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