1282 lines
37 KiB
C++
1282 lines
37 KiB
C++
/*
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* Copyright © 2009,2010 Red Hat, Inc.
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* Copyright © 2010,2011,2012 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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* Red Hat Author(s): Behdad Esfahbod
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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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#ifdef HB_NO_OT_LAYOUT
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#error "Cannot compile 'ot' shaper with HB_NO_OT_LAYOUT."
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#endif
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#include "hb-shaper-impl.hh"
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#include "hb-ot-shape.hh"
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#include "hb-ot-shape-complex.hh"
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#include "hb-ot-shape-fallback.hh"
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#include "hb-ot-shape-normalize.hh"
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#include "hb-ot-face.hh"
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#include "hb-set.hh"
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#include "hb-aat-layout.hh"
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#ifndef HB_NO_AAT_SHAPE
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static inline bool
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_hb_apply_morx (hb_face_t *face, const hb_segment_properties_t *props)
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{
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/* https://github.com/harfbuzz/harfbuzz/issues/2124 */
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return hb_aat_layout_has_substitution (face) &&
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(HB_DIRECTION_IS_HORIZONTAL (props->direction) || !hb_ot_layout_has_substitution (face));
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}
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#endif
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/**
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* SECTION:hb-ot-shape
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* @title: hb-ot-shape
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* @short_description: OpenType shaping support
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* @include: hb-ot.h
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*
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* Support functions for OpenType shaping related queries.
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**/
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static void
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hb_ot_shape_collect_features (hb_ot_shape_planner_t *planner,
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const hb_feature_t *user_features,
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unsigned int num_user_features);
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hb_ot_shape_planner_t::hb_ot_shape_planner_t (hb_face_t *face,
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const hb_segment_properties_t *props) :
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face (face),
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props (*props),
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map (face, props),
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aat_map (face, props)
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#ifndef HB_NO_AAT_SHAPE
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, apply_morx (_hb_apply_morx (face, props))
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#endif
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{
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shaper = hb_ot_shape_complex_categorize (this);
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script_zero_marks = shaper->zero_width_marks != HB_OT_SHAPE_ZERO_WIDTH_MARKS_NONE;
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script_fallback_mark_positioning = shaper->fallback_position;
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/* https://github.com/harfbuzz/harfbuzz/issues/1528 */
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if (apply_morx && shaper != &_hb_ot_complex_shaper_default)
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shaper = &_hb_ot_complex_shaper_dumber;
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}
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void
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hb_ot_shape_planner_t::compile (hb_ot_shape_plan_t &plan,
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const hb_ot_shape_plan_key_t &key)
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{
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plan.props = props;
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plan.shaper = shaper;
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map.compile (plan.map, key);
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#ifndef HB_NO_AAT_SHAPE
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if (apply_morx)
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aat_map.compile (plan.aat_map);
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#endif
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#ifndef HB_NO_OT_SHAPE_FRACTIONS
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plan.frac_mask = plan.map.get_1_mask (HB_TAG ('f','r','a','c'));
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plan.numr_mask = plan.map.get_1_mask (HB_TAG ('n','u','m','r'));
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plan.dnom_mask = plan.map.get_1_mask (HB_TAG ('d','n','o','m'));
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plan.has_frac = plan.frac_mask || (plan.numr_mask && plan.dnom_mask);
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#endif
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plan.rtlm_mask = plan.map.get_1_mask (HB_TAG ('r','t','l','m'));
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plan.has_vert = !!plan.map.get_1_mask (HB_TAG ('v','e','r','t'));
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hb_tag_t kern_tag = HB_DIRECTION_IS_HORIZONTAL (props.direction) ?
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HB_TAG ('k','e','r','n') : HB_TAG ('v','k','r','n');
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#ifndef HB_NO_OT_KERN
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plan.kern_mask = plan.map.get_mask (kern_tag);
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plan.requested_kerning = !!plan.kern_mask;
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#endif
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#ifndef HB_NO_AAT_SHAPE
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plan.trak_mask = plan.map.get_mask (HB_TAG ('t','r','a','k'));
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plan.requested_tracking = !!plan.trak_mask;
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#endif
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bool has_gpos_kern = plan.map.get_feature_index (1, kern_tag) != HB_OT_LAYOUT_NO_FEATURE_INDEX;
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bool disable_gpos = plan.shaper->gpos_tag &&
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plan.shaper->gpos_tag != plan.map.chosen_script[1];
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/*
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* Decide who provides glyph classes. GDEF or Unicode.
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*/
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if (!hb_ot_layout_has_glyph_classes (face))
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plan.fallback_glyph_classes = true;
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/*
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* Decide who does substitutions. GSUB, morx, or fallback.
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*/
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#ifndef HB_NO_AAT_SHAPE
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plan.apply_morx = apply_morx;
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#endif
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/*
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* Decide who does positioning. GPOS, kerx, kern, or fallback.
