hb-aat-ltag-table.hh (2650B)
1 /* 2 * Copyright © 2018 Ebrahim Byagowi 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 25 #ifndef HB_AAT_LTAG_TABLE_HH 26 #define HB_AAT_LTAG_TABLE_HH 27 28 #include "hb-open-type.hh" 29 30 /* 31 * ltag -- Language Tag 32 * https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6ltag.html 33 */ 34 #define HB_AAT_TAG_ltag HB_TAG('l','t','a','g') 35 36 37 namespace AAT { 38 39 using namespace OT; 40 41 42 struct FTStringRange 43 { 44 friend struct ltag; 45 46 bool sanitize (hb_sanitize_context_t *c, const void *base) const 47 { 48 TRACE_SANITIZE (this); 49 return_trace (c->check_struct (this) && 50 hb_barrier () && 51 (base+tag).sanitize (c, length)); 52 } 53 54 protected: 55 NNOffset16To<UnsizedArrayOf<HBUINT8>> 56 tag; /* Offset from the start of the table to 57 * the beginning of the string */ 58 HBUINT16 length; /* String length (in bytes) */ 59 public: 60 DEFINE_SIZE_STATIC (4); 61 }; 62 63 struct ltag 64 { 65 static constexpr hb_tag_t tableTag = HB_AAT_TAG_ltag; 66 67 hb_language_t get_language (unsigned int i) const 68 { 69 const FTStringRange &range = tagRanges[i]; 70 return hb_language_from_string ((const char *) (this+range.tag).arrayZ, 71 range.length); 72 } 73 74 bool sanitize (hb_sanitize_context_t *c) const 75 { 76 TRACE_SANITIZE (this); 77 return_trace (likely (c->check_struct (this) && 78 hb_barrier () && 79 version >= 1 && 80 tagRanges.sanitize (c, this))); 81 } 82 83 protected: 84 HBUINT32 version; /* Table version; currently 1 */ 85 HBUINT32 flags; /* Table flags; currently none defined */ 86 Array32Of<FTStringRange> 87 tagRanges; /* Range for each tag's string */ 88 public: 89 DEFINE_SIZE_ARRAY (12, tagRanges); 90 }; 91 92 } /* namespace AAT */ 93 94 95 #endif /* HB_AAT_LTAG_TABLE_HH */