sallayout.hxx

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#ifndef INCLUDED_VCL_INC_SALLAYOUT_HXX
#define INCLUDED_VCL_INC_SALLAYOUT_HXX
 
#include <sal/config.h>
 
#include <basegfx/point/b2dpoint.hxx>
#include <basegfx/polygon/b2dpolypolygon.hxx>
#include <tools/gen.hxx>
#include <tools/degree.hxx>
#include <i18nlangtag/languagetag.hxx>
 
#include <vcl/dllapi.h>
#include <vcl/vclenum.hxx> // for typedef sal_UCS4
#include <vcl/vcllayout.hxx>
 
#include "ImplLayoutRuns.hxx"
#include "impglyphitem.hxx"
 
#include <com/sun/star/i18n/XBreakIterator.hpp>
 
#include <hb.h>
 
#include <iostream>
#include <memory>
#include <vector>
 
#define MAX_FALLBACK 16
 
class GenericSalLayout;
class SalGraphics;
enum class SalLayoutFlags;
 
namespace vcl::font {
    class PhysicalFontFace;
}
 
namespace vcl::text {
    class TextLayoutCache;
}
 
class MultiSalLayout final : public SalLayout
{
public:
    void            DrawText(SalGraphics&) const override;
    sal_Int32       GetTextBreak(double nMaxWidth, double nCharExtra, int nFactor) const override;
    double          GetTextWidth() const final override;
    double          FillDXArray(std::vector<double>* pDXArray, const OUString& rStr) const override;
    void            GetCaretPositions(std::vector<double>& rCaretPositions, const OUString& rStr) const override;
    bool            GetNextGlyph(const GlyphItem** pGlyph, basegfx::B2DPoint& rPos, int& nStart,
                                 const LogicalFontInstance** ppGlyphFont = nullptr) const override;
    bool            GetOutline(basegfx::B2DPolyPolygonVector&) const override;
    bool            IsKashidaPosValid(int nCharPos, int nNextCharPos) const override;
    SalLayoutGlyphs GetGlyphs() const final override;
 
    // used only by OutputDevice::ImplLayout, TODO: make friend
    explicit        MultiSalLayout( std::unique_ptr<SalLayout> pBaseLayout );
    void            AddFallback(std::unique_ptr<SalLayout> pFallbackLayout, ImplLayoutRuns const &);
    // give up ownership of the initial pBaseLayout taken by the ctor
    std::unique_ptr<SalLayout>  ReleaseBaseLayout();
    bool            LayoutText(vcl::text::ImplLayoutArgs&, const SalLayoutGlyphsImpl*) override;
    void            AdjustLayout(vcl::text::ImplLayoutArgs&) override;
    void            InitFont() const override;
 
    void SetIncomplete(bool bIncomplete);
 
    void            ImplAdjustMultiLayout(vcl::text::ImplLayoutArgs& rArgs,
                                          vcl::text::ImplLayoutArgs& rMultiArgs,
                                          const double* pMultiDXArray);
 
    virtual         ~MultiSalLayout() override;
 
private:
                    MultiSalLayout( const MultiSalLayout& ) = delete;
                    MultiSalLayout& operator=( const MultiSalLayout& ) = delete;
 
    std::unique_ptr<GenericSalLayout> mpLayouts[ MAX_FALLBACK ];
    ImplLayoutRuns  maFallbackRuns[ MAX_FALLBACK ];
    int             mnLevel;
    bool            mbIncomplete;
};
 
class VCL_DLLPUBLIC GenericSalLayout : public SalLayout
{
    friend void MultiSalLayout::ImplAdjustMultiLayout(
            vcl::text::ImplLayoutArgs& rArgs,
            vcl::text::ImplLayoutArgs& rMultiArgs,
            const double* pMultiDXArray);
 
public:
                    GenericSalLayout(LogicalFontInstance&);
                    ~GenericSalLayout() override;
 
    void            AdjustLayout(vcl::text::ImplLayoutArgs&) final override;
    bool            LayoutText(vcl::text::ImplLayoutArgs&, const SalLayoutGlyphsImpl*) final override;
    void            DrawText(SalGraphics&) const final override;
    SalLayoutGlyphs GetGlyphs() const final override;
 
    bool            IsKashidaPosValid(int nCharPos, int nNextCharPos) const final override;
 
    // used by upper layers
    double          GetTextWidth() const final override;
    double          FillDXArray(std::vector<double>* pDXArray, const OUString& rStr) const final override;
    sal_Int32       GetTextBreak(double nMaxWidth, double nCharExtra, int nFactor) const final override;
    void            GetCaretPositions(std::vector<double>& rCaretPositions, const OUString& rStr) const override;
 
    // used by display layers
    LogicalFontInstance& GetFont() const
        { return *m_GlyphItems.GetFont(); }
 
    bool            GetNextGlyph(const GlyphItem** pGlyph, basegfx::B2DPoint& rPos, int& nStart,
                                 const LogicalFontInstance** ppGlyphFont = nullptr) const override;
 
    const SalLayoutGlyphsImpl& GlyphsImpl() const { return m_GlyphItems; }
 
private:
    // for glyph+font+script fallback
    void            MoveGlyph(int nStart, double nNewXPos);
    void            DropGlyph(int nStart);
    void            Simplify(bool bIsBase);
 
                    GenericSalLayout( const GenericSalLayout& ) = delete;
                    GenericSalLayout& operator=( const GenericSalLayout& ) = delete;
 
    void            ApplyDXArray(const double*, const sal_Bool*);
    void            Justify(double nNewWidth);
    void            ApplyAsianKerning(std::u16string_view rStr);
 
    void            GetCharWidths(std::vector<double>& rCharWidths,
                                  const OUString& rStr) const;
 
    void            SetNeedFallback(vcl::text::ImplLayoutArgs&, sal_Int32, bool);
 
    bool            HasVerticalAlternate(sal_UCS4 aChar, sal_UCS4 aNextChar);
 
    void            ParseFeatures(std::u16string_view name);
 
    css::uno::Reference<css::i18n::XBreakIterator> mxBreak;
 
    SalLayoutGlyphsImpl m_GlyphItems;
 
    OString         msLanguage;
    std::vector<hb_feature_t> maFeatures;
 
    hb_set_t*       mpVertGlyphs;
    const bool      mbFuzzing;
};
 
#endif // INCLUDED_VCL_INC_SALLAYOUT_HXX
 
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