alpha.hxx

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#ifndef INCLUDED_VCL_ALPHA_HXX
#define INCLUDED_VCL_ALPHA_HXX

#include <sal/config.h>

#include <utility>

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

class BitmapEx;

class VCL_DLLPUBLIC AlphaMask final : public Bitmap
{
public:

                AlphaMask();
    explicit    AlphaMask( const Bitmap& rBitmap );
                AlphaMask( const AlphaMask& rAlphaMask );
                AlphaMask( AlphaMask&& rAlphaMask );
    explicit    AlphaMask( const Size& rSizePixel, const sal_uInt8* pEraseTransparency = nullptr );
    virtual     ~AlphaMask() override;

    AlphaMask&  operator=( const Bitmap& rBitmap );
    AlphaMask&  operator=( const AlphaMask& rAlphaMask ) { return static_cast<AlphaMask&>( Bitmap::operator=( rAlphaMask ) ); }
    AlphaMask&  operator=( AlphaMask&& rAlphaMask ) noexcept { return static_cast<AlphaMask&>( Bitmap::operator=( std::move(rAlphaMask) ) ); }
    bool        operator==( const AlphaMask& rAlphaMask ) const { return Bitmap::operator==(rAlphaMask); }
    bool        operator!=( const AlphaMask& rAlphaMask ) const { return Bitmap::operator!=(rAlphaMask); }

    Bitmap const & GetBitmap() const;

    void        Erase( sal_uInt8 cTransparency );
    void        BlendWith(const Bitmap& rOther);

    BitmapReadAccess*  AcquireAlphaReadAccess() { return Bitmap::AcquireReadAccess(); }
    BitmapWriteAccess* AcquireAlphaWriteAccess() { return Bitmap::AcquireWriteAccess(); }

    void        ReleaseAccess( BitmapReadAccess* pAccess );

    typedef vcl::ScopedBitmapAccess<BitmapReadAccess, AlphaMask, &AlphaMask::AcquireAlphaReadAccess> ScopedReadAccess;

    using Bitmap::IsEmpty;

private:
    friend class BitmapEx;
    friend class ::OutputDevice;
    friend bool VCL_DLLPUBLIC ReadDIBBitmapEx(BitmapEx& rTarget, SvStream& rIStm, bool bFileHeader, bool bMSOFormat);

    SAL_DLLPRIVATE const Bitmap&    ImplGetBitmap() const;
    SAL_DLLPRIVATE void             ImplSetBitmap( const Bitmap& rBitmap );

};

#endif // INCLUDED_VCL_ALPHA_HXX

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