| /* |
| * 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.hh" |
| |
| #ifndef HB_NO_OT_SHAPE |
| |
| #include "hb-ot-shaper-myanmar-machine.hh" |
| #include "hb-ot-shaper-indic.hh" |
| #include "hb-ot-layout.hh" |
| |
| |
| /* |
| * Myanmar shaper. |
| */ |
| |
| |
| static const hb_tag_t |
| myanmar_basic_features[] = |
| { |
| /* |
| * Basic features. |
| * These features are applied in order, one at a time, after reordering, |
| * constrained to the syllable. |
| */ |
| 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 |
| myanmar_other_features[] = |
| { |
| /* |
| * Other features. |
| * These features are applied all at once, after clearing syllables. |
| */ |
| HB_TAG('p','r','e','s'), |
| HB_TAG('a','b','v','s'), |
| HB_TAG('b','l','w','s'), |
| HB_TAG('p','s','t','s'), |
| }; |
| |
| 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); |
| |
| info.myanmar_category() = (myanmar_category_t) (type & 0xFFu); |
| } |
| |
| |
| static inline bool |
| is_one_of_myanmar (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_UNSAFE (info.myanmar_category()) & 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! |
| * |
| * Keep in sync with consonant_categories in the generator. */ |
| #define CONSONANT_FLAGS_MYANMAR (FLAG (M_Cat(C)) | FLAG (M_Cat(CS)) | FLAG (M_Cat(Ra)) | /* FLAG (M_Cat(CM)) | */ FLAG (M_Cat(IV)) | FLAG (M_Cat(GB)) | FLAG (M_Cat(DOTTEDCIRCLE))) |
| |
| static inline bool |
| is_consonant_myanmar (const hb_glyph_info_t &info) |
| { |
| return is_one_of_myanmar (info, CONSONANT_FLAGS_MYANMAR); |
| } |
| |
| |
| static void |
| setup_syllables_myanmar (const hb_ot_shape_plan_t *plan, |
| hb_font_t *font, |
| hb_buffer_t *buffer); |
| static void |
| reorder_myanmar (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_myanmar); |
| |
| map->enable_feature (HB_TAG('l','o','c','l'), F_PER_SYLLABLE); |
| /* 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->enable_feature (HB_TAG('c','c','m','p'), F_PER_SYLLABLE); |
| |
| |
| map->add_gsub_pause (reorder_myanmar); |
| |
| for (unsigned int i = 0; i < ARRAY_LENGTH (myanmar_basic_features); i++) |
| { |
| map->enable_feature (myanmar_basic_features[i], F_MANUAL_ZWJ | F_PER_SYLLABLE); |
| map->add_gsub_pause (nullptr); |
| } |
| map->add_gsub_pause (hb_syllabic_clear_var); // Don't need syllables anymore, use stop to free buffer var |
| |
| for (unsigned int i = 0; i < ARRAY_LENGTH (myanmar_other_features); i++) |
| map->enable_feature (myanmar_other_features[i], F_MANUAL_ZWJ); |
| } |
| |
| 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); |
| |
| /* No masks, we just save information about characters. */ |
| |
| 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_myanmar (const hb_ot_shape_plan_t *plan HB_UNUSED, |
| hb_font_t *font HB_UNUSED, |
| hb_buffer_t *buffer) |
| { |
| HB_BUFFER_ALLOCATE_VAR (buffer, syllable); |
| find_syllables_myanmar (buffer); |
| foreach_syllable (buffer, start, end) |
| buffer->unsafe_to_break (start, end); |
| } |
| |
| 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 (int) a - (int) b; |
| } |
| |
| |
| /* Rules from: |
| * https://docs.microsoft.com/en-us/typography/script-development/myanmar */ |
| |
| 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() == M_Cat(Ra) && |
| info[start+1].myanmar_category() == M_Cat(As) && |
| info[start+2].myanmar_category() == M_Cat(H)) |
| { |
| limit += 3; |
| base = start; |
| has_reph = true; |
| } |
| |
| { |
| if (!has_reph) |
| base = limit; |
| |
| for (unsigned int i = limit; i < end; i++) |
| if (is_consonant_myanmar (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++; |
| } |
| myanmar_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() == M_Cat(MR)) /* Pre-base reordering */ |
