hb-aat-layout-ankr-table.hh (2788B)
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 Array32Of<Anchor> GlyphAnchors; 58 59 struct ankr 60 { 61 static constexpr hb_tag_t 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) const 66 { 67 const NNOffset16To<GlyphAnchors> *offset = (this+lookupTable).get_value (glyph_id, num_glyphs); 68 if (!offset) 69 return Null (Anchor); 70 const GlyphAnchors &anchors = &(this+anchorData) + *offset; 71 return anchors[i]; 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 == 0 && 80 c->check_range (this, anchorData) && 81 lookupTable.sanitize (c, this, &(this+anchorData)))); 82 } 83 84 protected: 85 HBUINT16 version; /* Version number (set to zero) */ 86 HBUINT16 flags; /* Flags (currently unused; set to zero) */ 87 Offset32To<Lookup<NNOffset16To<GlyphAnchors>>> 88 lookupTable; /* Offset to the table's lookup table */ 89 NNOffset32To<HBUINT8> 90 anchorData; /* Offset to the glyph data table */ 91 92 public: 93 DEFINE_SIZE_STATIC (12); 94 }; 95 96 } /* namespace AAT */ 97 98 99 #endif /* HB_AAT_LAYOUT_ANKR_TABLE_HH */