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*/
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#ifndef HB_NO_AAT_SHAPE
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bool has_kerx = hb_aat_layout_has_positioning (face);
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bool has_gsub = !apply_morx && hb_ot_layout_has_substitution (face);
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#endif
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bool has_gpos = !disable_gpos && hb_ot_layout_has_positioning (face);
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if (false)
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;
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#ifndef HB_NO_AAT_SHAPE
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/* Prefer GPOS over kerx if GSUB is present;
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* https://github.com/harfbuzz/harfbuzz/issues/3008 */
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else if (has_kerx && !(has_gsub && has_gpos))
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plan.apply_kerx = true;
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#endif
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else if (has_gpos)
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plan.apply_gpos = true;
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if (!plan.apply_kerx && (!has_gpos_kern || !plan.apply_gpos))
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{
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#ifndef HB_NO_AAT_SHAPE
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if (has_kerx)
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plan.apply_kerx = true;
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else
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#endif
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#ifndef HB_NO_OT_KERN
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if (hb_ot_layout_has_kerning (face))
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plan.apply_kern = true;
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#endif
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}
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plan.apply_fallback_kern = !(plan.apply_gpos || plan.apply_kerx || plan.apply_kern);
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plan.zero_marks = script_zero_marks &&
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!plan.apply_kerx &&
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(!plan.apply_kern
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#ifndef HB_NO_OT_KERN
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|| !hb_ot_layout_has_machine_kerning (face)
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#endif
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);
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plan.has_gpos_mark = !!plan.map.get_1_mask (HB_TAG ('m','a','r','k'));
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plan.adjust_mark_positioning_when_zeroing = !plan.apply_gpos &&
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!plan.apply_kerx &&
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(!plan.apply_kern
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#ifndef HB_NO_OT_KERN
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|| !hb_ot_layout_has_cross_kerning (face)
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#endif
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);
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plan.fallback_mark_positioning = plan.adjust_mark_positioning_when_zeroing &&
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script_fallback_mark_positioning;
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#ifndef HB_NO_AAT_SHAPE
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/* If we're using morx shaping, we cancel mark position adjustment because
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Apple Color Emoji assumes this will NOT be done when forming emoji sequences;
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https://github.com/harfbuzz/harfbuzz/issues/2967. */
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if (plan.apply_morx)
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plan.adjust_mark_positioning_when_zeroing = false;
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/* Currently we always apply trak. */
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plan.apply_trak = plan.requested_tracking && hb_aat_layout_has_tracking (face);
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#endif
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}
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bool
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hb_ot_shape_plan_t::init0 (hb_face_t *face,
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const hb_shape_plan_key_t *key)
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{
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map.init ();
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#ifndef HB_NO_AAT_SHAPE
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aat_map.init ();
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#endif
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hb_ot_shape_planner_t planner (face,
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&key->props);
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hb_ot_shape_collect_features (&planner,
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key->user_features,
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key->num_user_features);
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planner.compile (*this, key->ot);
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if (shaper->data_create)
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{
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data = shaper->data_create (this);
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if (unlikely (!data))
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{
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map.fini ();
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#ifndef HB_NO_AAT_SHAPE
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aat_map.fini ();
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#endif
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return false;
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}
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}
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return true;
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}
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void
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hb_ot_shape_plan_t::fini ()
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{
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if (shaper->data_destroy)
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shaper->data_destroy (const_cast<void *> (data));
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map.fini ();
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#ifndef HB_NO_AAT_SHAPE
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aat_map.fini ();
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#endif
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}
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void
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hb_ot_shape_plan_t::substitute (hb_font_t *font,
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hb_buffer_t *buffer) const
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{
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#ifndef HB_NO_AAT_SHAPE
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if (unlikely (apply_morx))
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hb_aat_layout_substitute (this, font, buffer);
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else
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#endif
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map.substitute (this, font, buffer);
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}
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void
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hb_ot_shape_plan_t::position (hb_font_t *font,
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hb_buffer_t *buffer) const
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{
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if (this->apply_gpos)
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map.position (this, font, buffer);
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#ifndef HB_NO_AAT_SHAPE
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else if (this->apply_kerx)
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hb_aat_layout_position (this, font, buffer);
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#endif
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#ifndef HB_NO_OT_KERN
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if (this->apply_kern)
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hb_ot_layout_kern (this, font, buffer);
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#endif
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else if (this->apply_fallback_kern)
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_hb_ot_shape_fallback_kern (this, font, buffer);
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#ifndef HB_NO_AAT_SHAPE
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if (this->apply_trak)
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hb_aat_layout_track (this, font, buffer);
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#endif
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}
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static const hb_ot_map_feature_t
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common_features[] =
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{
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{HB_TAG('a','b','v','m'), F_GLOBAL},
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{HB_TAG('b','l','w','m'), F_GLOBAL},
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{HB_TAG('c','c','m','p'), F_GLOBAL},
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{HB_TAG('l','o','c','l'), F_GLOBAL},
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{HB_TAG('m','a','r','k'), F_GLOBAL_MANUAL_JOINERS},
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{HB_TAG('m','k','m','k'), F_GLOBAL_MANUAL_JOINERS},
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{HB_TAG('r','l','i','g'), F_GLOBAL},
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};
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static const hb_ot_map_feature_t
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horizontal_features[] =
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{
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{HB_TAG('c','a','l','t'), F_GLOBAL},
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{HB_TAG('c','l','i','g'), F_GLOBAL},
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{HB_TAG('c','u','r','s'), F_GLOBAL},
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{HB_TAG('d','i','s','t'), F_GLOBAL},
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{HB_TAG('k','e','r','n'), F_GLOBAL_HAS_FALLBACK},
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{HB_TAG('l','i','g','a'), F_GLOBAL},
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{HB_TAG('r','c','l','t'), F_GLOBAL},
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};
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static void
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hb_ot_shape_collect_features (hb_ot_shape_planner_t *planner,
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const hb_feature_t *user_features,
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unsigned int num_user_features)
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{
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hb_ot_map_builder_t *map = &planner->map;
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map->enable_feature (HB_TAG('r','v','r','n'));
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map->add_gsub_pause (nullptr);
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switch (planner->props.direction)
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{
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case HB_DIRECTION_LTR:
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map->enable_feature (HB_TAG ('l','t','r','a'));
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map->enable_feature (HB_TAG ('l','t','r','m'));
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break;
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case HB_DIRECTION_RTL:
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map->enable_feature (HB_TAG ('r','t','l','a'));
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map->add_feature (HB_TAG ('r','t','l','m'));
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break;
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case HB_DIRECTION_TTB:
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case HB_DIRECTION_BTT:
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case HB_DIRECTION_INVALID:
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default:
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break;
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}
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#ifndef HB_NO_OT_SHAPE_FRACTIONS
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/* Automatic fractions. */
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map->add_feature (HB_TAG ('f','r','a','c'));
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map->add_feature (HB_TAG ('n','u','m','r'));
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map->add_feature (HB_TAG ('d','n','o','m'));
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#endif
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/* Random! */
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map->enable_feature (HB_TAG ('r','a','n','d'), F_RANDOM, HB_OT_MAP_MAX_VALUE);
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#ifndef HB_NO_AAT_SHAPE
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/* Tracking. We enable dummy feature here just to allow disabling
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* AAT 'trak' table using features.
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* https://github.com/harfbuzz/harfbuzz/issues/1303 */
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map->enable_feature (HB_TAG ('t','r','a','k'), F_HAS_FALLBACK);
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#endif
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map->enable_feature (HB_TAG ('H','a','r','f')); /* Considered required. */
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map->enable_feature (HB_TAG ('H','A','R','F')); /* Considered discretionary. */
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if (planner->shaper->collect_features)
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planner->shaper->collect_features (planner);
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map->enable_feature (HB_TAG ('B','u','z','z')); /* Considered required. */
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map->enable_feature (HB_TAG ('B','U','Z','Z')); /* Considered discretionary. */
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for (unsigned int i = 0; i < ARRAY_LENGTH (common_features); i++)
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map->add_feature (common_features[i]);
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if (HB_DIRECTION_IS_HORIZONTAL (planner->props.direction))
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for (unsigned int i = 0; i < ARRAY_LENGTH (horizontal_features); i++)
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map->add_feature (horizontal_features[i]);
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else
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{
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/* We only apply `vert` feature. See:
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* https://github.com/harfbuzz/harfbuzz/commit/d71c0df2d17f4590d5611239577a6cb532c26528
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* https://lists.freedesktop.org/archives/harfbuzz/2013-August/003490.html */
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/* We really want to find a 'vert' feature if there's any in the font, no
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* matter which script/langsys it is listed (or not) under.
