<Swing Dev> [9] Review request for 8058742: Text size is twice bigger under GTK L&F on Gnome with HiDPI enabled

[Sergey Bylokhov]

On 25.07.16 20:56, Semyon Sadetsky wrote:
> But the font doesn't need to be scaled if JDK supports scale already.
> Before the scale support is added to JDK the native scale was supported
> for GTK LnF only and using fonts size only. I kept this simplified scale
> support for compatibility with Linux OSes for which native scale is not
> supported. For Qt based WMs for example.

The question was why the native scale is taken into account, but debug 
scale not. In this case we will get a different results if the native 
scale=2 was read from J2D_UISCALE/scale-factor/GDK_SCALE/Xft.dpi or was 
set for debugging by the user.

I think the logic should be:
  - Take debug scale into account if it was set and skip all others.
  - Check J2D_UISCALE
  - Check scale-factor, text-scale-factor, text-scaling-factor.
  - Check Xft.dpi.
  - If non of them was set then scale=1 should be used.

I guess text-scale-factor, text-scaling-factor are text related scales, 
but we use it as a generic one, so why Xft.dpi should be different?

-- 
Best regards, Sergey.