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_LAYOUT_ANKR_TABLE_HH 26 #define HB_AAT_LAYOUT_ANKR_TABLE_HH 27 28 #include "hb-aat-layout-common.hh" 29 30 /* 31 * ankr -- Anchor Point 32 * https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6ankr.html 33 */ 34 #define HB_AAT_TAG_ankr HB_TAG('a','n','k','r') 35 36 37 namespace AAT { 38 39 using namespace OT; 40 41 42 struct Anchor 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 public: 51 FWORD xCoordinate; 52 FWORD yCoordinate; 53 public: 54 DEFINE_SIZE_STATIC (4); 55 }; 56 57 typedef LArrayOf<Anchor> GlyphAnchors; 58 59 struct ankr 60 { 61 enum { tableTag = HB_AAT_TAG_ankr }; 62 63 const Anchor &get_anchor (hb_codepoint_t glyph_id, 64 unsigned int i, 65 unsigned int num_glyphs, 66 const char *end) const 67 { 68 const Offset<HBUINT16, false> *offset = (this+lookupTable).get_value (glyph_id, num_glyphs); 69 if (!offset) 70 return Null(Anchor); 71 const GlyphAnchors &anchors = StructAtOffset<GlyphAnchors> (&(this+anchorData), *offset); 72 /* TODO Use sanitizer; to avoid overflows and more. */ 73 if (unlikely ((const char *) &anchors + anchors.get_size () > end)) 74 return Null(Anchor); 75 return anchors[i]; 76 } 77 78 bool sanitize (hb_sanitize_context_t *c) const 79 { 80 TRACE_SANITIZE (this); 81 return_trace (likely (c->check_struct (this) && 82 version == 0 && 83 lookupTable.sanitize (c, this))); 84 } 85 86 protected: 87 HBUINT16 version; /* Version number (set to zero) */ 88 HBUINT16 flags; /* Flags (currently unused; set to zero) */ 89 LOffsetTo<Lookup<Offset<HBUINT16, false> >, false> 90 lookupTable; /* Offset to the table's lookup table */ 91 LOffsetTo<HBUINT8, false> 92 anchorData; /* Offset to the glyph data table */ 93 94 public: 95 DEFINE_SIZE_STATIC (12); 96 }; 97 98 } /* namespace AAT */ 99 100 101 #endif /* HB_AAT_LAYOUT_ANKR_TABLE_HH */ 102
