[aat] Implement gcid table parsing (#944)

src/Makefile.sources

@@ -87,6 +87,7 @@ HB_OT_sources = \
 	hb-aat-layout-morx-table.hh \
 	hb-aat-layout-trak-table.hh \
 	hb-aat-fmtx-table.hh \
+	hb-aat-gcid-table.hh \
 	hb-aat-ltag-table.hh \
 	hb-aat-layout-private.hh \
 	hb-ot-font.cc \

src/hb-aat-gcid-table.hh

@@ -0,0 +1,73 @@
+/*
+ * 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_AAT_GCID_TABLE_HH
+#define HB_AAT_GCID_TABLE_HH
+
+#include "hb-aat-layout-common-private.hh"
+
+#define HB_AAT_TAG_gcid HB_TAG('g','c','i','d')
+
+
+namespace AAT {
+
+/*
+ * gcid -- Glyphs CIDs
+ * https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6gcid.html
+ */
+
+struct gcid
+{
+  static const hb_tag_t tableTag = HB_AAT_TAG_gcid;
+
+  inline bool sanitize (hb_sanitize_context_t *c) const
+  {
+    TRACE_SANITIZE (this);
+    return_trace (c->check_struct (this) && CIDs.sanitize (c));
+  }
+
+  protected:
+  HBUINT16	version;	/* Version number (set to 0) */
+  HBUINT16	format;		/* Data format (set to 0) */
+  HBUINT32	size;		/* Size of the table, including header */
+  HBUINT16	registry;	/* The registry ID */
+  uint8_t	registryName[64];
+				/* The registry name in ASCII */
+  HBUINT16	order;		/* The order ID */
+  uint8_t	orderName[64];	/* The order name in ASCII */
+  HBUINT16	supplementVersion;
+				/* The supplement version */
+  ArrayOf<HBUINT16>
+		CIDs;		/* The CIDs for the glyphs in the font,
+				 * starting with glyph 0. If a glyph does not correspond
+				 * to a CID in the identified collection, 0xFFFF is used.
+				 * This should not exceed the number of glyphs in the font. */
+  public:
+  DEFINE_SIZE_ARRAY (144, CIDs);
+};
+
+} /* namespace AAT */
+
+
+#endif /* HB_AAT_GCID_TABLE_HH */

src/hb-aat-layout.cc

@@ -36,6 +36,7 @@
 #include "hb-aat-layout-morx-table.hh"
 #include "hb-aat-layout-trak-table.hh"
 #include "hb-aat-fmtx-table.hh" // Just so we compile it; unused otherwise.
+#include "hb-aat-gcid-table.hh" // Just so we compile it; unused otherwise.
 #include "hb-aat-ltag-table.hh" // Just so we compile it; unused otherwise.
 
 /*