[Gtk-sharp-list] Cairo Scaling Is Blurry

[frychiko]

This has been driving me nuts. I can't find any way to scale images without
blurring in Cairo, at least ways without side effects.

A simple x2 scale:

g.Scale (2, 2);
g.SetSourceImage (source, 0, 0);
g.Rectangle (0, 0, 100, 100);
g.Fill ();

Is using some kind of filtering and we've got no control over the pattern /
source's filtering. If we instead do it all manually:

g.Scale (2, 2);
pattern = new SurfacePattern (source);
pattern.Filter = Filter.Nearest;
pattern.Extend = Extend.None;
g.Pattern = pattern;
g.Rectangle (0, 0, 100, 100);
g.Fill ();

This works, but the source won't show outside of a 100, 100 location.
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