Docs » Autodocs » graphics.library » SetWriteMask
SetWriteMask -- Set the pixel write mask value for a RastPort (V39).
success=SetWriteMask ( rp, msk )
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ULONG SetWriteMask(struct RastPort *,ULONG)
Set the current value of the bit write mask for the rastport.
bits of the pixel with zeros in their mask will not be modified by
subsequent drawing operations.
rp = a pointer to a valid RastPort structure.
msk = a longword mask value.
Graphics devices which do not support per-bit masking will
return 0 (failure).
<graphics/gfxmacros.h>
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