blog/cpp/fonts/core/tables/cmap/tables.h

#ifndef __CMAP_TABLES_H__
#define __CMAP_TABLES_H__
#include <cstdint>
#include "../../../reader/reader.h"
#include <vector>
#include <math.h>
#include "../../../types/types.h"

#define list_uint16 std::vector<uint16_t>
#define list_uint8 std::vector<uint8_t>
#define list_int16 std::vector<int16_t>
class CmapTableBase
{
private:
    uint16_t _format;
    uint16_t _length;
    uint16_t _language;
    uint16_t _reserved;

public:
    CmapTableBase() : _format(0), _length(0), _language(0), _reserved(0) {};
    ~CmapTableBase() {};
    CmapTableBase(reader *rd) { read(rd); };
    void read(reader *rd)
    {
        _format = rd->readUint16();
        _reserved = 0;
        if (_format == 8 || _format == 10 || _format == 12 || _format == 13)
            _reserved = rd->readUint16();
        _length = rd->readUint16();
        if (_format == 14)
        {
            return;
        }
        _language = rd->readUint16();
    };
    uint16_t format() const { return _format; };
    uint16_t length() const { return _length; };
    uint16_t language() const { return _language; };
    virtual uint16 Format() = 0;
};

class CmapTable0 : public CmapTableBase
{
private:
    list_uint8 _glyphldArray;
    uint16_t _glyphldCount;

public:
    CmapTable0() : CmapTableBase(), _glyphldCount(256) {};
    ~CmapTable0() {};
    CmapTable0(reader *rd) : CmapTableBase(rd), _glyphldCount(256) { read(rd); };
    void read(reader *rd)
    {
        if (format() != 0)
            return;
        for (auto i = 0; i < _glyphldCount; i++)
        {
            uint8_t glyph = rd->readUint8();
            _glyphldArray.push_back(glyph);
        }
    };
    list_uint8 glyphldArray() const { return _glyphldArray; };
    uint16 Format()override{return format();}
};

class CmapTable2SubHeader
{
private:
    uint16_t _firstCode;
    uint16_t _entryCount;
    uint16_t _idDelta;
    uint16_t _idRangeOffset;

public:
    CmapTable2SubHeader() : _firstCode(0), _entryCount(0), _idDelta(0), _idRangeOffset(0) {};
    ~CmapTable2SubHeader() {};
    CmapTable2SubHeader(reader *rd) { read(rd); };
    void read(reader *rd)
    {
        _firstCode = rd->readUint16();
        _entryCount = rd->readUint16();
        _idDelta = rd->readUint16();
        _idRangeOffset = rd->readUint16();
    };
    uint16_t firstCode() const { return _firstCode; };
    uint16_t entryCount() const { return _entryCount; };
    uint16_t idDelta() const { return _idDelta; };
    uint16_t idRangeOffset() const { return _idRangeOffset; };
};
// 不常用
class CmapTable2 : public CmapTableBase
{
private:
    list_uint16 _subHeaderKey;
    std::vector<CmapTable2SubHeader> _subHeader;
    list_uint16 _glyphldArray;
    uint16_t _searchHeaderKeyCount;

public:
    CmapTable2() : _searchHeaderKeyCount(256) {};
    ~CmapTable2() {};
    CmapTable2(reader *rd) : CmapTableBase(rd), _searchHeaderKeyCount(256) { read(rd); };
    void read(reader *rd)
    {
        if (format() != 2)
            return;
    }; // 计算很复杂
    list_uint16 subHeaderKey() const { return _subHeaderKey; };
    std::vector<CmapTable2SubHeader> subHeader() { return _subHeader; };
    list_uint16 glyphldArray() const { return _glyphldArray; };
    uint16 Format()override{return format();}
};

