fontsubset.hxx

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
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#ifndef INCLUDED_VCL_INC_FONTSUBSET_HXX
#define INCLUDED_VCL_INC_FONTSUBSET_HXX

#include <rtl/ustring.hxx>
#include <tools/gen.hxx>
#include <o3tl/typed_flags_set.hxx>

#include <vcl/dllapi.h>
#include <vcl/glyphitem.hxx>

namespace vcl { class TrueTypeFont; } 

enum class FontType {
    NO_FONT     = 0,
    SFNT_TTF    = 1<<1,                     
    SFNT_CFF    = 1<<2,                     
    TYPE1_PFA   = 1<<3,                     
    TYPE1_PFB   = 1<<4,                     
    CFF_FONT    = 1<<5,                     
    TYPE3_FONT  = 1<<6,                     
    TYPE42_FONT = 1<<7,                     
    ANY_SFNT    = SFNT_TTF | SFNT_CFF,
    ANY_TYPE1   = TYPE1_PFA | TYPE1_PFB
};
namespace o3tl {
    template<> struct typed_flags<FontType> : is_typed_flags<FontType, (1<<8)-1> {};
}

class VCL_DLLPUBLIC FontSubsetInfo final
{
public:
    explicit    FontSubsetInfo();
                ~FontSubsetInfo();

    void        LoadFont( FontType eInFontType,
                    const unsigned char* pFontBytes, int nByteLength );
    void        LoadFont( vcl::TrueTypeFont* pSftTrueTypeFont );

    bool        CreateFontSubset( FontType nOutFontTypeMask,
                    FILE* pOutFile, const char* pOutFontName,
                    const sal_GlyphId* pGlyphIds, const sal_uInt8* pEncodedIds,
                    int nReqGlyphCount, sal_Int32* pOutGlyphWidths = nullptr );

public: // TODO: make subsetter results private and provide accessor methods instead
        // subsetter-provided subset details needed by e.g. Postscript or PDF
    OUString                m_aPSName;
    int                     m_nAscent;          
    int                     m_nDescent;
    int                     m_nCapHeight;
    tools::Rectangle               m_aFontBBox;
    FontType                m_nFontType;        

private:
    // input-font-specific details
    unsigned const char*    mpInFontBytes;
    int                     mnInByteLength;
    FontType                meInFontType;       
    vcl::TrueTypeFont*      mpSftTTFont;

    // subset-request details
    FontType                mnReqFontTypeMask;  
    FILE*                   mpOutFile;
    const char*             mpReqFontName;
    const sal_GlyphId*      mpReqGlyphIds;
    const sal_uInt8*        mpReqEncodedIds;
    int                     mnReqGlyphCount;

    bool    CreateFontSubsetFromCff( sal_Int32* pOutGlyphWidths );
    bool    CreateFontSubsetFromSfnt( sal_Int32* pOutGlyphWidths );
    static bool CreateFontSubsetFromType1( const sal_Int32* pOutGlyphWidths );
};

#endif // INCLUDED_VCL_INC_FONTSUBSET_HXX

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