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 //OT_VAbv = 26,
47 //OT_VBlw = 27,
48 //OT_VPre = 28,
49 //OT_VPst = 29,
50 };
51
52 using khmer_position_t = indic_position_t;
53
54 static inline void
set_khmer_properties(hb_glyph_info_t & info)55 set_khmer_properties (hb_glyph_info_t &info)
56 {
57 hb_codepoint_t u = info.codepoint;
58 unsigned int type = hb_indic_get_categories (u);
59 khmer_category_t cat = (khmer_category_t) (type & 0xFFu);
60 khmer_position_t pos = (khmer_position_t) (type >> 8);
61
62
63 /*
64 * Re-assign category
65 *
66 * These categories are experimentally extracted from what Uniscribe allows.
67 */
68 switch (u)
69 {
70 case 0x179Au:
71 cat = (khmer_category_t) OT_Ra;
72 break;
73
74 case 0x17CCu:
75 case 0x17C9u:
76 case 0x17CAu:
77 cat = OT_Robatic;
78 break;
79
80 case 0x17C6u:
81 case 0x17CBu:
82 case 0x17CDu:
83 case 0x17CEu:
84 case 0x17CFu:
85 case 0x17D0u:
86 case 0x17D1u:
87 cat = OT_Xgroup;
88 break;
89
90 case 0x17C7u:
91 case 0x17C8u:
92 case 0x17DDu:
93 case 0x17D3u: /* Just guessing. Uniscribe doesn't categorize it. */
94 cat = OT_Ygroup;
95 break;
96 }
97
98 /*
99 * Re-assign position.
100 */
101 if (cat == (khmer_category_t) OT_M)
102 switch ((int) pos)
103 {
104 case POS_PRE_C: cat = (khmer_category_t) OT_VPre; break;
105 case POS_BELOW_C: cat = (khmer_category_t) OT_VBlw; break;
106 case POS_ABOVE_C: cat = (khmer_category_t) OT_VAbv; break;
107 case POS_POST_C: cat = (khmer_category_t) OT_VPst; break;
108 default: assert (0);
109 }
110
111 info.khmer_category() = cat;
112 }
113
114
115 #endif /* HB_OT_SHAPE_COMPLEX_KHMER_HH */
116