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A display driver or display hardware can clip if it can discard output that
would be outside of a specified rectangle or region if drawn on the screen.
GDI checks the dpClip member in the GDIINFO structure to determine whether
the display driver can clip output generated by the Output function. If a
display driver can clip, it should set the bits in this member to specify
clipping for rectangles or regions. If the display driver does not support
clipping, GDI will simulate clipping.
 
Although dpClip only applies to output generated by the driver's Output
function, other members in the GDIINFO structure specify clipping for other
graphics output. For example, the dpText member specifies whether the
display driver clips text.
 
 
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