[QGIS-Developer] Incorrect hidpi setting in 3.0 for OSX

[Jeremy Palmer]

Thanks for starting this thread Nyall.

Ian not sure if it's relates to the HiDPI changes that occurred recently
(e.g maptool cursors becoming small) but I've also noted that since Xmas
the canvas is very sluggish when panning and zooming on Macosx and burning
through many More CPU cycles than 2.18 for the same operations.

Cheers
Jeremy

On 19/02/2018 19:14, "Nyall Dawson" <nyall.dawson at gmail.com> wrote:

> Hey all (specifically OSX devs)
>
> From a few open bug reports we have against the OSX build of 3.0, I
> gather that the OSX builds currently are not correctly handling hidpi
> screens.
>
> My understanding is that the builds are silently trying to scale the
> UI by pixel doubling/scaling - it's resulting in bugs like
> https://issues.qgis.org/issues/18043,
> https://issues.qgis.org/issues/17773, and
> https://issues.qgis.org/issues/15984.
>
> Does any OSX expert know why this is happening? I think the automatic
> pixel scaling should be switched off - while master isn't perfect with
> hidpi screens, it's usable and the benefits of the hidpi
> canvas/composer outweigh the remaining issues.
>
> Plus, I'd rather we use a single approach to hidpi scaling then have
> to worry about separate code paths for OSX.
>
> Nyall
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