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-private.hh"
31 #include "hb-subset-plan.hh"
37 * maxp -- The Maximum Profile Table
40 #define HB_OT_TAG_maxp HB_TAG('m','a','x','p')
44 inline 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 const hb_tag_t tableTag = HB_OT_TAG_maxp;
76 inline unsigned int get_num_glyphs (void) const
81 inline void set_num_glyphs (unsigned int count)
83 numGlyphs.set (count);
86 inline bool sanitize (hb_sanitize_context_t *c) const
88 TRACE_SANITIZE (this);
89 if (unlikely (!c->check_struct (this)))
92 if (version.major == 1)
94 const maxpV1Tail &v1 = StructAfter<maxpV1Tail> (*this);
95 return v1.sanitize (c);
97 return_trace (likely (version.major == 0 && version.minor == 0x5000u));
100 inline bool subset (hb_subset_plan_t *plan) const
102 hb_blob_t *maxp_blob = OT::Sanitizer<OT::maxp>().sanitize (hb_face_reference_table (plan->source, HB_OT_TAG_maxp));
103 hb_blob_t *maxp_prime_blob = hb_blob_copy_writable_or_fail (maxp_blob);
104 hb_blob_destroy (maxp_blob);
106 if (unlikely (!maxp_prime_blob)) {
109 OT::maxp *maxp_prime = (OT::maxp *) hb_blob_get_data (maxp_prime_blob, nullptr);
111 maxp_prime->set_num_glyphs (plan->gids_to_retain_sorted.len);
112 if (plan->drop_hints)
113 drop_hint_fields (plan, maxp_prime);
115 bool result = hb_subset_plan_add_table(plan, HB_OT_TAG_maxp, maxp_prime_blob);
116 hb_blob_destroy (maxp_prime_blob);
120 static inline void drop_hint_fields (hb_subset_plan_t *plan, OT::maxp *maxp_prime)
122 if (maxp_prime->version.major == 1)
124 maxpV1Tail &v1 = StructAfter<maxpV1Tail> (*maxp_prime);
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);
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]; */
141 DEFINE_SIZE_STATIC (6);
148 #endif /* HB_OT_MAXP_TABLE_HH */