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 // 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_