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// Copyright (c) 2011-2017 The OTS 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 {
// The maximum number of class value.
const uint16_t kMaxClassDefValue = 0xFFFF;
struct LookupSubtableParser {
struct TypeParser {
uint16_t type;
bool (*parse)(const Font *font, const uint8_t *data,
const size_t length);
};
size_t num_types;
uint16_t extension_type;
const TypeParser *parsers;
bool Parse(const Font *font, const uint8_t *data,
const size_t length, const uint16_t lookup_type) const;
};
bool ParseScriptListTable(const ots::Font *font,
const uint8_t *data, const size_t length,
const uint16_t num_features);
bool ParseFeatureListTable(const ots::Font *font,
const uint8_t *data, const size_t length,
const uint16_t num_lookups,
uint16_t *num_features);
bool ParseLookupListTable(Font *font, const uint8_t *data,
const size_t length,
const LookupSubtableParser* parser,
uint16_t* num_lookups);
bool ParseClassDefTable(const ots::Font *font,
const uint8_t *data, size_t length,
const uint16_t num_glyphs,
const uint16_t num_classes);
bool ParseCoverageTable(const ots::Font *font,
const uint8_t *data, size_t length,
const uint16_t num_glyphs,
const uint16_t expected_num_glyphs = 0);
bool ParseDeviceTable(const ots::Font *font,
const uint8_t *data, size_t length);
// Parser for 'Contextual' subtable shared by GSUB/GPOS tables.
bool ParseContextSubtable(const ots::Font *font,
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::Font *font,
const uint8_t *data, const size_t length,
const uint16_t num_glyphs,
const uint16_t num_lookups);
bool ParseExtensionSubtable(const Font *font,
const uint8_t *data, const size_t length,
const LookupSubtableParser* parser);
// For feature variations table (in GSUB/GPOS v1.1)
bool ParseConditionTable(const Font *font,
const uint8_t *data, const size_t length,
const uint16_t axis_count);
bool ParseConditionSetTable(const Font *font,
const uint8_t *data, const size_t length,
const uint16_t axis_count);
bool ParseFeatureTableSubstitutionTable(const Font *font,
const uint8_t *data, const size_t length,
const uint16_t num_lookups);
bool ParseFeatureVariationsTable(const Font *font,
const uint8_t *data, const size_t length,
const uint16_t num_lookups);
} // namespace ots
#endif // OTS_LAYOUT_H_
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