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 #include "hb.hh"
28
29 #include "hb-open-type.hh"
30 #include "hb-face.hh"
31
32 #include "hb-aat-layout-common.hh"
33 #include "hb-aat-layout-feat-table.hh"
34 #include "hb-cff-interp-common.hh"
35 #include "hb-ot-layout-common.hh"
36 #include "hb-ot-cmap-table.hh"
37 #include "OT/Color/COLR/COLR.hh"
38 #include "hb-ot-glyf-table.hh"
39 #include "hb-ot-head-table.hh"
40 #include "hb-ot-hmtx-table.hh"
41 #include "hb-ot-maxp-table.hh"
42
43 #ifndef HB_NO_VISIBILITY
44 #include "hb-ot-name-language-static.hh"
45
46 uint64_t const _hb_NullPool[(HB_NULL_POOL_SIZE + sizeof (uint64_t) - 1) / sizeof (uint64_t)] = {};
47 /*thread_local*/ uint64_t _hb_CrapPool[(HB_NULL_POOL_SIZE + sizeof (uint64_t) - 1) / sizeof (uint64_t)] = {};
48
49 DEFINE_NULL_NAMESPACE_BYTES (OT, Index) = {0xFF,0xFF};
50 DEFINE_NULL_NAMESPACE_BYTES (OT, VarIdx) = {0xFF,0xFF,0xFF,0xFF};
51 DEFINE_NULL_NAMESPACE_BYTES (OT, LangSys) = {0x00,0x00, 0xFF,0xFF, 0x00,0x00};
52 DEFINE_NULL_NAMESPACE_BYTES (OT, RangeRecord) = {0x01};
53 DEFINE_NULL_NAMESPACE_BYTES (OT, ClipRecord) = {0x01};
54 DEFINE_NULL_NAMESPACE_BYTES (OT, CmapSubtableLongGroup) = {0x00,0x00,0x00,0x01, 0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00};
55 DEFINE_NULL_NAMESPACE_BYTES (AAT, SettingName) = {0xFF,0xFF, 0xFF,0xFF};
56 DEFINE_NULL_NAMESPACE_BYTES (AAT, Lookup) = {0xFF,0xFF};
57
58
59 /* hb_map_t */
60
61 const hb_codepoint_t minus_1 = -1;
62 static const unsigned char static_endchar_str[] = {OpCode_endchar};
63 const unsigned char *endchar_str = static_endchar_str;
64
65 /* hb_face_t */
66
67 #ifndef HB_NO_BEYOND_64K
68 static inline unsigned
load_num_glyphs_from_loca(const hb_face_t * face)69 load_num_glyphs_from_loca (const hb_face_t *face)
70 {
71 unsigned ret = 0;
72
73 unsigned indexToLocFormat = face->table.head->indexToLocFormat;
74
75 if (indexToLocFormat <= 1)
76 {
77 bool short_offset = 0 == indexToLocFormat;
78 hb_blob_t *loca_blob = face->table.loca.get_blob ();
79 ret = hb_max (1u, loca_blob->length / (short_offset ? 2 : 4)) - 1;
80 }
81
82 return ret;
83 }
84 #endif
85
86 static inline unsigned
load_num_glyphs_from_maxp(const hb_face_t * face)87 load_num_glyphs_from_maxp (const hb_face_t *face)
88 {
89 return face->table.maxp->get_num_glyphs ();
90 }
91
92 unsigned int
load_num_glyphs() const93 hb_face_t::load_num_glyphs () const
94 {
95 unsigned ret = 0;
96
97 #ifndef HB_NO_BEYOND_64K
98 ret = hb_max (ret, load_num_glyphs_from_loca (this));
99 #endif
100
101 ret = hb_max (ret, load_num_glyphs_from_maxp (this));
102
103 num_glyphs = ret;
104 return ret;
105 }
106
107 unsigned int
load_upem() const108 hb_face_t::load_upem () const
109 {
110 unsigned int ret = table.head->get_upem ();
111 upem = ret;
112 return ret;
113 }
114
115
116 #ifndef HB_NO_VAR
117 bool
_glyf_get_leading_bearing_with_var_unscaled(hb_font_t * font,hb_codepoint_t glyph,bool is_vertical,int * lsb)118 _glyf_get_leading_bearing_with_var_unscaled (hb_font_t *font, hb_codepoint_t glyph, bool is_vertical,
119 int *lsb)
120 {
121 return font->face->table.glyf->get_leading_bearing_with_var_unscaled (font, glyph, is_vertical, lsb);
122 }
123
124 unsigned
_glyf_get_advance_with_var_unscaled(hb_font_t * font,hb_codepoint_t glyph,bool is_vertical)125 _glyf_get_advance_with_var_unscaled (hb_font_t *font, hb_codepoint_t glyph, bool is_vertical)
126 {
127 return font->face->table.glyf->get_advance_with_var_unscaled (font, glyph, is_vertical);
128 }
129 #endif
130
131 bool
_glyf_get_leading_bearing_without_var_unscaled(hb_face_t * face,hb_codepoint_t gid,bool is_vertical,int * lsb)132 _glyf_get_leading_bearing_without_var_unscaled (hb_face_t *face, hb_codepoint_t gid, bool is_vertical, int *lsb)
133 {
134 return face->table.glyf->get_leading_bearing_without_var_unscaled (gid, is_vertical, lsb);
135 }
136
137
138 #endif
139