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 svgDoc.sanitize (c, base, svgDocLength)); 60 } 61 62 protected: 63 HBUINT16 startGlyphID; /* The first glyph ID in the range described by 64 * this index entry. */ 65 HBUINT16 endGlyphID; /* The last glyph ID in the range described by 66 * this index entry. Must be >= startGlyphID. */ 67 NNOffset32To<UnsizedArrayOf<HBUINT8>> 68 svgDoc; /* Offset from the beginning of the SVG Document Index 69 * to an SVG document. Must be non-zero. */ 70 HBUINT32 svgDocLength; /* Length of the SVG document. 71 * Must be non-zero. */ 72 public: 73 DEFINE_SIZE_STATIC (12); 74 }; 75 76 struct SVG 77 { 78 static constexpr hb_tag_t tableTag = HB_OT_TAG_SVG; 79 has_dataOT::SVG80 bool has_data () const { return svgDocEntries; } 81 82 struct accelerator_t 83 { accelerator_tOT::SVG::accelerator_t84 accelerator_t (hb_face_t *face) 85 { table = hb_sanitize_context_t ().reference_table<SVG> (face); } ~accelerator_tOT::SVG::accelerator_t86 ~accelerator_t () { table.destroy (); } 87 reference_blob_for_glyphOT::SVG::accelerator_t88 hb_blob_t *reference_blob_for_glyph (hb_codepoint_t glyph_id) const 89 { 90 return table->get_glyph_entry (glyph_id).reference_blob (table.get_blob (), 91 table->svgDocEntries); 92 } 93 has_dataOT::SVG::accelerator_t94 bool has_data () const { return table->has_data (); } 95 paint_glyphOT::SVG::accelerator_t96 bool paint_glyph (hb_font_t *font HB_UNUSED, hb_codepoint_t glyph, hb_paint_funcs_t *funcs, void *data) const 97 { 98 if (!has_data ()) 99 return false; 100 101 hb_blob_t *blob = reference_blob_for_glyph (glyph); 102 103 if (blob == hb_blob_get_empty ()) 104 return false; 105 106 funcs->image (data, 107 blob, 108 0, 0, 109 HB_PAINT_IMAGE_FORMAT_SVG, 110 font->slant_xy, 111 nullptr); 112 113 hb_blob_destroy (blob); 114 return true; 115 } 116 117 private: 118 hb_blob_ptr_t<SVG> table; 119 public: 120 DEFINE_SIZE_STATIC (sizeof (hb_blob_ptr_t<SVG>)); 121 }; 122 get_glyph_entryOT::SVG123 const SVGDocumentIndexEntry &get_glyph_entry (hb_codepoint_t glyph_id) const 124 { return (this+svgDocEntries).bsearch (glyph_id); } 125 sanitizeOT::SVG126 bool sanitize (hb_sanitize_context_t *c) const 127 { 128 TRACE_SANITIZE (this); 129 return_trace (likely (c->check_struct (this) && 130 (this+svgDocEntries).sanitize_shallow (c))); 131 } 132 133 protected: 134 HBUINT16 version; /* Table version (starting at 0). */ 135 Offset32To<SortedArray16Of<SVGDocumentIndexEntry>> 136 svgDocEntries; /* Offset (relative to the start of the SVG table) to the 137 * SVG Documents Index. Must be non-zero. */ 138 /* Array of SVG Document Index Entries. */ 139 HBUINT32 reserved; /* Set to 0. */ 140 public: 141 DEFINE_SIZE_STATIC (10); 142 }; 143 144 struct SVG_accelerator_t : SVG::accelerator_t { SVG_accelerator_tOT::SVG_accelerator_t145 SVG_accelerator_t (hb_face_t *face) : SVG::accelerator_t (face) {} 146 }; 147 148 } /* namespace OT */ 149 150 151 #endif /* OT_COLOR_SVG_SVG_HH */ 152