125 lines
3.3 KiB
C++
125 lines
3.3 KiB
C++
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/*
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* Copyright © 2018 Google, Inc.
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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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* Google Author(s): Behdad Esfahbod
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*/
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#ifndef HB_OT_SHAPE_COMPLEX_KHMER_PRIVATE_HH
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#define HB_OT_SHAPE_COMPLEX_KHMER_PRIVATE_HH
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#include "hb-private.hh"
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#include "hb-ot-shape-complex-indic-private.hh"
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/* buffer var allocations */
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#define khmer_category() indic_category() /* khmer_category_t */
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#define khmer_position() indic_position() /* khmer_position_t */
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typedef indic_category_t khmer_category_t;
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typedef indic_position_t khmer_position_t;
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static inline khmer_position_t
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matra_position_khmer (khmer_position_t side)
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{
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switch ((int) side)
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{
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case POS_PRE_C:
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return POS_PRE_M;
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case POS_POST_C:
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case POS_ABOVE_C:
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case POS_BELOW_C:
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return POS_AFTER_POST;
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default:
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return side;
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};
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}
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static inline bool
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is_consonant_or_vowel (const hb_glyph_info_t &info)
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{
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return is_one_of (info, CONSONANT_FLAGS | FLAG (OT_V));
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}
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static inline bool
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is_coeng (const hb_glyph_info_t &info)
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{
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return is_one_of (info, FLAG (OT_Coeng));
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}
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static inline void
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set_khmer_properties (hb_glyph_info_t &info)
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{
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hb_codepoint_t u = info.codepoint;
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unsigned int type = hb_indic_get_categories (u);
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khmer_category_t cat = (khmer_category_t) (type & 0x7Fu);
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khmer_position_t pos = (khmer_position_t) (type >> 8);
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/*
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* Re-assign category
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*/
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if (unlikely (u == 0x17C6u)) cat = OT_N; /* Khmer Bindu doesn't like to be repositioned. */
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else if (unlikely (hb_in_range<hb_codepoint_t> (u, 0x17CDu, 0x17D1u) ||
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u == 0x17CBu || u == 0x17D3u || u == 0x17DDu)) /* Khmer Various signs */
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{
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/* These can occur mid-syllable (eg. before matras), even though Unicode marks them as Syllable_Modifier.
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* https://github.com/roozbehp/unicode-data/issues/5 */
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cat = OT_M;
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pos = POS_ABOVE_C;
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}
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else if (unlikely (hb_in_range<hb_codepoint_t> (u, 0x2010u, 0x2011u))) cat = OT_PLACEHOLDER;
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else if (unlikely (u == 0x25CCu)) cat = OT_DOTTEDCIRCLE;
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/*
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* Re-assign position.
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*/
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if ((FLAG_UNSAFE (cat) & CONSONANT_FLAGS))
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{
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pos = POS_BASE_C;
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if (u == 0x179Au)
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cat = OT_Ra;
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}
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else if (cat == OT_M)
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{
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pos = matra_position_khmer (pos);
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}
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else if ((FLAG_UNSAFE (cat) & (FLAG (OT_SM) | FLAG (OT_A) | FLAG (OT_Symbol))))
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{
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pos = POS_SMVD;
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}
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info.khmer_category() = cat;
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info.khmer_position() = pos;
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}
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#endif /* HB_OT_SHAPE_COMPLEX_KHMER_PRIVATE_HH */
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