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* See various bugs referenced from:
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* https://github.com/harfbuzz/harfbuzz/issues/63 */
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map->enable_feature (HB_TAG ('v','e','r','t'), F_GLOBAL_SEARCH);
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}
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for (unsigned int i = 0; i < num_user_features; i++)
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{
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const hb_feature_t *feature = &user_features[i];
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map->add_feature (feature->tag,
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(feature->start == HB_FEATURE_GLOBAL_START &&
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feature->end == HB_FEATURE_GLOBAL_END) ? F_GLOBAL : F_NONE,
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feature->value);
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}
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#ifndef HB_NO_AAT_SHAPE
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if (planner->apply_morx)
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{
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hb_aat_map_builder_t *aat_map = &planner->aat_map;
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for (unsigned int i = 0; i < num_user_features; i++)
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{
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const hb_feature_t *feature = &user_features[i];
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aat_map->add_feature (feature->tag, feature->value);
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}
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}
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#endif
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if (planner->shaper->override_features)
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planner->shaper->override_features (planner);
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}
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/*
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* shaper face data
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*/
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struct hb_ot_face_data_t {};
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hb_ot_face_data_t *
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_hb_ot_shaper_face_data_create (hb_face_t *face)
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{
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return (hb_ot_face_data_t *) HB_SHAPER_DATA_SUCCEEDED;
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}
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void
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_hb_ot_shaper_face_data_destroy (hb_ot_face_data_t *data)
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{
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}
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|
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/*
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* shaper font data
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*/
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struct hb_ot_font_data_t {};
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hb_ot_font_data_t *
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_hb_ot_shaper_font_data_create (hb_font_t *font HB_UNUSED)
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{
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return (hb_ot_font_data_t *) HB_SHAPER_DATA_SUCCEEDED;
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}
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void
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_hb_ot_shaper_font_data_destroy (hb_ot_font_data_t *data HB_UNUSED)
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{
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}
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|
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/*
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* shaper
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*/
|
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struct hb_ot_shape_context_t
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{
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hb_ot_shape_plan_t *plan;
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hb_font_t *font;
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hb_face_t *face;
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hb_buffer_t *buffer;
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const hb_feature_t *user_features;
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unsigned int num_user_features;
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/* Transient stuff */
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hb_direction_t target_direction;
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};
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|
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/* Main shaper */
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|
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/* Prepare */
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static void
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hb_set_unicode_props (hb_buffer_t *buffer)
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{
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/* Implement enough of Unicode Graphemes here that shaping
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* in reverse-direction wouldn't break graphemes. Namely,
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* we mark all marks and ZWJ and ZWJ,Extended_Pictographic
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* sequences as continuations. The foreach_grapheme()
|
|
* macro uses this bit.
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*
|
|
* https://www.unicode.org/reports/tr29/#Regex_Definitions
|
|
*/
|
|
unsigned int count = buffer->len;
|
|
hb_glyph_info_t *info = buffer->info;
|
|
for (unsigned int i = 0; i < count; i++)
|
|
{
|
|
_hb_glyph_info_set_unicode_props (&info[i], buffer);
|
|
|
|
/* Marks are already set as continuation by the above line.
|
|
* Handle Emoji_Modifier and ZWJ-continuation. */
|
|
if (unlikely (_hb_glyph_info_get_general_category (&info[i]) == HB_UNICODE_GENERAL_CATEGORY_MODIFIER_SYMBOL &&
|
|
hb_in_range<hb_codepoint_t> (info[i].codepoint, 0x1F3FBu, 0x1F3FFu)))
|
|
{
|
|
_hb_glyph_info_set_continuation (&info[i]);
|
|
}
|
|
/* Regional_Indicators are hairy as hell...
|
|
* https://github.com/harfbuzz/harfbuzz/issues/2265 */
|
|
else if (unlikely (i && hb_in_range<hb_codepoint_t> (info[i].codepoint, 0x1F1E6u, 0x1F1FFu)))
|
|
{
|
|
if (hb_in_range<hb_codepoint_t> (info[i - 1].codepoint, 0x1F1E6u, 0x1F1FFu) &&
|
|
!_hb_glyph_info_is_continuation (&info[i - 1]))
|
|
_hb_glyph_info_set_continuation (&info[i]);
|
|
}
|
|
#ifndef HB_NO_EMOJI_SEQUENCES
|
|
else if (unlikely (_hb_glyph_info_is_zwj (&info[i])))
|
|
{
|
|
_hb_glyph_info_set_continuation (&info[i]);
|
|
if (i + 1 < count &&
|
|
_hb_unicode_is_emoji_Extended_Pictographic (info[i + 1].codepoint))
|
|
{
|
|
i++;
|
|
_hb_glyph_info_set_unicode_props (&info[i], buffer);
|
|
_hb_glyph_info_set_continuation (&info[i]);
|
|
}
|
|
}
|
|
#endif
|
|
/* Or part of the Other_Grapheme_Extend that is not marks.
|
|
* As of Unicode 11 that is just:
|
|
*
|
|
* 200C ; Other_Grapheme_Extend # Cf ZERO WIDTH NON-JOINER
|
|
* FF9E..FF9F ; Other_Grapheme_Extend # Lm [2] HALFWIDTH KATAKANA VOICED SOUND MARK..HALFWIDTH KATAKANA SEMI-VOICED SOUND MARK
|
|
* E0020..E007F ; Other_Grapheme_Extend # Cf [96] TAG SPACE..CANCEL TAG
|
|
*
|
|
* ZWNJ is special, we don't want to merge it as there's no need, and keeping
|
|
* it separate results in more granular clusters. Ignore Katakana for now.
