*is* not able :-(
At least not in the way it is used by TxText.

We use a fallback solution for simple text drawings on an AthensCanvas with a StrikeFont,
(we do not really use the font in the image, but use cairos ("toy")-text-drawing api).

But the TxTextModel depends on details in the font metric and per-character glyph drawing.

And this is not yet possible with non-FT fonts.

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