RFR: 8211294: [windows] TextArea content is blurry with 125% scaling

[Kevin Rushforth]

On Wed, 21 Oct 2020 07:01:46 GMT, Frederic Thevenet <fthevenet at openjdk.org> wrote:

>>> 
>>> 
>>> The visual representation corresponds with digits, so there can be tests that check if the numbers are what we expect them to be.
>>> It's good that this is not windows-only, so that it can be tackled on linux as well. But what is not clear to me: does this require a physical HiDPI screen, or is setting the scale factor manually good enough to reproduce the bug?
>> 
>> The issue will appear consistently as long as the conditions I listed are met, regardless of the actual number of pixels the physical screen can display.
>> For instance you'll see the problem, if you apply a 125% scaling on 1080p screen (a common configuration on 13'' laptops).
>> Also, it will occur regardless of whether the scaling is applied at the OS level and picked up by javafx or if it is only set for a single application using the `glass.xxx.uiScale` property.
>
> Hello,
> Did anyone get a chance to look into this?
> Thanks!

Not yet. I took a quick look, and this is helpful in pointing out where the problem is, but I don't know whether it is the right solution to simply round the transform values when rendering the cache to the screen.

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PR: https://git.openjdk.java.net/jfx/pull/308