388 lines
10 KiB
C++
388 lines
10 KiB
C++
/*
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* Copyright © 2011,2012,2013 Google, Inc.
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Google Author(s): Behdad Esfahbod
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*/
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#include "hb.hh"
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#ifndef HB_NO_OT_SHAPE
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#include "hb-ot-shape-complex-myanmar.hh"
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/*
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* Myanmar shaper.
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*/
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static const hb_tag_t
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myanmar_basic_features[] =
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{
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/*
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* Basic features.
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* These features are applied in order, one at a time, after reordering.
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*/
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HB_TAG('r','p','h','f'),
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HB_TAG('p','r','e','f'),
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HB_TAG('b','l','w','f'),
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HB_TAG('p','s','t','f'),
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};
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static const hb_tag_t
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myanmar_other_features[] =
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{
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/*
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* Other features.
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* These features are applied all at once, after clearing syllables.
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*/
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HB_TAG('p','r','e','s'),
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HB_TAG('a','b','v','s'),
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HB_TAG('b','l','w','s'),
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HB_TAG('p','s','t','s'),
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};
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static void
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setup_syllables_myanmar (const hb_ot_shape_plan_t *plan,
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hb_font_t *font,
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hb_buffer_t *buffer);
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static void
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reorder_myanmar (const hb_ot_shape_plan_t *plan,
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hb_font_t *font,
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hb_buffer_t *buffer);
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static void
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collect_features_myanmar (hb_ot_shape_planner_t *plan)
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{
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hb_ot_map_builder_t *map = &plan->map;
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/* Do this before any lookups have been applied. */
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map->add_gsub_pause (setup_syllables_myanmar);
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map->enable_feature (HB_TAG('l','o','c','l'));
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/* The Indic specs do not require ccmp, but we apply it here since if
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* there is a use of it, it's typically at the beginning. */
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map->enable_feature (HB_TAG('c','c','m','p'));
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map->add_gsub_pause (reorder_myanmar);
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for (unsigned int i = 0; i < ARRAY_LENGTH (myanmar_basic_features); i++)
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{
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map->enable_feature (myanmar_basic_features[i], F_MANUAL_ZWJ);
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map->add_gsub_pause (nullptr);
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}
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map->add_gsub_pause (_hb_clear_syllables);
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for (unsigned int i = 0; i < ARRAY_LENGTH (myanmar_other_features); i++)
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map->enable_feature (myanmar_other_features[i], F_MANUAL_ZWJ);
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}
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static void
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override_features_myanmar (hb_ot_shape_planner_t *plan)
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{
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plan->map.disable_feature (HB_TAG('l','i','g','a'));
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}
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enum myanmar_syllable_type_t {
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myanmar_consonant_syllable,
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myanmar_punctuation_cluster,
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myanmar_broken_cluster,
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myanmar_non_myanmar_cluster,
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};
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#include "hb-ot-shape-complex-myanmar-machine.hh"
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static void
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setup_masks_myanmar (const hb_ot_shape_plan_t *plan HB_UNUSED,
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hb_buffer_t *buffer,
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hb_font_t *font HB_UNUSED)
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{
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HB_BUFFER_ALLOCATE_VAR (buffer, myanmar_category);
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HB_BUFFER_ALLOCATE_VAR (buffer, myanmar_position);
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/* We cannot setup masks here. We save information about characters
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* and setup masks later on in a pause-callback. */
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unsigned int count = buffer->len;
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hb_glyph_info_t *info = buffer->info;
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for (unsigned int i = 0; i < count; i++)
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set_myanmar_properties (info[i]);
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}
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static void
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setup_syllables_myanmar (const hb_ot_shape_plan_t *plan HB_UNUSED,
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hb_font_t *font HB_UNUSED,
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hb_buffer_t *buffer)
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{
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find_syllables_myanmar (buffer);
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foreach_syllable (buffer, start, end)
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buffer->unsafe_to_break (start, end);
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}
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static int
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compare_myanmar_order (const hb_glyph_info_t *pa, const hb_glyph_info_t *pb)
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{
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int a = pa->myanmar_position();
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int b = pb->myanmar_position();
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return a < b ? -1 : a == b ? 0 : +1;
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}
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/* Rules from:
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* https://docs.microsoft.com/en-us/typography/script-development/myanmar */
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static void
