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drawing text

I'm porting an editor from Gold-Hill CL to CLIM 1.0 on MCL 2.0 (both beta).
When drawing in Gold Hill (MS-Windows) text can overwrite other text, instead
of combining with it. How can I specify a boolean function over destination
and source pixels or getting the same effect, in CLIM? I read about
compose-in and -out but didn't understand it well enough to be able to use

If I get the help I need I may release it for public please help.

Hallvard Traetteberg
Dept. of Knowledge Based Systems
Center for Industrial Research
Box 124 Blindern, 0314 Oslo 3

Tlf: +47 2 45 20 10
Fax: +47 2 45 20 40


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