|
|
* Tags are used for Emoji sub-region flag sequences:
|
|
* https://github.com/harfbuzz/harfbuzz/issues/1556
|
|
*/
|
|
else if (unlikely (hb_in_range<hb_codepoint_t> (info[i].codepoint, 0xE0020u, 0xE007Fu)))
|
|
_hb_glyph_info_set_continuation (&info[i]);
|
|
}
|
|
}
|
|
|
|
static void
|
|
hb_insert_dotted_circle (hb_buffer_t *buffer, hb_font_t *font)
|
|
{
|
|
if (unlikely (buffer->flags & HB_BUFFER_FLAG_DO_NOT_INSERT_DOTTED_CIRCLE))
|
|
return;
|
|
|
|
if (!(buffer->flags & HB_BUFFER_FLAG_BOT) ||
|
|
buffer->context_len[0] ||
|
|
!_hb_glyph_info_is_unicode_mark (&buffer->info[0]))
|
|
return;
|
|
|
|
if (!font->has_glyph (0x25CCu))
|
|
return;
|
|
|
|
hb_glyph_info_t dottedcircle = {0};
|
|
dottedcircle.codepoint = 0x25CCu;
|
|
_hb_glyph_info_set_unicode_props (&dottedcircle, buffer);
|
|
|
|
buffer->clear_output ();
|
|
|
|
buffer->idx = 0;
|
|
hb_glyph_info_t info = dottedcircle;
|
|
info.cluster = buffer->cur().cluster;
|
|
info.mask = buffer->cur().mask;
|
|
(void) buffer->output_info (info);
|
|
|
|
buffer->sync ();
|
|
}
|
|
|
|
static void
|
|
hb_form_clusters (hb_buffer_t *buffer)
|
|
{
|
|
if (!(buffer->scratch_flags & HB_BUFFER_SCRATCH_FLAG_HAS_NON_ASCII))
|
|
return;
|
|
|
|
if (buffer->cluster_level == HB_BUFFER_CLUSTER_LEVEL_MONOTONE_GRAPHEMES)
|
|
foreach_grapheme (buffer, start, end)
|
|
buffer->merge_clusters (start, end);
|
|
else
|
|
foreach_grapheme (buffer, start, end)
|
|
buffer->unsafe_to_break (start, end);
|
|
}
|
|
|
|
static void
|
|
hb_ensure_native_direction (hb_buffer_t *buffer)
|
|
{
|
|
hb_direction_t direction = buffer->props.direction;
|
|
hb_direction_t horiz_dir = hb_script_get_horizontal_direction (buffer->props.script);
|
|
|
|
/* Numeric runs in natively-RTL scripts are actually native-LTR, so we reset
|
|
* the horiz_dir if the run contains at least one decimal-number char, and no
|
|
* letter chars (ideally we should be checking for chars with strong
|
|
* directionality but hb-unicode currently lacks bidi categories).
|
|
*
|
|
* This allows digit sequences in Arabic etc to be shaped in "native"
|
|
* direction, so that features like ligatures will work as intended.
|
|
*
|
|
* https://github.com/harfbuzz/harfbuzz/issues/501
|
|
*/
|
|
if (unlikely (horiz_dir == HB_DIRECTION_RTL && direction == HB_DIRECTION_LTR))
|
|
{
|
|
bool found_number = false, found_letter = false;
|
|
const auto* info = buffer->info;
|
|
const auto count = buffer->len;
|
|
for (unsigned i = 0; i < count; i++)
|
|
{
|
|
auto gc = _hb_glyph_info_get_general_category (&info[i]);
|
|
if (gc == HB_UNICODE_GENERAL_CATEGORY_DECIMAL_NUMBER)
|
|
found_number = true;
|
|
else if (HB_UNICODE_GENERAL_CATEGORY_IS_LETTER (gc))
|
|
{
|
|
found_letter = true;
|
|
break;
|
|
}
|
|
}
|
|
if (found_number && !found_letter)
|
|
horiz_dir = HB_DIRECTION_LTR;
|
|
}
|
|
|
|
/* TODO vertical:
|
|
* The only BTT vertical script is Ogham, but it's not clear to me whether OpenType
|
|
* Ogham fonts are supposed to be implemented BTT or not. Need to research that
|
|
* first. */
|
|
if ((HB_DIRECTION_IS_HORIZONTAL (direction) &&
|
|
direction != horiz_dir && horiz_dir != HB_DIRECTION_INVALID) ||
|
|
(HB_DIRECTION_IS_VERTICAL (direction) &&
|
|
direction != HB_DIRECTION_TTB))
|
|
{
|
|
_hb_ot_layout_reverse_graphemes (buffer);
|
|
buffer->props.direction = HB_DIRECTION_REVERSE (buffer->props.direction);
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Substitute
|
|
*/
|
|
|
|
#ifndef HB_NO_VERTICAL
|
|
static hb_codepoint_t
|
|
hb_vert_char_for (hb_codepoint_t u)
|
|
{
|
|
switch (u >> 8)
|
|
{
|
|
case 0x20: switch (u) {
|
|
case 0x2013u: return 0xfe32u; // EN DASH
|
|
case 0x2014u: return 0xfe31u; // EM DASH
|
|
case 0x2025u: return 0xfe30u; // TWO DOT LEADER
|
|
case 0x2026u: return 0xfe19u; // HORIZONTAL ELLIPSIS
|
|
} break;
|
|
case 0x30: switch (u) {
|
|
case 0x3001u: return 0xfe11u; // IDEOGRAPHIC COMMA
|
|
case 0x3002u: return 0xfe12u; // IDEOGRAPHIC FULL STOP
|
|
case 0x3008u: return 0xfe3fu; // LEFT ANGLE BRACKET
|
|
case 0x3009u: return 0xfe40u; // RIGHT ANGLE BRACKET
|
|
case 0x300au: return 0xfe3du; // LEFT DOUBLE ANGLE BRACKET
|
|
case 0x300bu: return 0xfe3eu; // RIGHT DOUBLE ANGLE BRACKET
|
|
case 0x300cu: return 0xfe41u; // LEFT CORNER BRACKET
|
|
case 0x300du: return 0xfe42u; // RIGHT CORNER BRACKET
|
|
case 0x300eu: return 0xfe43u; // LEFT WHITE CORNER BRACKET
|
|
case 0x300fu: return 0xfe44u; // RIGHT WHITE CORNER BRACKET
|
|
case 0x3010u: return 0xfe3bu; // LEFT BLACK LENTICULAR BRACKET
|
|
case 0x3011u: return 0xfe3cu; // RIGHT BLACK LENTICULAR BRACKET
|
|
case 0x3014u: return 0xfe39u; // LEFT TORTOISE SHELL BRACKET
|
|
case 0x3015u: return 0xfe3au; // RIGHT TORTOISE SHELL BRACKET
|
|
case 0x3016u: return 0xfe17u; // LEFT WHITE LENTICULAR BRACKET
|
|
case 0x3017u: return 0xfe18u; // RIGHT WHITE LENTICULAR BRACKET
|
|
} break;
|
|
case 0xfe: switch (u) {
|
|