class CmapTable4 : public CmapTableBase
{
private:
    uint16_t _segCountX2;
    uint16_t _segCount;
    uint16_t _searchRange;
    uint16_t _entrySelector;
    uint16_t _rangeShift;
    list_uint16 _endCode;
    uint16_t _reservedPad;
    list_uint16 _startCode;
    list_int16 _idDelta;
    list_uint16 _idRangeOffset;
    list_uint16 _glyphldArray;
    void _calculate()
    {
        _segCount = _segCountX2 / 2;
        _entrySelector = _segCount < 0 ? 0 : static_cast<uint16_t>(std::floor(std::log2(_segCount)));
        _searchRange = static_cast<uint16_t>(std::pow(2, _entrySelector + 1));
        _rangeShift = _segCountX2 - _searchRange;
        return;
    };

public:
    CmapTable4() : _segCountX2(0), _searchRange(0), _entrySelector(0), _rangeShift(0), _reservedPad(0) {};
    ~CmapTable4() {};
    CmapTable4(reader *rd) : CmapTableBase(rd) { read(rd); };
    void read(reader *rd)
    {
        if (format() != 4)
            return;
        _segCountX2 = rd->readUint16();
        _searchRange = rd->readUint16();
        _entrySelector = rd->readUint16();
        _rangeShift = rd->readUint16();
        _calculate(); // 计算代替读取
        for (auto i = 0; i < _segCount; i++)
        {
            uint16_t code = rd->readUint16();
            _endCode.push_back(code);
        }
        _reservedPad = rd->readUint16();
        for (auto i = 0; i < _segCount; i++)
        {
            uint16_t code = rd->readUint16();
            _startCode.push_back(code);
        }
        for (auto i = 0; i < _segCount; i++)
        {
            int16_t code = rd->readUint16();
            _idDelta.push_back(code);
        }
        for (auto i = 0; i < _segCount; i++)
        {
            uint16_t code = rd->readUint16();
            _idRangeOffset.push_back(code);
        }
        while (rd->curr() < rd->getLength())
        {
            uint16_t glyph = rd->readUint16();
            _glyphldArray.push_back(glyph);
        }
    };
    uint16_t segCountX2() const { return _segCountX2; };
    uint16_t segCount() const { return _segCount; };
    uint16_t searchRange() const { return _searchRange; };
    uint16_t entrySelector() const { return _entrySelector; };
    uint16_t rangeShift() const { return _rangeShift; };
    list_uint16 startCode() const { return _startCode; };
    list_uint16 endCode() const { return _endCode; };
    uint16_t reservePad() const { return _reservedPad; };
    list_int16 idDelta() const { return _idDelta; };
    list_uint16 idRangeOffset() const { return _idRangeOffset; };
    list_uint16 glyphldArray() const { return _glyphldArray; };
    uint16_t glyphId(uint16_t c, int i) const { return *(_idRangeOffset[i] / 2 + (c - _startCode[i]) + &_idRangeOffset[i]); };
    uint16 Format()override{return format();}
};

class CmapTable6 : public CmapTableBase
{
private:
    uint16_t _firstCode;
    uint16_t _entryCount;
    list_uint16 _glyphldArray;

public:
    CmapTable6() : _firstCode(0), _entryCount(0) {};
    ~CmapTable6() {};
    CmapTable6(reader *rd) : CmapTableBase(rd) { read(rd); };
    void read(reader *rd)
    {
        if (format() != 6)
            return;
        _firstCode = rd->readUint16();
        _entryCount = rd->readUint16();
        for (auto i = 0; i < _entryCount; i++)
        {
            uint16_t glyph = rd->readUint16();
            _glyphldArray.push_back(glyph);
        }
    };
    uint16_t firstCode() const { return _firstCode; };
    uint16_t entryCount() const { return _entryCount; };
    list_uint16 glyphldArray() const { return _glyphldArray; };
    uint16 Format()override{return format();}
};

