1/*
2 * Copyright © 2011,2012 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_MAXP_TABLE_HH
28#define HB_OT_MAXP_TABLE_HH
29
30#include "hb-open-type.hh"
31
32namespace OT {
33
34
35/*
36 * maxp -- Maximum Profile
37 * https://docs.microsoft.com/en-us/typography/opentype/spec/maxp
38 */
39
40#define HB_OT_TAG_maxp HB_TAG('m','a','x','p')
41
42struct maxpV1Tail
43{
44 inline bool sanitize (hb_sanitize_context_t *c) const
45 {
46 TRACE_SANITIZE (this);
47 return_trace (c->check_struct (this));
48 }
49
50 HBUINT16 maxPoints; /* Maximum points in a non-composite glyph. */
51 HBUINT16 maxContours; /* Maximum contours in a non-composite glyph. */
52 HBUINT16 maxCompositePoints; /* Maximum points in a composite glyph. */
53 HBUINT16 maxCompositeContours; /* Maximum contours in a composite glyph. */
54 HBUINT16 maxZones; /* 1 if instructions do not use the twilight zone (Z0),
55 * or 2 if instructions do use Z0; should be set to 2 in
56 * most cases. */
57 HBUINT16 maxTwilightPoints; /* Maximum points used in Z0. */
58 HBUINT16 maxStorage; /* Number of Storage Area locations. */
59 HBUINT16 maxFunctionDefs; /* Number of FDEFs, equal to the highest function number + 1. */
60 HBUINT16 maxInstructionDefs; /* Number of IDEFs. */
61 HBUINT16 maxStackElements; /* Maximum stack depth. (This includes Font and CVT
62 * Programs, as well as the instructions for each glyph.) */
63 HBUINT16 maxSizeOfInstructions; /* Maximum byte count for glyph instructions. */
64 HBUINT16 maxComponentElements; /* Maximum number of components referenced at
65 * "top level" for any composite glyph. */
66 HBUINT16 maxComponentDepth; /* Maximum levels of recursion; 1 for simple components. */
67 public:
68 DEFINE_SIZE_STATIC (26);
69};
70
71
72struct maxp
73{
74 static const hb_tag_t tableTag = HB_OT_TAG_maxp;
75
76 inline unsigned int get_num_glyphs (void) const
77 {
78 return numGlyphs;
79 }
80
81 inline void set_num_glyphs (unsigned int count)
82 {
83 numGlyphs.set (count);
84 }
85
86 inline bool sanitize (hb_sanitize_context_t *c) const
87 {
88 TRACE_SANITIZE (this);
89 if (unlikely (!c->check_struct (this)))
90 return_trace (false);
91
92 if (version.major == 1)
93 {
94 const maxpV1Tail &v1 = StructAfter<maxpV1Tail> (*this);
95 return v1.sanitize (c);
96 }
97 return_trace (likely (version.major == 0 && version.minor == 0x5000u));
98 }
99
100 inline bool subset (hb_subset_plan_t *plan) const
101 {
102 hb_blob_t *maxp_blob = hb_sanitize_context_t().reference_table<maxp> (plan->source);
103 hb_blob_t *maxp_prime_blob = hb_blob_copy_writable_or_fail (maxp_blob);
104 hb_blob_destroy (maxp_blob);
105
106 if (unlikely (!maxp_prime_blob)) {
107 return false;
108 }
109 maxp *maxp_prime = (maxp *) hb_blob_get_data (maxp_prime_blob, nullptr);
110
111 maxp_prime->set_num_glyphs (plan->glyphs.len);
112 if (plan->drop_hints)
113 drop_hint_fields (plan, maxp_prime);
114
115 bool result = plan->add_table (HB_OT_TAG_maxp, maxp_prime_blob);
116 hb_blob_destroy (maxp_prime_blob);
117 return result;
118 }
119
120 static inline void drop_hint_fields (hb_subset_plan_t *plan, maxp *maxp_prime)
121 {
122 if (maxp_prime->version.major == 1)
123 {
124 maxpV1Tail &v1 = StructAfter<maxpV1Tail> (*maxp_prime);
125 v1.maxZones.set (1);
126 v1.maxTwilightPoints.set (0);
127 v1.maxStorage.set (0);
128 v1.maxFunctionDefs.set (0);
129 v1.maxInstructionDefs.set (0);
130 v1.maxStackElements.set (0);
131 v1.maxSizeOfInstructions.set (0);
132 }
133 }
134
135 protected:
136 FixedVersion<>version; /* Version of the maxp table (0.5 or 1.0),
137 * 0x00005000u or 0x00010000u. */
138 HBUINT16 numGlyphs; /* The number of glyphs in the font. */
139/*maxpV1Tail v1Tail[VAR]; */
140 public:
141 DEFINE_SIZE_STATIC (6);
142};
143
144
145} /* namespace OT */
146
147
148#endif /* HB_OT_MAXP_TABLE_HH */
149