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initial_reordering_consonant_syllable (hb_buffer_t *buffer,
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unsigned int start, unsigned int end)
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{
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hb_glyph_info_t *info = buffer->info;
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unsigned int base = end;
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bool has_reph = false;
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{
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unsigned int limit = start;
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if (start + 3 <= end &&
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info[start ].myanmar_category() == OT_Ra &&
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info[start+1].myanmar_category() == OT_As &&
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info[start+2].myanmar_category() == OT_H)
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{
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limit += 3;
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base = start;
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has_reph = true;
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}
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{
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if (!has_reph)
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base = limit;
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for (unsigned int i = limit; i < end; i++)
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if (is_consonant (info[i]))
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{
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base = i;
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break;
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}
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}
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}
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/* Reorder! */
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{
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unsigned int i = start;
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for (; i < start + (has_reph ? 3 : 0); i++)
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info[i].myanmar_position() = POS_AFTER_MAIN;
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for (; i < base; i++)
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info[i].myanmar_position() = POS_PRE_C;
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if (i < end)
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{
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info[i].myanmar_position() = POS_BASE_C;
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i++;
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}
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indic_position_t pos = POS_AFTER_MAIN;
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/* The following loop may be ugly, but it implements all of
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* Myanmar reordering! */
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for (; i < end; i++)
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{
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if (info[i].myanmar_category() == OT_MR) /* Pre-base reordering */
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{
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info[i].myanmar_position() = POS_PRE_C;
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continue;
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}
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if (info[i].myanmar_position() < POS_BASE_C) /* Left matra */
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{
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continue;
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}
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if (info[i].myanmar_category() == OT_VS)
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{
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info[i].myanmar_position() = info[i - 1].myanmar_position();
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continue;
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}
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if (pos == POS_AFTER_MAIN && info[i].myanmar_category() == OT_VBlw)
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{
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pos = POS_BELOW_C;
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info[i].myanmar_position() = pos;
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continue;
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}
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if (pos == POS_BELOW_C && info[i].myanmar_category() == OT_A)
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{
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info[i].myanmar_position() = POS_BEFORE_SUB;
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continue;
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}
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if (pos == POS_BELOW_C && info[i].myanmar_category() == OT_VBlw)
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{
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info[i].myanmar_position() = pos;
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continue;
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}
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if (pos == POS_BELOW_C && info[i].myanmar_category() != OT_A)
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{
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pos = POS_AFTER_SUB;
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info[i].myanmar_position() = pos;
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continue;
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}
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info[i].myanmar_position() = pos;
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}
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}
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/* Sit tight, rock 'n roll! */
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buffer->sort (start, end, compare_myanmar_order);
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}
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static void
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reorder_syllable_myanmar (const hb_ot_shape_plan_t *plan HB_UNUSED,
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hb_face_t *face HB_UNUSED,
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hb_buffer_t *buffer,
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unsigned int start, unsigned int end)
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{
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myanmar_syllable_type_t syllable_type = (myanmar_syllable_type_t) (buffer->info[start].syllable() & 0x0F);
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switch (syllable_type) {
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case myanmar_broken_cluster: /* We already inserted dotted-circles, so just call the consonant_syllable. */
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case myanmar_consonant_syllable:
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initial_reordering_consonant_syllable (buffer, start, end);
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break;
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case myanmar_punctuation_cluster:
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case myanmar_non_myanmar_cluster:
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break;
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}
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}
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static inline void
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insert_dotted_circles_myanmar (const hb_ot_shape_plan_t *plan HB_UNUSED,
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hb_font_t *font,
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hb_buffer_t *buffer)
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{
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if (unlikely (buffer->flags & HB_BUFFER_FLAG_DO_NOT_INSERT_DOTTED_CIRCLE))
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return;
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/* Note: This loop is extra overhead, but should not be measurable.
