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 32 namespace 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 42 struct 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 72 struct maxp 73 { 74 enum { 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.len); 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
