589 lines
16 KiB
C++
589 lines
16 KiB
C++
/*
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* Copyright © 2015 Mozilla Foundation.
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* Copyright © 2015 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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* Mozilla Author(s): Jonathan Kew
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* Google Author(s): Behdad Esfahbod
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*/
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#include "hb-ot-shape-complex-use-private.hh"
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#include "hb-ot-shape-complex-arabic-private.hh"
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/* buffer var allocations */
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#define use_category() complex_var_u8_0()
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/*
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* Universal Shaping Engine.
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* https://www.microsoft.com/typography/OpenTypeDev/USE/intro.htm
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*/
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static const hb_tag_t
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basic_features[] =
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{
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/*
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* Basic features.
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* These features are applied all at once, before reordering.
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*/
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HB_TAG('r','k','r','f'),
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HB_TAG('a','b','v','f'),
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HB_TAG('b','l','w','f'),
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HB_TAG('h','a','l','f'),
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HB_TAG('p','s','t','f'),
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HB_TAG('v','a','t','u'),
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HB_TAG('c','j','c','t'),
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};
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static const hb_tag_t
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arabic_features[] =
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{
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HB_TAG('i','s','o','l'),
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HB_TAG('i','n','i','t'),
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HB_TAG('m','e','d','i'),
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HB_TAG('f','i','n','a'),
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/* The spec doesn't specify these but we apply anyway, since our Arabic shaper
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* does. These are only used in Syriac spec. */
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HB_TAG('m','e','d','2'),
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HB_TAG('f','i','n','2'),
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HB_TAG('f','i','n','3'),
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};
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/* Same order as arabic_features. Don't need Syriac stuff.*/
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enum joining_form_t {
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ISOL,
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INIT,
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MEDI,
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FINA,
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_NONE
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};
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static const hb_tag_t
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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 reordering.
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*/
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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('h','a','l','n'),
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HB_TAG('p','r','e','s'),
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HB_TAG('p','s','t','s'),
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/* Positioning features, though we don't care about the types. */
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HB_TAG('d','i','s','t'),
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HB_TAG('a','b','v','m'),
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HB_TAG('b','l','w','m'),
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};
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static void
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setup_syllables (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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clear_substitution_flags (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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record_rphf (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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record_pref (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 (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_use (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);
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/* "Default glyph pre-processing group" */
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map->add_global_bool_feature (HB_TAG('l','o','c','l'));
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map->add_global_bool_feature (HB_TAG('c','c','m','p'));
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map->add_global_bool_feature (HB_TAG('n','u','k','t'));
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map->add_global_bool_feature (HB_TAG('a','k','h','n'));
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/* "Reordering group" */
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map->add_gsub_pause (clear_substitution_flags);
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map->add_feature (HB_TAG('r','p','h','f'), 1, F_MANUAL_ZWJ);
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map->add_gsub_pause (record_rphf);
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map->add_gsub_pause (clear_substitution_flags);
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map->add_feature (HB_TAG('p','r','e','f'), 1, F_GLOBAL | F_MANUAL_ZWJ);
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map->add_gsub_pause (record_pref);
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/* "Orthographic unit shaping group" */
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for (unsigned int i = 0; i < ARRAY_LENGTH (basic_features); i++)
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map->add_feature (basic_features[i], 1, F_GLOBAL | F_MANUAL_ZWJ);
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map->add_gsub_pause (reorder);
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/* "Topographical features" */
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for (unsigned int i = 0; i < ARRAY_LENGTH (arabic_features); i++)
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map->add_feature (arabic_features[i], 1, F_NONE);
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map->add_gsub_pause (NULL);
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/* "Standard typographic presentation" and "Positional feature application" */
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for (unsigned int i = 0; i < ARRAY_LENGTH (other_features); i++)
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map->add_feature (other_features[i], 1, F_GLOBAL | F_MANUAL_ZWJ);
