<div dir="ltr">Hi all,<div><br></div><div>This always sounded very obscure to me...</div><div>Alessandro, can you recommend any value to test?</div><div><br></div><div>Cheers,</div><div>denis</div></div><br><div class="gmail_quote"><div dir="ltr">Le lun. 19 févr. 2018 à 07:45, Alessandro Pasotti <<a href="mailto:apasotti@gmail.com">apasotti@gmail.com</a>> a écrit :<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>Hi,<br><br></div>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?<br><br>QT_AUTO_SCREEN_SCALE_FACTOR<br>QT_DEVICE_PIXEL_RATIO<br><br>the effect may be different with different Qt versions and platforms.<br><br><br></div><div class="gmail_extra"></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Feb 19, 2018 at 7:32 AM, Jeremy Palmer <span dir="ltr"><<a href="mailto:palmerjnz@gmail.com" target="_blank">palmerjnz@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="auto">Thanks for starting this thread Nyall. <div dir="auto"><br></div><div dir="auto">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 <span style="font-family:sans-serif">panning and zooming</span> on Macosx and burning through many More CPU cycles than 2.18 for the same operations.</div><div dir="auto"><br></div><div dir="auto">Cheers</div><span class="m_-581810650625593955HOEnZb"><font color="#888888"><div dir="auto">Jeremy</div></font></span></div><div class="m_-581810650625593955HOEnZb"><div class="m_-581810650625593955h5"><div class="gmail_extra"><br><div class="gmail_quote">On 19/02/2018 19:14, "Nyall Dawson" <<a href="mailto:nyall.dawson@gmail.com" target="_blank">nyall.dawson@gmail.com</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hey all (specifically OSX devs)<br>
<br>
>From a few open bug reports we have against the OSX build of 3.0, I<br>
gather that the OSX builds currently are not correctly handling hidpi<br>
screens.<br>
<br>
My understanding is that the builds are silently trying to scale the<br>
UI by pixel doubling/scaling - it's resulting in bugs like<br>
<a href="https://issues.qgis.org/issues/18043" rel="noreferrer" target="_blank">https://issues.qgis.org/issues/18043</a>,<br>
<a href="https://issues.qgis.org/issues/17773" rel="noreferrer" target="_blank">https://issues.qgis.org/issues/17773</a>, and<br>
<a href="https://issues.qgis.org/issues/15984" rel="noreferrer" target="_blank">https://issues.qgis.org/issues/15984</a>.<br>
<br>
Does any OSX expert know why this is happening? I think the automatic<br>
pixel scaling should be switched off - while master isn't perfect with<br>
hidpi screens, it's usable and the benefits of the hidpi<br>
canvas/composer outweigh the remaining issues.<br>
<br>
Plus, I'd rather we use a single approach to hidpi scaling then have<br>
to worry about separate code paths for OSX.<br>
<br>
Nyall<br>
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