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_OT_COLOR_SVG_TABLE_HH 26 #define HB_OT_COLOR_SVG_TABLE_HH 27 28 #include "hb-open-type.hh" 29 30 /* 31 * SVG -- SVG (Scalable Vector Graphics) 32 * https://docs.microsoft.com/en-us/typography/opentype/spec/svg 33 */ 34 35 #define HB_OT_TAG_SVG HB_TAG('S','V','G',' ') 36 37 38 namespace OT { 39 40 41 struct SVGDocumentIndexEntry 42 { 43 int cmp (hb_codepoint_t g) const 44 { return g < startGlyphID ? -1 : g > endGlyphID ? 1 : 0; } 45 46 hb_blob_t *reference_blob (hb_blob_t *svg_blob, unsigned int index_offset) const 47 { 48 return hb_blob_create_sub_blob (svg_blob, 49 index_offset + (unsigned int) svgDoc, 50 svgDocLength); 51 } 52 53 bool sanitize (hb_sanitize_context_t *c, const void *base) const 54 { 55 TRACE_SANITIZE (this); 56 return_trace (c->check_struct (this) && 57 svgDoc.sanitize (c, base, svgDocLength)); 58 } 59 60 protected: 61 HBUINT16 startGlyphID; /* The first glyph ID in the range described by 62 * this index entry. */ 63 HBUINT16 endGlyphID; /* The last glyph ID in the range described by 64 * this index entry. Must be >= startGlyphID. */ 65 LOffsetTo<UnsizedArrayOf<HBUINT8>, false> 66 svgDoc; /* Offset from the beginning of the SVG Document Index 67 * to an SVG document. Must be non-zero. */ 68 HBUINT32 svgDocLength; /* Length of the SVG document. 69 * Must be non-zero. */ 70 public: 71 DEFINE_SIZE_STATIC (12); 72 }; 73 74 struct SVG 75 { 76 enum { tableTag = HB_OT_TAG_SVG }; 77 78 bool has_data () const { return svgDocEntries; } 79 80 struct accelerator_t 81 { 82 void init (hb_face_t *face) 83 { table = hb_sanitize_context_t().reference_table<SVG> (face); } 84 void fini () { table.destroy (); } 85 86 hb_blob_t *reference_blob_for_glyph (hb_codepoint_t glyph_id) const 87 { 88 return table->get_glyph_entry (glyph_id).reference_blob (table.get_blob (), 89 table->svgDocEntries); 90 } 91 92 bool has_data () const { return table->has_data (); } 93 94 private: 95 hb_blob_ptr_t<SVG> table; 96 }; 97 98 const SVGDocumentIndexEntry &get_glyph_entry (hb_codepoint_t glyph_id) const 99 { return (this+svgDocEntries).bsearch (glyph_id); } 100 101 bool sanitize (hb_sanitize_context_t *c) const 102 { 103 TRACE_SANITIZE (this); 104 return_trace (likely (c->check_struct (this) && 105 (this+svgDocEntries).sanitize_shallow (c))); 106 } 107 108 protected: 109 HBUINT16 version; /* Table version (starting at 0). */ 110 LOffsetTo<SortedArrayOf<SVGDocumentIndexEntry> > 111 svgDocEntries; /* Offset (relative to the start of the SVG table) to the 112 * SVG Documents Index. Must be non-zero. */ 113 /* Array of SVG Document Index Entries. */ 114 HBUINT32 reserved; /* Set to 0. */ 115 public: 116 DEFINE_SIZE_STATIC (10); 117 }; 118 119 struct SVG_accelerator_t : SVG::accelerator_t {}; 120 121 } /* namespace OT */ 122 123 124 #endif /* HB_OT_COLOR_SVG_TABLE_HH */ 125
