| /* ***** 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 "base/stl_util.h" |
| #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 |
| DCHECK_EQ(HB_TAG_NONE, 0u); |
| hb_tag_t script_tags[2] = {}; |
| unsigned num_returned_script_tags = base::size(script_tags); |
| hb_ot_tags_from_script_and_language( |
| static_cast<hb_script_t>(script), HB_LANGUAGE_INVALID, |
| &num_returned_script_tags, script_tags, nullptr, nullptr); |
| |
| 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_select_script(face, kGSUB, num_returned_script_tags, |
| 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 |
