RFR: JDK-8328750: [TestBug] Improve Stub Font Support

[Andy Goryachev]

On Tue, 26 Mar 2024 20:25:07 GMT, Marius Hanl <mhanl at openjdk.org> wrote:

>> I am not sure why this is needed here, so my concern stems from the fact that `ceil()` might introduce a large bias (0.000001 -> 1.0), and `rnd()` _seems_ to be a better choice.
>> 
>> But then again, ceil() or rnd() might be a wrong thing to do if we are dealing with scaled coordinates and we don't expect the whole integers, but instead are dealing with small differences between expected and obtained values (in which case a better comparison is required).
>
> I can also use `round` here. Seems to be a bit safer, I agree.

thank you.

one more question - is it possible to set fractional scale with the StubToolkit, and how would that work in the StubFontLoader?  Does it mean we'll be rounding the scaled values?

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PR Review Comment: https://git.openjdk.org/jfx/pull/1422#discussion_r1540073971