fntcache.hxx

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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 *   Licensed to the Apache Software Foundation (ASF) under one or more
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#ifndef INCLUDED_SW_SOURCE_CORE_INC_FNTCACHE_HXX
#define INCLUDED_SW_SOURCE_CORE_INC_FNTCACHE_HXX

#include <sal/config.h>

#include <cstdint>
#include <unordered_map>

#include <vcl/font.hxx>
#include <vcl/vclptr.hxx>
#include <vcl/vcllayout.hxx>
#include <vcl/outdev.hxx>
#include "swcache.hxx"
#include "TextFrameIndex.hxx"

class FontMetric;
class SwFntObj;
class SwDrawTextInfo;
class SwViewShell;
class SwSubFont;
class MapMode;

class SwFntCache : public SwCache
{
public:
    SwFntCache() : SwCache(50
#ifdef DBG_UTIL
    , OString(RTL_CONSTASCII_STRINGPARAM("Global Font-Cache pFntCache"))
#endif
    ) {}

    inline SwFntObj *First( );
    static inline SwFntObj *Next( SwFntObj *pFntObj);
    void Flush();
};

void SwClearFntCacheTextGlyphs();

// Font cache, global variable, created/destroyed in txtinit.cxx
extern SwFntCache *pFntCache;
extern SwFntObj *pLastFont;

struct SwTextGlyphsKey
{
    VclPtr<OutputDevice> m_pOutputDevice;
    OUString m_aText;
    sal_Int32 m_nIndex;
    sal_Int32 m_nLength;
    size_t mnHashCode;

    SwTextGlyphsKey(VclPtr<OutputDevice> const& pOutputDevice, const OUString & sText, sal_Int32 nIndex, sal_Int32 nLength);
    bool operator==(SwTextGlyphsKey const & rhs) const;
};
struct SwTextGlyphsKeyHash
{
    size_t operator()(SwTextGlyphsKey const & rKey) const { return rKey.mnHashCode; }
};
struct SwTextGlyphsData
{
    SalLayoutGlyphs m_aTextGlyphs;
    tools::Long m_nTextWidth = -1; // -1 = not computed yet
};
typedef std::unordered_map<SwTextGlyphsKey, SwTextGlyphsData, SwTextGlyphsKeyHash> SwTextGlyphsMap;

class SwFntObj final : public SwCacheObj
{
    friend class SwFntAccess;
    friend void InitCore();
    friend void FinitCore();

    vcl::Font m_aFont;
    vcl::Font *m_pScrFont;
    vcl::Font *m_pPrtFont;
    VclPtr<OutputDevice> m_pPrinter;
    sal_uInt16 m_nGuessedLeading;
    sal_uInt16 m_nExtLeading;
    sal_uInt16 m_nScrAscent;
    sal_uInt16 m_nPrtAscent;
    sal_uInt16 m_nScrHeight;
    sal_uInt16 m_nPrtHeight;
    sal_uInt16 m_nPropWidth;
    sal_uInt16 m_nZoom;
    bool m_bSymbol : 1;
    bool m_bPaintBlank : 1;

    SwTextGlyphsMap m_aTextGlyphs;

    static tools::Long s_nPixWidth;
    static MapMode *s_pPixMap;

public:
    SwFntObj( const SwSubFont &rFont, std::uintptr_t nFontCacheId,
              SwViewShell const *pSh );

    virtual ~SwFntObj() override;

    vcl::Font *GetScrFont()     { return m_pScrFont; }
    vcl::Font& GetFont()        { return m_aFont; }
    const vcl::Font& GetFont() const  { return m_aFont; }

    sal_uInt16 GetGuessedLeading() const  { return m_nGuessedLeading; }
    sal_uInt16 GetExternalLeading() const  { return m_nExtLeading; }

    sal_uInt16 GetFontAscent( const SwViewShell *pSh, const OutputDevice& rOut );
    sal_uInt16 GetFontHeight( const SwViewShell *pSh, const OutputDevice& rOut );
    sal_uInt16 GetFontLeading( const SwViewShell *pSh, const OutputDevice& rOut );

    void GuessLeading( const SwViewShell& rSh, const FontMetric& rMet );

    void SetDevFont( const SwViewShell *pSh, OutputDevice& rOut );
    OutputDevice* GetPrt() const { return m_pPrinter; }
    sal_uInt16   GetZoom() const { return m_nZoom; }
    sal_uInt16   GetPropWidth() const { return m_nPropWidth; }
    bool     IsSymbol() const { return m_bSymbol; }

    tools::Long GetCachedTextWidth(const SwTextGlyphsKey& key, const vcl::text::TextLayoutCache* vclCache);
    SalLayoutGlyphs* GetCachedSalLayoutGlyphs(const SwTextGlyphsKey& key);
    void ClearCachedTextGlyphs();

    void   DrawText( SwDrawTextInfo &rInf );
    Size  GetTextSize( SwDrawTextInfo &rInf );
    TextFrameIndex GetModelPositionForViewPoint(SwDrawTextInfo &rInf);

    void CreateScrFont( const SwViewShell& rSh, const OutputDevice& rOut );
    void CreatePrtFont( const OutputDevice& rOut );
};

SwFntObj *SwFntCache::First( )
{
    return static_cast<SwFntObj *>(SwCache::First());
}

SwFntObj *SwFntCache::Next( SwFntObj *pFntObj)
{
    return static_cast<SwFntObj *>(SwCache::Next( pFntObj ));
}

class SwFntAccess final : public SwCacheAccess
{
    SwViewShell const *m_pShell;

    virtual SwCacheObj *NewObj( ) override;

public:
    SwFntAccess( const void*& rnFontCacheId, sal_uInt16 &rIndex, const void *pOwner,
                 SwViewShell const *pShell,
                 bool bCheck = false  );
    SwFntObj* Get() { return static_cast<SwFntObj*>( SwCacheAccess::Get() ); }
};

#endif

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