case 0xfe4fu: return 0xfe34u; // WAVY LOW LINE
|
|
} break;
|
|
case 0xff: switch (u) {
|
|
case 0xff01u: return 0xfe15u; // FULLWIDTH EXCLAMATION MARK
|
|
case 0xff08u: return 0xfe35u; // FULLWIDTH LEFT PARENTHESIS
|
|
case 0xff09u: return 0xfe36u; // FULLWIDTH RIGHT PARENTHESIS
|
|
case 0xff0cu: return 0xfe10u; // FULLWIDTH COMMA
|
|
case 0xff1au: return 0xfe13u; // FULLWIDTH COLON
|
|
case 0xff1bu: return 0xfe14u; // FULLWIDTH SEMICOLON
|
|
case 0xff1fu: return 0xfe16u; // FULLWIDTH QUESTION MARK
|
|
case 0xff3bu: return 0xfe47u; // FULLWIDTH LEFT SQUARE BRACKET
|
|
case 0xff3du: return 0xfe48u; // FULLWIDTH RIGHT SQUARE BRACKET
|
|
case 0xff3fu: return 0xfe33u; // FULLWIDTH LOW LINE
|
|
case 0xff5bu: return 0xfe37u; // FULLWIDTH LEFT CURLY BRACKET
|
|
case 0xff5du: return 0xfe38u; // FULLWIDTH RIGHT CURLY BRACKET
|
|
} break;
|
|
}
|
|
|
|
return u;
|
|
}
|
|
#endif
|
|
|
|
static inline void
|
|
hb_ot_rotate_chars (const hb_ot_shape_context_t *c)
|
|
{
|
|
hb_buffer_t *buffer = c->buffer;
|
|
unsigned int count = buffer->len;
|
|
hb_glyph_info_t *info = buffer->info;
|
|
|
|
if (HB_DIRECTION_IS_BACKWARD (c->target_direction))
|
|
{
|
|
hb_unicode_funcs_t *unicode = buffer->unicode;
|
|
hb_mask_t rtlm_mask = c->plan->rtlm_mask;
|
|
|
|
for (unsigned int i = 0; i < count; i++) {
|
|
hb_codepoint_t codepoint = unicode->mirroring (info[i].codepoint);
|
|
if (unlikely (codepoint != info[i].codepoint && c->font->has_glyph (codepoint)))
|
|
info[i].codepoint = codepoint;
|
|
else
|
|
info[i].mask |= rtlm_mask;
|
|
}
|
|
}
|
|
|
|
#ifndef HB_NO_VERTICAL
|
|
if (HB_DIRECTION_IS_VERTICAL (c->target_direction) && !c->plan->has_vert)
|
|
{
|
|
for (unsigned int i = 0; i < count; i++) {
|
|
hb_codepoint_t codepoint = hb_vert_char_for (info[i].codepoint);
|
|
if (unlikely (codepoint != info[i].codepoint && c->font->has_glyph (codepoint)))
|
|
info[i].codepoint = codepoint;
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static inline void
|
|
hb_ot_shape_setup_masks_fraction (const hb_ot_shape_context_t *c)
|
|
{
|
|
#ifdef HB_NO_OT_SHAPE_FRACTIONS
|
|
return;
|
|
#endif
|
|
|
|
if (!(c->buffer->scratch_flags & HB_BUFFER_SCRATCH_FLAG_HAS_NON_ASCII) ||
|
|
!c->plan->has_frac)
|
|
return;
|
|
|
|
hb_buffer_t *buffer = c->buffer;
|
|
|
|
hb_mask_t pre_mask, post_mask;
|
|
if (HB_DIRECTION_IS_FORWARD (buffer->props.direction))
|
|
{
|
|
pre_mask = c->plan->numr_mask | c->plan->frac_mask;
|
|
post_mask = c->plan->frac_mask | c->plan->dnom_mask;
|
|
}
|
|
else
|
|
{
|
|
pre_mask = c->plan->frac_mask | c->plan->dnom_mask;
|
|
post_mask = c->plan->numr_mask | c->plan->frac_mask;
|
|
}
|
|
|
|
unsigned int count = buffer->len;
|
|
hb_glyph_info_t *info = buffer->info;
|
|
for (unsigned int i = 0; i < count; i++)
|
|
{
|
|
if (info[i].codepoint == 0x2044u) /* FRACTION SLASH */
|
|
{
|
|
unsigned int start = i, end = i + 1;
|
|
while (start &&
|
|
_hb_glyph_info_get_general_category (&info[start - 1]) ==
|
|
HB_UNICODE_GENERAL_CATEGORY_DECIMAL_NUMBER)
|
|
start--;
|
|
while (end < count &&
|
|
_hb_glyph_info_get_general_category (&info[end]) ==
|
|
HB_UNICODE_GENERAL_CATEGORY_DECIMAL_NUMBER)
|
|
end++;
|
|
|
|
buffer->unsafe_to_break (start, end);
|
|
|
|
for (unsigned int j = start; j < i; j++)
|
|
info[j].mask |= pre_mask;
|
|
info[i].mask |= c->plan->frac_mask;
|
|
for (unsigned int j = i + 1; j < end; j++)
|
|
info[j].mask |= post_mask;
|
|
|
|
i = end - 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
static inline void
|
|
hb_ot_shape_initialize_masks (const hb_ot_shape_context_t *c)
|
|
{
|
|
hb_ot_map_t *map = &c->plan->map;
|
|
hb_buffer_t *buffer = c->buffer;
|
|
|
|
hb_mask_t global_mask = map->get_global_mask ();
|
|
buffer->reset_masks (global_mask);
|
|
}
|
|
|
|
static inline void
|
|
hb_ot_shape_setup_masks (const hb_ot_shape_context_t *c)
|
|
{
|
|
hb_ot_map_t *map = &c->plan->map;
|
|
hb_buffer_t *buffer = c->buffer;
|
|
|
|
hb_ot_shape_setup_masks_fraction (c);
|
|
|
|
if (c->plan->shaper->setup_masks)
|
|
c->plan->shaper->setup_masks (c->plan, buffer, c->font);
|
|
|
|
for (unsigned int i = 0; i < c->num_user_features; i++)
|
|
{
|
|
const hb_feature_t *feature = &c->user_features[i];
|
|
if (!(feature->start == HB_FEATURE_GLOBAL_START && feature->end == HB_FEATURE_GLOBAL_END)) {
|
|
unsigned int shift;
|
|
hb_mask_t mask = map->get_mask (feature->tag, &shift);
|
|
buffer->set_masks (feature->value << shift, mask, feature->start, feature->end);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
hb_ot_zero_width_default_ignorables (const hb_buffer_t *buffer)
|
|
{
|
|
if (!(buffer->scratch_flags & HB_BUFFER_SCRATCH_FLAG_HAS_DEFAULT_IGNORABLES) ||
|
|
(buffer->flags & HB_BUFFER_FLAG_PRESERVE_DEFAULT_IGNORABLES) ||
|
|
(buffer->flags & HB_BUFFER_FLAG_REMOVE_DEFAULT_IGNORABLES))
|
|
return;
|
|
|
|
unsigned int count = buffer->len;
|
|
hb_glyph_info_t *info = buffer->info;
