Viewport to pixel mapping?

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Mario Veraart (rioj7++at++fel.tno.nl)
Thu, 18 Dec 1997 17:26:45 +0100 (MET)

Hello,

I would like to know how the exact mapping from viewport coordinates
of a channel to pixels is done.
More in detail: are the viewport coodinates mapped to pixel centres or
inbetween pixels?

Mario
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