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Diffstat (limited to 'src/3rdparty/harfbuzz-ng/src/hb-aat-layout-lcar-table.hh')
| -rw-r--r-- | src/3rdparty/harfbuzz-ng/src/hb-aat-layout-lcar-table.hh | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/src/3rdparty/harfbuzz-ng/src/hb-aat-layout-lcar-table.hh b/src/3rdparty/harfbuzz-ng/src/hb-aat-layout-lcar-table.hh new file mode 100644 index 0000000000..7063b386c2 --- /dev/null +++ b/src/3rdparty/harfbuzz-ng/src/hb-aat-layout-lcar-table.hh @@ -0,0 +1,162 @@ +/* + * Copyright © 2018 Ebrahim Byagowi + * + * 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. + */ +#ifndef HB_AAT_LAYOUT_LCAR_TABLE_HH +#define HB_AAT_LAYOUT_LCAR_TABLE_HH + +#include "hb-open-type.hh" +#include "hb-aat-layout-common.hh" + +/* + * lcar -- Ligature caret + * https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6lcar.html + */ +#define HB_AAT_TAG_lcar HB_TAG('l','c','a','r') + + +namespace AAT { + +typedef ArrayOf<HBINT16> LigCaretClassEntry; + +struct lcarFormat0 +{ + unsigned int get_lig_carets (hb_font_t *font, + hb_direction_t direction, + hb_codepoint_t glyph, + unsigned int start_offset, + unsigned int *caret_count /* IN/OUT */, + hb_position_t *caret_array /* OUT */, + const void *base) const + { + const OffsetTo<LigCaretClassEntry>* entry_offset = lookupTable.get_value (glyph, + font->face->get_num_glyphs ()); + const LigCaretClassEntry& array = entry_offset ? base+*entry_offset : Null (LigCaretClassEntry); + if (caret_count) + { + hb_array_t<const HBINT16> arr = array.sub_array (start_offset, caret_count); + for (unsigned int i = 0; i < arr.length; ++i) + caret_array[i] = font->em_scale_dir (arr[i], direction); + } + return array.len; + } + + bool sanitize (hb_sanitize_context_t *c, const void *base) const + { + TRACE_SANITIZE (this); + return_trace (likely (c->check_struct (this) && lookupTable.sanitize (c, base))); + } + + protected: + Lookup<OffsetTo<LigCaretClassEntry>> + lookupTable; /* data Lookup table associating glyphs */ + public: + DEFINE_SIZE_MIN (2); +}; + +struct lcarFormat1 +{ + unsigned int get_lig_carets (hb_font_t *font, + hb_direction_t direction, + hb_codepoint_t glyph, + unsigned int start_offset, + unsigned int *caret_count /* IN/OUT */, + hb_position_t *caret_array /* OUT */, + const void *base) const + { + const OffsetTo<LigCaretClassEntry>* entry_offset = lookupTable.get_value (glyph, + font->face->get_num_glyphs ()); + const LigCaretClassEntry& array = entry_offset ? base+*entry_offset : Null (LigCaretClassEntry); + if (caret_count) + { + hb_array_t<const HBINT16> arr = array.sub_array (start_offset, caret_count); + for (unsigned int i = 0; i < arr.length; ++i) + { + hb_position_t x = 0, y = 0; + font->get_glyph_contour_point_for_origin (glyph, arr[i], direction, &x, &y); + caret_array[i] = HB_DIRECTION_IS_HORIZONTAL (direction) ? x : y; + } + } + return array.len; + } + + bool sanitize (hb_sanitize_context_t *c, const void *base) const + { + TRACE_SANITIZE (this); + return_trace (likely (c->check_struct (this) && lookupTable.sanitize (c, base))); + } + + protected: + Lookup<OffsetTo<LigCaretClassEntry>> + lookupTable; /* data Lookup table associating glyphs */ + public: + DEFINE_SIZE_MIN (2); +}; + +struct lcar +{ + static constexpr hb_tag_t tableTag = HB_AAT_TAG_lcar; + + unsigned int get_lig_carets (hb_font_t *font, + hb_direction_t direction, + hb_codepoint_t glyph, + unsigned int start_offset, + unsigned int *caret_count /* IN/OUT */, + hb_position_t *caret_array /* OUT */) const + { + switch (format) + { + case 0: return u.format0.get_lig_carets (font, direction, glyph, start_offset, + caret_count, caret_array, this); + case 1: return u.format1.get_lig_carets (font, direction, glyph, start_offset, + caret_count, caret_array, this); + default:if (caret_count) *caret_count = 0; return 0; + } + } + + bool sanitize (hb_sanitize_context_t *c) const + { + TRACE_SANITIZE (this); + if (unlikely (!c->check_struct (this) || version.major != 1)) + return_trace (false); + + switch (format) { + case 0: return_trace (u.format0.sanitize (c, this)); + case 1: return_trace (u.format1.sanitize (c, this)); + default:return_trace (true); + } + } + + protected: + FixedVersion<>version; /* Version number of the ligature caret table */ + HBUINT16 format; /* Format of the ligature caret table. */ + union { + lcarFormat0 format0; + lcarFormat0 format1; + } u; + public: + DEFINE_SIZE_MIN (8); +}; + +} /* namespace AAT */ + +#endif /* HB_AAT_LAYOUT_LCAR_TABLE_HH */ |