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}
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struct use_shape_plan_t
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{
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ASSERT_POD ();
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hb_mask_t rphf_mask;
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arabic_shape_plan_t *arabic_plan;
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};
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static bool
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has_arabic_joining (hb_script_t script)
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{
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/* List of scripts that have data in arabic-table. */
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switch ((int) script)
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{
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/* Unicode-1.1 additions */
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case HB_SCRIPT_ARABIC:
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/* Unicode-3.0 additions */
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case HB_SCRIPT_MONGOLIAN:
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case HB_SCRIPT_SYRIAC:
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/* Unicode-5.0 additions */
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case HB_SCRIPT_NKO:
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case HB_SCRIPT_PHAGS_PA:
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/* Unicode-6.0 additions */
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case HB_SCRIPT_MANDAIC:
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/* Unicode-7.0 additions */
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case HB_SCRIPT_MANICHAEAN:
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case HB_SCRIPT_PSALTER_PAHLAVI:
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return true;
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default:
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return false;
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}
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}
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static void *
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data_create_use (const hb_ot_shape_plan_t *plan)
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{
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use_shape_plan_t *use_plan = (use_shape_plan_t *) calloc (1, sizeof (use_shape_plan_t));
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if (unlikely (!use_plan))
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return NULL;
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use_plan->rphf_mask = plan->map.get_1_mask (HB_TAG('r','p','h','f'));
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if (has_arabic_joining (plan->props.script))
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{
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use_plan->arabic_plan = (arabic_shape_plan_t *) data_create_arabic (plan);
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if (unlikely (!use_plan->arabic_plan))
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{
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free (use_plan);
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return NULL;
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}
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}
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return use_plan;
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}
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static void
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data_destroy_use (void *data)
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{
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use_shape_plan_t *use_plan = (use_shape_plan_t *) data;
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if (use_plan->arabic_plan)
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data_destroy_arabic (use_plan->arabic_plan);
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free (data);
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}
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enum syllable_type_t {
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independent_cluster,
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virama_terminated_cluster,
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consonant_cluster,
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vowel_cluster,
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number_joiner_terminated_cluster,
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numeral_cluster,
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symbol_cluster,
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broken_cluster,
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};
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#include "hb-ot-shape-complex-use-machine.hh"
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static void
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setup_masks_use (const hb_ot_shape_plan_t *plan,
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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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const use_shape_plan_t *use_plan = (const use_shape_plan_t *) plan->data;
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/* Do this before allocating use_category(). */
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if (use_plan->arabic_plan)
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{
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setup_masks_arabic_plan (use_plan->arabic_plan, buffer, plan->props.script);
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}
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HB_BUFFER_ALLOCATE_VAR (buffer, use_category);
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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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info[i].use_category() = hb_use_get_categories (info[i].codepoint);
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}
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static void
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setup_rphf_mask (const hb_ot_shape_plan_t *plan,
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hb_buffer_t *buffer)
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{
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const use_shape_plan_t *use_plan = (const use_shape_plan_t *) plan->data;
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hb_mask_t mask = use_plan->rphf_mask;
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if (!mask) return;
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hb_glyph_info_t *info = buffer->info;
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foreach_syllable (buffer, start, end)
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{
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unsigned int limit = info[start].use_category() == USE_R ? 1 : MIN (3u, end - start);
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for (unsigned int i = start; i < start + limit; i++)
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info[i].mask |= mask;
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}
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}
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static void
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setup_topographical_masks (const hb_ot_shape_plan_t *plan,
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hb_buffer_t *buffer)
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{
