diff options
Diffstat (limited to 'Build/source/libs/harfbuzz/harfbuzz-0.9.22/src/hb-ot-shape-complex-indic.cc')
-rw-r--r-- | Build/source/libs/harfbuzz/harfbuzz-0.9.22/src/hb-ot-shape-complex-indic.cc | 1673 |
1 files changed, 0 insertions, 1673 deletions
diff --git a/Build/source/libs/harfbuzz/harfbuzz-0.9.22/src/hb-ot-shape-complex-indic.cc b/Build/source/libs/harfbuzz/harfbuzz-0.9.22/src/hb-ot-shape-complex-indic.cc deleted file mode 100644 index d3c475b6abb..00000000000 --- a/Build/source/libs/harfbuzz/harfbuzz-0.9.22/src/hb-ot-shape-complex-indic.cc +++ /dev/null @@ -1,1673 +0,0 @@ -/* - * Copyright © 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 - */ - -#include "hb-ot-shape-complex-indic-private.hh" -#include "hb-ot-layout-private.hh" - -/* buffer var allocations */ -#define indic_category() complex_var_u8_0() /* indic_category_t */ -#define indic_position() complex_var_u8_1() /* indic_position_t */ - - -/* - * Indic shaper. - */ - - -#define IN_HALF_BLOCK(u, Base) (((u) & ~0x7F) == (Base)) - -#define IS_DEVA(u) (IN_HALF_BLOCK (u, 0x0900)) -#define IS_BENG(u) (IN_HALF_BLOCK (u, 0x0980)) -#define IS_GURU(u) (IN_HALF_BLOCK (u, 0x0A00)) -#define IS_GUJR(u) (IN_HALF_BLOCK (u, 0x0A80)) -#define IS_ORYA(u) (IN_HALF_BLOCK (u, 0x0B00)) -#define IS_TAML(u) (IN_HALF_BLOCK (u, 0x0B80)) -#define IS_TELU(u) (IN_HALF_BLOCK (u, 0x0C00)) -#define IS_KNDA(u) (IN_HALF_BLOCK (u, 0x0C80)) -#define IS_MLYM(u) (IN_HALF_BLOCK (u, 0x0D00)) -#define IS_SINH(u) (IN_HALF_BLOCK (u, 0x0D80)) -#define IS_KHMR(u) (IN_HALF_BLOCK (u, 0x1780)) - - -#define MATRA_POS_LEFT(u) POS_PRE_M -#define MATRA_POS_RIGHT(u) ( \ - IS_DEVA(u) ? POS_AFTER_SUB : \ - IS_BENG(u) ? POS_AFTER_POST : \ - IS_GURU(u) ? POS_AFTER_POST : \ - IS_GUJR(u) ? POS_AFTER_POST : \ - IS_ORYA(u) ? POS_AFTER_POST : \ - IS_TAML(u) ? POS_AFTER_POST : \ - IS_TELU(u) ? (u <= 0x0C42 ? POS_BEFORE_SUB : POS_AFTER_SUB) : \ - IS_KNDA(u) ? (u < 0x0CC3 || u > 0xCD6 ? POS_BEFORE_SUB : POS_AFTER_SUB) : \ - IS_MLYM(u) ? POS_AFTER_POST : \ - IS_SINH(u) ? POS_AFTER_SUB : \ - IS_KHMR(u) ? POS_AFTER_POST : \ - /*default*/ POS_AFTER_SUB \ - ) -#define MATRA_POS_TOP(u) ( /* BENG and MLYM don't have top matras. */ \ - IS_DEVA(u) ? POS_AFTER_SUB : \ - IS_GURU(u) ? POS_AFTER_POST : /* Deviate from spec */ \ - IS_GUJR(u) ? POS_AFTER_SUB : \ - IS_ORYA(u) ? POS_AFTER_MAIN : \ - IS_TAML(u) ? POS_AFTER_SUB : \ - IS_TELU(u) ? POS_BEFORE_SUB : \ - IS_KNDA(u) ? POS_BEFORE_SUB : \ - IS_SINH(u) ? POS_AFTER_SUB : \ - IS_KHMR(u) ? POS_AFTER_POST : \ - /*default*/ POS_AFTER_SUB \ - ) -#define MATRA_POS_BOTTOM(u) ( \ - IS_DEVA(u) ? POS_AFTER_SUB : \ - IS_BENG(u) ? POS_AFTER_SUB : \ - IS_GURU(u) ? POS_AFTER_POST : \ - IS_GUJR(u) ? POS_AFTER_POST : \ - IS_ORYA(u) ? POS_AFTER_SUB : \ - IS_TAML(u) ? POS_AFTER_POST : \ - IS_TELU(u) ? POS_BEFORE_SUB : \ - IS_KNDA(u) ? POS_BEFORE_SUB : \ - IS_MLYM(u) ? POS_AFTER_POST : \ - IS_SINH(u) ? POS_AFTER_SUB : \ - IS_KHMR(u) ? POS_AFTER_POST : \ - /*default*/ POS_AFTER_SUB \ - ) - -static inline indic_position_t -matra_position (hb_codepoint_t u, indic_position_t side) -{ - switch ((int) side) - { - case POS_PRE_C: return MATRA_POS_LEFT (u); - case POS_POST_C: return MATRA_POS_RIGHT (u); - case POS_ABOVE_C: return MATRA_POS_TOP (u); - case POS_BELOW_C: return MATRA_POS_BOTTOM (u); - }; - return side; -} - -/* XXX - * This is a hack for now. We should move this data into the main Indic table. - * Or completely remove it and just check in the tables. - */ -static const hb_codepoint_t ra_chars[] = { - 0x0930, /* Devanagari */ - 0x09B0, /* Bengali */ - 0x09F0, /* Bengali */ - 0x0A30, /* Gurmukhi */ /* No Reph */ - 0x0AB0, /* Gujarati */ - 0x0B30, /* Oriya */ - 0x0BB0, /* Tamil */ /* No Reph */ - 0x0C30, /* Telugu */ /* Reph formed only with ZWJ */ - 0x0CB0, /* Kannada */ - 0x0D30, /* Malayalam */ /* No Reph, Logical Repha */ - - 0x0DBB, /* Sinhala */ /* Reph formed only with ZWJ */ - - 0x179A, /* Khmer */ /* No Reph, Visual Repha */ -}; - -static inline indic_position_t -consonant_position (hb_codepoint_t u) -{ - if ((u & ~0x007F) == 0x1780) - return POS_BELOW_C; /* In Khmer coeng model, post and below forms should not be reordered. */ - return POS_BASE_C; /* Will recategorize later based on font lookups. */ -} - -static inline bool -is_ra (hb_codepoint_t u) -{ - for (unsigned int i = 0; i < ARRAY_LENGTH (ra_chars); i++) - if (u == ra_chars[i]) - return true; - return false; -} - -static inline bool -is_one_of (const hb_glyph_info_t &info, unsigned int flags) -{ - /* If it ligated, all bets are off. */ - if (is_a_ligature (info)) return false; - return !!(FLAG (info.indic_category()) & flags); -} - -#define JOINER_FLAGS (FLAG (OT_ZWJ) | FLAG (OT_ZWNJ)) -static inline bool -is_joiner (const hb_glyph_info_t &info) -{ - return is_one_of (info, JOINER_FLAGS); -} - -/* Note: - * - * We treat Vowels and placeholders as if they were consonants. This is safe because Vowels - * cannot happen in a consonant syllable. The plus side however is, we can call the - * consonant syllable logic from the vowel syllable function and get it all right! */ -#define CONSONANT_FLAGS (FLAG (OT_C) | FLAG (OT_CM) | FLAG (OT_Ra) | FLAG (OT_V) | FLAG (OT_NBSP) | FLAG (OT_DOTTEDCIRCLE)) -static inline bool -is_consonant (const hb_glyph_info_t &info) -{ - return is_one_of (info, CONSONANT_FLAGS); -} - -#define HALANT_OR_COENG_FLAGS (FLAG (OT_H) | FLAG (OT_Coeng)) -static inline bool -is_halant_or_coeng (const hb_glyph_info_t &info) -{ - return is_one_of (info, HALANT_OR_COENG_FLAGS); -} - -static inline void -set_indic_properties (hb_glyph_info_t &info) -{ - hb_codepoint_t u = info.codepoint; - unsigned int type = hb_indic_get_categories (u); - indic_category_t cat = (indic_category_t) (type & 0x7F); - indic_position_t pos = (indic_position_t) (type >> 8); - - - /* - * Re-assign category - */ - - - /* The spec says U+0952 is OT_A. However, testing shows that Uniscribe - * treats U+0951..U+0952 all as OT_VD. - * TESTS: - * U+092E,U+0947,U+0952 - * U+092E,U+0952,U+0947 - * U+092E,U+0947,U+0951 - * U+092E,U+0951,U+0947 - * */ - if (unlikely (hb_in_range<hb_codepoint_t> (u, 0x0951, 0x0954))) - cat = OT_VD; - - if (unlikely (u == 0x17D1)) - cat = OT_X; - if (cat == OT_X && - unlikely (hb_in_range<hb_codepoint_t> (u, 0x17CB, 0x17D3))) /* Khmer Various signs */ - { - /* These are like Top Matras. */ - cat = OT_M; - pos = POS_ABOVE_C; - } - if (u == 0x17C6) /* Khmer Bindu doesn't like to be repositioned. */ - cat = OT_N; - - if (unlikely (u == 0x17D2)) cat = OT_Coeng; /* Khmer coeng */ - else if (unlikely (u == 0x200C)) cat = OT_ZWNJ; - else if (unlikely (u == 0x200D)) cat = OT_ZWJ; - else if (unlikely (u == 0x25CC)) cat = OT_DOTTEDCIRCLE; - else if (unlikely (u == 0x0A71)) cat = OT_SM; /* GURMUKHI ADDAK. More like consonant medial. like 0A75. */ - - if (cat == OT_Repha) { - /* There are two kinds of characters marked as Repha: - * - The ones that are GenCat=Mn are already positioned visually, ie. after base. (eg. Khmer) - * - The ones that are GenCat=Lo is encoded logically, ie. beginning of syllable. (eg. Malayalam) - * - * We recategorize the first kind to look like a Nukta and attached to the base directly. - */ - if (_hb_glyph_info_get_general_category (&info) == HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK) - cat = OT_N; - } - - - - /* - * Re-assign position. - */ - - if ((FLAG (cat) & CONSONANT_FLAGS)) - { - pos = consonant_position (u); - if (is_ra (u)) - cat = OT_Ra; - } - else if (cat == OT_M) - { - pos = matra_position (u, pos); - } - else if (cat == OT_SM || cat == OT_VD) - { - pos = POS_SMVD; - } - - if (unlikely (u == 0x0B01)) pos = POS_BEFORE_SUB; /* Oriya Bindu is BeforeSub in the spec. */ - - - - info.indic_category() = cat; - info.indic_position() = pos; -} - -/* - * Things above this line should ideally be moved to the Indic table itself. - */ - - -/* - * Indic configurations. Note that we do not want to keep every single script-specific - * behavior in these tables necessarily. This should mainly be used for per-script - * properties that are cheaper keeping here, than in the code. Ie. if, say, one and - * only one script has an exception, that one script can be if'ed directly in the code, - * instead of adding a new flag in these structs. - */ - -enum base_position_t { - BASE_POS_FIRST, - BASE_POS_LAST -}; -enum reph_position_t { - REPH_POS_DEFAULT = POS_BEFORE_POST, - - REPH_POS_AFTER_MAIN = POS_AFTER_MAIN, - REPH_POS_BEFORE_SUB = POS_BEFORE_SUB, - REPH_POS_AFTER_SUB = POS_AFTER_SUB, - REPH_POS_BEFORE_POST = POS_BEFORE_POST, - REPH_POS_AFTER_POST = POS_AFTER_POST -}; -enum reph_mode_t { - REPH_MODE_IMPLICIT, /* Reph formed out of initial Ra,H sequence. */ - REPH_MODE_EXPLICIT, /* Reph formed out of initial Ra,H,ZWJ sequence. */ - REPH_MODE_VIS_REPHA, /* Encoded Repha character, no reordering needed. */ - REPH_MODE_LOG_REPHA /* Encoded Repha character, needs reordering. */ -}; -struct indic_config_t -{ - hb_script_t script; - bool has_old_spec; - hb_codepoint_t virama; - base_position_t base_pos; - reph_position_t reph_pos; - reph_mode_t reph_mode; -}; - -static const indic_config_t indic_configs[] = -{ - /* Default. Should be first. */ - {HB_SCRIPT_INVALID, false, 0,BASE_POS_LAST, REPH_POS_DEFAULT, REPH_MODE_IMPLICIT}, - {HB_SCRIPT_DEVANAGARI,true, 0x094D,BASE_POS_LAST, REPH_POS_BEFORE_POST,REPH_MODE_IMPLICIT}, - {HB_SCRIPT_BENGALI, true, 0x09CD,BASE_POS_LAST, REPH_POS_AFTER_SUB, REPH_MODE_IMPLICIT}, - {HB_SCRIPT_GURMUKHI, true, 0x0A4D,BASE_POS_LAST, REPH_POS_BEFORE_SUB, REPH_MODE_IMPLICIT}, - {HB_SCRIPT_GUJARATI, true, 0x0ACD,BASE_POS_LAST, REPH_POS_BEFORE_POST,REPH_MODE_IMPLICIT}, - {HB_SCRIPT_ORIYA, true, 0x0B4D,BASE_POS_LAST, REPH_POS_AFTER_MAIN, REPH_MODE_IMPLICIT}, - {HB_SCRIPT_TAMIL, true, 0x0BCD,BASE_POS_LAST, REPH_POS_AFTER_POST, REPH_MODE_IMPLICIT}, - {HB_SCRIPT_TELUGU, true, 0x0C4D,BASE_POS_LAST, REPH_POS_AFTER_POST, REPH_MODE_EXPLICIT}, - {HB_SCRIPT_KANNADA, true, 0x0CCD,BASE_POS_LAST, REPH_POS_AFTER_POST, REPH_MODE_IMPLICIT}, - {HB_SCRIPT_MALAYALAM, true, 0x0D4D,BASE_POS_LAST, REPH_POS_AFTER_MAIN, REPH_MODE_LOG_REPHA}, - {HB_SCRIPT_SINHALA, false,0x0DCA,BASE_POS_FIRST,REPH_POS_AFTER_MAIN, REPH_MODE_EXPLICIT}, - {HB_SCRIPT_KHMER, false,0x17D2,BASE_POS_FIRST,REPH_POS_DEFAULT, REPH_MODE_VIS_REPHA}, - {HB_SCRIPT_JAVANESE, false,0xA9C0,BASE_POS_LAST, REPH_POS_DEFAULT, REPH_MODE_IMPLICIT}, -}; - - - -/* - * Indic shaper. - */ - -struct feature_list_t { - hb_tag_t tag; - hb_ot_map_feature_flags_t flags; -}; - -static const feature_list_t -indic_features[] = -{ - /* - * Basic features. - * These features are applied in order, one at a time, after initial_reordering. - */ - {HB_TAG('n','u','k','t'), F_GLOBAL}, - {HB_TAG('a','k','h','n'), F_GLOBAL}, - {HB_TAG('r','p','h','f'), F_NONE}, - {HB_TAG('r','k','r','f'), F_GLOBAL}, - {HB_TAG('p','r','e','f'), F_NONE}, - {HB_TAG('b','l','w','f'), F_NONE}, - {HB_TAG('h','a','l','f'), F_NONE}, - {HB_TAG('a','b','v','f'), F_NONE}, - {HB_TAG('p','s','t','f'), F_NONE}, - {HB_TAG('c','f','a','r'), F_NONE}, - {HB_TAG('v','a','t','u'), F_GLOBAL}, - {HB_TAG('c','j','c','t'), F_GLOBAL}, - /* - * Other features. - * These features are applied all at once, after final_reordering. - */ - {HB_TAG('i','n','i','t'), F_NONE}, - {HB_TAG('p','r','e','s'), F_GLOBAL}, - {HB_TAG('a','b','v','s'), F_GLOBAL}, - {HB_TAG('b','l','w','s'), F_GLOBAL}, - {HB_TAG('p','s','t','s'), F_GLOBAL}, - {HB_TAG('h','a','l','n'), F_GLOBAL}, - /* Positioning features, though we don't care about the types. */ - {HB_TAG('d','i','s','t'), F_GLOBAL}, - {HB_TAG('a','b','v','m'), F_GLOBAL}, - {HB_TAG('b','l','w','m'), F_GLOBAL}, -}; - -/* - * Must be in the same order as the indic_features array. - */ -enum { - _NUKT, - _AKHN, - RPHF, - _RKRF, - PREF, - BLWF, - HALF, - ABVF, - PSTF, - CFAR, - _VATU, - _CJCT, - - INIT, - _PRES, - _ABVS, - _BLWS, - _PSTS, - _HALN, - _DIST, - _ABVM, - _BLWM, - - INDIC_NUM_FEATURES, - INDIC_BASIC_FEATURES = INIT /* Don't forget to update this! */ -}; - -static void -setup_syllables (const hb_ot_shape_plan_t *plan, - hb_font_t *font, - hb_buffer_t *buffer); -static void -initial_reordering (const hb_ot_shape_plan_t *plan, - hb_font_t *font, - hb_buffer_t *buffer); -static void -final_reordering (const hb_ot_shape_plan_t *plan, - hb_font_t *font, - hb_buffer_t *buffer); - -static void -collect_features_indic (hb_ot_shape_planner_t *plan) -{ - hb_ot_map_builder_t *map = &plan->map; - - /* Do this before any lookups have been applied. */ - map->add_gsub_pause (setup_syllables); - - map->add_global_bool_feature (HB_TAG('l','o','c','l')); - /* The Indic specs do not require ccmp, but we apply it here since if - * there is a use of it, it's typically at the beginning. */ - map->add_global_bool_feature (HB_TAG('c','c','m','p')); - - - unsigned int i = 0; - map->add_gsub_pause (initial_reordering); - for (; i < INDIC_BASIC_FEATURES; i++) { - map->add_feature (indic_features[i].tag, 1, indic_features[i].flags | F_MANUAL_ZWJ); - map->add_gsub_pause (NULL); - } - map->add_gsub_pause (final_reordering); - for (; i < INDIC_NUM_FEATURES; i++) { - map->add_feature (indic_features[i].tag, 1, indic_features[i].flags | F_MANUAL_ZWJ); - } -} - -static void -override_features_indic (hb_ot_shape_planner_t *plan) -{ - /* Uniscribe does not apply 'kern'. */ - if (hb_options ().uniscribe_bug_compatible) - plan->map.add_feature (HB_TAG('k','e','r','n'), 0, F_GLOBAL); - - plan->map.add_feature (HB_TAG('l','i','g','a'), 0, F_GLOBAL); -} - - -struct would_substitute_feature_t -{ - inline void init (const hb_ot_map_t *map, hb_tag_t feature_tag) - { - map->get_stage_lookups (0/*GSUB*/, - map->get_feature_stage (0/*GSUB*/, feature_tag), - &lookups, &count); - } - - inline bool would_substitute (const hb_codepoint_t *glyphs, - unsigned int glyphs_count, - bool zero_context, - hb_face_t *face) const - { - for (unsigned int i = 0; i < count; i++) - if (hb_ot_layout_lookup_would_substitute_fast (face, lookups[i].index, glyphs, glyphs_count, zero_context)) - return true; - return false; - } - - private: - const hb_ot_map_t::lookup_map_t *lookups; - unsigned int count; -}; - -struct indic_shape_plan_t -{ - ASSERT_POD (); - - inline bool get_virama_glyph (hb_font_t *font, hb_codepoint_t *pglyph) const - { - hb_codepoint_t glyph = virama_glyph; - if (unlikely (virama_glyph == (hb_codepoint_t) -1)) - { - if (!config->virama || !font->get_glyph (config->virama, 0, &glyph)) - glyph = 0; - /* Technically speaking, the spec says we should apply 'locl' to virama too. - * Maybe one day... */ - - /* Our get_glyph() function needs a font, so we can't get the virama glyph - * during shape planning... Instead, overwrite it here. It's safe. Don't worry! */ - (const_cast<indic_shape_plan_t *> (this))->virama_glyph = glyph; - } - - *pglyph = glyph; - return glyph != 0; - } - - const indic_config_t *config; - - bool is_old_spec; - hb_codepoint_t virama_glyph; - - would_substitute_feature_t rphf; - would_substitute_feature_t pref; - would_substitute_feature_t blwf; - would_substitute_feature_t pstf; - - hb_mask_t mask_array[INDIC_NUM_FEATURES]; -}; - -static void * -data_create_indic (const hb_ot_shape_plan_t *plan) -{ - indic_shape_plan_t *indic_plan = (indic_shape_plan_t *) calloc (1, sizeof (indic_shape_plan_t)); - if (unlikely (!indic_plan)) - return NULL; - - indic_plan->config = &indic_configs[0]; - for (unsigned int i = 1; i < ARRAY_LENGTH (indic_configs); i++) - if (plan->props.script == indic_configs[i].script) { - indic_plan->config = &indic_configs[i]; - break; - } - - indic_plan->is_old_spec = indic_plan->config->has_old_spec && ((plan->map.chosen_script[0] & 0x000000FF) != '2'); - indic_plan->virama_glyph = (hb_codepoint_t) -1; - - indic_plan->rphf.init (&plan->map, HB_TAG('r','p','h','f')); - indic_plan->pref.init (&plan->map, HB_TAG('p','r','e','f')); - indic_plan->blwf.init (&plan->map, HB_TAG('b','l','w','f')); - indic_plan->pstf.init (&plan->map, HB_TAG('p','s','t','f')); - - for (unsigned int i = 0; i < ARRAY_LENGTH (indic_plan->mask_array); i++) - indic_plan->mask_array[i] = (indic_features[i].flags & F_GLOBAL) ? - 0 : plan->map.get_1_mask (indic_features[i].tag); - - return indic_plan; -} - -static void -data_destroy_indic (void *data) -{ - free (data); -} - -static indic_position_t -consonant_position_from_face (const indic_shape_plan_t *indic_plan, - const hb_codepoint_t glyphs[2], - hb_face_t *face) -{ - /* For old-spec, the order of glyphs is Consonant,Virama, - * whereas for new-spec, it's Virama,Consonant. However, - * some broken fonts (like Free Sans) simply copied lookups - * from old-spec to new-spec without modification. - * And oddly enough, Uniscribe seems to respect those lookups. - * Eg. in the sequence U+0924,U+094D,U+0930, Uniscribe finds - * base at 0. The font however, only has lookups matching - * 930,94D in 'blwf', not the expected 94D,930 (with new-spec - * table). As such, we simply match both sequences. Seems - * to work. */ - bool zero_context = indic_plan->is_old_spec ? false : true; - hb_codepoint_t glyphs_r[2] = {glyphs[1], glyphs[0]}; - if (indic_plan->pref.would_substitute (glyphs , 2, zero_context, face) || - indic_plan->pref.would_substitute (glyphs_r, 2, zero_context, face)) - return POS_POST_C; - if (indic_plan->blwf.would_substitute (glyphs , 2, zero_context, face) || - indic_plan->blwf.would_substitute (glyphs_r, 2, zero_context, face)) - return POS_BELOW_C; - if (indic_plan->pstf.would_substitute (glyphs , 2, zero_context, face) || - indic_plan->pstf.would_substitute (glyphs_r, 2, zero_context, face)) - return POS_POST_C; - return POS_BASE_C; -} - - -enum syllable_type_t { - consonant_syllable, - vowel_syllable, - standalone_cluster, - broken_cluster, - non_indic_cluster, -}; - -#include "hb-ot-shape-complex-indic-machine.hh" - - -static void -setup_masks_indic (const hb_ot_shape_plan_t *plan HB_UNUSED, - hb_buffer_t *buffer, - hb_font_t *font HB_UNUSED) -{ - HB_BUFFER_ALLOCATE_VAR (buffer, indic_category); - HB_BUFFER_ALLOCATE_VAR (buffer, indic_position); - - /* We cannot setup masks here. We save information about characters - * and setup masks later on in a pause-callback. */ - - unsigned int count = buffer->len; - for (unsigned int i = 0; i < count; i++) - set_indic_properties (buffer->info[i]); -} - -static void -setup_syllables (const hb_ot_shape_plan_t *plan HB_UNUSED, - hb_font_t *font HB_UNUSED, - hb_buffer_t *buffer) -{ - find_syllables (buffer); -} - -static int -compare_indic_order (const hb_glyph_info_t *pa, const hb_glyph_info_t *pb) -{ - int a = pa->indic_position(); - int b = pb->indic_position(); - - return a < b ? -1 : a == b ? 