163 lines
5.1 KiB
C++
163 lines
5.1 KiB
C++
/*
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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 lcarFormat0
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{
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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 */,
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const void *base) const
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{
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const OffsetTo<LigCaretClassEntry>* entry_offset = lookupTable.get_value (glyph,
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font->face->get_num_glyphs ());
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const LigCaretClassEntry& array = entry_offset ? base+*entry_offset : Null (LigCaretClassEntry);
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if (caret_count)
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{
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hb_array_t<const HBINT16> arr = array.sub_array (start_offset, caret_count);
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for (unsigned int i = 0; i < arr.length; ++i)
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caret_array[i] = font->em_scale_dir (arr[i], direction);
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}
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return array.len;
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}
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bool sanitize (hb_sanitize_context_t *c, const void *base) const
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{
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TRACE_SANITIZE (this);
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return_trace (likely (c->check_struct (this) && lookupTable.sanitize (c, base)));
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}
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protected:
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Lookup<OffsetTo<LigCaretClassEntry>>
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lookupTable; /* data Lookup table associating glyphs */
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public:
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DEFINE_SIZE_MIN (2);
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};
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struct lcarFormat1
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{
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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 */,
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const void *base) const
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{
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const OffsetTo<LigCaretClassEntry>* entry_offset = lookupTable.get_value (glyph,
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font->face->get_num_glyphs ());
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const LigCaretClassEntry& array = entry_offset ? base+*entry_offset : Null (LigCaretClassEntry);
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if (caret_count)
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{
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hb_array_t<const HBINT16> arr = array.sub_array (start_offset, caret_count);
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for (unsigned int i = 0; i < arr.length; ++i)
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{
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hb_position_t x = 0, y = 0;
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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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}
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}
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return array.len;
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}
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bool sanitize (hb_sanitize_context_t *c, const void *base) const
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{
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TRACE_SANITIZE (this);
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return_trace (likely (c->check_struct (this) && lookupTable.sanitize (c, base)));
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}
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protected:
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Lookup<OffsetTo<LigCaretClassEntry>>
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lookupTable; /* data Lookup table associating glyphs */
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public:
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DEFINE_SIZE_MIN (2);
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};
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struct lcar
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{
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static constexpr hb_tag_t tableTag = HB_AAT_TAG_lcar;
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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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switch (format)
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{
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case 0: return u.format0.get_lig_carets (font, direction, glyph, start_offset,
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caret_count, caret_array, this);
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case 1: return u.format1.get_lig_carets (font, direction, glyph, start_offset,
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caret_count, caret_array, this);
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default:if (caret_count) *caret_count = 0; return 0;
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}
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}
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bool sanitize (hb_sanitize_context_t *c) const
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{
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TRACE_SANITIZE (this);
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if (unlikely (!c->check_struct (this) || version.major != 1))
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return_trace (false);
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switch (format) {
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case 0: return_trace (u.format0.sanitize (c, this));
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case 1: return_trace (u.format1.sanitize (c, this));
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default:return_trace (true);
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}
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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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union {
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lcarFormat0 format0;
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lcarFormat0 format1;
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} u;
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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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