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

[Denis Rouzaud]

Hi all,

This always sounded very obscure to me...
Alessandro, can you recommend any value to test?

Cheers,
denis

Le lun. 19 févr. 2018 à 07:45, Alessandro Pasotti <apasotti at gmail.com> a
écrit :

> Hi,
>
> sorry if this does not apply to mac (I'm not a Mac user), but did you try
> to experiment with the following environment variables?
>
> QT_AUTO_SCREEN_SCALE_FACTOR
> QT_DEVICE_PIXEL_RATIO
>
> the effect may be different with different Qt versions and platforms.
>
>
>
> On Mon, Feb 19, 2018 at 7:32 AM, Jeremy Palmer <palmerjnz at gmail.com>
> wrote:
>
>> 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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>>
>>
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>
>
>
> --
> Alessandro Pasotti
> w3:   www.itopen.it
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