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 OT_COLOR_SVG_SVG_HH 26 #define OT_COLOR_SVG_SVG_HH 27 28 #include "../../../hb-open-type.hh" 29 #include "../../../hb-blob.hh" 30 #include "../../../hb-paint.hh" 31 32 /* 33 * SVG -- SVG (Scalable Vector Graphics) 34 * https://docs.microsoft.com/en-us/typography/opentype/spec/svg 35 */ 36 37 #define HB_OT_TAG_SVG HB_TAG('S','V','G',' ') 38 39 40 namespace OT { 41 42 43 struct SVGDocumentIndexEntry 44 { cmpOT::SVGDocumentIndexEntry45 int cmp (hb_codepoint_t g) const 46 { return g < startGlyphID ? -1 : g > endGlyphID ? 1 : 0; } 47 reference_blobOT::SVGDocumentIndexEntry48 hb_blob_t *reference_blob (hb_blob_t *svg_blob, unsigned int index_offset) const 49 { 50 return hb_blob_create_sub_blob (svg_blob, 51 index_offset + (unsigned int) svgDoc, 52 svgDocLength); 53 } 54 sanitizeOT::SVGDocumentIndexEntry55 bool sanitize (hb_sanitize_context_t *c, const void *base) const 56 { 57 TRACE_SANITIZE (this); 58 return_trace (c->check_struct (this) && 59 hb_barrier () && 60 svgDoc.sanitize (c, base, svgDocLength)); 61 } 62 63 protected: 64 HBUINT16 startGlyphID; /* The first glyph ID in the range described by 65 * this index entry. */ 66 HBUINT16 endGlyphID; /* The last glyph ID in the range described by 67 * this index entry. Must be >= startGlyphID. */ 68 NNOffset32To<UnsizedArrayOf<HBUINT8>> 69 svgDoc; /* Offset from the beginning of the SVG Document Index 70 * to an SVG document. Must be non-zero. */ 71 HBUINT32 svgDocLength; /* Length of the SVG document. 72 * Must be non-zero. */ 73 public: 74 DEFINE_SIZE_STATIC (12); 75 }; 76 77 struct SVG 78 { 79 static constexpr hb_tag_t tableTag = HB_OT_TAG_SVG; 80 has_dataOT::SVG81 bool has_data () const { return svgDocEntries; } 82 83 struct accelerator_t 84 { accelerator_tOT::SVG::accelerator_t85 accelerator_t (hb_face_t *face) 86 { table = hb_sanitize_context_t ().reference_table<SVG> (face); } ~accelerator_tOT::SVG::accelerator_t87 ~accelerator_t () { table.destroy (); } 88 reference_blob_for_glyphOT::SVG::accelerator_t89 hb_blob_t *reference_blob_for_glyph (hb_codepoint_t glyph_id) const 90 { 91 return table->get_glyph_entry (glyph_id).reference_blob (table.get_blob (), 92 table->svgDocEntries); 93 } 94 has_dataOT::SVG::accelerator_t95 bool has_data () const { return table->has_data (); } 96 paint_glyphOT::SVG::accelerator_t97 bool paint_glyph (hb_font_t *font HB_UNUSED, hb_codepoint_t glyph, hb_paint_funcs_t *funcs, void *data) const 98 { 99 if (!has_data ()) 100 return false; 101 102 hb_blob_t *blob = reference_blob_for_glyph (glyph); 103 104 if (blob == hb_blob_get_empty ()) 105 return false; 106 107 funcs->image (data, 108 blob, 109 0, 0, 110 HB_PAINT_IMAGE_FORMAT_SVG, 111 font->slant_xy, 112 nullptr); 113 114 hb_blob_destroy (blob); 115 return true; 116 } 117 118 private: 119 hb_blob_ptr_t<SVG> table; 120 public: 121 DEFINE_SIZE_STATIC (sizeof (hb_blob_ptr_t<SVG>)); 122 }; 123 get_glyph_entryOT::SVG124 const SVGDocumentIndexEntry &get_glyph_entry (hb_codepoint_t glyph_id) const 125 { return (this+svgDocEntries).bsearch (glyph_id); } 126 sanitizeOT::SVG127 bool sanitize (hb_sanitize_context_t *c) const 128 { 129 TRACE_SANITIZE (this); 130 return_trace (likely (c->check_struct (this) && 131 (this+svgDocEntries).sanitize_shallow (c))); 132 } 133 134 protected: 135 HBUINT16 version; /* Table version (starting at 0). */ 136 Offset32To<SortedArray16Of<SVGDocumentIndexEntry>> 137 svgDocEntries; /* Offset (relative to the start of the SVG table) to the 138 * SVG Documents Index. Must be non-zero. */ 139 /* Array of SVG Document Index Entries. */ 140 HBUINT32 reserved; /* Set to 0. */ 141 public: 142 DEFINE_SIZE_STATIC (10); 143 }; 144 145 struct SVG_accelerator_t : SVG::accelerator_t { SVG_accelerator_tOT::SVG_accelerator_t146 SVG_accelerator_t (hb_face_t *face) : SVG::accelerator_t (face) {} 147 }; 148 149 } /* namespace OT */ 150 151 152 #endif /* OT_COLOR_SVG_SVG_HH */ 153