2 * Copyright © 2011,2012 Google, Inc.
4 * This is part of HarfBuzz, a text shaping library.
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.
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
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.
24 * Google Author(s): Behdad Esfahbod
27 #ifndef HB_OT_MAXP_TABLE_HH
28 #define HB_OT_MAXP_TABLE_HH
30 #include "hb-open-type.hh"
36 * maxp -- Maximum Profile
37 * https://docs.microsoft.com/en-us/typography/opentype/spec/maxp
40 #define HB_OT_TAG_maxp HB_TAG('m','a','x','p')
44 bool sanitize (hb_sanitize_context_t *c) const
46 TRACE_SANITIZE (this);
47 return_trace (c->check_struct (this));
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
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. */
68 DEFINE_SIZE_STATIC (26);
74 static constexpr hb_tag_t tableTag = HB_OT_TAG_maxp;
76 unsigned int get_num_glyphs () const { return numGlyphs; }
78 void set_num_glyphs (unsigned int count)
83 bool sanitize (hb_sanitize_context_t *c) const
85 TRACE_SANITIZE (this);
86 if (unlikely (!c->check_struct (this)))
89 if (version.major == 1)
91 const maxpV1Tail &v1 = StructAfter<maxpV1Tail> (*this);
92 return_trace (v1.sanitize (c));
94 return_trace (likely (version.major == 0 && version.minor == 0x5000u));
97 bool subset (hb_subset_context_t *c) const
100 maxp *maxp_prime = c->serializer->embed (this);
101 if (unlikely (!maxp_prime)) return_trace (false);
103 maxp_prime->numGlyphs = c->plan->num_output_glyphs ();
104 if (maxp_prime->version.major == 1)
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);
110 if (c->plan->drop_hints)
111 drop_hint_fields (dest_v1);
117 static void drop_hint_fields (maxpV1Tail* dest_v1)
119 dest_v1->maxZones = 1;
120 dest_v1->maxTwilightPoints = 0;
121 dest_v1->maxStorage = 0;
122 dest_v1->maxFunctionDefs = 0;
123 dest_v1->maxInstructionDefs = 0;
124 dest_v1->maxStackElements = 0;
125 dest_v1->maxSizeOfInstructions = 0;
129 FixedVersion<>version;/* Version of the maxp table (0.5 or 1.0),
130 * 0x00005000u or 0x00010000u. */
132 /* The number of glyphs in the font. */
133 /*maxpV1Tail v1Tail[HB_VAR_ARRAY]; */
135 DEFINE_SIZE_STATIC (6);
142 #endif /* HB_OT_MAXP_TABLE_HH */