scoped_gdi.hxx

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#ifndef INCLUDED_VCL_INC_WIN_SCOPED_GDI_HXX
#define INCLUDED_VCL_INC_WIN_SCOPED_GDI_HXX

#include <win/svsys.h>
#include <win/wincomp.hxx>
#include <win/saldata.hxx>

#include <memory>

template <typename H, auto DeleterFunc> struct GDIDeleter
{
    using pointer = H;
    void operator()(H h) { DeleterFunc(h); }
};

template <typename H, auto DeleterFunc>
using ScopedGDI = std::unique_ptr<H, GDIDeleter<H, DeleterFunc>>;

using ScopedHBRUSH = ScopedGDI<HBRUSH, DeleteBrush>;
using ScopedHRGN = ScopedGDI<HRGN, DeleteRegion>;
using ScopedHDC = ScopedGDI<HDC, DeleteDC>;
using ScopedHPEN = ScopedGDI<HPEN, DeletePen>;
using ScopedHFONT = ScopedGDI<HFONT, DeleteFont>;
using ScopedHBITMAP = ScopedGDI<HBITMAP, DeleteBitmap>;

template <typename ScopedH, auto SelectorFunc> class ScopedSelectedGDI
{
public:
    ScopedSelectedGDI(HDC hDC, typename ScopedH::pointer h)
        : m_hDC(hDC)
        , m_hSelectedH(h)
        , m_hOrigH(SelectorFunc(hDC, h))
    {
    }

    ~ScopedSelectedGDI() { SelectorFunc(m_hDC, m_hOrigH); }

private:
    HDC m_hDC;
    ScopedH m_hSelectedH;
    typename ScopedH::pointer m_hOrigH;
};

using ScopedSelectedHPEN = ScopedSelectedGDI<ScopedHPEN, SelectPen>;
using ScopedSelectedHFONT = ScopedSelectedGDI<ScopedHFONT, SelectFont>;
using ScopedSelectedHBRUSH = ScopedSelectedGDI<ScopedHBRUSH, SelectBrush>;

template <sal_uLong ID> class ScopedCachedHDC
{
public:
    explicit ScopedCachedHDC(HBITMAP hBitmap)
        : m_hDC(ImplGetCachedDC(ID, hBitmap))
    {
    }

    ~ScopedCachedHDC() { ImplReleaseCachedDC(ID); }

    HDC get() const { return m_hDC; }

private:
    HDC m_hDC;
};

#endif // INCLUDED_VCL_INC_WIN_SCOPED_GDI_HXX

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