93 lines
3.0 KiB
C++
93 lines
3.0 KiB
C++
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/*
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* Copyright © 2018 Ebrahim Byagowi
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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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#ifndef HB_AAT_LAYOUT_LCAR_TABLE_HH
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#define HB_AAT_LAYOUT_LCAR_TABLE_HH
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#include "hb-open-type.hh"
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#include "hb-aat-layout-common.hh"
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/*
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* lcar -- Ligature caret
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* https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6lcar.html
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*/
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#define HB_AAT_TAG_lcar HB_TAG('l','c','a','r')
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namespace AAT {
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typedef ArrayOf<HBINT16> LigCaretClassEntry;
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struct lcar
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{
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static const hb_tag_t tableTag = HB_AAT_TAG_lcar;
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inline unsigned int get_lig_carets (hb_font_t *font,
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hb_direction_t direction,
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hb_codepoint_t glyph,
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unsigned int start_offset,
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unsigned int *caret_count /* IN/OUT */,
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hb_position_t *caret_array /* OUT */) const
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{
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const OffsetTo<LigCaretClassEntry>* entry_offset = lookup.get_value (glyph, font->face->num_glyphs);
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const LigCaretClassEntry& array = entry_offset ? this+*entry_offset : Null (LigCaretClassEntry);
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if (caret_count && *caret_count)
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{
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const HBINT16 *arr = array.sub_array (start_offset, caret_count);
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unsigned int count = *caret_count;
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for (unsigned int i = 0; i < count; ++i)
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switch (format)
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{
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case 0: caret_array[i] = font->em_scale_dir (arr[i], direction); break;
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case 1:
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hb_position_t x, y;
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font->get_glyph_contour_point_for_origin (glyph, arr[i], direction, &x, &y);
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caret_array[i] = HB_DIRECTION_IS_HORIZONTAL (direction) ? x : y;
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break;
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}
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}
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return array.len;
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}
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inline bool sanitize (hb_sanitize_context_t *c) const
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{
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TRACE_SANITIZE (this);
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return_trace (likely (c->check_struct (this) &&
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version.major == 1 &&
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lookup.sanitize (c, this)));
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}
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protected:
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FixedVersion<>version; /* Version number of the ligature caret table */
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HBUINT16 format; /* Format of the ligature caret table. */
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Lookup<OffsetTo<LigCaretClassEntry> >
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lookup; /* data Lookup table associating glyphs */
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public:
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DEFINE_SIZE_MIN (8);
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};
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} /* namespace AAT */
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#endif /* HB_AAT_LAYOUT_LCAR_TABLE_HH */
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