TAG_NONE, then must match found GPOS script tag for
+ * GPOS to be applied. Otherwise, fallback positioning will be used.
+ */
+ hb_tag_t gpos_tag;
+
+ /* reorder_marks()
+ * Called during shape().
+ * Shapers can use to modify ordering of combining marks.
+ * May be NULL.
+ */
+ void (*reorder_marks) (const hb_ot_shape_plan_t *plan,
+ hb_buffer_t *buffer,
+ unsigned int start,
+ unsigned int end);
+
+ hb_ot_shape_zero_width_marks_type_t zero_width_marks;
+
+ bool fallback_position;
+};
+
+#define HB_OT_SHAPER_IMPLEMENT(name) extern HB_INTERNAL const hb_ot_shaper_t _hb_ot_shaper_##name;
+HB_OT_SHAPERS_IMPLEMENT_SHAPERS
+#undef HB_OT_SHAPER_IMPLEMENT
+
+
+static inline const hb_ot_shaper_t *
+hb_ot_shaper_categorize (const hb_ot_shape_planner_t *planner)
+{
+ switch ((hb_tag_t) planner->props.script)
+ {
+ default:
+ return &_hb_ot_shaper_default;
+
+
+ /* Unicode-1.1 additions */
+ case HB_SCRIPT_ARABIC:
+
+ /* Unicode-3.0 additions */
+ case HB_SCRIPT_SYRIAC:
+
+ /* 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).
+ * But note that Arabic shaping is applicable only to horizontal layout; for
+ * vertical text, just use the generic shaper instead. */
+ if ((planner->map.chosen_script[0] != HB_OT_TAG_DEFAULT_SCRIPT ||
+ planner->props.script == HB_SCRIPT_ARABIC) &&
+ HB_DIRECTION_IS_HORIZONTAL(planner->props.direction))
+ return &_hb_ot_shaper_arabic;
+ else
+ return &_hb_ot_shaper_default;
+
+
+ /* Unicode-1.1 additions */
+ case HB_SCRIPT_THAI:
+ case HB_SCRIPT_LAO:
+
+ return &_hb_ot_shaper_thai;
+
+
+ /* Unicode-1.1 additions */
+ case HB_SCRIPT_HANGUL:
+
+ return &_hb_ot_shaper_hangul;
+
+
+ /* Unicode-1.1 additions */
+ case HB_SCRIPT_HEBREW:
+
+ return &_hb_ot_shaper_hebrew;
+
+
+ /* 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:
+
+ /* If the designer designed the font for the 'DFLT' script,
+ * (or we ended up arbitrarily pick 'latn'), use the default shaper.
+ * Otherwise, use the specific shaper.
+ *
+ * If it's indy3 tag, send to USE. */
+ if (planner->map.chosen_script[0] == HB_TAG ('D','F','L','T') ||
+ planner->map.chosen_script[0] == HB_TAG ('l','a','t','n'))
+ return &_hb_ot_shaper_default;
+ else if ((planner->map.chosen_script[0] & 0x000000FF) == '3')
+ return &_hb_ot_shaper_use;
+ else
+ return &_hb_ot_shaper_indic;
+
+ case HB_SCRIPT_KHMER:
+ return &_hb_ot_shaper_khmer;
+
+ case HB_SCRIPT_MYANMAR:
+ /* If the designer designed the font for the 'DFLT' script,
+ * (or we ended up arbitrarily pick 'latn'), use the default shaper.
+ * Otherwise, use the specific shaper.
