michael@0: // Copyright (c) 2011 The Chromium Authors. All rights reserved.
michael@0: // Use of this source code is governed by a BSD-style license that can be
michael@0: // found in the LICENSE file.
michael@0: 
michael@0: #ifndef OTS_LAYOUT_H_
michael@0: #define OTS_LAYOUT_H_
michael@0: 
michael@0: #include "ots.h"
michael@0: 
michael@0: // Utility functions for OpenType layout common table formats.
michael@0: // http://www.microsoft.com/typography/otspec/chapter2.htm
michael@0: 
michael@0: namespace ots {
michael@0: 
michael@0: 
michael@0: struct LookupSubtableParser {
michael@0:   struct TypeParser {
michael@0:     uint16_t type;
michael@0:     bool (*parse)(const OpenTypeFile *file, const uint8_t *data,
michael@0:                   const size_t length);
michael@0:   };
michael@0:   size_t num_types;
michael@0:   uint16_t extension_type;
michael@0:   const TypeParser *parsers;
michael@0: 
michael@0:   bool Parse(const OpenTypeFile *file, const uint8_t *data,
michael@0:              const size_t length, const uint16_t lookup_type) const;
michael@0: };
michael@0: 
michael@0: bool ParseScriptListTable(const ots::OpenTypeFile *file,
michael@0:                           const uint8_t *data, const size_t length,
michael@0:                           const uint16_t num_features);
michael@0: 
michael@0: bool ParseFeatureListTable(const ots::OpenTypeFile *file,
michael@0:                            const uint8_t *data, const size_t length,
michael@0:                            const uint16_t num_lookups,
michael@0:                            uint16_t *num_features);
michael@0: 
michael@0: bool ParseLookupListTable(OpenTypeFile *file, const uint8_t *data,
michael@0:                           const size_t length,
michael@0:                           const LookupSubtableParser* parser,
michael@0:                           uint16_t* num_lookups);
michael@0: 
michael@0: bool ParseClassDefTable(const ots::OpenTypeFile *file,
michael@0:                         const uint8_t *data, size_t length,
michael@0:                         const uint16_t num_glyphs,
michael@0:                         const uint16_t num_classes);
michael@0: 
michael@0: bool ParseCoverageTable(const ots::OpenTypeFile *file,
michael@0:                         const uint8_t *data, size_t length,
michael@0:                         const uint16_t num_glyphs,
michael@0:                         const uint16_t expected_num_glyphs = 0);
michael@0: 
michael@0: bool ParseDeviceTable(const ots::OpenTypeFile *file,
michael@0:                       const uint8_t *data, size_t length);
michael@0: 
michael@0: // Parser for 'Contextual' subtable shared by GSUB/GPOS tables.
michael@0: bool ParseContextSubtable(const ots::OpenTypeFile *file,
michael@0:                           const uint8_t *data, const size_t length,
michael@0:                           const uint16_t num_glyphs,
michael@0:                           const uint16_t num_lookups);
michael@0: 
michael@0: // Parser for 'Chaining Contextual' subtable shared by GSUB/GPOS tables.
michael@0: bool ParseChainingContextSubtable(const ots::OpenTypeFile *file,
michael@0:                                   const uint8_t *data, const size_t length,
michael@0:                                   const uint16_t num_glyphs,
michael@0:                                   const uint16_t num_lookups);
michael@0: 
michael@0: bool ParseExtensionSubtable(const OpenTypeFile *file,
michael@0:                             const uint8_t *data, const size_t length,
michael@0:                             const LookupSubtableParser* parser);
michael@0: 
michael@0: }  // namespace ots
michael@0: 
michael@0: #endif  // OTS_LAYOUT_H_
michael@0: