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Re: Status of the test framework project
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From: |
Alexei Podtelezhnikov |
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Subject: |
Re: Status of the test framework project |
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Date: |
Mon, 11 Jan 2021 18:38:10 -0500 |
> > Most likely FreeType already has a collection of fonts for testing,
> > but I cannot find any references.
>
> Alas, it has not. The test font corpus used for fuzzing is not really
> suited for testing the rendering, and collecting commercial fonts is
> problematic...
We do not need much to test the rendering itself. The test patterns in
ftstring (ft2-demos) with a bunch of tight curves are very sensitive
to any errors in the algorithm including insufficient flattening.
There are expected to be one-off or two-off differences because of
rounding: the 64-bit solutions might differ from the 32-bit once. Any
issues with auto hinting also do not need much to show up in blinkl
tests: just a few glyphs with slightly curvy stems. To test native
hinting, you might need considerably more:
https://en.wikipedia.org/wiki/Core_fonts_for_the_Web.
A.