hb-ot-maxp-table.hh (5178B)
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 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 hb_barrier (); 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 hb_barrier (); 107 const maxpV1Tail *src_v1 = &StructAfter<maxpV1Tail> (*this); 108 maxpV1Tail *dest_v1 = c->serializer->embed<maxpV1Tail> (src_v1); 109 if (unlikely (!dest_v1)) return_trace (false); 110 111 if (c->plan->flags & HB_SUBSET_FLAGS_NO_HINTING) 112 drop_hint_fields (dest_v1); 113 114 if (c->plan->normalized_coords) 115 instancing_update_fields (c->plan->head_maxp_info, dest_v1); 116 } 117 118 return_trace (true); 119 } 120 121 void instancing_update_fields (head_maxp_info_t& maxp_info, maxpV1Tail* dest_v1) const 122 { 123 dest_v1->maxPoints = maxp_info.maxPoints; 124 dest_v1->maxContours = maxp_info.maxContours; 125 dest_v1->maxCompositePoints = maxp_info.maxCompositePoints; 126 dest_v1->maxCompositeContours = maxp_info.maxCompositeContours; 127 dest_v1->maxComponentElements = maxp_info.maxComponentElements; 128 dest_v1->maxComponentDepth = maxp_info.maxComponentDepth; 129 } 130 131 static void drop_hint_fields (maxpV1Tail* dest_v1) 132 { 133 dest_v1->maxZones = 1; 134 dest_v1->maxTwilightPoints = 0; 135 dest_v1->maxStorage = 0; 136 dest_v1->maxFunctionDefs = 0; 137 dest_v1->maxInstructionDefs = 0; 138 dest_v1->maxStackElements = 0; 139 dest_v1->maxSizeOfInstructions = 0; 140 } 141 142 protected: 143 FixedVersion<>version;/* Version of the maxp table (0.5 or 1.0), 144 * 0x00005000u or 0x00010000u. */ 145 HBUINT16 numGlyphs; 146 /* The number of glyphs in the font. */ 147 /*maxpV1Tail v1Tail[HB_VAR_ARRAY]; */ 148 public: 149 DEFINE_SIZE_STATIC (6); 150 }; 151 152 153 } /* namespace OT */ 154 155 156 #endif /* HB_OT_MAXP_TABLE_HH */