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
38
39 /* Note: This enum is duplicated in the -machine.rl source file.
40 * Not sure how to avoid duplication. */
41 enum khmer_category_t
42 {
43 OT_Robatic = 20,
44 OT_Xgroup = 21,
45 OT_Ygroup = 22,
46
47 OT_VAbv = 26,
48 OT_VBlw = 27,
49 OT_VPre = 28,
50 OT_VPst = 29,
51 };
52
53 static inline void
set_khmer_properties(hb_glyph_info_t & info)54 set_khmer_properties (hb_glyph_info_t &info)
55 {
56 hb_codepoint_t u = info.codepoint;
57 unsigned int type = hb_indic_get_categories (u);
58 khmer_category_t cat = (khmer_category_t) (type & 0x7Fu);
59 indic_position_t pos = (indic_position_t) (type >> 8);
60
61
62 /*
63 * Re-assign category
64 *
65 * These categories are experimentally extracted from what Uniscribe allows.
66 */
67 switch (u)
68 {
69 case 0x179Au:
70 cat = (khmer_category_t) OT_Ra;
71 break;
72
73 case 0x17CCu:
74 case 0x17C9u:
75 case 0x17CAu:
76 cat = OT_Robatic;
77 break;
78
79 case 0x17C6u:
80 case 0x17CBu:
81 case 0x17CDu:
82 case 0x17CEu:
83 case 0x17CFu:
84 case 0x17D0u:
85 case 0x17D1u:
86 cat = OT_Xgroup;
87 break;
88
89 case 0x17C7u:
90 case 0x17C8u:
91 case 0x17DDu:
92 case 0x17D3u: /* Just guessing. Uniscribe doesn't categorize it. */
93 cat = OT_Ygroup;
94 break;
95 }
96
97 /*
98 * Re-assign position.
99 */
100 if (cat == (khmer_category_t) OT_M)
101 switch ((int) pos)
102 {
103 case POS_PRE_C: cat = OT_VPre; break;
104 case POS_BELOW_C: cat = OT_VBlw; break;
105 case POS_ABOVE_C: cat = OT_VAbv; break;
106 case POS_POST_C: cat = OT_VPst; break;
107 default: assert (0);
108 };
109
110 info.khmer_category() = cat;
111 }
112
113
114 #endif /* HB_OT_SHAPE_COMPLEX_KHMER_HH */
115