|
|
hb_glyph_position_t *pos = buffer->pos;
|
|
unsigned int i = 0;
|
|
for (i = 0; i < count; i++)
|
|
if (unlikely (_hb_glyph_info_is_default_ignorable (&info[i])))
|
|
pos[i].x_advance = pos[i].y_advance = pos[i].x_offset = pos[i].y_offset = 0;
|
|
}
|
|
|
|
static void
|
|
hb_ot_hide_default_ignorables (hb_buffer_t *buffer,
|
|
hb_font_t *font)
|
|
{
|
|
if (!(buffer->scratch_flags & HB_BUFFER_SCRATCH_FLAG_HAS_DEFAULT_IGNORABLES) ||
|
|
(buffer->flags & HB_BUFFER_FLAG_PRESERVE_DEFAULT_IGNORABLES))
|
|
return;
|
|
|
|
unsigned int count = buffer->len;
|
|
hb_glyph_info_t *info = buffer->info;
|
|
|
|
hb_codepoint_t invisible = buffer->invisible;
|
|
if (!(buffer->flags & HB_BUFFER_FLAG_REMOVE_DEFAULT_IGNORABLES) &&
|
|
(invisible || font->get_nominal_glyph (' ', &invisible)))
|
|
{
|
|
/* Replace default-ignorables with a zero-advance invisible glyph. */
|
|
for (unsigned int i = 0; i < count; i++)
|
|
{
|
|
if (_hb_glyph_info_is_default_ignorable (&info[i]))
|
|
info[i].codepoint = invisible;
|
|
}
|
|
}
|
|
else
|
|
hb_ot_layout_delete_glyphs_inplace (buffer, _hb_glyph_info_is_default_ignorable);
|
|
}
|
|
|
|
|
|
static inline void
|
|
hb_ot_map_glyphs_fast (hb_buffer_t *buffer)
|
|
{
|
|
/* Normalization process sets up glyph_index(), we just copy it. */
|
|
unsigned int count = buffer->len;
|
|
hb_glyph_info_t *info = buffer->info;
|
|
for (unsigned int i = 0; i < count; i++)
|
|
info[i].codepoint = info[i].glyph_index();
|
|
|
|
buffer->content_type = HB_BUFFER_CONTENT_TYPE_GLYPHS;
|
|
}
|
|
|
|
static inline void
|
|
hb_synthesize_glyph_classes (hb_buffer_t *buffer)
|
|
{
|
|
unsigned int count = buffer->len;
|
|
hb_glyph_info_t *info = buffer->info;
|
|
for (unsigned int i = 0; i < count; i++)
|
|
{
|
|
hb_ot_layout_glyph_props_flags_t klass;
|
|
|
|
/* Never mark default-ignorables as marks.
|
|
* They won't get in the way of lookups anyway,
|
|
* but having them as mark will cause them to be skipped
|
|
* over if the lookup-flag says so, but at least for the
|
|
* Mongolian variation selectors, looks like Uniscribe
|
|
* marks them as non-mark. Some Mongolian fonts without
|
|
* GDEF rely on this. Another notable character that
|
|
* this applies to is COMBINING GRAPHEME JOINER. */
|
|
klass = (_hb_glyph_info_get_general_category (&info[i]) !=
|
|
HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK ||
|
|
_hb_glyph_info_is_default_ignorable (&info[i])) ?
|
|
HB_OT_LAYOUT_GLYPH_PROPS_BASE_GLYPH :
|
|
HB_OT_LAYOUT_GLYPH_PROPS_MARK;
|
|
_hb_glyph_info_set_glyph_props (&info[i], klass);
|
|
}
|
|
}
|
|
|
|
static inline void
|
|
hb_ot_substitute_default (const hb_ot_shape_context_t *c)
|
|
{
|
|
hb_buffer_t *buffer = c->buffer;
|
|
|
|
hb_ot_rotate_chars (c);
|
|
|
|
HB_BUFFER_ALLOCATE_VAR (buffer, glyph_index);
|
|
|
|
_hb_ot_shape_normalize (c->plan, buffer, c->font);
|
|
|
|
hb_ot_shape_setup_masks (c);
|
|
|
|
/* This is unfortunate to go here, but necessary... */
|
|
if (c->plan->fallback_mark_positioning)
|
|
_hb_ot_shape_fallback_mark_position_recategorize_marks (c->plan, c->font, buffer);
|
|
|
|
hb_ot_map_glyphs_fast (buffer);
|
|
|
|
HB_BUFFER_DEALLOCATE_VAR (buffer, glyph_index);
|
|
}
|
|
|
|
static inline void
|
|
hb_ot_substitute_complex (const hb_ot_shape_context_t *c)
|
|
{
|
|
hb_buffer_t *buffer = c->buffer;
|
|
|
|
hb_ot_layout_substitute_start (c->font, buffer);
|
|
|
|
if (c->plan->fallback_glyph_classes)
|
|
hb_synthesize_glyph_classes (c->buffer);
|
|
|
|
c->plan->substitute (c->font, buffer);
|
|
}
|
|
|
|
static inline void
|
|
hb_ot_substitute_pre (const hb_ot_shape_context_t *c)
|
|
{
|
|
hb_ot_substitute_default (c);
|
|
|
|
_hb_buffer_allocate_gsubgpos_vars (c->buffer);
|
|
|
|
hb_ot_substitute_complex (c);
|
|
|
|
#ifndef HB_NO_AAT_SHAPE
|
|
if (c->plan->apply_morx && c->plan->apply_gpos)
|
|
hb_aat_layout_remove_deleted_glyphs (c->buffer);
|
|
#endif
|
|
}
|
|
|
|
static inline void
|
|
hb_ot_substitute_post (const hb_ot_shape_context_t *c)
|
|
{
|
|
#ifndef HB_NO_AAT_SHAPE
|
|
if (c->plan->apply_morx && !c->plan->apply_gpos)
|
|
hb_aat_layout_remove_deleted_glyphs (c->buffer);
|
|
#endif
|
|
|
|
hb_ot_hide_default_ignorables (c->buffer, c->font);
|
|
|
|
if (c->plan->shaper->postprocess_glyphs &&
|
|
c->buffer->message(c->font, "start postprocess-glyphs")) {
|
|
c->plan->shaper->postprocess_glyphs (c->plan, c->buffer, c->font);
|
|
(void) c->buffer->message(c->font, "end postprocess-glyphs");
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Position
|
|
*/
|
|
|
|
static inline void
|
|
adjust_mark_offsets (hb_glyph_position_t *pos)
|
|
{
|
|
pos->x_offset -= pos->x_advance;
|
|
pos->y_offset -= pos->y_advance;
|
|
}
|
|
|
|
static inline void
|
|
zero_mark_width (hb_glyph_position_t *pos)
|
|
{
|
|
pos->x_advance = 0;
|
|
pos->y_advance = 0;
|
|
}
|
|
|
|
static inline void
|
|
zero_mark_widths_by_gdef (hb_buffer_t *buffer, bool adjust_offsets)
