Docs » Autodocs » graphics.library » SetMaxPen
SetMaxPen -- set maximum pen value for a rastport (V39).
SetMaxPen ( rp, maxpen)
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void SetMaxPen(struct RastPort *,ULONG)
This will instruct the graphics library that the owner of the rastport
will not be rendering in any colors whose index is >maxpen. If there
are any speed optimizations which the graphics device can make based
on this fact (for instance, setting the pixel write mask), they will
be done.
Basically this call sets the rastport mask, if this would improve
speed. On devices where masking would slow things down (like with
chunky pixels), it will be a no-op.
rp = a pointer to a valid RastPort structure.
maxpen = a longword pen value.
The maximum pen value passed must take into account not only which
colors you intend to render in the future, but what colors you will
be rendering on top of.
SetMaxPen(rp,0) doesn't make much sense.
SetWriteMask()
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