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/* ***** BEGIN LICENSE BLOCK *****
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* ***** END LICENSE BLOCK ***** */
#include "third_party/blink/renderer/platform/fonts/opentype/open_type_caps_support.h"
#include <hb-ot.h>
namespace blink {
bool OpenTypeCapsSupport::SupportsOpenTypeFeature(hb_script_t script,
uint32_t tag) const {
hb_face_t* face = hb_font_get_face(
harfbuzz_face_->GetScaledFont(nullptr, HarfBuzzFace::NoVerticalLayout));
DCHECK(face);
DCHECK(
(tag == HB_TAG('s', 'm', 'c', 'p') || tag == HB_TAG('c', '2', 's', 'c') ||
tag == HB_TAG('p', 'c', 'a', 'p') || tag == HB_TAG('c', '2', 'p', 'c') ||
tag == HB_TAG('s', 'u', 'p', 's') || tag == HB_TAG('s', 'u', 'b', 's') ||
tag == HB_TAG('t', 'i', 't', 'l') || tag == HB_TAG('u', 'n', 'i', 'c') ||
tag == HB_TAG('v', 'e', 'r', 't')));
if (!hb_ot_layout_has_substitution(face))
return false;
// Get the OpenType tag(s) that match this script code
hb_tag_t script_tags[] = {
HB_TAG_NONE, HB_TAG_NONE, HB_TAG_NONE,
};
hb_ot_tags_from_script(static_cast<hb_script_t>(script), &script_tags[0],
&script_tags[1]);
const hb_tag_t kGSUB = HB_TAG('G', 'S', 'U', 'B');
unsigned script_index = 0;
// Identify for which script a GSUB table is available.
hb_ot_layout_table_choose_script(face, kGSUB, script_tags, &script_index,
nullptr);
if (hb_ot_layout_language_find_feature(face, kGSUB, script_index,
HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX,
tag, nullptr)) {
return true;
}
return false;
}
} // namespace blink
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