102 lines
3.5 KiB
C++
102 lines
3.5 KiB
C++
/*
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* Copyright © 2009,2010 Red Hat, Inc.
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* Copyright © 2010,2011,2013 Google, Inc.
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* 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_AAT_SHAPE
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#include "hb-aat-map.hh"
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#include "hb-aat-layout.hh"
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#include "hb-aat-layout-feat-table.hh"
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void hb_aat_map_builder_t::add_feature (hb_tag_t tag, unsigned value)
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{
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if (!face->table.feat->has_data ()) return;
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if (tag == HB_TAG ('a','a','l','t'))
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{
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if (!face->table.feat->exposes_feature (HB_AAT_LAYOUT_FEATURE_TYPE_CHARACTER_ALTERNATIVES))
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return;
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feature_info_t *info = features.push();
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info->type = HB_AAT_LAYOUT_FEATURE_TYPE_CHARACTER_ALTERNATIVES;
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info->setting = (hb_aat_layout_feature_selector_t) value;
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info->seq = features.length;
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info->is_exclusive = true;
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return;
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}
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const hb_aat_feature_mapping_t *mapping = hb_aat_layout_find_feature_mapping (tag);
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if (!mapping) return;
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const AAT::FeatureName* feature = &face->table.feat->get_feature (mapping->aatFeatureType);
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if (!feature->has_data ())
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{
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/* Special case: Chain::compile_flags will fall back to the deprecated version of
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* small-caps if necessary, so we need to check for that possibility.
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* https://github.com/harfbuzz/harfbuzz/issues/2307 */
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if (mapping->aatFeatureType == HB_AAT_LAYOUT_FEATURE_TYPE_LOWER_CASE &&
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mapping->selectorToEnable == HB_AAT_LAYOUT_FEATURE_SELECTOR_LOWER_CASE_SMALL_CAPS)
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{
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feature = &face->table.feat->get_feature (HB_AAT_LAYOUT_FEATURE_TYPE_LETTER_CASE);
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if (!feature->has_data ()) return;
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}
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else return;
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}
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feature_info_t *info = features.push();
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info->type = mapping->aatFeatureType;
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info->setting = value ? mapping->selectorToEnable : mapping->selectorToDisable;
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info->seq = features.length;
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info->is_exclusive = feature->is_exclusive ();
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}
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void
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hb_aat_map_builder_t::compile (hb_aat_map_t &m)
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{
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/* Sort features and merge duplicates */
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if (features.length)
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{
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features.qsort ();
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unsigned int j = 0;
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for (unsigned int i = 1; i < features.length; i++)
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if (features[i].type != features[j].type ||
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/* Nonexclusive feature selectors come in even/odd pairs to turn a setting on/off
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* respectively, so we mask out the low-order bit when checking for "duplicates"
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* (selectors referring to the same feature setting) here. */
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(!features[i].is_exclusive && ((features[i].setting & ~1) != (features[j].setting & ~1))))
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features[++j] = features[i];
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features.shrink (j + 1);
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}
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hb_aat_layout_compile_map (this, &m);
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}
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#endif
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