[Devel] Dropouts in AA text

[Keith Packard]

Using 'timesi.ttf' (Times New Roman from Microsoft's webfonts page), I'm
losing the diagonal element in the lowercase 'z' at sizes from about 8
pixels up to about 22 pixels.  At larger sizes, the diagonal is vaguely
visible, at smaller sizes the vertices are not snapped to a grid and the 
diagonal looks correct.

When rasterized to a monochrome bitmap, the diagonal is visible down to 
sizes around 9 pixels; after that it's just a mash of pixels.

        http://keithp.com/~keithp/download/dropouts.png

shows the problem.  Note that the displayed numbers are point sizes, my
monitor is 86dpi making the pixel sizes 1.2 times the point sizes.

Off to anti-alias twm...

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