Cool! FYI, your formula for enclosingIntRect is wrong. Consider, e.g., x=0.4 and width=0.7.
Also, in pixelSnappedIntRect, you need to ensure that your rounding function doesn't round towards (or away from) 0. See http://robert.ocallahan.org/2008/02/rounding-towards-or-away-from-zero_12.html. In particular libc round() does not do the right thing. (I didn't look at your code so maybe you already discovered this :-).) Rob -- "If we claim to be without sin, we deceive ourselves and the truth is not in us. If we confess our sins, he is faithful and just and will forgive us our sins and purify us from all unrighteousness. If we claim we have not sinned, we make him out to be a liar and his word is not in us." [1 John 1:8-10]
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