/* * Copyright © 2011,2012,2013 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" /* buffer var allocations */ #define myanmar_category() complex_var_u8_0() /* myanmar_category_t */ #define myanmar_position() complex_var_u8_1() /* myanmar_position_t */ /* * Myanmar shaper. */ static const hb_tag_t basic_features[] = { /* * Basic features. * These features are applied in order, one at a time, after initial_reordering. */ HB_TAG('r','p','h','f'), HB_TAG('p','r','e','f'), HB_TAG('b','l','w','f'), HB_TAG('p','s','t','f'), }; static const hb_tag_t other_features[] = { /* * Other features. * These features are applied all at once, after final_reordering. */ HB_TAG('p','r','e','s'), HB_TAG('a','b','v','s'), HB_TAG('b','l','w','s'), HB_TAG('p','s','t','s'), /* Positioning features, though we don't care about the types. */ HB_TAG('d','i','s','t'), /* Pre-release version of Windows 8 Myanmar font had abvm,blwm * features. The released Windows 8 version of the font (as well * as the released spec) used 'mark' instead. The Windows 8 * shaper however didn't apply 'mark' but did apply 'mkmk'. * Perhaps it applied abvm/blwm. This was fixed in a Windows 8 * update, so now it applies mark/mkmk. We are guessing that * it still applies abvm/blwm too. */ HB_TAG('a','b','v','m'), HB_TAG('b','l','w','m'), }; 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_myanmar (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')); map->add_gsub_pause (initial_reordering); for (unsigned int i = 0; i < ARRAY_LENGTH (basic_features); i++) { map->add_feature (basic_features[i], 1, F_GLOBAL | F_MANUAL_ZWJ); map->add_gsub_pause (NULL); } map->add_gsub_pause (final_reordering); for (unsigned int i = 0; i < ARRAY_LENGTH (other_features); i++) map->add_feature (other_features[i], 1, F_GLOBAL | F_MANUAL_ZWJ); } static void override_features_myanmar (hb_ot_shape_planner_t *plan) { plan->map.add_feature (HB_TAG('l','i','g','a'), 0, F_GLOBAL); } enum syllable_type_t { consonant_syllable, punctuation_cluster, broken_cluster, non_myanmar_cluster, }; #include "hb-ot-shape-complex-myanmar-machine.hh" /* Note: This enum is duplicated in the -machine.rl source file. * Not sure how to avoid duplication. */ enum myanmar_category_t { OT_As = 18, /* Asat */ OT_D = 19, /* Digits except zero */ OT_D0 = 20, /* Digit zero */ OT_DB = OT_N, /* Dot below */ OT_GB = OT_PLACEHOLDER, OT_MH = 21, /* Various consonant medial types */ OT_MR = 22, /* Various consonant medial types */ OT_MW = 23, /* Various consonant medial types */ OT_MY = 24, /* Various consonant medial types */ OT_PT = 25, /* Pwo and other tones */ OT_VAbv = 26, OT_VBlw = 27, OT_VPre = 28, OT_VPst = 29, OT_VS = 30, /* Variation selectors */ OT_P = 31 /* Punctuation */ }; static inline bool is_one_of (const hb_glyph_info_t &info, unsigned int flags) { /* If it ligated, all bets are off. */ if (_hb_glyph_info_ligated (&info)) return false; return !!