Yeah, shifting pixel columns up and down only works well with fatter fonts. With fonts that have pixel-wide strokes, it gets kind of ugly. Like, on C64 demos I remember, the fonts for the wavy greets were usually about 12 or 16 pixels tall with double-width strokes.
I guess if the dy from one column to the next is never more than 1 pixel it ought to be reasonably okay.
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