+ *
+ * If designer designed for 'mymr' tag, also send to default
+ * shaper. That's tag used from before Myanmar shaping spec
+ * was developed. The shaping spec uses 'mym2' tag. */
+ if (planner->map.chosen_script[0] == HB_TAG ('D','F','L','T') ||
+ planner->map.chosen_script[0] == HB_TAG ('l','a','t','n') ||
+ planner->map.chosen_script[0] == HB_TAG ('m','y','m','r'))
+ return &_hb_ot_shaper_default;
+ else
+ return &_hb_ot_shaper_myanmar;
+
+
+#define HB_SCRIPT_MYANMAR_ZAWGYI ((hb_script_t) HB_TAG ('Q','a','a','g'))
+ case HB_SCRIPT_MYANMAR_ZAWGYI:
+ /* https://github.com/harfbuzz/harfbuzz/issues/1162 */
+
+ return &_hb_ot_shaper_myanmar_zawgyi;
+
+
+ /* Unicode-2.0 additions */
+ case HB_SCRIPT_TIBETAN:
+
+ /* Unicode-3.0 additions */
+ case HB_SCRIPT_MONGOLIAN:
+ case HB_SCRIPT_SINHALA:
+
+ /* Unicode-3.2 additions */
+ case HB_SCRIPT_BUHID:
+ case HB_SCRIPT_HANUNOO:
+ 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_BUGINESE:
+ case HB_SCRIPT_KHAROSHTHI:
+ case HB_SCRIPT_SYLOTI_NAGRI:
+ case HB_SCRIPT_TIFINAGH:
+
+ /* Unicode-5.0 additions */
+ case HB_SCRIPT_BALINESE:
+ case HB_SCRIPT_NKO:
+ case HB_SCRIPT_PHAGS_PA:
+
+ /* Unicode-5.1 additions */
+ case HB_SCRIPT_CHAM:
+ case HB_SCRIPT_KAYAH_LI:
+ case HB_SCRIPT_LEPCHA:
+ case HB_SCRIPT_REJANG:
+ case HB_SCRIPT_SAURASHTRA:
+ case HB_SCRIPT_SUNDANESE:
+
+ /* Unicode-5.2 additions */
+ case HB_SCRIPT_EGYPTIAN_HIEROGLYPHS:
+ case HB_SCRIPT_JAVANESE:
+ case HB_SCRIPT_KAITHI:
+ case HB_SCRIPT_MEETEI_MAYEK:
+ case HB_SCRIPT_TAI_THAM:
+ case HB_SCRIPT_TAI_VIET:
+
+ /* Unicode-6.0 additions */
+ case HB_SCRIPT_BATAK:
+ case HB_SCRIPT_BRAHMI:
+ case HB_SCRIPT_MANDAIC:
+
+ /* Unicode-6.1 additions */
+ case HB_SCRIPT_CHAKMA:
+ case HB_SCRIPT_MIAO:
+ case HB_SCRIPT_SHARADA:
+ case HB_SCRIPT_TAKRI:
+
+ /* Unicode-7.0 additions */
+ case HB_SCRIPT_DUPLOYAN:
+ case HB_SCRIPT_GRANTHA:
+ case HB_SCRIPT_KHOJKI:
+ case HB_SCRIPT_KHUDAWADI:
+ case HB_SCRIPT_MAHAJANI:
+ case HB_SCRIPT_MANICHAEAN:
+ case HB_SCRIPT_MODI:
+ case HB_SCRIPT_PAHAWH_HMONG:
+ case HB_SCRIPT_PSALTER_PAHLAVI:
+ case HB_SCRIPT_SIDDHAM:
+ case HB_SCRIPT_TIRHUTA:
+
+ /* Unicode-8.0 additions */
+ case HB_SCRIPT_AHOM:
+ case HB_SCRIPT_MULTANI:
+
+ /* Unicode-9.0 additions */
+ case HB_SCRIPT_ADLAM:
+ case HB_SCRIPT_BHAIKSUKI:
+ case HB_SCRIPT_MARCHEN:
+ case HB_SCRIPT_NEWA:
+
+ /* Unicode-10.0 additions */
+ case HB_SCRIPT_MASARAM_GONDI:
+ case HB_SCRIPT_SOYOMBO:
+ case HB_SCRIPT_ZANABAZAR_SQUARE:
+
+ /* Unicode-11.0 additions */
+ case HB_SCRIPT_DOGRA:
+ case HB_SCRIPT_GUNJALA_GONDI:
+ case HB_SCRIPT_HANIFI_ROHINGYA:
+ case HB_SCRIPT_MAKASAR:
+ case HB_SCRIPT_MEDEFAIDRIN:
+ case HB_SCRIPT_OLD_SOGDIAN:
+ case HB_SCRIPT_SOGDIAN:
+
+ /* Unicode-12.0 additions */
+ case HB_SCRIPT_ELYMAIC:
+ case HB_SCRIPT_NANDINAGARI:
+ case HB_SCRIPT_NYIAKENG_PUACHUE_HMONG:
+ case HB_SCRIPT_WANCHO:
+
+ /* Unicode-13.0 additions */
+ case HB_SCRIPT_CHORASMIAN:
+ case HB_SCRIPT_DIVES_AKURU:
+ case HB_SCRIPT_KHITAN_SMALL_SCRIPT:
+ case HB_SCRIPT_YEZIDI:
+
+ /* Unicode-14.0 additions */
+ case HB_SCRIPT_CYPRO_MINOAN:
+ case HB_SCRIPT_OLD_UYGHUR:
+ case HB_SCRIPT_TANGSA:
+ case HB_SCRIPT_TOTO:
+ case HB_SCRIPT_VITHKUQI:
+
+ /* If the designer designed the font for the 'DFLT' script,
+ * (or we ended up arbitrarily pick 'latn'), use the default shaper.
+ * Otherwise, use the specific 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') ||
+ planner->map.chosen_script[0] == HB_TAG ('l','a','t','n'))
+ return &_hb_ot_shaper_default;
+ else
+ return &_hb_ot_shaper_use;
+ }
+}
+
+
+#endif /* HB_OT_SHAPER_HH */
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