(FLAG_SAFE (info.myanmar_category()) & flags); } static inline bool is_consonant (const hb_glyph_info_t &info) { return is_one_of (info, CONSONANT_FLAGS); } static inline void set_myanmar_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 & 0x7Fu); indic_position_t pos = (indic_position_t) (type >> 8); /* Myanmar * http://www.microsoft.com/typography/OpenTypeDev/myanmar/intro.htm#analyze */ if (unlikely (hb_in_range (u, 0xFE00u, 0xFE0Fu))) cat = (indic_category_t) OT_VS; switch (u) { case 0x104Eu: cat = (indic_category_t) OT_C; /* The spec says C, IndicSyllableCategory doesn't have. */ break; case 0x002Du: case 0x00A0u: case 0x00D7u: case 0x2012u: case 0x2013u: case 0x2014u: case 0x2015u: case 0x2022u: case 0x25CCu: case 0x25FBu: case 0x25FCu: case 0x25FDu: case 0x25FEu: cat = (indic_category_t) OT_GB; break; case 0x1004u: case 0x101Bu: case 0x105Au: cat = (indic_category_t) OT_Ra; break; case 0x1032u: case 0x1036u: cat = (indic_category_t) OT_A; break; case 0x103Au: cat = (indic_category_t) OT_As; break; case 0x1041u: case 0x1042u: case 0x1043u: case 0x1044u: case 0x1045u: case 0x1046u: case 0x1047u: case 0x1048u: case 0x1049u: case 0x1090u: case 0x1091u: case 0x1092u: case 0x1093u: case 0x1094u: case 0x1095u: case 0x1096u: case 0x1097u: case 0x1098u: case 0x1099u: cat = (indic_category_t) OT_D; break; case 0x1040u: cat = (indic_category_t) OT_D; /* XXX The spec says D0, but Uniscribe doesn't seem to do. */ break; case 0x103Eu: case 0x1060u: cat = (indic_category_t) OT_MH; break; case 0x103Cu: cat = (indic_category_t) OT_MR; break; case 0x103Du: case 0x1082u: cat = (indic_category_t) OT_MW; break; case 0x103Bu: case 0x105Eu: case 0x105Fu: cat = (indic_category_t) OT_MY; break; case 0x1063u: case 0x1064u: case 0x1069u: case 0x106Au: case 0x106Bu: case 0x106Cu: case 0x106Du: case 0xAA7Bu: cat = (indic_category_t) OT_PT; break; case 0x1038u: case 0x1087u: case 0x1088u: case 0x1089u: case 0x108Au: case 0x108Bu: case 0x108Cu: case 0x108Du: case 0x108Fu: case 0x109Au: case 0x109Bu: case 0x109Cu: cat = (indic_category_t) OT_SM; break; case 0x104Au: case 0x104Bu: cat = (indic_category_t) OT_P; break; } if (cat == OT_M) { switch ((int) pos) { case POS_PRE_C: cat = (indic_category_t) OT_VPre; pos = POS_PRE_M; break; case POS_ABOVE_C: cat = (indic_category_t) OT_VAbv; break; case POS_BELOW_C: cat = (indic_category_t) OT_VBlw; break; case POS_POST_C: cat = (indic_category_t) OT_VPst; break; } } info.myanmar_category() = (myanmar_category_t) cat; info.myanmar_position() = pos; } static void setup_masks_myanmar (const hb_ot_shape_plan_t *plan HB_UNUSED, hb_buffer_t *buffer, hb_font_t *font HB_UNUSED) { HB_BUFFER_ALLOCATE_VAR (buffer, myanmar_category); HB_BUFFER_ALLOCATE_VAR (buffer, myanmar_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; hb_glyph_info_t *info = buffer->info; for (unsigned int i = 0; i < count; i++) set_myanmar_properties (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_myanmar_order (const hb_glyph_info_t *pa, const hb_glyph_info_t *pb) { int a = pa->myanmar_position(); int b = pb->myanmar_position(); return a < b ? -1 : a == b ? 0 : +1; } /* Rules from: * http://www.microsoft.com/typography/OpenTypeDev/myanmar/intro.htm */ static void initial_reordering_consonant_syllable (hb_buffer_t *buffer, unsigned int start, unsigned int end) { hb_glyph_info_t *info = buffer->info; unsigned int base = end; bool has_reph = false; { unsigned int limit = start; if (start + 3 <= end && info[start ].myanmar_category() == OT_Ra && info[start+1].myanmar_category() == OT_As && info[start+2].myanmar_category() == OT_H) { limit += 3; base = start; has_reph = true; } { if (!has_reph) base = limit; for (unsigned int i = limit; i < end; i++) if (is_consonant (info[i])) { base = i; break; } } } /* Reorder! */ { unsigned int i = start; for (; i < start + (has_reph ? 