RangeRecord.hh (3303B)
1 /* 2 * Copyright © 2007,2008,2009 Red Hat, Inc. 3 * Copyright © 2010,2012 Google, Inc. 4 * 5 * This is part of HarfBuzz, a text shaping library. 6 * 7 * Permission is hereby granted, without written agreement and without 8 * license or royalty fees, to use, copy, modify, and distribute this 9 * software and its documentation for any purpose, provided that the 10 * above copyright notice and the following two paragraphs appear in 11 * all copies of this software. 12 * 13 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR 14 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES 15 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN 16 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH 17 * DAMAGE. 18 * 19 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, 20 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 21 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS 22 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO 23 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. 24 * 25 * Red Hat Author(s): Behdad Esfahbod 26 * Google Author(s): Behdad Esfahbod, Garret Rieger 27 */ 28 29 #ifndef OT_LAYOUT_COMMON_RANGERECORD_HH 30 #define OT_LAYOUT_COMMON_RANGERECORD_HH 31 32 namespace OT { 33 namespace Layout { 34 namespace Common { 35 36 template <typename Types> 37 struct RangeRecord 38 { 39 typename Types::HBGlyphID first; /* First GlyphID in the range */ 40 typename Types::HBGlyphID last; /* Last GlyphID in the range */ 41 HBUINT16 value; /* Value */ 42 43 DEFINE_SIZE_STATIC (2 + 2 * Types::size); 44 45 bool sanitize (hb_sanitize_context_t *c) const 46 { 47 TRACE_SANITIZE (this); 48 return_trace (c->check_struct (this)); 49 } 50 51 int cmp (hb_codepoint_t g) const 52 { return g < first ? -1 : g <= last ? 0 : +1; } 53 54 HB_INTERNAL static int cmp_range (const void *pa, const void *pb) { 55 const RangeRecord *a = (const RangeRecord *) pa; 56 const RangeRecord *b = (const RangeRecord *) pb; 57 if (a->first < b->first) return -1; 58 if (a->first > b->first) return +1; 59 if (a->last < b->last) return -1; 60 if (a->last > b->last) return +1; 61 if (a->value < b->value) return -1; 62 if (a->value > b->value) return +1; 63 return 0; 64 } 65 66 unsigned get_population () const 67 { 68 if (unlikely (last < first)) return 0; 69 return (last - first + 1); 70 } 71 72 bool intersects (const hb_set_t &glyphs) const 73 { return glyphs.intersects (first, last); } 74 75 template <typename set_t> 76 bool collect_coverage (set_t *glyphs) const 77 { return glyphs->add_range (first, last); } 78 }; 79 80 } 81 } 82 } 83 84 // TODO(garretrieger): This was previously implemented using 85 // DECLARE_NULL_NAMESPACE_BYTES_TEMPLATE1 (OT, RangeRecord, 9); 86 // but that only works when there is only a single namespace level. 87 // The macro should probably be fixed so it can work in this situation. 88 extern HB_INTERNAL const unsigned char _hb_Null_OT_RangeRecord[9]; 89 template <typename Spec> 90 struct Null<OT::Layout::Common::RangeRecord<Spec>> { 91 static OT::Layout::Common::RangeRecord<Spec> const & get_null () { 92 return *reinterpret_cast<const OT::Layout::Common::RangeRecord<Spec> *> (_hb_Null_OT_RangeRecord); 93 } 94 }; 95 96 97 #endif // #ifndef OT_LAYOUT_COMMON_RANGERECORD_HH