src/third_party/ots/src/cmap.h

// 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_CMAP_H_
#define OTS_CMAP_H_

#include <vector>

#include "ots.h"

namespace ots {

struct OpenTypeCMAPSubtableRange {
  uint32_t start_range;
  uint32_t end_range;
  uint32_t start_glyph_id;
};

struct OpenTypeCMAPSubtableVSRange {
  uint32_t unicode_value;
  uint8_t additional_count;
};

struct OpenTypeCMAPSubtableVSMapping {
  uint32_t unicode_value;
  uint16_t glyph_id;
};

struct OpenTypeCMAPSubtableVSRecord {
  uint32_t var_selector;
  uint32_t default_offset;
  uint32_t non_default_offset;
  std::vector<OpenTypeCMAPSubtableVSRange> ranges;
  std::vector<OpenTypeCMAPSubtableVSMapping> mappings;
};

class OpenTypeCMAP : public Table {
 public:
  explicit OpenTypeCMAP(Font *font, uint32_t tag)
      : Table(font, tag, tag),
        subtable_0_3_4_data(NULL),
        subtable_0_3_4_length(0),
        subtable_0_5_14_length(0),
        subtable_3_0_4_data(NULL),
        subtable_3_0_4_length(0),
        subtable_3_1_4_data(NULL),
        subtable_3_1_4_length(0) {
  }

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

 private:
  // Platform 0, Encoding 3, Format 4, Unicode BMP table.
  const uint8_t *subtable_0_3_4_data;
  size_t subtable_0_3_4_length;

  // Platform 0, Encoding 5, Format 14, Unicode Variation Sequence table.
  size_t subtable_0_5_14_length;
  std::vector<OpenTypeCMAPSubtableVSRecord> subtable_0_5_14;

  // Platform 3, Encoding 0, Format 4, MS Symbol table.
  const uint8_t *subtable_3_0_4_data;
  size_t subtable_3_0_4_length;
  // Platform 3, Encoding 1, Format 4, MS Unicode BMP table.
  const uint8_t *subtable_3_1_4_data;
  size_t subtable_3_1_4_length;

  // Platform 3, Encoding 10, Format 12, MS Unicode UCS-4 table.
  std::vector<OpenTypeCMAPSubtableRange> subtable_3_10_12;
  // Platform 3, Encoding 10, Format 13, MS UCS-4 Fallback table.
  std::vector<OpenTypeCMAPSubtableRange> subtable_3_10_13;
  // Platform 1, Encoding 0, Format 0, Mac Roman table.
  std::vector<uint8_t> subtable_1_0_0;

  bool ParseFormat4(int platform, int encoding, const uint8_t *data,
                    size_t length, uint16_t num_glyphs);
  bool Parse31012(const uint8_t *data, size_t length, uint16_t num_glyphs);
  bool Parse31013(const uint8_t *data, size_t length, uint16_t num_glyphs);
  bool Parse0514(const uint8_t *data, size_t length, uint16_t num_glyphs);
  bool Parse100(const uint8_t *data, size_t length);
};

}  // namespace ots

#endif