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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;
class OpenTypeLayoutTable : public Table {
public:
explicit OpenTypeLayoutTable(Font *font, uint32_t tag, uint32_t type)
: Table(font, tag, type) { }
bool Parse(const uint8_t *data, size_t length);
bool Serialize(OTSStream *out);
protected:
bool ParseContextSubtable(const uint8_t *data, const size_t length);
bool ParseChainingContextSubtable(const uint8_t *data, const size_t length);
bool ParseExtensionSubtable(const uint8_t *data, const size_t length);
private:
bool ParseScriptListTable(const uint8_t *data, const size_t length);
bool ParseFeatureListTable(const uint8_t *data, const size_t length);
bool ParseLookupListTable(const uint8_t *data, const size_t length);
bool ParseFeatureVariationsTable(const uint8_t *data, const size_t length);
bool ParseLookupTable(const uint8_t *data, const size_t length);
virtual bool ValidLookupSubtableType(const uint16_t lookup_type,
bool extension = false) const = 0;
virtual bool ParseLookupSubtable(const uint8_t *data, const size_t length,
const uint16_t lookup_type) = 0;
const uint8_t *m_data = nullptr;
size_t m_length = 0;
uint16_t m_num_features = 0;
uint16_t m_num_lookups = 0;
};
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);
} // namespace ots
#endif // OTS_LAYOUT_H_
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