On Mon, Aug 31, 2015 at 12:24 PM, Nikolaus Waxweiler <madig...@gmail.com> wrote:
>
> Frankly, I'm not pleased with the results,
> especially below 10 or 11ppem, where glyphs degenerate into a hazy mess

FT_Outline_EmboldenXY will not work well at very small sizes when
emboldening amount may exceed the stem width. In fact I would try that
as a limit:

darkenAmount = darkenAmount > stemWidth ? stemWidth : darkenAmount;

To be more precise, it is not so much about stem width but about
"characteristic feature size" or some characteristic distance between
outline points. If you embolden much more than that, artifacts will be
awesome.

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