[ot-color] SVG table implementation (#874)

src/Makefile.sources

@@ -18,7 +18,6 @@ HB_BASE_sources = \
 	hb-open-file-private.hh \
 	hb-open-type-private.hh \
 	hb-ot-color-cbdt-table.hh \
-	hb-ot-color-sbix-table.hh \
 	hb-ot-cmap-table.hh \
 	hb-ot-glyf-table.hh \
 	hb-ot-hdmx-table.hh \
@@ -100,6 +99,8 @@ HB_OT_sources = \
 	hb-ot-color.cc \
 	hb-ot-color-colr-table.hh \
 	hb-ot-color-cpal-table.hh \
+	hb-ot-color-sbix-table.hh \
+	hb-ot-color-svg-table.hh \
 	hb-ot-map.cc \
 	hb-ot-map-private.hh \
 	hb-ot-math.cc \

src/hb-ot-color-svg-table.hh

@@ -0,0 +1,111 @@
+/*
+ * Copyright © 2018  Ebrahim Byagowi
+ *
+ *  This is part of HarfBuzz, a text shaping library.
+ *
+ * Permission is hereby granted, without written agreement and without
+ * license or royalty fees, to use, copy, modify, and distribute this
+ * software and its documentation for any purpose, provided that the
+ * above copyright notice and the following two paragraphs appear in
+ * all copies of this software.
+ *
+ * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
+ * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
+ * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
+ * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
+ * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
+ * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
+ * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ */
+
+#ifndef HB_OT_COLOR_SVG_TABLE_HH
+#define HB_OT_COLOR_SVG_TABLE_HH
+
+#include "hb-open-type-private.hh"
+
+/*
+ * The SVG (Scalable Vector Graphics) table
+ * https://docs.microsoft.com/en-us/typography/opentype/spec/svg
+ */
+
+#define HB_OT_TAG_SVG HB_TAG('S','V','G',' ')
+
+namespace OT {
+
+
+struct SVGDocumentIndexEntry
+{
+  // friend struct SVGDocumentIndex;
+
+  inline bool sanitize (hb_sanitize_context_t *c, const void* base) const
+  {
+    TRACE_SANITIZE (this);
+    return_trace (c->check_struct (this) &&
+      c->check_range (&svgDoc (base), svgDocLength));
+  }
+
+  protected:
+  HBUINT16 startGlyphID;
+  HBUINT16 endGlyphID;
+  LOffsetTo<const uint8_t *> svgDoc;
+  HBUINT32 svgDocLength;
+  public:
+  DEFINE_SIZE_STATIC (12);
+};
+
+struct SVGDocumentIndex
+{
+  inline bool sanitize (hb_sanitize_context_t *c) const
+  {
+    TRACE_SANITIZE (this);
+    // dump ();
+    return_trace (c->check_struct (this) &&
+      entries.sanitize (c, this));
+  }
+
+  // inline void dump () const
+  // {
+  //   for (unsigned int i = 0; i < entries.len; ++i)
+  //   {
+  //     char outName[255];
+  //     sprintf (outName, "out/%d.svg", i);
+  //     const SVGDocumentIndexEntry &entry = entries[i];
+  //     FILE *f = fopen (outName, "wb");
+  //     fwrite (&entry.svgDoc (this), 1, entry.svgDocLength, f);
+  //     fclose (f);
+  //   }
+  // }
+
+  protected:
+  ArrayOf<SVGDocumentIndexEntry> entries;
+  public:
+  DEFINE_SIZE_ARRAY (2, entries);
+};
+
+struct SVG
+{
+  static const hb_tag_t tableTag = HB_OT_TAG_SVG;
+
+  inline bool sanitize (hb_sanitize_context_t *c) const
+  {
+    TRACE_SANITIZE (this);
+    return_trace (c->check_struct (this) &&
+      svgDocIndex(this).sanitize (c));
+  }
+
+  protected:
+  HBUINT16	version;
+  LOffsetTo<SVGDocumentIndex>	svgDocIndex;
+  HBUINT32	reserved;
+  public:
+  DEFINE_SIZE_STATIC (10);
+};
+
+} /* namespace OT */
+
+
+#endif /* HB_OT_COLOR_SVG_TABLE_HH */

src/hb-ot-layout.cc

@@ -40,6 +40,7 @@
 #include "hb-ot-color-colr-table.hh"
 #include "hb-ot-color-cpal-table.hh"
 #include "hb-ot-color-sbix-table.hh" // Just so we compile it; unused otherwise.
+#include "hb-ot-color-svg-table.hh" // Just so we compile it; unused otherwise.
 
 #include "hb-ot-map-private.hh"