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// Copyright 2014 The PDFium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
#ifndef CORE_FPDFAPI_FONT_CFX_CTTGSUBTABLE_H_
#define CORE_FPDFAPI_FONT_CFX_CTTGSUBTABLE_H_
#include <stdint.h>
#include <optional>
#include <set>
#include <vector>
#include "core/fxcrt/data_vector.h"
#include "core/fxcrt/span.h"
#include "third_party/abseil-cpp/absl/types/variant.h"
class CFX_CTTGSUBTable {
public:
explicit CFX_CTTGSUBTable(pdfium::span<const uint8_t> gsub);
~CFX_CTTGSUBTable();
uint32_t GetVerticalGlyph(uint32_t glyphnum) const;
private:
using FeatureIndices = DataVector<uint16_t>;
using ScriptRecord = std::vector<FeatureIndices>;
struct FeatureRecord {
FeatureRecord();
~FeatureRecord();
uint32_t feature_tag = 0;
DataVector<uint16_t> lookup_list_indices;
};
struct RangeRecord {
RangeRecord();
uint16_t start = 0;
uint16_t end = 0;
uint16_t start_coverage_index = 0;
};
// GlyphArray for format 1.
// RangeRecords for format 2.
using CoverageFormat = absl::
variant<absl::monostate, DataVector<uint16_t>, std::vector<RangeRecord>>;
struct SubTable {
SubTable();
SubTable(const SubTable& that) = delete;
SubTable& operator=(const SubTable& that) = delete;
SubTable(SubTable&& that) noexcept;
SubTable& operator=(SubTable&& that) noexcept;
~SubTable();
CoverageFormat coverage;
// DeltaGlyphID for format 1.
// Substitutes for format 2.
absl::variant<absl::monostate, int16_t, DataVector<uint16_t>> table_data;
};
struct Lookup {
using SubTables = std::vector<SubTable>;
Lookup();
Lookup(const Lookup& that) = delete;
Lookup& operator=(const Lookup& that) = delete;
Lookup(Lookup&& that) noexcept;
Lookup& operator=(Lookup&& that) noexcept;
~Lookup();
uint16_t lookup_type = 0;
SubTables sub_tables;
};
bool LoadGSUBTable(pdfium::span<const uint8_t> gsub);
void Parse(pdfium::span<const uint8_t> scriptlist,
pdfium::span<const uint8_t> featurelist,
pdfium::span<const uint8_t> lookuplist);
void ParseScriptList(pdfium::span<const uint8_t> raw);
ScriptRecord ParseScript(pdfium::span<const uint8_t> raw);
FeatureIndices ParseLangSys(pdfium::span<const uint8_t> raw);
void ParseFeatureList(pdfium::span<const uint8_t> raw);
DataVector<uint16_t> ParseFeatureLookupListIndices(
pdfium::span<const uint8_t> raw);
void ParseLookupList(pdfium::span<const uint8_t> raw);
Lookup ParseLookup(pdfium::span<const uint8_t> raw);
CoverageFormat ParseCoverage(pdfium::span<const uint8_t> raw);
SubTable ParseSingleSubst(pdfium::span<const uint8_t> raw);
std::optional<uint32_t> GetVerticalGlyphSub(const FeatureRecord& feature,
uint32_t glyphnum) const;
std::optional<uint32_t> GetVerticalGlyphSub2(const Lookup& lookup,
uint32_t glyphnum) const;
int GetCoverageIndex(const CoverageFormat& coverage, uint32_t g) const;
uint8_t GetUInt8(pdfium::span<const uint8_t>& p) const;
int16_t GetInt16(pdfium::span<const uint8_t>& p) const;
uint16_t GetUInt16(pdfium::span<const uint8_t>& p) const;
int32_t GetInt32(pdfium::span<const uint8_t>& p) const;
uint32_t GetUInt32(pdfium::span<const uint8_t>& p) const;
std::set<uint32_t> feature_set_;
std::vector<ScriptRecord> script_list_;
std::vector<FeatureRecord> feature_list_;
std::vector<Lookup> lookup_list_;
};
#endif // CORE_FPDFAPI_FONT_CFX_CTTGSUBTABLE_H_