PdfFontMetricsFreetype.h

// SPDX-FileCopyrightText: 2005 Dominik Seichter <domseichter@web.de>
// SPDX-FileCopyrightText: 2020 Francesco Pretto <ceztko@gmail.com>
// SPDX-License-Identifier: LGPL-2.0-or-later OR MPL-2.0
 
#ifndef PDF_FONT_METRICS_FREETYPE_H
#define PDF_FONT_METRICS_FREETYPE_H
 
#include "PdfDeclarations.h"
 
#include "PdfFontMetrics.h"
#include "PdfString.h"
 
namespace PoDoFo {
 
struct PdfEncodingLimits;
 
class PODOFO_API PdfFontMetricsFreetype final : public PdfFontMetrics
{
    friend class PdfFontMetrics;
 
public:
    ~PdfFontMetricsFreetype();
 
    std::unique_ptr<PdfCMapEncoding> CreateToUnicodeMap(const PdfEncodingLimits& limitHints) const override;
 
    bool HasUnicodeMapping() const override;
 
    bool TryGetGID(char32_t codePoint, unsigned& gid) const override;
 
    double GetDefaultWidthRaw() const override;
 
    double GetLineSpacing() const override;
 
    double GetUnderlineThickness() const override;
 
    double GetUnderlinePosition() const override;
 
    double GetStrikeThroughPosition() const override;
 
    double GetStrikeThroughThickness() const override;
 
    std::string_view GetFontName() const override;
 
    std::string_view GetFontFamilyName() const override;
 
    unsigned char GetSubsetPrefixLength() const override;
 
    PdfFontStretch GetFontStretch() const override;
 
    bool TryGetFlags(PdfFontDescriptorFlags& value) const override;
 
    bool TryGetBoundingBox(Corners& value) const override;
 
    bool TryGetItalicAngle(double& value) const override;
 
    bool TryGetAscent(double& value) const override;
 
    bool TryGetDescent(double& value) const override;
 
    bool TryGetCapHeight(double& value) const override;
 
    bool TryGetStemV(double& value) const override;
 
    double GetLeadingRaw() const override;
 
    int GetWeightRaw() const override;
 
    double GetXHeightRaw() const override;
 
    double GetStemHRaw() const override;
 
    double GetAvgWidthRaw() const override;
 
    double GetMaxWidthRaw() const override;
 
    PdfFontFileType GetFontFileType() const override;
 
    unsigned GetFontFileLength1() const override;
 
    unsigned GetFontFileLength2() const override;
 
    unsigned GetFontFileLength3() const override;
 
    const datahandle& GetFontFileDataHandle() const override;
 
#ifdef PODOFO_3RDPARTY_INTEROP_ENABLED
    FT_Face GetFaceHandle() const override;
#endif // #ifdef PODOFO_3RDPARTY_INTEROP_ENABLED
 
protected:
    std::string_view GetBaseFontName() const override;
 
    unsigned GetGlyphCountFontProgram() const override;
 
    bool TryGetGlyphWidthFontProgram(unsigned gid, double& width) const override;
 
    bool getIsBoldHint() const override;
 
    bool getIsItalicHint() const override;
 
private:
    PdfFontMetricsFreetype(FT_Face face, const datahandle& data, const PdfFontMetrics* refMetrics = nullptr);
 
    void init(const PdfFontMetrics* refMetrics);
 
    void ensureLengthsReady();
 
    void initType1Lengths(const bufferview& view);
 
    bool tryBuildFallbackUnicodeMap();
 
private:
    FT_Face m_Face;
    datahandle m_Data;
    PdfFontFileType m_FontFileType;
 
    unsigned char m_SubsetPrefixLength;
    bool m_HasUnicodeMapping;
    std::unique_ptr<std::unordered_map<uint32_t, unsigned>> m_fallbackUnicodeMap;
 
    std::string m_FontBaseName;
    std::string m_FontName;
    std::string m_FontFamilyName;
 
    // Conditionally required metrics
    PdfFontDescriptorFlags m_Flags;
    Corners m_BBox;
    double m_ItalicAngle;
    double m_Ascent;
    double m_Descent;
    double m_CapHeight;
    double m_StemV;
 
    // Optional metrics
    PdfFontStretch m_FontStretch;
    int m_Weight;
    double m_Leading;
    double m_XHeight;
    double m_StemH;
    double m_AvgWidth;
    double m_MaxWidth;
    double m_DefaultWidth;
 
    // Computed metrics
    double m_LineSpacing;
    double m_UnderlineThickness;
    double m_UnderlinePosition;
    double m_StrikeThroughThickness;
    double m_StrikeThroughPosition;
 
    bool m_LengthsReady;
    unsigned m_Length1;
    unsigned m_Length2;
    unsigned m_Length3;
};
 
};
 
#endif // PDF_FONT_METRICS_FREETYPE_H