0 : +1; -} - - - -static void -update_consonant_positions (const hb_ot_shape_plan_t *plan, - hb_font_t *font, - hb_buffer_t *buffer) -{ - const indic_shape_plan_t *indic_plan = (const indic_shape_plan_t *) plan->data; - - hb_codepoint_t glyphs[2]; - if (indic_plan->get_virama_glyph (font, &glyphs[0])) - { - hb_face_t *face = font->face; - unsigned int count = buffer->len; - for (unsigned int i = 0; i < count; i++) - if (buffer->info[i].indic_position() == POS_BASE_C) { - glyphs[1] = buffer->info[i].codepoint; - buffer->info[i].indic_position() = consonant_position_from_face (indic_plan, glyphs, face); - } - } -} - - -/* Rules from: - * https://www.microsoft.com/typography/otfntdev/devanot/shaping.aspx */ - -static void -initial_reordering_consonant_syllable (const hb_ot_shape_plan_t *plan, - hb_face_t *face, - hb_buffer_t *buffer, - unsigned int start, unsigned int end) -{ - const indic_shape_plan_t *indic_plan = (const indic_shape_plan_t *) plan->data; - hb_glyph_info_t *info = buffer->info; - - - /* 1. Find base consonant: - * - * The shaping engine finds the base consonant of the syllable, using the - * following algorithm: starting from the end of the syllable, move backwards - * until a consonant is found that does not have a below-base or post-base - * form (post-base forms have to follow below-base forms), or that is not a - * pre-base reordering Ra, or arrive at the first consonant. The consonant - * stopped at will be the base. - * - * o If the syllable starts with Ra + Halant (in a script that has Reph) - * and has more than one consonant, Ra is excluded from candidates for - * base consonants. - */ - - unsigned int base = end; - bool has_reph = false; - - { - /* -> If the syllable starts with Ra + Halant (in a script that has Reph) - * and has more than one consonant, Ra is excluded from candidates for - * base consonants. */ - unsigned int limit = start; - if (indic_plan->mask_array[RPHF] && - start + 3 <= end && - ( - (indic_plan->config->reph_mode == REPH_MODE_IMPLICIT && !is_joiner (info[start + 2])) || - (indic_plan->config->reph_mode == REPH_MODE_EXPLICIT && info[start + 2].indic_category() == OT_ZWJ) - )) - { - /* See if it matches the 'rphf' feature. */ - hb_codepoint_t glyphs[2] = {info[start].codepoint, info[start + 1].codepoint}; - if (indic_plan->rphf.would_substitute (glyphs, ARRAY_LENGTH (glyphs), true, face)) - { - limit += 2; - while (limit < end && is_joiner (info[limit])) - limit++; - base = start; - has_reph = true; - } - } else if (indic_plan->config->reph_mode == REPH_MODE_LOG_REPHA && info[start].indic_category() == OT_Repha) - { - limit += 1; - while (limit < end && is_joiner (info[limit])) - limit++; - base = start; - has_reph = true; - } - - switch (indic_plan->config->base_pos) - { - default: - assert (false); - /* fallthrough */ - - case BASE_POS_LAST: - { - /* -> starting from the end of the syllable, move backwards */ - unsigned int i = end; - bool seen_below = false; - do { - i--; - /* -> until a consonant is found */ - if (is_consonant (info[i])) - { - /* -> that does not have a below-base or post-base form - * (post-base forms have to follow below-base forms), */ - if (info[i].indic_position() != POS_BELOW_C && - (info[i].indic_position() != POS_POST_C || seen_below)) - { - base = i; - break; - } - if (info[i].indic_position() == POS_BELOW_C) - seen_below = true; - - /* -> or that is not a pre-base reordering Ra, - * - * IMPLEMENTATION NOTES: - * - * Our pre-base reordering Ra's are marked POS_POST_C, so will be skipped - * by the logic above already. - */ - - /* -> or arrive at the first consonant. The consonant stopped at will - * be the base. */ - base = i; - } - else - { - /* A ZWJ after a Halant stops the base search, and requests an explicit - * half form. - * A ZWJ before a Halant, requests a subjoined form instead, and hence - * search continues. This is particularly important for Bengali - * sequence Ra,H,Ya that should form Ya-Phalaa by subjoining Ya. */ - if (start < i && - info[i].indic_category() == OT_ZWJ && - info[i - 1].indic_category() == OT_H) - break; - } - } while (i > limit); - } - break; - - case BASE_POS_FIRST: - { - /* In scripts without half forms (eg. Khmer), the first consonant is always the base. */ - - if (!has_reph) - base = limit; - - /* Find the last base consonant that is not blocked by ZWJ. If there is - * a ZWJ right before a base consonant, that would request a subjoined form. */ - for (unsigned int i = limit; i < end; i++) - if (is_consonant (info[i]) && info[i].indic_position() == POS_BASE_C) - { - if (limit < i && info[i - 1].indic_category() == OT_ZWJ) - break; - else - base = i; - } - - /* Mark all subsequent consonants as below. */ - for (unsigned int i = base + 1; i < end; i++) - if (is_consonant (info[i]) && info[i].indic_position() == POS_BASE_C) - info[i].indic_position() = POS_BELOW_C; - } - break; - } - - /* -> If the syllable starts with Ra + Halant (in a script that has Reph) - * and has more than one consonant, Ra is excluded from candidates for - * base consonants. - * - * Only do this for unforced Reph. (ie. not for Ra,H,ZWJ. */ - if (has_reph && base == start && limit - base <= 2) { - /* Have no other consonant, so Reph is not formed and Ra becomes base. */ - has_reph = false; - } - } - - - /* 2. Decompose and reorder Matras: - * - * Each matra and any syllable modifier sign in the cluster are moved to the - * appropriate position relative to the consonant(s) in the cluster. The - * shaping engine decomposes two- or three-part matras into their constituent - * parts before any repositioning. Matra characters are classified by which - * consonant in a conjunct they have affinity for and are reordered to the - * following positions: - * - * o Before first half form in the syllable - * o After subjoined consonants - * o After post-form consonant - * o After main consonant (for above marks) - * - * IMPLEMENTATION NOTES: - * - * The normalize() routine has already decomposed matras for us, so we don't - * need to worry about that. - */ - - - /* 3. Reorder marks to canonical order: - * - * Adjacent nukta and halant or nukta and vedic sign are always repositioned - * if necessary, so that the nukta is first. - * - * IMPLEMENTATION NOTES: - * - * We don't need to do this: the normalize() routine already did this for us. - */ - - - /* Reorder characters */ - - for (unsigned int i = start; i < base; i++) - info[i].indic_position() = MIN (POS_PRE_C, (indic_position_t) info[i].indic_position()); - - if (base < end) - info[base].indic_position() = POS_BASE_C; - - /* Mark final consonants. A final consonant is one appearing after a matra, - * like in Khmer. */ - for (unsigned int i = base + 1; i < end; i++) - if (info[i].indic_category() == OT_M) { - for (unsigned int j = i + 1; j < end; j++) - if (is_consonant (info[j])) { - info[j].indic_position() = POS_FINAL_C; - break; - } - break; - } - - /* Handle beginning Ra */ - if (has_reph) - info[start].indic_position() = POS_RA_TO_BECOME_REPH; - - /* For old-style Indic script tags, move the first post-base Halant after - * last consonant. Only do this if there is *not* a Halant after last - * consonant. Otherwise it becomes messy. */ - if (indic_plan->is_old_spec) { - for (unsigned int i = base + 1; i < end; i++) - if (info[i].indic_category() == OT_H) { - unsigned int j; - for (j = end - 1; j > i; j--) - if (is_consonant (info[j]) || info[j].indic_category() == OT_H) - break; - if (info[j].indic_category() != OT_H && j > i) { - /* Move Halant to after last consonant. */ - hb_glyph_info_t t = info[i]; - memmove (&info[i], &info[i + 1], (j - i) * sizeof (info[0])); - info[j] = t; - } - break; - } - } - - /* Attach misc marks to previous char to move with them. */ - { - indic_position_t last_pos = POS_START; - for (unsigned int i = start; i < end; i++) - { - if ((FLAG (info[i].indic_category()) & (JOINER_FLAGS | FLAG (OT_N) | FLAG (OT_RS) | HALANT_OR_COENG_FLAGS))) - { - info[i].indic_position() = last_pos; - if (unlikely (info[i].indic_category() == OT_H && - info[i].indic_position() == POS_PRE_M)) - { - /* - * Uniscribe doesn't move the Halant with Left Matra. - * TEST: U+092B,U+093F,U+094DE - * We follow. This is important for the Sinhala - * U+0DDA split matra since it decomposes to U+0DD9,U+0DCA - * where U+0DD9 is a left matra and U+0DCA is the virama. - * We don't want to move the virama with the left matra. - * TEST: U+0D9A,U+0DDA - */ - for (unsigned int j = i; j > start; j--) - if (info[j - 1].indic_position() != POS_PRE_M) { - info[i].indic_position() = info[j - 1].indic_position(); - break; - } - } - } else if (info[i].indic_position() != POS_SMVD) { - last_pos = (indic_position_t) info[i].indic_position(); - } - } - } - /* Re-attach ZWJ, ZWNJ, and halant to next char, for after-base consonants. */ - { - unsigned int last_halant = end; - for (unsigned int i = base + 1; i < end; i++) - if (is_halant_or_coeng (info[i])) - last_halant = i; - else if (is_consonant (info[i])) { - for (unsigned int j = last_halant; j < i; j++) - if (info[j].indic_position() != POS_SMVD) - info[j].indic_position() = info[i].indic_position(); - } - } - - { - /* Things are out-of-control for post base positions, they may shuffle - * around like crazy, so merge clusters. For pre-base stuff, we handle - * cluster issues in final reordering. */ - buffer->merge_clusters (base, end); - /* Sit tight, rock 'n roll! */ - hb_bubble_sort (info + start, end - start, compare_indic_order); - /* Find base again */ - base = end; - for (unsigned int i = start; i < end; i++) - if (info[i].indic_position() == POS_BASE_C) { - base = i; - break; - } - } - - /* Setup masks now */ - - { - hb_mask_t mask; - - /* Reph */ - for (unsigned int i = start; i < end && info[i].indic_position() == POS_RA_TO_BECOME_REPH; i++) - info[i].mask |= indic_plan->mask_array[RPHF]; - - /* Pre-base */ - mask = indic_plan->mask_array[HALF]; - for (unsigned int i = start; i < base; i++) - info[i].mask |= mask; - /* Base */ - mask = 0; - if (base < end) - info[base].mask |= mask; - /* Post-base */ - mask = indic_plan->mask_array[BLWF] | indic_plan->mask_array[ABVF] | indic_plan->mask_array[PSTF]; - for (unsigned int i = base + 1; i < end; i++) - info[i].mask |= mask; - } - - if (indic_plan->is_old_spec && - buffer->props.script == HB_SCRIPT_DEVANAGARI) - { - /* Old-spec eye-lash Ra needs special handling. From the - * spec: - * - * "The feature 'below-base form' is applied to consonants - * having below-base forms and following the base consonant. - * The exception is vattu, which may appear below half forms - * as well as below the base glyph. The feature 'below-base - * form' will be applied to all such occurrences of Ra as well." - * - * Test case: U+0924,U+094D,U+0930,U+094d,U+0915 - * with Sanskrit 2003 font. - * - * However, note that Ra,Halant,ZWJ is the correct way to - * request eyelash form of Ra, so we wouldbn't inhibit it - * in that sequence. - * - * Test case: U+0924,U+094D,U+0930,U+094d,U+200D,U+0915 - */ - for (unsigned int i = start; i + 1 < base; i++) - if (info[i ].indic_category() == OT_Ra && - info[i+1].indic_category() == OT_H && - (i + 2 == base || - info[i+2].indic_category() != OT_ZWJ)) - { - info[i ].mask |= indic_plan->mask_array[BLWF]; - info[i+1].mask |= indic_plan->mask_array[BLWF]; - } - } - - if (indic_plan->mask_array[PREF] && base + 2 < end) - { - /* Find a Halant,Ra sequence and mark it for pre-base reordering processing. */ - for (unsigned int i = base + 1; i + 1 < end; i++) { - hb_codepoint_t glyphs[2] = {info[i].codepoint, info[i + 1].codepoint}; - if (indic_plan->pref.would_substitute (glyphs, ARRAY_LENGTH (glyphs), true, face)) - { - info[i++].mask |= indic_plan->mask_array[PREF]; - info[i++].mask |= indic_plan->mask_array[PREF]; - - /* Mark the subsequent stuff with 'cfar'. Used in Khmer. - * Read the feature spec. - * This allows distinguishing the following cases with MS Khmer fonts: - * U+1784,U+17D2,U+179A,U+17D2,U+1782 - * U+1784,U+17D2,U+1782,U+17D2,U+179A - */ - for (; i < end; i++) - info[i].mask |= indic_plan->mask_array[CFAR]; - - break; - } - } - } - - /* Apply ZWJ/ZWNJ effects */ - for (unsigned int i = start + 1; i < end; i++) - if (is_joiner (info[i])) { - bool non_joiner = info[i].indic_category() == OT_ZWNJ; - unsigned int j = i; - - do { - j--; - - /* ZWJ/ZWNJ should disable CJCT. They do that by simply - * being there, since we don't skip them for the CJCT - * feature (ie. F_MANUAL_ZWJ) */ - - /* A ZWNJ disables HALF. */ - if (non_joiner) - info[j].mask &= ~indic_plan->mask_array[HALF]; - - } while (j > start && !is_consonant (info[j])); - } -} - - -static void -initial_reordering_vowel_syllable (const hb_ot_shape_plan_t *plan, - hb_face_t *face, - hb_buffer_t *buffer, - unsigned int start, unsigned int end) -{ - /* We made the vowels look like consonants. So let's call the consonant logic! */ - initial_reordering_consonant_syllable (plan, face, buffer, start, end); -} - -static void -initial_reordering_standalone_cluster (const hb_ot_shape_plan_t *plan, - hb_face_t *face, - hb_buffer_t *buffer, - unsigned int start, unsigned int end) -{ - /* We treat NBSP/dotted-circle as if they are consonants, so we should just chain. - * Only if not in compatibility mode that is... */ - - if (hb_options ().uniscribe_bug_compatible) - { - /* For dotted-circle, this is what Uniscribe does: - * If dotted-circle is the last glyph, it just does nothing. - * Ie. It doesn't form Reph. */ - if (buffer->info[end - 1].indic_category() == OT_DOTTEDCIRCLE) - return; - } - - initial_reordering_consonant_syllable (plan, face, buffer, start, end); -} - -static void -initial_reordering_broken_cluster (const hb_ot_shape_plan_t *plan, - hb_face_t *face, - hb_buffer_t *buffer, - unsigned int start, unsigned int end) -{ - /* We already inserted dotted-circles, so just call the standalone_cluster. */ - initial_reordering_standalone_cluster (plan, face, buffer, start, end); -} - -static void -initial_reordering_non_indic_cluster (const hb_ot_shape_plan_t *plan HB_UNUSED, - hb_face_t *face HB_UNUSED, - hb_buffer_t *buffer HB_UNUSED, - unsigned int start HB_UNUSED, unsigned int end HB_UNUSED) -{ - /* Nothing to do right now. If we ever switch to using the output - * buffer in the reordering process, we'd need to next_glyph() here. */ -} - - -static void -initial_reordering_syllable (const hb_ot_shape_plan_t *plan, - hb_face_t *face, - hb_buffer_t *buffer, - unsigned int start, unsigned int end) -{ - syllable_type_t syllable_type = (syllable_type_t) (buffer->info[start].syllable() & 0x0F); - switch (syllable_type) { - case consonant_syllable: initial_reordering_consonant_syllable (plan, face, buffer, start, end); return; - case vowel_syllable: initial_reordering_vowel_syllable (plan, face, buffer, start, end); return; - case standalone_cluster: initial_reordering_standalone_cluster (plan, face, buffer, start, end); return; - case broken_cluster: initial_reordering_broken_cluster (plan, face, buffer, start, end); return; - case non_indic_cluster: initial_reordering_non_indic_cluster (plan, face, buffer, start, end); return; - } -} - -static inline void -insert_dotted_circles (const hb_ot_shape_plan_t *plan HB_UNUSED, - hb_font_t *font, - hb_buffer_t *buffer) -{ - /* Note: This loop is extra overhead, but should not be measurable. */ - bool has_broken_syllables = false; - unsigned int count = buffer->len; - for (unsigned int i = 0; i < count; i++) - if ((buffer->info[i].syllable() & 0x0F) == broken_cluster) { - has_broken_syllables = true; - break; - } - if (likely (!has_broken_syllables)) - return; - - - hb_codepoint_t dottedcircle_glyph; - if (!font->get_glyph (0x25CC, 0, &dottedcircle_glyph)) - return; - - hb_glyph_info_t dottedcircle = {0}; - dottedcircle.codepoint = 0x25CC; - set_indic_properties (dottedcircle); - dottedcircle.codepoint = dottedcircle_glyph; - - buffer->clear_output (); - - buffer->idx = 0; - unsigned int last_syllable = 0; - while (buffer->idx < buffer->len) - { - unsigned int syllable = buffer->cur().syllable(); - syllable_type_t syllable_type = (syllable_type_t) (syllable & 0x0F); - if (unlikely (last_syllable != syllable && syllable_type == broken_cluster)) - { - last_syllable = syllable; - - hb_glyph_info_t info = dottedcircle; - info.cluster = buffer->cur().cluster; - info.mask = buffer->cur().mask; - info.syllable() = buffer->cur().syllable(); - - /* Insert dottedcircle after possible Repha. */ - while (buffer->idx < buffer->len && - last_syllable == buffer->cur().syllable() && - buffer->cur().indic_category() == OT_Repha) - buffer->next_glyph (); - - buffer->output_info (info); - } - else - buffer->next_glyph (); - } - - buffer->swap_buffers (); -} - -static void -initial_reordering (const hb_ot_shape_plan_t *plan, - hb_font_t *font, - hb_buffer_t *buffer) -{ - update_consonant_positions (plan, font, buffer); - insert_dotted_circles (plan, font, buffer); - - hb_glyph_info_t *info = buffer->info; - unsigned int count = buffer->len; - if (unlikely (!count)) return; - unsigned int last = 0; - unsigned int last_syllable = info[0].syllable(); - for (unsigned int i = 1; i < count; i++) - if (last_syllable != info[i].syllable()) { - initial_reordering_syllable (plan, font->face, buffer, last, i); - last = i; - last_syllable = info[last].syllable(); - } - initial_reordering_syllable (plan, font->face, buffer, last, count); -} - -static void -final_reordering_syllable (const hb_ot_shape_plan_t *plan, - hb_buffer_t *buffer, - unsigned int start, unsigned int end) -{ - const indic_shape_plan_t *indic_plan = (const indic_shape_plan_t *) plan->data; - hb_glyph_info_t *info = buffer->info; - - /* 4. Final reordering: - * - * After the localized forms and basic shaping forms GSUB features have been - * applied (see below), the shaping engine performs some final glyph - * reordering before applying all the remaining font features to the entire - * cluster. - */ - - /* Find base again */ - unsigned int base; - for (base = start; base < end; base++) - if (info[base].indic_position() >= POS_BASE_C) { - if (start < base && info[base].indic_position() > POS_BASE_C) - base--; - break; - } - if (base == end && start < base && - info[base - 1].indic_category() != OT_ZWJ) - base--; - while (start < base && - (info[base].indic_category() == OT_H || - info[base].indic_category() == OT_N)) - base--; - - - /* o Reorder matras: - * - * If a pre-base matra character had been reordered before applying basic - * features, the glyph can be moved closer to the main consonant based on - * whether half-forms had been formed. Actual position for the matra is - * defined as “after last standalone halant glyph, after initial matra - * position and before the main consonant”. If ZWJ or ZWNJ follow this - * halant, position is moved after it. - */ - - if (start + 1 < end && start < base) /* Otherwise there can't be any pre-base matra characters. */ - { - /* If we lost track of base, alas, position before last thingy. */ - unsigned int new_pos = base == end ? base - 2 : base - 1; - - /* Malayalam / Tamil do not have "half" forms or explicit virama forms. - * The glyphs formed by 'half' are Chillus or ligated explicit viramas. - * We want to position matra after them. - */ - if (buffer->props.script != HB_SCRIPT_MALAYALAM && buffer->props.script != HB_SCRIPT_TAMIL) - { - while (new_pos > start && - !(is_one_of (info[new_pos], (FLAG (OT_M) | FLAG (OT_H) | FLAG (OT_Coeng))))) - new_pos--; - - /* If we found no Halant we are done. - * Otherwise only proceed if the Halant does - * not belong to the Matra itself! */ - if (is_halant_or_coeng (info[new_pos]) && - info[new_pos].indic_position() != POS_PRE_M) - { - /* -> If ZWJ or ZWNJ follow this halant, position is moved after it. */ - if (new_pos + 1 < end && is_joiner (info[new_pos + 1])) - new_pos++; - } - else - new_pos = start; /* No move. */ - } - - if (start < new_pos && info[new_pos].indic_position () != POS_PRE_M) - { - /* Now go see if there's actually any matras... */ - for (unsigned int i = new_pos; i > start; i--) - if (info[i - 1].indic_position () == POS_PRE_M) - { - unsigned int old_pos = i - 1; - hb_glyph_info_t tmp = info[old_pos]; - memmove (&info[old_pos], &info[old_pos + 1], (new_pos - old_pos) * sizeof (info[0])); - info[new_pos] = tmp; - if (old_pos < base && base <= new_pos) /* Shouldn't actually happen. */ - base--; - new_pos--; - } - buffer->merge_clusters (new_pos, MIN (end, base + 1)); - } else { - for (unsigned int i = start; i < base; i++) - if (info[i].indic_position () == POS_PRE_M) { - buffer->merge_clusters (i, MIN (end, base + 1)); - break; - } - } - } - - - /* o Reorder reph: - * - * Reph’s original position is always at the beginning of the syllable, - * (i.e. it is not reordered at the character reordering stage). However, - * it will be reordered according to the basic-forms shaping results. - * Possible positions for reph, depending on the script, are; after main, - * before post-base consonant forms, and after post-base consonant forms. - */ - - /* If there's anything after the Ra that has the REPH pos, it ought to be halant. - * Which means that the font has failed to ligate the Reph. In which case, we - * shouldn't move. */ - if (start + 1 < end && - info[start].indic_position() == POS_RA_TO_BECOME_REPH && - info[start + 1].indic_position() != POS_RA_TO_BECOME_REPH) - { - unsigned int new_reph_pos; - reph_position_t reph_pos = indic_plan->config->reph_pos; - - /* XXX Figure out old behavior too */ - - /* 1. If reph should be positioned after post-base consonant forms, - * proceed to step 5. - */ - if (reph_pos == REPH_POS_AFTER_POST) - { - goto reph_step_5; - } - - /* 2. If the reph repositioning class is not after post-base: target - * position is after the first explicit halant glyph between the - * first post-reph consonant and last main consonant. If ZWJ or ZWNJ - * are following this halant, position is moved after it. If such - * position is found, this is the target position. Otherwise, - * proceed to the next step. - * - * Note: in old-implementation fonts, where classifications were - * fixed in shaping engine, there was no case where reph position - * will be found on this step. - */ - { - new_reph_pos = start + 1; - while (new_reph_pos < base && !is_halant_or_coeng (info[new_reph_pos])) - new_reph_pos++; - - if (new_reph_pos < base && is_halant_or_coeng (info[new_reph_pos])) - { - /* ->If ZWJ or ZWNJ are following this halant, position is moved after it. */ - if (new_reph_pos + 1 < base && is_joiner (info[new_reph_pos + 1])) - new_reph_pos++; - goto reph_move; - } - } - - /* 3. If reph should be repositioned after the main consonant: find the - * first consonant not ligated with main, or find the first - * consonant that is not a potential pre-base reordering Ra. - */ - if (reph_pos == REPH_POS_AFTER_MAIN) - { - new_reph_pos = base; - /* XXX Skip potential pre-base reordering Ra. */ - while (new_reph_pos + 1 < end && info[new_reph_pos + 1].indic_position() <= POS_AFTER_MAIN) - new_reph_pos++; - if (new_reph_pos < end) - goto reph_move; - } - - /* 4. If reph should be positioned before post-base consonant, find - * first post-base classified consonant not ligated with main. If no - * consonant is found, the target position should be before the - * first matra, syllable modifier sign or vedic sign. - */ - /* This is our take on what step 4 is trying to say (and failing, BADLY). */ - if (reph_pos == REPH_POS_AFTER_SUB) - { - new_reph_pos = base; - while (new_reph_pos < end && - !( FLAG (info[new_reph_pos + 1].indic_position()) & (FLAG (POS_POST_C) | FLAG (POS_AFTER_POST) | FLAG (POS_SMVD)))) - new_reph_pos++; - if (new_reph_pos < end) - goto reph_move; - } - - /* 5. If no consonant is found in steps 3 or 4, move reph to a position - * immediately before the first post-base matra, syllable modifier - * sign or vedic sign that has a reordering class after the intended - * reph position. For example, if the reordering position for reph - * is post-main, it will skip above-base matras that also have a - * post-main position. - */ - reph_step_5: - { - /* Copied from step 2. */ - new_reph_pos = start + 1; - while (new_reph_pos < base && !is_halant_or_coeng (info[new_reph_pos])) - new_reph_pos++; - - if (new_reph_pos < base && is_halant_or_coeng (info[new_reph_pos])) - { - /* ->If ZWJ or ZWNJ are following this halant, position is moved after it. */ - if (new_reph_pos + 1 < base && is_joiner (info[new_reph_pos + 1])) - new_reph_pos++; - goto reph_move; - } - } - - /* 6. Otherwise, reorder reph to the end of the syllable. - */ - { - new_reph_pos = end - 1; - while (new_reph_pos > start && info[new_reph_pos].indic_position() == POS_SMVD) - new_reph_pos--; - - /* - * If the Reph is to be ending up after a Matra,Halant sequence, - * position it before that Halant so it can interact with the Matra. - * However, if it's a plain Consonant,Halant we shouldn't do that. - * Uniscribe doesn't do this. - * TEST: U+0930,U+094D,U+0915,U+094B,U+094D - */ - if (!hb_options ().uniscribe_bug_compatible && - unlikely (is_halant_or_coeng (info[new_reph_pos]))) { - for (unsigned int i = base + 1; i < new_reph_pos; i++) - if (info[i].indic_category() == OT_M) { - /* Ok, got it. */ - new_reph_pos--; - } - } - goto reph_move; - } - - reph_move: - { - /* Yay, one big cluster! Merge before moving. */ - buffer->merge_clusters (start, end); - - /* Move */ - hb_glyph_info_t reph = info[start]; - memmove (&info[start], &info[start + 1], (new_reph_pos - start) * sizeof (info[0])); - info[new_reph_pos] = reph; - if (start < base && base <= new_reph_pos) - base--; - } - } - - - /* o Reorder pre-base reordering consonants: - * - * If a pre-base reordering consonant is found, reorder it according to - * the following rules: - */ - - if (indic_plan->mask_array[PREF] && base + 1 < end) /* Otherwise there can't be any pre-base reordering Ra. */ - { - for (unsigned int i = base + 1; i < end; i++) - if ((info[i].mask & indic_plan->mask_array[PREF]) != 0) - { - /* 1. Only reorder a glyph produced by substitution during application - * of the <pref> feature. (Note that a font may shape a Ra consonant with - * the feature generally but block it in certain contexts.) - */ - if (i + 1 == end || (info[i + 1].mask & indic_plan->mask_array[PREF]) == 0) - { - /* - * 2. Try to find a target position the same way as for pre-base matra. - * If it is found, reorder pre-base consonant glyph. - * - * 3. If position is not found, reorder immediately before main - * consonant. - */ - - unsigned int new_pos = base; - /* Malayalam / Tamil do not have "half" forms or explicit virama forms. - * The glyphs formed by 'half' are Chillus or ligated explicit viramas. - * We want to position matra after them. - */ - if (buffer->props.script != HB_SCRIPT_MALAYALAM && buffer->props.script != HB_SCRIPT_TAMIL) - { - while (new_pos > start && - !