| { |
| info[i].myanmar_position() = POS_PRE_C; |
| continue; |
| } |
| if (info[i].myanmar_category() == M_Cat(VPre)) /* Left matra */ |
| { |
| info[i].myanmar_position() = POS_PRE_M; |
| continue; |
| } |
| if (info[i].myanmar_category() == M_Cat(VS)) |
| { |
| info[i].myanmar_position() = info[i - 1].myanmar_position(); |
| continue; |
| } |
| |
| if (pos == POS_AFTER_MAIN && info[i].myanmar_category() == M_Cat(VBlw)) |
| { |
| pos = POS_BELOW_C; |
| info[i].myanmar_position() = pos; |
| continue; |
| } |
| |
| if (pos == POS_BELOW_C && info[i].myanmar_category() == M_Cat(A)) |
| { |
| info[i].myanmar_position() = POS_BEFORE_SUB; |
| continue; |
| } |
| if (pos == POS_BELOW_C && info[i].myanmar_category() == M_Cat(VBlw)) |
| { |
| info[i].myanmar_position() = pos; |
| continue; |
| } |
| if (pos == POS_BELOW_C && info[i].myanmar_category() != M_Cat(A)) |
| { |
| pos = POS_AFTER_SUB; |
| info[i].myanmar_position() = pos; |
| continue; |
| } |
| info[i].myanmar_position() = pos; |
| } |
| } |
| |
| /* Sit tight, rock 'n roll! */ |
| buffer->sort (start, end, compare_myanmar_order); |
| } |
| |
| static void |
| reorder_syllable_myanmar (const hb_ot_shape_plan_t *plan HB_UNUSED, |
| hb_face_t *face HB_UNUSED, |
| hb_buffer_t *buffer, |
| unsigned int start, unsigned int end) |
| { |
| myanmar_syllable_type_t syllable_type = (myanmar_syllable_type_t) (buffer->info[start].syllable() & 0x0F); |
| switch (syllable_type) { |
| |
| case myanmar_broken_cluster: /* We already inserted dotted-circles, so just call the consonant_syllable. */ |
| case myanmar_consonant_syllable: |
| initial_reordering_consonant_syllable (buffer, start, end); |
| break; |
| |
| case myanmar_non_myanmar_cluster: |
| break; |
| } |
| } |
| |
| static void |
| reorder_myanmar (const hb_ot_shape_plan_t *plan, |
| hb_font_t *font, |
| hb_buffer_t *buffer) |
| { |
| if (buffer->message (font, "start reordering myanmar")) |
| { |
| hb_syllabic_insert_dotted_circles (font, buffer, |
| myanmar_broken_cluster, |
| M_Cat(DOTTEDCIRCLE)); |
| |
| foreach_syllable (buffer, start, end) |
| reorder_syllable_myanmar (plan, font->face, buffer, start, end); |
| (void) buffer->message (font, "end reordering myanmar"); |
| } |
| |
| HB_BUFFER_DEALLOCATE_VAR (buffer, myanmar_category); |
| HB_BUFFER_DEALLOCATE_VAR (buffer, myanmar_position); |
| } |
| |
| |
| const hb_ot_shaper_t _hb_ot_shaper_myanmar = |
| { |
| collect_features_myanmar, |
| nullptr, /* override_features */ |
| nullptr, /* data_create */ |
| nullptr, /* data_destroy */ |
| nullptr, /* preprocess_text */ |
| nullptr, /* postprocess_glyphs */ |
| nullptr, /* decompose */ |
| nullptr, /* compose */ |
| setup_masks_myanmar, |
| nullptr, /* reorder_marks */ |
| HB_TAG_NONE, /* gpos_tag */ |
| HB_OT_SHAPE_NORMALIZATION_MODE_COMPOSED_DIACRITICS_NO_SHORT_CIRCUIT, |
| HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_EARLY, |
| false, /* fallback_position */ |
| }; |
| |
| |
| /* Ugly Zawgyi encoding. |
| * Disable all auto processing. |
| * https://github.com/harfbuzz/harfbuzz/issues/1162 */ |
| const hb_ot_shaper_t _hb_ot_shaper_myanmar_zawgyi = |
| { |
| nullptr, /* collect_features */ |
| nullptr, /* override_features */ |
| nullptr, /* data_create */ |
| nullptr, /* data_destroy */ |
| nullptr, /* preprocess_text */ |
| nullptr, /* postprocess_glyphs */ |
| nullptr, /* decompose */ |
| nullptr, /* compose */ |
| nullptr, /* setup_masks */ |
| nullptr, /* reorder_marks */ |
| HB_TAG_NONE, /* gpos_tag */ |
| HB_OT_SHAPE_NORMALIZATION_MODE_NONE, |
| HB_OT_SHAPE_ZERO_WIDTH_MARKS_NONE, |
| false, /* fallback_position */ |
| }; |
| |
| |
| #endif |