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* TODO Use a buffer scratch flag to remove the loop. */
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bool has_broken_syllables = false;
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unsigned int count = buffer->len;
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hb_glyph_info_t *info = buffer->info;
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for (unsigned int i = 0; i < count; i++)
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if ((info[i].syllable() & 0x0F) == myanmar_broken_cluster)
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{
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has_broken_syllables = true;
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break;
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}
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if (likely (!has_broken_syllables))
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return;
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hb_codepoint_t dottedcircle_glyph;
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if (!font->get_nominal_glyph (0x25CCu, &dottedcircle_glyph))
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return;
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hb_glyph_info_t dottedcircle = {0};
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dottedcircle.codepoint = 0x25CCu;
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set_myanmar_properties (dottedcircle);
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dottedcircle.codepoint = dottedcircle_glyph;
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buffer->clear_output ();
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buffer->idx = 0;
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unsigned int last_syllable = 0;
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while (buffer->idx < buffer->len && buffer->successful)
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{
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unsigned int syllable = buffer->cur().syllable();
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myanmar_syllable_type_t syllable_type = (myanmar_syllable_type_t) (syllable & 0x0F);
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if (unlikely (last_syllable != syllable && syllable_type == myanmar_broken_cluster))
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{
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last_syllable = syllable;
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hb_glyph_info_t ginfo = dottedcircle;
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ginfo.cluster = buffer->cur().cluster;
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ginfo.mask = buffer->cur().mask;
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ginfo.syllable() = buffer->cur().syllable();
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buffer->output_info (ginfo);
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}
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else
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buffer->next_glyph ();
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}
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buffer->swap_buffers ();
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}
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static void
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reorder_myanmar (const hb_ot_shape_plan_t *plan,
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hb_font_t *font,
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hb_buffer_t *buffer)
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{
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insert_dotted_circles_myanmar (plan, font, buffer);
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foreach_syllable (buffer, start, end)
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reorder_syllable_myanmar (plan, font->face, buffer, start, end);
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HB_BUFFER_DEALLOCATE_VAR (buffer, myanmar_category);
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HB_BUFFER_DEALLOCATE_VAR (buffer, myanmar_position);
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}
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const hb_ot_complex_shaper_t _hb_ot_complex_shaper_myanmar =
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{
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collect_features_myanmar,
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override_features_myanmar,
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nullptr, /* data_create */
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nullptr, /* data_destroy */
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nullptr, /* preprocess_text */
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nullptr, /* postprocess_glyphs */
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HB_OT_SHAPE_NORMALIZATION_MODE_COMPOSED_DIACRITICS_NO_SHORT_CIRCUIT,
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nullptr, /* decompose */
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nullptr, /* compose */
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setup_masks_myanmar,
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HB_TAG_NONE, /* gpos_tag */
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nullptr, /* reorder_marks */
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HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_EARLY,
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false, /* fallback_position */
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};
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/* Ugly Zawgyi encoding.
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* Disable all auto processing.
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* https://github.com/harfbuzz/harfbuzz/issues/1162 */
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const hb_ot_complex_shaper_t _hb_ot_complex_shaper_myanmar_zawgyi =
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{
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nullptr, /* collect_features */
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nullptr, /* override_features */
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nullptr, /* data_create */
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nullptr, /* data_destroy */
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nullptr, /* preprocess_text */
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nullptr, /* postprocess_glyphs */
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HB_OT_SHAPE_NORMALIZATION_MODE_NONE,
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nullptr, /* decompose */
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nullptr, /* compose */
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nullptr, /* setup_masks */
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HB_TAG_NONE, /* gpos_tag */
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nullptr, /* reorder_marks */
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HB_OT_SHAPE_ZERO_WIDTH_MARKS_NONE,
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false, /* fallback_position */
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};
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#endif
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