|
|
{
|
|
unsigned int count = buffer->len;
|
|
hb_glyph_info_t *info = buffer->info;
|
|
for (unsigned int i = 0; i < count; i++)
|
|
if (_hb_glyph_info_is_mark (&info[i]))
|
|
{
|
|
if (adjust_offsets)
|
|
adjust_mark_offsets (&buffer->pos[i]);
|
|
zero_mark_width (&buffer->pos[i]);
|
|
}
|
|
}
|
|
|
|
static inline void
|
|
hb_ot_position_default (const hb_ot_shape_context_t *c)
|
|
{
|
|
hb_direction_t direction = c->buffer->props.direction;
|
|
unsigned int count = c->buffer->len;
|
|
hb_glyph_info_t *info = c->buffer->info;
|
|
hb_glyph_position_t *pos = c->buffer->pos;
|
|
|
|
if (HB_DIRECTION_IS_HORIZONTAL (direction))
|
|
{
|
|
c->font->get_glyph_h_advances (count, &info[0].codepoint, sizeof(info[0]),
|
|
&pos[0].x_advance, sizeof(pos[0]));
|
|
/* The nil glyph_h_origin() func returns 0, so no need to apply it. */
|
|
if (c->font->has_glyph_h_origin_func ())
|
|
for (unsigned int i = 0; i < count; i++)
|
|
c->font->subtract_glyph_h_origin (info[i].codepoint,
|
|
&pos[i].x_offset,
|
|
&pos[i].y_offset);
|
|
}
|
|
else
|
|
{
|
|
c->font->get_glyph_v_advances (count, &info[0].codepoint, sizeof(info[0]),
|
|
&pos[0].y_advance, sizeof(pos[0]));
|
|
for (unsigned int i = 0; i < count; i++)
|
|
{
|
|
c->font->subtract_glyph_v_origin (info[i].codepoint,
|
|
&pos[i].x_offset,
|
|
&pos[i].y_offset);
|
|
}
|
|
}
|
|
if (c->buffer->scratch_flags & HB_BUFFER_SCRATCH_FLAG_HAS_SPACE_FALLBACK)
|
|
_hb_ot_shape_fallback_spaces (c->plan, c->font, c->buffer);
|
|
}
|
|
|
|
static inline void
|
|
hb_ot_position_complex (const hb_ot_shape_context_t *c)
|
|
{
|
|
unsigned int count = c->buffer->len;
|
|
hb_glyph_info_t *info = c->buffer->info;
|
|
hb_glyph_position_t *pos = c->buffer->pos;
|
|
|
|
/* If the font has no GPOS and direction is forward, then when
|
|
* zeroing mark widths, we shift the mark with it, such that the
|
|
* mark is positioned hanging over the previous glyph. When
|
|
* direction is backward we don't shift and it will end up
|
|
* hanging over the next glyph after the final reordering.
|
|
*
|
|
* Note: If fallback positinoing happens, we don't care about
|
|
* this as it will be overridden.
|
|
*/
|
|
bool adjust_offsets_when_zeroing = c->plan->adjust_mark_positioning_when_zeroing &&
|
|
HB_DIRECTION_IS_FORWARD (c->buffer->props.direction);
|
|
|
|
/* We change glyph origin to what GPOS expects (horizontal), apply GPOS, change it back. */
|
|
|
|
/* The nil glyph_h_origin() func returns 0, so no need to apply it. */
|
|
if (c->font->has_glyph_h_origin_func ())
|
|
for (unsigned int i = 0; i < count; i++)
|
|
c->font->add_glyph_h_origin (info[i].codepoint,
|
|
&pos[i].x_offset,
|
|
&pos[i].y_offset);
|
|
|
|
hb_ot_layout_position_start (c->font, c->buffer);
|
|
|
|
if (c->plan->zero_marks)
|
|
switch (c->plan->shaper->zero_width_marks)
|
|
{
|
|
case HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_EARLY:
|
|
zero_mark_widths_by_gdef (c->buffer, adjust_offsets_when_zeroing);
|
|
break;
|
|
|
|
default:
|
|
case HB_OT_SHAPE_ZERO_WIDTH_MARKS_NONE:
|
|
case HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_LATE:
|
|
break;
|
|
}
|
|
|
|
c->plan->position (c->font, c->buffer);
|
|
|
|
if (c->plan->zero_marks)
|
|
switch (c->plan->shaper->zero_width_marks)
|
|
{
|
|
case HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_LATE:
|
|
zero_mark_widths_by_gdef (c->buffer, adjust_offsets_when_zeroing);
|
|
break;
|
|
|
|
default:
|
|
case HB_OT_SHAPE_ZERO_WIDTH_MARKS_NONE:
|
|
case HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_EARLY:
|
|
break;
|
|
}
|
|
|
|
/* Finish off. Has to follow a certain order. */
|
|
hb_ot_layout_position_finish_advances (c->font, c->buffer);
|
|
hb_ot_zero_width_default_ignorables (c->buffer);
|
|
#ifndef HB_NO_AAT_SHAPE
|
|
if (c->plan->apply_morx)
|
|
hb_aat_layout_zero_width_deleted_glyphs (c->buffer);
|
|
#endif
|
|
hb_ot_layout_position_finish_offsets (c->font, c->buffer);
|
|
|
|
/* The nil glyph_h_origin() func returns 0, so no need to apply it. */
|
|
if (c->font->has_glyph_h_origin_func ())
|
|
for (unsigned int i = 0; i < count; i++)
|
|
c->font->subtract_glyph_h_origin (info[i].codepoint,
|
|
&pos[i].x_offset,
|
|
&pos[i].y_offset);
|
|
|
|
if (c->plan->fallback_mark_positioning)
|
|
_hb_ot_shape_fallback_mark_position (c->plan, c->font, c->buffer,
|
|
adjust_offsets_when_zeroing);
|
|
}
|
|
|
|
static inline void
|
|
hb_ot_position (const hb_ot_shape_context_t *c)
|
|
{
|
|
c->buffer->clear_positions ();
|
|
|
|
hb_ot_position_default (c);
|
|
|
|
hb_ot_position_complex (c);
|
|
|
|
if (HB_DIRECTION_IS_BACKWARD (c->buffer->props.direction))
|
|
hb_buffer_reverse (c->buffer);
|
|
|
|
_hb_buffer_deallocate_gsubgpos_vars (c->buffer);
|
|
}
|
|
|
|
static inline void
|
|
hb_propagate_flags (hb_buffer_t *buffer)
|
|
{
|
|
/* Propagate cluster-level glyph flags to be the same on all cluster glyphs.