//
class MapGroup
{
private:
    uint32_t _startCharCode;
    uint32_t _endCharCode;
    uint32_t _startGlyphId;

public:
    MapGroup() : _startCharCode(0), _endCharCode(0), _startGlyphId(0) {};
    ~MapGroup() {};
    MapGroup(reader *rd) { read(rd); };
    void read(reader *rd)
    {
        _startCharCode = rd->readUint32();
        _endCharCode = rd->readUint32();
        _startGlyphId = rd->readUint32();
    };
    uint32_t startCharCode() const { return _startCharCode; };
    uint32_t endCharCode() const { return _endCharCode; };
    uint32_t startGlyphId() const { return _startGlyphId; };
};

class CmapTable8 : public CmapTableBase
{
private:
    list_uint8 _is32;
    uint16_t _is32Count;
    uint32_t _numGroups;
    std::vector<MapGroup> _groups;

public:
    CmapTable8() : _is32Count(8192), _numGroups(0) {};
    ~CmapTable8() {};
    CmapTable8(reader *rd) : CmapTableBase(rd) { read(rd); };
    void read(reader *rd)
    {
        if (format() != 8)
            return;
        for (auto i = 0; i < _is32Count; i++)
        {
            uint8_t u = rd->readUint8();
            _is32.push_back(u);
        }
        _numGroups = rd->readUint32();
        for (auto i = 0; i < _numGroups; i++)
        {
            MapGroup mg(rd);
            _groups.push_back(mg);
        }
    };
    list_uint8 is32() const { return _is32; };
    uint16_t numGroups() const { return _numGroups; };
    std::vector<MapGroup> groups() const { return _groups; };
    uint16 Format()override{return format();}
};

//

class CmapTable10 : public CmapTableBase
{
private:
    uint32_t _startCharCode;
    uint32_t _numChars;
    list_uint16 _glyphldArray;

public:
    CmapTable10() : _startCharCode(0), _numChars(0) {};
    ~CmapTable10() {};
    CmapTable10(reader *rd) : CmapTableBase(rd) { read(rd); };
    void read(reader *rd)
    {
        if (format() != 10)
            return;
        _startCharCode = rd->readUint32();
        _numChars = rd->readUint32();
        while (rd->curr() < rd->getLength())
        {
            uint16_t glyph = rd->readUint16();
            _glyphldArray.push_back(glyph);
        }
    };
    uint32_t startCharCode() const { return _startCharCode; };
    uint32_t numChars() const { return _numChars; };
    list_uint16 glyphldArray() const { return _glyphldArray; };
    uint16 Format()override{return format();}
};

//

class CmapTable12 : public CmapTableBase
{
private:
    uint32_t _numGroups;
    std::vector<MapGroup> _groups;

public:
    CmapTable12() : _numGroups(0) {};
    ~CmapTable12() {};
    CmapTable12(reader *rd) : CmapTableBase(rd) { read(rd); };
    void read(reader *rd)
    {
        if (format() != 12)
            return;
        _numGroups = rd->readUint32();
        for (auto i = 0; i < _numGroups; i++)
        {
            MapGroup mg(rd);
            _groups.push_back(mg);
        }
    };
    uint16_t numGroups() const { return _numGroups; };
    std::vector<MapGroup> groups() const { return _groups; };
    uint16 Format()override{return format();}
};

//
class CmapTable13 : public CmapTableBase
{
private:
    uint32_t _numGroups;
    std::vector<MapGroup> _groups;

public:
    CmapTable13() : _numGroups(0) {};
    ~CmapTable13() {};
    CmapTable13(reader *rd) : CmapTableBase(rd) { read(rd); };
    void read(reader *rd)
    {
        if (format() != 13)
            return;
        _numGroups = rd->readUint32();
        for (auto i = 0; i < _numGroups; i++)
        {
            MapGroup mg(rd);
            _groups.push_back(mg);
        }
    };
    uint16_t numGroups() const { return _numGroups; };
    std::vector<MapGroup> groups() const { return _groups; };
    uint16 Format()override{return format();}
};

