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-private.hh" 31 #include "hb-subset-plan.hh" 32 33 namespace OT { 34 35 36 /* 37 * maxp -- The Maximum Profile Table 38 */ 39 40 #define HB_OT_TAG_maxp HB_TAG('m','a','x','p') 41 42 struct maxpV1Tail 43 { sanitizeOT::maxpV1Tail44 inline 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 const hb_tag_t tableTag = HB_OT_TAG_maxp; 75 get_num_glyphsOT::maxp76 inline unsigned int get_num_glyphs (void) const 77 { 78 return numGlyphs; 79 } 80 set_num_glyphsOT::maxp81 inline void set_num_glyphs (unsigned int count) 82 { 83 numGlyphs.set (count); 84 } 85 sanitizeOT::maxp86 inline bool sanitize (hb_sanitize_context_t *c) const 87 { 88 TRACE_SANITIZE (this); 89 if (unlikely (!c->check_struct (this))) 90 return_trace (false); 91 92 if (version.major == 1) 93 { 94 const maxpV1Tail &v1 = StructAfter<maxpV1Tail> (*this); 95 return v1.sanitize (c); 96 } 97 return_trace (likely (version.major == 0 && version.minor == 0x5000u)); 98 } 99 subsetOT::maxp100 inline bool subset (hb_subset_plan_t *plan) const 101 { 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); 105 106 if (unlikely (!maxp_prime_blob)) { 107 return false; 108 } 109 OT::maxp *maxp_prime = (OT::maxp *) hb_blob_get_data (maxp_prime_blob, nullptr); 110 111 maxp_prime->set_num_glyphs (plan->gids_to_retain_sorted.len); 112 if (plan->drop_hints) 113 drop_hint_fields (plan, maxp_prime); 114 115 bool result = hb_subset_plan_add_table(plan, HB_OT_TAG_maxp, maxp_prime_blob); 116 hb_blob_destroy (maxp_prime_blob); 117 return result; 118 } 119 drop_hint_fieldsOT::maxp120 static inline void drop_hint_fields (hb_subset_plan_t *plan, OT::maxp *maxp_prime) 121 { 122 if (maxp_prime->version.major == 1) 123 { 124 maxpV1Tail &v1 = StructAfter<maxpV1Tail> (*maxp_prime); 125 v1.maxZones.set (1); 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); 132 } 133 } 134 135 protected: 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]; */ 140 public: 141 DEFINE_SIZE_STATIC (6); 142 }; 143 144 145 } /* namespace OT */ 146 147 148 #endif /* HB_OT_MAXP_TABLE_HH */ 149