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GetBPen -- Get the B Pen value for a RastPort (V39).
pen = GetBPen ( rp )
d0 a0
ULONG GetBPen(struct RastPort *)
Return the current value of the B pen for the rastport. This function
should be used instead of peeking the structure directly, because future
graphics devices may store it differently, using more bits.
rp = a pointer to a valid RastPort structure.
SetBPen(), <graphics/gfx.h>
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