|
|
* Simplifies using them. */
|
|
|
|
if (!(buffer->scratch_flags & HB_BUFFER_SCRATCH_FLAG_HAS_GLYPH_FLAGS))
|
|
return;
|
|
|
|
hb_glyph_info_t *info = buffer->info;
|
|
|
|
foreach_cluster (buffer, start, end)
|
|
{
|
|
unsigned int mask = 0;
|
|
for (unsigned int i = start; i < end; i++)
|
|
mask |= info[i].mask & HB_GLYPH_FLAG_DEFINED;
|
|
if (mask)
|
|
for (unsigned int i = start; i < end; i++)
|
|
info[i].mask |= mask;
|
|
}
|
|
}
|
|
|
|
/* Pull it all together! */
|
|
|
|
static void
|
|
hb_ot_shape_internal (hb_ot_shape_context_t *c)
|
|
{
|
|
c->buffer->enter ();
|
|
|
|
/* Save the original direction, we use it later. */
|
|
c->target_direction = c->buffer->props.direction;
|
|
|
|
_hb_buffer_allocate_unicode_vars (c->buffer);
|
|
|
|
hb_ot_shape_initialize_masks (c);
|
|
hb_set_unicode_props (c->buffer);
|
|
hb_insert_dotted_circle (c->buffer, c->font);
|
|
|
|
hb_form_clusters (c->buffer);
|
|
|
|
hb_ensure_native_direction (c->buffer);
|
|
|
|
if (c->plan->shaper->preprocess_text &&
|
|
c->buffer->message(c->font, "start preprocess-text"))
|
|
{
|
|
c->plan->shaper->preprocess_text (c->plan, c->buffer, c->font);
|
|
(void) c->buffer->message(c->font, "end preprocess-text");
|
|
}
|
|
|
|
hb_ot_substitute_pre (c);
|
|
hb_ot_position (c);
|
|
hb_ot_substitute_post (c);
|
|
|
|
hb_propagate_flags (c->buffer);
|
|
|
|
_hb_buffer_deallocate_unicode_vars (c->buffer);
|
|
|
|
c->buffer->props.direction = c->target_direction;
|
|
|
|
c->buffer->leave ();
|
|
}
|
|
|
|
|
|
hb_bool_t
|
|
_hb_ot_shape (hb_shape_plan_t *shape_plan,
|
|
hb_font_t *font,
|
|
hb_buffer_t *buffer,
|
|
const hb_feature_t *features,
|
|
unsigned int num_features)
|
|
{
|
|
hb_ot_shape_context_t c = {&shape_plan->ot, font, font->face, buffer, features, num_features};
|
|
hb_ot_shape_internal (&c);
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
/**
|
|
* hb_ot_shape_plan_collect_lookups:
|
|
* @shape_plan: #hb_shape_plan_t to query
|
|
* @table_tag: GSUB or GPOS
|
|
* @lookup_indexes: (out): The #hb_set_t set of lookups returned
|
|
*
|
|
* Computes the complete set of GSUB or GPOS lookups that are applicable
|
|
* under a given @shape_plan.
|
|
*
|
|
* Since: 0.9.7
|
|
**/
|
|
void
|
|
hb_ot_shape_plan_collect_lookups (hb_shape_plan_t *shape_plan,
|
|
hb_tag_t table_tag,
|
|
hb_set_t *lookup_indexes /* OUT */)
|
|
{
|
|
shape_plan->ot.collect_lookups (table_tag, lookup_indexes);
|
|
}
|
|
|
|
|
|
/* TODO Move this to hb-ot-shape-normalize, make it do decompose, and make it public. */
|
|
static void
|
|
add_char (hb_font_t *font,
|
|
hb_unicode_funcs_t *unicode,
|
|
hb_bool_t mirror,
|
|
hb_codepoint_t u,
|
|
hb_set_t *glyphs)
|
|
{
|
|
hb_codepoint_t glyph;
|
|
if (font->get_nominal_glyph (u, &glyph))
|
|
glyphs->add (glyph);
|
|
if (mirror)
|
|
{
|
|
hb_codepoint_t m = unicode->mirroring (u);
|
|
if (m != u && font->get_nominal_glyph (m, &glyph))
|
|
glyphs->add (glyph);
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* hb_ot_shape_glyphs_closure:
|
|
* @font: #hb_font_t to work upon
|
|
* @buffer: The input buffer to compute from
|
|
* @features: (array length=num_features): The features enabled on the buffer
|
|
* @num_features: The number of features enabled on the buffer
|
|
* @glyphs: (out): The #hb_set_t set of glyphs comprising the transitive closure of the query
|
|
*
|
|
* Computes the transitive closure of glyphs needed for a specified
|
|
* input buffer under the given font and feature list. The closure is
|
|
* computed as a set, not as a list.
|
|
*
|
|
* Since: 0.9.2
|
|
**/
|
|
void
|
|
hb_ot_shape_glyphs_closure (hb_font_t *font,
|
|
hb_buffer_t *buffer,
|
|
const hb_feature_t *features,
|
|
unsigned int num_features,
|
|
hb_set_t *glyphs)
|
|
{
|
|
const char *shapers[] = {"ot", nullptr};
|
|
hb_shape_plan_t *shape_plan = hb_shape_plan_create_cached (font->face, &buffer->props,
|
|
features, num_features, shapers);
|
|
|
|
bool mirror = hb_script_get_horizontal_direction (buffer->props.script) == HB_DIRECTION_RTL;
|
|
|
|
unsigned int count = buffer->len;
|
|
hb_glyph_info_t *info = buffer->info;
|
|
for (unsigned int i = 0; i < count; i++)
|
|
add_char (font, buffer->unicode, mirror, info[i].codepoint, glyphs);
|
|
|
|
hb_set_t *lookups = hb_set_create ();
|
|
hb_ot_shape_plan_collect_lookups (shape_plan, HB_OT_TAG_GSUB, lookups);
|
|
hb_ot_layout_lookups_substitute_closure (font->face, lookups, glyphs);
|
|
|
|
hb_set_destroy (lookups);
|
|
|
|
hb_shape_plan_destroy (shape_plan);
|
|
}
|
|
|
|
|
|
#endif
|