1/*
2 * Copyright © 2018 Google, Inc.
3 *
4 * This is part of HarfBuzz, a text shaping library.
5 *
6 * Permission is hereby granted, without written agreement and without
7 * license or royalty fees, to use, copy, modify, and distribute this
8 * software and its documentation for any purpose, provided that the
9 * above copyright notice and the following two paragraphs appear in
10 * all copies of this software.
11 *
12 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
13 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
14 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
15 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
16 * DAMAGE.
17 *
18 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
19 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
20 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
21 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
22 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
23 *
24 * Google Author(s): Behdad Esfahbod
25 */
26
27#ifndef HB_OT_SHAPE_COMPLEX_KHMER_HH
28#define HB_OT_SHAPE_COMPLEX_KHMER_HH
29
30#include "hb.hh"
31
32#include "hb-ot-shape-complex-indic.hh"
33
34
35/* buffer var allocations */
36#define khmer_category() indic_category() /* khmer_category_t */
37#define khmer_position() indic_position() /* khmer_position_t */
38
39
40typedef indic_category_t khmer_category_t;
41typedef indic_position_t khmer_position_t;
42
43
44static inline khmer_position_t
45matra_position_khmer (khmer_position_t side)
46{
47 switch ((int) side)
48 {
49 case POS_PRE_C:
50 return POS_PRE_M;
51
52 case POS_POST_C:
53 case POS_ABOVE_C:
54 case POS_BELOW_C:
55 return POS_AFTER_POST;
56
57 default:
58 return side;
59 };
60}
61
62static inline bool
63is_consonant_or_vowel (const hb_glyph_info_t &info)
64{
65 return is_one_of (info, CONSONANT_FLAGS | FLAG (OT_V));
66}
67
68static inline bool
69is_coeng (const hb_glyph_info_t &info)
70{
71 return is_one_of (info, FLAG (OT_Coeng));
72}
73
74static inline void
75set_khmer_properties (hb_glyph_info_t &info)
76{
77 hb_codepoint_t u = info.codepoint;
78 unsigned int type = hb_indic_get_categories (u);
79 khmer_category_t cat = (khmer_category_t) (type & 0x7Fu);
80 khmer_position_t pos = (khmer_position_t) (type >> 8);
81
82
83 /*
84 * Re-assign category
85 */
86
87 if (unlikely (u == 0x17C6u)) cat = OT_N; /* Khmer Bindu doesn't like to be repositioned. */
88 else if (unlikely (hb_in_range<hb_codepoint_t> (u, 0x17CDu, 0x17D1u) ||
89 u == 0x17CBu || u == 0x17D3u || u == 0x17DDu)) /* Khmer Various signs */
90 {
91 /* These can occur mid-syllable (eg. before matras), even though Unicode marks them as Syllable_Modifier.
92 * https://github.com/roozbehp/unicode-data/issues/5 */
93 cat = OT_M;
94 pos = POS_ABOVE_C;
95 }
96 else if (unlikely (hb_in_range<hb_codepoint_t> (u, 0x2010u, 0x2011u))) cat = OT_PLACEHOLDER;
97 else if (unlikely (u == 0x25CCu)) cat = OT_DOTTEDCIRCLE;
98
99
100 /*
101 * Re-assign position.
102 */
103
104 if ((FLAG_UNSAFE (cat) & CONSONANT_FLAGS))
105 {
106 pos = POS_BASE_C;
107 if (u == 0x179Au)
108 cat = OT_Ra;
109 }
110 else if (cat == OT_M)
111 {
112 pos = matra_position_khmer (pos);
113 }
114 else if ((FLAG_UNSAFE (cat) & (FLAG (OT_SM) | FLAG (OT_A) | FLAG (OT_Symbol))))
115 {
116 pos = POS_SMVD;
117 }
118
119 info.khmer_category() = cat;
120 info.khmer_position() = pos;
121}
122
123
124#endif /* HB_OT_SHAPE_COMPLEX_KHMER_HH */
125