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 <[email protected]> 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" <[email protected]> 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 >> _______________________________________________ >> QGIS-Developer mailing list >> [email protected] >> List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer >> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer > > > _______________________________________________ > QGIS-Developer mailing list > [email protected] > List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer > -- Alessandro Pasotti w3: www.itopen.it
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