diff -r 000000000000 -r 6474c204b198 gfx/ots/src/layout.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gfx/ots/src/layout.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,76 @@
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef OTS_LAYOUT_H_
+#define OTS_LAYOUT_H_
+
+#include "ots.h"
+
+// Utility functions for OpenType layout common table formats.
+// http://www.microsoft.com/typography/otspec/chapter2.htm
+
+namespace ots {
+
+
+struct LookupSubtableParser {
+  struct TypeParser {
+    uint16_t type;
+    bool (*parse)(const OpenTypeFile *file, const uint8_t *data,
+                  const size_t length);
+  };
+  size_t num_types;
+  uint16_t extension_type;
+  const TypeParser *parsers;
+
+  bool Parse(const OpenTypeFile *file, const uint8_t *data,
+             const size_t length, const uint16_t lookup_type) const;
+};
+
+bool ParseScriptListTable(const ots::OpenTypeFile *file,
+                          const uint8_t *data, const size_t length,
+                          const uint16_t num_features);
+
+bool ParseFeatureListTable(const ots::OpenTypeFile *file,
+                           const uint8_t *data, const size_t length,
+                           const uint16_t num_lookups,
+                           uint16_t *num_features);
+
+bool ParseLookupListTable(OpenTypeFile *file, const uint8_t *data,
+                          const size_t length,
+                          const LookupSubtableParser* parser,
+                          uint16_t* num_lookups);
+
+bool ParseClassDefTable(const ots::OpenTypeFile *file,
+                        const uint8_t *data, size_t length,
+                        const uint16_t num_glyphs,
+                        const uint16_t num_classes);
+
+bool ParseCoverageTable(const ots::OpenTypeFile *file,
+                        const uint8_t *data, size_t length,
+                        const uint16_t num_glyphs,
+                        const uint16_t expected_num_glyphs = 0);
+
+bool ParseDeviceTable(const ots::OpenTypeFile *file,
+                      const uint8_t *data, size_t length);
+
+// Parser for 'Contextual' subtable shared by GSUB/GPOS tables.
+bool ParseContextSubtable(const ots::OpenTypeFile *file,
+                          const uint8_t *data, const size_t length,
+                          const uint16_t num_glyphs,
+                          const uint16_t num_lookups);
+
+// Parser for 'Chaining Contextual' subtable shared by GSUB/GPOS tables.
+bool ParseChainingContextSubtable(const ots::OpenTypeFile *file,
+                                  const uint8_t *data, const size_t length,
+                                  const uint16_t num_glyphs,
+                                  const uint16_t num_lookups);
+
+bool ParseExtensionSubtable(const OpenTypeFile *file,
+                            const uint8_t *data, const size_t length,
+                            const LookupSubtableParser* parser);
+
+}  // namespace ots
+
+#endif  // OTS_LAYOUT_H_
+