// Copyright (c) 2009-2017 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_FEAT_H_

#define OTS_FEAT_H_

#include <vector>

#include <unordered_set>

#include "ots.h"

#include "graphite.h"

namespace ots {

class OpenTypeFEAT : public Table {

 public:

  explicit OpenTypeFEAT(Font* font, uint32_t tag)

      : Table(font, tag, tag) { }

  bool Parse(const uint8_t* data, size_t length);

  bool Serialize(OTSStream* out);

  bool IsValidFeatureId(uint32_t id) const;

 private:

  struct FeatureDefn : public TablePart<OpenTypeFEAT> {

    explicit FeatureDefn(OpenTypeFEAT* parent)

        : TablePart<OpenTypeFEAT>(parent) { }

    bool ParsePart(Buffer& table);

    bool SerializePart(OTSStream* out) const;

    uint32_t id;

    uint16_t numSettings;

    uint16_t reserved;

    uint32_t offset;

    uint16_t flags;

    static const uint16_t HAS_DEFAULT_SETTING = 0x4000;

    static const uint16_t RESERVED = 0x3700;

    static const uint16_t DEFAULT_SETTING = 0x00FF;

    uint16_t label;

  };

  struct FeatureSettingDefn : public TablePart<OpenTypeFEAT> {

    explicit FeatureSettingDefn(OpenTypeFEAT* parent)

        : TablePart<OpenTypeFEAT>(parent) { }

    bool ParsePart(Buffer& table) { return ParsePart(table, true); }

    bool ParsePart(Buffer& table, bool used);

    bool SerializePart(OTSStream* out) const;

    int16_t value;

    uint16_t label;

  };

  uint32_t version;

  uint16_t numFeat;

  uint16_t reserved;

  uint32_t reserved2;

  std::vector<FeatureDefn> features;

  std::vector<FeatureSettingDefn> featSettings;

  std::unordered_set<uint32_t> feature_ids;

};

}  // namespace ots

#endif  // OTS_FEAT_H_