(re-sent due to odd fdo bounces) Hey Luboš, Luboš Luňák wrote:
Is this some kind of a strange rule that I'm not aware of? Does somebody know a good reason why all graphics libraries would do this?
Yes, essentially all graphics systems fill polygons like that (including 3D ones). The reason is that otherwise you cannot render pixel-perfect adjacent polygons without occasional overlap (especially for non-straight connecting lines). So really drawRect() is the odd one out, as Caolan suggested. ...and now you know why the code is so littered with this +1/-1 corrections for rectangles. The (now gone) software renderer in basebmp had some comments about those subtleties, and some explicit adjustments in the svp backend layer above. Cheers, -- Thorsten
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