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 = 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_context_t *c) const
98 {
99 TRACE_SUBSET (this);
100 maxp *maxp_prime = c->serializer->embed (this);
101 if (unlikely (!maxp_prime)) return_trace (false);
102
103 maxp_prime->numGlyphs = hb_min (c->plan->num_output_glyphs (), 0xFFFFu);
104 if (maxp_prime->version.major == 1)
105 {
106 const maxpV1Tail *src_v1 = &StructAfter<maxpV1Tail> (*this);
107 maxpV1Tail *dest_v1 = c->serializer->embed<maxpV1Tail> (src_v1);
108 if (unlikely (!dest_v1)) return_trace (false);
109
110 if (c->plan->flags & HB_SUBSET_FLAGS_NO_HINTING)
111 drop_hint_fields (dest_v1);
112
113 if (c->plan->normalized_coords)
114 instancing_update_fields (c->plan->head_maxp_info, dest_v1);
115 }
116
117 return_trace (true);
118 }
119
120 void instancing_update_fields (head_maxp_info_t& maxp_info, maxpV1Tail* dest_v1) const
121 {
122 dest_v1->maxPoints = maxp_info.maxPoints;
123 dest_v1->maxContours = maxp_info.maxContours;
124 dest_v1->maxCompositePoints = maxp_info.maxCompositePoints;
125 dest_v1->maxCompositeContours = maxp_info.maxCompositeContours;
126 dest_v1->maxComponentElements = maxp_info.maxComponentElements;
127 dest_v1->maxComponentDepth = maxp_info.maxComponentDepth;
128 }
129
130 static void drop_hint_fields (maxpV1Tail* dest_v1)
131 {
132 dest_v1->maxZones = 1;
133 dest_v1->maxTwilightPoints = 0;
134 dest_v1->maxStorage = 0;
135 dest_v1->maxFunctionDefs = 0;
136 dest_v1->maxInstructionDefs = 0;
137 dest_v1->maxStackElements = 0;
138 dest_v1->maxSizeOfInstructions = 0;
139 }
140
141 protected:
142 FixedVersion<>version;/* Version of the maxp table (0.5 or 1.0),
143 * 0x00005000u or 0x00010000u. */
144 HBUINT16 numGlyphs;
145 /* The number of glyphs in the font. */
146/*maxpV1Tail v1Tail[HB_VAR_ARRAY]; */
147 public:
148 DEFINE_SIZE_STATIC (6);
149};
150
151
152} /* namespace OT */
153
154
155#endif /* HB_OT_MAXP_TABLE_HH */
156