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 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 constexpr hb_tag_t tableTag = HB_OT_TAG_maxp;
75
76 unsigned int get_num_glyphs () const { return numGlyphs; }
77
78 void set_num_glyphs (unsigned int count)
79 {
80 numGlyphs.set (count);
81 }
82
83 bool sanitize (hb_sanitize_context_t *c) const
84 {
85 TRACE_SANITIZE (this);
86 if (unlikely (!c->check_struct (this)))
87 return_trace (false);
88
89 if (version.major == 1)
90 {
91 const maxpV1Tail &v1 = StructAfter<maxpV1Tail> (*this);
92 return_trace (v1.sanitize (c));
93 }
94 return_trace (likely (version.major == 0 && version.minor == 0x5000u));
95 }
96
97 bool subset (hb_subset_plan_t *plan) const
98 {
99 hb_blob_t *maxp_blob = hb_sanitize_context_t().reference_table<maxp> (plan->source);
100 hb_blob_t *maxp_prime_blob = hb_blob_copy_writable_or_fail (maxp_blob);
101 hb_blob_destroy (maxp_blob);
102
103 if (unlikely (!maxp_prime_blob)) {
104 return false;
105 }
106 maxp *maxp_prime = (maxp *) hb_blob_get_data (maxp_prime_blob, nullptr);
107
108 maxp_prime->set_num_glyphs (plan->glyphs.length);
109 if (plan->drop_hints)
110 drop_hint_fields (plan, maxp_prime);
111
112 bool result = plan->add_table (HB_OT_TAG_maxp, maxp_prime_blob);
113 hb_blob_destroy (maxp_prime_blob);
114 return result;
115 }
116
117 static void drop_hint_fields (hb_subset_plan_t *plan HB_UNUSED, maxp *maxp_prime)
118 {
119 if (maxp_prime->version.major == 1)
120 {
121 maxpV1Tail &v1 = StructAfter<maxpV1Tail> (*maxp_prime);
122 v1.maxZones.set (1);
123 v1.maxTwilightPoints.set (0);
124 v1.maxStorage.set (0);
125 v1.maxFunctionDefs.set (0);
126 v1.maxInstructionDefs.set (0);
127 v1.maxStackElements.set (0);
128 v1.maxSizeOfInstructions.set (0);
129 }
130 }
131
132 protected:
133 FixedVersion<>version; /* Version of the maxp table (0.5 or 1.0),
134 * 0x00005000u or 0x00010000u. */
135 HBUINT16 numGlyphs; /* The number of glyphs in the font. */
136/*maxpV1Tail v1Tail[VAR]; */
137 public:
138 DEFINE_SIZE_STATIC (6);
139};
140
141
142} /* namespace OT */
143
144
145#endif /* HB_OT_MAXP_TABLE_HH */
146