3 : 0); i++) info[i].myanmar_position() = POS_AFTER_MAIN; for (; i < base; i++) info[i].myanmar_position() = POS_PRE_C; if (i < end) { info[i].myanmar_position() = POS_BASE_C; i++; } indic_position_t pos = POS_AFTER_MAIN; /* The following loop may be ugly, but it implements all of * Myanmar reordering! */ for (; i < end; i++) { if (info[i].myanmar_category() == OT_MR) /* Pre-base reordering */ { info[i].myanmar_position() = POS_PRE_C; continue; } if (info[i].myanmar_position() < POS_BASE_C) /* Left matra */ { continue; } if (pos == POS_AFTER_MAIN && info[i].myanmar_category() == OT_VBlw) { pos = POS_BELOW_C; info[i].myanmar_position() = pos; continue; } if (pos == POS_BELOW_C && info[i].myanmar_category() == OT_A) { info[i].myanmar_position() = POS_BEFORE_SUB; continue; } if (pos == POS_BELOW_C && info[i].myanmar_category() == OT_VBlw) { info[i].myanmar_position() = pos; continue; } if (pos == POS_BELOW_C && info[i].myanmar_category() != OT_A) { pos = POS_AFTER_SUB; info[i].myanmar_position() = pos; continue; } info[i].myanmar_position() = pos; } } buffer->merge_clusters (start, end); /* Sit tight, rock 'n roll! */ hb_stable_sort (info + start, end - start, compare_myanmar_order); } 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 broken_cluster: /* We already inserted dotted-circles, so just call the consonant_syllable. */ case consonant_syllable: initial_reordering_consonant_syllable (buffer, start, end); break; case punctuation_cluster: case non_myanmar_cluster: break; } } 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; hb_glyph_info_t *info = buffer->info; for (unsigned int i = 0; i < count; i++) if ((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 (0x25CCu, 0, &dottedcircle_glyph)) return; hb_glyph_info_t dottedcircle = {0}; dottedcircle.codepoint = 0x25CCu; set_myanmar_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(); 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) { insert_dotted_circles (plan, font, buffer); foreach_syllable (buffer, start, end) initial_reordering_syllable (plan, font->face, buffer, start, end); } static void final_reordering (const hb_ot_shape_plan_t *plan, hb_font_t *font HB_UNUSED, hb_buffer_t *buffer) { hb_glyph_info_t *info = buffer->info; unsigned int count = buffer->len; /* Zero syllables now... */ for (unsigned int i = 0; i < count; i++) info[i].syllable() = 0; HB_BUFFER_DEALLOCATE_VAR (buffer, myanmar_category); HB_BUFFER_DEALLOCATE_VAR (buffer, myanmar_position); } /* Uniscribe seems to have a shaper for 'mymr' that is like the * generic shaper, except that it zeros mark advances GDEF_LATE. */ const hb_ot_complex_shaper_t _hb_ot_complex_shaper_myanmar_old = { "default", NULL, /* collect_features */ NULL, /* override_features */ NULL, /* data_create */ NULL, /* data_destroy */ NULL, /* preprocess_text */ HB_OT_SHAPE_NORMALIZATION_MODE_DEFAULT, NULL, /* decompose */ NULL, /* compose */ NULL, /* setup_masks */ HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_LATE, true, /* fallback_position */ }; const hb_ot_complex_shaper_t _hb_ot_complex_shaper_myanmar = { "myanmar", collect_features_myanmar, override_features_myanmar, NULL, /* data_create */ NULL, /* data_destroy */ NULL, /* preprocess_text */ HB_OT_SHAPE_NORMALIZATION_MODE_COMPOSED_DIACRITICS_NO_SHORT_CIRCUIT, NULL, /* decompose */ NULL, /* compose */ setup_masks_myanmar, HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_EARLY, false, /* fallback_position */ };