//

class VariationSelector
{
private:
    uint24 _varSelector; // read 24 bit
    uint16_t _defualtUVSOffset;
    uint16_t _nonDefaultUVSOffset;

public:
    VariationSelector() : _varSelector(0), _defualtUVSOffset(0), _nonDefaultUVSOffset(0) {};
    ~VariationSelector() {};
    VariationSelector(reader *rd) { read(rd); };
    void read(reader *rd)
    {
        _varSelector = rd->readUint24();
        _defualtUVSOffset = rd->readUint16();
        _nonDefaultUVSOffset = rd->readUint16();
    };
    uint32_t varSelector() const { return _varSelector; };
    uint16_t defaultUVSOffset() const { return _defualtUVSOffset; };
    uint16_t nonDefaultUVSOffset() const { return _nonDefaultUVSOffset; };
};

//
class CmapTable14 : public CmapTableBase
{
private:
    uint32_t _numVarSelectorRecords;
    std::vector<VariationSelector> _varSelector;

public:
    CmapTable14() : _numVarSelectorRecords(0) {};
    ~CmapTable14() {};
    CmapTable14(reader *rd) : CmapTableBase(rd) { read(rd); };
    void read(reader *rd)
    {
        if (format() != 14)
            return;
        _numVarSelectorRecords = rd->readUint32();
        for (auto i = 0; i < _numVarSelectorRecords; i++)
        {
            VariationSelector vs(rd);
            _varSelector.push_back(vs);
        }
    };
    uint32_t numVarSelectorRecords() const { return _numVarSelectorRecords; };
    std::vector<VariationSelector> varSelector() const { return _varSelector; };
    uint16 Format()override{return format();}
};

// default uvs table
class UnicodeRange
{
private:
    uint24 _startUnicodeValue;
    uint8_t _additionalCount;

public:
    UnicodeRange() : _startUnicodeValue(0), _additionalCount(0) {};
    ~UnicodeRange() {};
    UnicodeRange(reader *rd) { read(rd); };
    void read(reader *rd)
    {
        _startUnicodeValue = rd->readUint24();
        _additionalCount = rd->readUint8();
    };
    uint32_t startUnicodeValue() const { return _startUnicodeValue; };
    uint8_t additionalCount() const { return _additionalCount; };
};

class DefaultUVS
{
private:
    uint32_t _numUnicodeValueRanges;
    std::vector<UnicodeRange> _ranges;

public:
    DefaultUVS() : _numUnicodeValueRanges(0) {};
    ~DefaultUVS() {};
    DefaultUVS(reader *rd) { read(rd); };
    void read(reader *rd)
    {
        _numUnicodeValueRanges = rd->readInt32();
        for (auto i = 0; i < _numUnicodeValueRanges; i++)
        {
            UnicodeRange ur(rd);
            _ranges.push_back(ur);
        }
    };
    uint32_t numUnicodeValueRanges() const { return _numUnicodeValueRanges; };
    std::vector<UnicodeRange> range() const { return _ranges; };
};

// non-default uvs table
class UVSMapping
{
private:
    uint24 _unicodeValue;
    uint16_t _glyphId;

public:
    UVSMapping() : _unicodeValue(0), _glyphId(0) {};
    ~UVSMapping() {};
    UVSMapping(reader *rd) { read(rd); };
    void read(reader *rd)
    {
        _unicodeValue = rd->readUint24();
        _glyphId = rd->readUint16();
    };
    uint32_t unicodeValue() const { return _unicodeValue; };
    uint16_t glyphId() const { return _glyphId; };
};

class NonDefaultUVS
{
private:
    uint32_t _numUVSMappings;
    std::vector<UVSMapping> _uvsMappings;

public:
    NonDefaultUVS() : _numUVSMappings(0) {};
    ~NonDefaultUVS() {};
    NonDefaultUVS(reader *rd) { read(rd); };
    void read(reader *rd)
    {
        _numUVSMappings = rd->readUint32();
        for (auto i = 0; i < _numUVSMappings; i++)
        {
            UVSMapping um(rd);
            _uvsMappings.push_back(um);
        }
    };
    uint32_t numUVSMappings() const { return _numUVSMappings; };
    std::vector<UVSMapping> uvsMappings() const { return _uvsMappings; };
};

#endif