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const use_shape_plan_t *use_plan = (const use_shape_plan_t *) plan->data;
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if (use_plan->arabic_plan)
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return;
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ASSERT_STATIC (INIT < 4 && ISOL < 4 && MEDI < 4 && FINA < 4);
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hb_mask_t masks[4], all_masks = 0;
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for (unsigned int i = 0; i < 4; i++)
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{
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masks[i] = plan->map.get_1_mask (arabic_features[i]);
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if (masks[i] == plan->map.get_global_mask ())
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masks[i] = 0;
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all_masks |= masks[i];
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}
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if (!all_masks)
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return;
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hb_mask_t other_masks = ~all_masks;
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unsigned int last_start = 0;
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joining_form_t last_form = _NONE;
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hb_glyph_info_t *info = buffer->info;
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foreach_syllable (buffer, start, end)
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{
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syllable_type_t syllable_type = (syllable_type_t) (info[start].syllable() & 0x0F);
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switch (syllable_type)
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{
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case independent_cluster:
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case symbol_cluster:
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/* These don't join. Nothing to do. */
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last_form = _NONE;
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break;
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case virama_terminated_cluster:
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case consonant_cluster:
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case vowel_cluster:
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case number_joiner_terminated_cluster:
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case numeral_cluster:
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case broken_cluster:
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bool join = last_form == FINA || last_form == ISOL;
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if (join)
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{
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/* Fixup previous syllable's form. */
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last_form = last_form == FINA ? MEDI : INIT;
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for (unsigned int i = last_start; i < start; i++)
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info[i].mask = (info[i].mask & other_masks) | masks[last_form];
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}
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/* Form for this syllable. */
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last_form = join ? FINA : ISOL;
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for (unsigned int i = start; i < end; i++)
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info[i].mask = (info[i].mask & other_masks) | masks[last_form];
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break;
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}
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last_start = start;
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}
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}
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static void
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setup_syllables (const hb_ot_shape_plan_t *plan,
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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 (buffer);
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setup_rphf_mask (plan, buffer);
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setup_topographical_masks (plan, buffer);
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}
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static void
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clear_substitution_flags (const hb_ot_shape_plan_t *plan,
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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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hb_glyph_info_t *info = buffer->info;
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unsigned int count = buffer->len;
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for (unsigned int i = 0; i < count; i++)
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_hb_glyph_info_clear_substituted (&info[i]);
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}
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static void
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record_rphf (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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const use_shape_plan_t *use_plan = (const use_shape_plan_t *) plan->data;
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hb_mask_t mask = use_plan->rphf_mask;
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if (!mask) return;
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hb_glyph_info_t *info = buffer->info;
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foreach_syllable (buffer, start, end)
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{
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/* Mark a substituted repha as USE_R. */
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for (unsigned int i = start; i < end && (info[i].mask & mask); i++)
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if (_hb_glyph_info_substituted (&info[i]))
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{
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info[i].use_category() = USE_R;
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break;
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}
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}
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}
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static void
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record_pref (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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hb_glyph_info_t *info = buffer->info;
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foreach_syllable (buffer, start, end)
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{
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/* Mark a substituted pref as VPre, as they behave the same way. */
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for (unsigned int i = start; i < end; i++)
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if (_hb_glyph_info_substituted (&info[i]))
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{
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info[i].use_category() = USE_VPre;
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break;
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}
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}
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}
