layout.h - mozsearch

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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_