gtk3 and hidpi status ?

Tomaž Vajngerl tomaz.vajngerl at
Tue Sep 20 13:11:46 UTC 2016


On 20/09/16 13:46, Caolán McNamara wrote:
> There was a commit (2a19bb85cbe83aa031871a3689b9ff03629da548) last year
> wrt to hidpi and gtk3. I assume that hidpi isn't just working correctly
> right out of the box, right ? Do you know what we should be doing here
> ?
> .
The initial problem was that gtk3 detected HiDPI correctly, however it 
reported the DPI as 96 and has an additional scale factor parameter for 
a window if it is scaled (gdk_window_get_scale_factor). It also scaled 
the windows surface by 2 - which means the content was blurry and not 
really usable.

As we scale depending on DPI value I adjusted that by multiplying our 
stored DPI with scale factor that gtk3 reported and disabled window 
scaling in gtk3 (the commit). With this it works about the same as gtk2 
for me. The only problem I know that is related to gtk3 is that the file 
dialog isn't scaled correctly - not fonts, only icons and whitespace.

OTOH, LO isn't scaled correctly when it is running with gtk3 under 
wayland but I didn't look into that. I wanted to research what Firefox 
sets when they detect HiDPI and use their solution as they have the same 
problem as we do (they draw widgets and other window content themselves).

Regards, Tomaž

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