diff options
Diffstat (limited to 'src/3rdparty/harfbuzz-ng/src/hb-ot-shape-complex-indic.cc')
| -rw-r--r-- | src/3rdparty/harfbuzz-ng/src/hb-ot-shape-complex-indic.cc | 1673 |
1 files changed, 1673 insertions, 0 deletions
diff --git a/src/3rdparty/harfbuzz-ng/src/hb-ot-shape-complex-indic.cc b/src/3rdparty/harfbuzz-ng/src/hb-ot-shape-complex-indic.cc new file mode 100644 index 0000000000..d3c475b6ab --- /dev/null +++ b/src/3rdparty/harfbuzz-ng/src/hb-ot-shape-complex-indic.cc @@ -0,0 +1,1673 @@ +/* + * 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 */ +}; |