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

[Sergey Bylokhov]

On 26.07.16 13:32, Semyon Sadetsky wrote:
>> 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 have answered you already the GTK font size will be unexpectedly small
> if divided on debug scale.

Debug scale should always be taken into account, if the text will be 
small in this case then Xft.dpi should be ignored as I described below. 
We should use only one property at a time.

>> 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.
> Did you try to use scale from Xft.dpi? Its value is not a scale usually.

What is the difference between text-scale-factor and Xft.dpi? Both of 
them text related. But one of them is used as a general/default scale of 
GC and another one affects the text only.

> Anyway, the above is about a global scale, so it is unrelated to the
> original issue which sounds like "Text size is twice bigger under GTK L&F".

It is related since we should decide how and when to use Xft.dpi.

-- 
Best regards, Sergey.