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static inline bool
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is_halant (const hb_glyph_info_t &info)
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{
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return info.use_category() == USE_H && !_hb_glyph_info_ligated (&info);
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}
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static void
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reorder_syllable (hb_buffer_t *buffer, unsigned int start, unsigned int end)
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{
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syllable_type_t syllable_type = (syllable_type_t) (buffer->info[start].syllable() & 0x0F);
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/* Only a few syllable types need reordering. */
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if (unlikely (!(FLAG_SAFE (syllable_type) &
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(FLAG (virama_terminated_cluster) |
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FLAG (consonant_cluster) |
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FLAG (vowel_cluster) |
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FLAG (broken_cluster) |
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0))))
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return;
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hb_glyph_info_t *info = buffer->info;
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#define BASE_FLAGS (FLAG (USE_B) | FLAG (USE_GB) | FLAG (USE_IV))
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/* Move things forward. */
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if (info[start].use_category() == USE_R && end - start > 1)
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{
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/* Got a repha. Reorder it to after first base, before first halant. */
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for (unsigned int i = start + 1; i < end; i++)
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if ((FLAG_UNSAFE (info[i].use_category()) & (BASE_FLAGS)) || is_halant (info[i]))
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{
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/* If we hit a halant, move before it; otherwise it's a base: move to it's
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* place, and shift things in between backward. */
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if (is_halant (info[i]))
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i--;
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buffer->merge_clusters (start, i + 1);
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hb_glyph_info_t t = info[start];
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memmove (&info[start], &info[start + 1], (i - start) * sizeof (info[0]));
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info[i] = t;
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break;
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}
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}
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/* Move things back. */
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unsigned int j = end;
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for (unsigned int i = start; i < end; i++)
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{
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uint32_t flag = FLAG_UNSAFE (info[i].use_category());
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if ((flag & (BASE_FLAGS)) || is_halant (info[i]))
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{
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/* If we hit a halant, move after it; otherwise it's a base: move to it's
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* place, and shift things in between backward. */
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if (is_halant (info[i]))
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j = i + 1;
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else
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j = i;
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}
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else if (((flag) & (FLAG (USE_VPre) | FLAG (USE_VMPre))) &&
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/* Only move the first component of a MultipleSubst. */
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0 == _hb_glyph_info_get_lig_comp (&info[i]) &&
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j < i)
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{
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buffer->merge_clusters (j, i + 1);
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hb_glyph_info_t t = info[i];
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memmove (&info[j + 1], &info[j], (i - j) * sizeof (info[0]));
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info[j] = t;
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}
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}
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}
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static inline void
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insert_dotted_circles (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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/* Note: This loop is extra overhead, but should not be measurable. */
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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) == 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_glyph_info_t dottedcircle = {0};
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if (!font->get_glyph (0x25CCu, 0, &dottedcircle.codepoint))
|
|
return;
|
|
dottedcircle.use_category() = hb_use_get_categories (0x25CC);
|
|
|
|
buffer->clear_output ();
|
|
|
|
buffer->idx = 0;
|
|
unsigned int last_syllable = 0;
|
|
while (buffer->idx < buffer->len && !buffer->in_error)
|
|
{
|
|
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 ginfo = dottedcircle;
|
|
ginfo.cluster = buffer->cur().cluster;
|
|
ginfo.mask = buffer->cur().mask;
|
|
ginfo.syllable() = buffer->cur().syllable();
|
|
/* TODO Set glyph_props? */
|
|
|
|
/* Insert dottedcircle after possible Repha. */
|
|
while (buffer->idx < buffer->len &&
|
|
last_syllable == buffer->cur().syllable() &&
|
|
buffer->cur().use_category() == USE_R)
|
|
buffer->next_glyph ();
|
|
|
|
buffer->output_info (ginfo);
|
|
}
|
|
else
|
|
buffer->next_glyph ();
|
|
}
|
|
|
|
buffer->swap_buffers ();
|
|
}
|
|
|
|
static void
|
|
reorder (const hb_ot_shape_plan_t *plan,
|
|
hb_font_t *font,
|
|
hb_buffer_t *buffer)
|
|
{
|
|
insert_dotted_circles (plan, font, buffer);
|
|
|
|
hb_glyph_info_t *info = buffer->info;
|
|
|
|
foreach_syllable (buffer, start, end)
|
|
reorder_syllable (buffer, start, end);
|
|
|
|
/* Zero syllables now... */
|
|
unsigned int count = buffer->len;
|
|
for (unsigned int i = 0; i < count; i++)
|
|
info[i].syllable() = 0;
|
|
|
|
HB_BUFFER_DEALLOCATE_VAR (buffer, use_category);
|
|
}
|
|
|
|
static bool
|
|
compose_use (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;
|
|
|
|
return (bool)c->unicode->compose (a, b, ab);
|
|
}
|
|
|
|
|
|
const hb_ot_complex_shaper_t _hb_ot_complex_shaper_use =
|
|
{
|
|
"use",
|
|
collect_features_use,
|
|
NULL, /* override_features */
|
|
data_create_use,
|
|
data_destroy_use,
|
|
NULL, /* preprocess_text */
|
|
NULL, /* postprocess_glyphs */
|
|
HB_OT_SHAPE_NORMALIZATION_MODE_COMPOSED_DIACRITICS_NO_SHORT_CIRCUIT,
|
|
NULL, /* decompose */
|
|
compose_use,
|
|
setup_masks_use,
|
|
HB_OT_SHAPE_ZERO_WIDTH_MARKS_NONE,
|
|
false, /* fallback_position */
|
|
};
|