(is_one_of (info[new_pos - 1], FLAG(OT_M) | HALANT_OR_COENG_FLAGS))) - new_pos--; - - /* In Khmer coeng model, a V,Ra can go *after* matras. If it goes after a - * split matra, it should be reordered to *before* the left part of such matra. */ - if (new_pos > start && info[new_pos - 1].indic_category() == OT_M) - { - unsigned int old_pos = i; - for (unsigned int i = base + 1; i < old_pos; i++) - if (info[i].indic_category() == OT_M) - { - new_pos--; - break; - } - } - } - - if (new_pos > start && is_halant_or_coeng (info[new_pos - 1])) - { - /* -> If ZWJ or ZWNJ follow this halant, position is moved after it. */ - if (new_pos < end && is_joiner (info[new_pos])) - new_pos++; - } - - { - unsigned int old_pos = i; - buffer->merge_clusters (new_pos, old_pos + 1); - hb_glyph_info_t tmp = info[old_pos]; - memmove (&info[new_pos + 1], &info[new_pos], (old_pos - new_pos) * sizeof (info[0])); - info[new_pos] = tmp; - if (new_pos <= base && base < old_pos) - base++; - } - } - - break; - } - } - - - /* Apply 'init' to the Left Matra if it's a word start. */ - if (info[start].indic_position () == POS_PRE_M && - (!start || - !(FLAG (_hb_glyph_info_get_general_category (&info[start - 1])) & - FLAG_RANGE (HB_UNICODE_GENERAL_CATEGORY_FORMAT, HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK)))) - info[start].mask |= indic_plan->mask_array[INIT]; - - - /* - * Finish off the clusters and go home! - */ - if (hb_options ().uniscribe_bug_compatible) - { - /* Uniscribe merges the entire cluster. - * This means, half forms are submerged into the main consonants cluster. - * This is unnecessary, and makes cursor positioning harder, but that's what - * Uniscribe does. */ - buffer->merge_clusters (start, end); - } -} - - -static void -final_reordering (const hb_ot_shape_plan_t *plan, - hb_font_t *font HB_UNUSED, - hb_buffer_t *buffer) -{ - unsigned int count = buffer->len; - if (unlikely (!count)) return; - - hb_glyph_info_t *info = buffer->info; - unsigned int last = 0; - unsigned int last_syllable = info[0].syllable(); - for (unsigned int i = 1; i < count; i++) - if (last_syllable != info[i].syllable()) { - final_reordering_syllable (plan, buffer, last, i); - last = i; - last_syllable = info[last].syllable(); - } - final_reordering_syllable (plan, buffer, last, count); - - /* Zero syllables now... */ - for (unsigned int i = 0; i < count; i++) - info[i].syllable() = 0; - - HB_BUFFER_DEALLOCATE_VAR (buffer, indic_category); - HB_BUFFER_DEALLOCATE_VAR (buffer, indic_position); -} - - -static hb_ot_shape_normalization_mode_t -normalization_preference_indic (const hb_segment_properties_t *props HB_UNUSED) -{ - return HB_OT_SHAPE_NORMALIZATION_MODE_COMPOSED_DIACRITICS_NO_SHORT_CIRCUIT; -} - -static bool -decompose_indic (const hb_ot_shape_normalize_context_t *c, - hb_codepoint_t ab, - hb_codepoint_t *a, - hb_codepoint_t *b) -{ - switch (ab) - { - /* Don't decompose these. */ - case 0x0931 : return false; - case 0x0B94 : return false; - - - /* - * Decompose split matras that don't have Unicode decompositions. - */ - - case 0x0F77 : *a = 0x0FB2; *b= 0x0F81; return true; - case 0x0F79 : *a = 0x0FB3; *b= 0x0F81; return true; - case 0x17BE : *a = 0x17C1; *b= 0x17BE; return true; - case 0x17BF : *a = 0x17C1; *b= 0x17BF; return true; - case 0x17C0 : *a = 0x17C1; *b= 0x17C0; return true; - case 0x17C4 : *a = 0x17C1; *b= 0x17C4; return true; - case 0x17C5 : *a = 0x17C1; *b= 0x17C5; return true; - case 0x1925 : *a = 0x1920; *b= 0x1923; return true; - case 0x1926 : *a = 0x1920; *b= 0x1924; return true; - case 0x1B3C : *a = 0x1B42; *b= 0x1B3C; return true; - case 0x1112E : *a = 0x11127; *b= 0x11131; return true; - case 0x1112F : *a = 0x11127; *b= 0x11132; return true; -#if 0 - /* This one has no decomposition in Unicode, but needs no decomposition either. */ - /* case 0x0AC9 : return false; */ - case 0x0B57 : *a = no decomp, -> RIGHT; return true; - case 0x1C29 : *a = no decomp, -> LEFT; return true; - case 0xA9C0 : *a = no decomp, -> RIGHT; return true; - case 0x111BF : *a = no decomp, -> ABOVE; return true; -#endif - } - - if ((ab == 0x0DDA || hb_in_range<hb_codepoint_t> (ab, 0x0DDC, 0x0DDE))) - { - /* - * Sinhala split matras... Let the fun begin. - * - * These four characters have Unicode decompositions. However, Uniscribe - * decomposes them "Khmer-style", that is, it uses the character itself to - * get the second half. The first half of all four decompositions is always - * U+0DD9. - * - * Now, there are buggy fonts, namely, the widely used lklug.ttf, that are - * broken with Uniscribe. But we need to support them. As such, we only - * do the Uniscribe-style decomposition if the character is transformed into - * its "sec.half" form by the 'pstf' feature. Otherwise, we fall back to - * Unicode decomposition. - * - * Note that we can't unconditionally use Unicode decomposition. That would - * break some other fonts, that are designed to work with Uniscribe, and - * don't have positioning features for the Unicode-style decomposition. - * - * Argh... - * - * The Uniscribe behavior is now documented in the newly published Sinhala - * spec in 2012: - * - * http://www.microsoft.com/typography/OpenTypeDev/sinhala/intro.htm#shaping - */ - - const indic_shape_plan_t *indic_plan = (const indic_shape_plan_t *) c->plan->data; - - hb_codepoint_t glyph; - - if (hb_options ().uniscribe_bug_compatible || - (c->font->get_glyph (ab, 0, &glyph) && - indic_plan->pstf.would_substitute (&glyph, 1, true, c->font->face))) - { - /* Ok, safe to use Uniscribe-style decomposition. */ - *a = 0x0DD9; - *b = ab; - return true; - } - } - - return c->unicode->decompose (ab, a, b); -} - -static bool -compose_indic (const hb_ot_shape_normalize_context_t *c, - hb_codepoint_t a, - hb_codepoint_t b, - hb_codepoint_t *ab) -{ - /* Avoid recomposing split matras. */ - if (HB_UNICODE_GENERAL_CATEGORY_IS_MARK (c->unicode->general_category (a))) - return false; - - /* Composition-exclusion exceptions that we want to recompose. */ - if (a == 0x09AF && b == 0x09BC) { *ab = 0x09DF; return true; } - - return c->unicode->compose (a, b, ab); -} - - -const hb_ot_complex_shaper_t _hb_ot_complex_shaper_indic = -{ - "indic", - collect_features_indic, - override_features_indic, - data_create_indic, - data_destroy_indic, - NULL, /* preprocess_text */ - normalization_preference_indic, - decompose_indic, - compose_indic, - setup_masks_indic, - HB_OT_SHAPE_ZERO_WIDTH_MARKS_NONE, - false, /* fallback_position */ -}; |