googlefonts / googlefonts/fontmake
TTF interpolation defects
- Dominant language
- Python
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Description
Hello!
I am building a variable font for rendering waveforms, https://audio-lab.github.io/wavefont/, and observing an issue with interpolating TTF state.
Font has alignment axis, and masters define top-align and bottom-align state, with values of `algn` _1_ and _0_ respectively, see [descignspace file](https://github.com/audio-lab/wavefont/blob/master/masters/wavefont.designspace#L11). Center align state (`algn` _0.5_) is expected to be interpolated by font.
And it is interpolated nicely by OTF font, generated with afdk:
But with TTF font, generated by fontmake, interpolation shows artifacts:
As if top part of bars have right edge lowered by 1px.
What can that be related to? Some rounding to int?
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