Enable HiDPI Scaling (Qt 5.6+ only) [stable-1.2]

[ghost]

This pull request is based on the stable-1.2 branch. Hopefully it will solve the long-standing UI scaling issue of LMMS. Tested on Ubuntu 16.04 via an AppImage.

[tresf]

@flynn16 thanks for rebasing this against stable-1.2. Before this is merged, I think we owe it to the project to also test this on MacOS.

The code is:

<key>NSPrincipalClass</key>
<string>NSApplication</string>
<key>NSHighResolutionCapable</key>
<string>True</string>

The file it will eventually reside in is here:
https://github.com/LMMS/lmms/blob/stable-1.2/cmake/apple/lmms.plist.in

Does anyone subscribed to the project have a Mac with a retina display that can test out the plist option? They would need to compile from this PR.

[lukas-w]

@tresf I dont't see any difference between stable-1.2 and this branch with Qt 5.9.1. The UI is scaled properly in both cases.

[tresf]

@lukas-w Thanks. Do you have a retina display? If Qt is already scaling on retina, we'll keep the XML changes to be consistent with the official Qt documentation and just not make it a requirement before merging.

[ghost]

One more problem, the PPA used for cross compiling contains an old Qt 5. Perhaps someone should contact the PPA maintainer or build Qt 5.9 manually.

[tresf]

Perhaps someone should contact the PPA maintainer or build Qt 5.9 manually.

Thanks for the recommendation. His name is @tobydox and yes he's aware and working on updating the repos. They'll be under a 16.04 repo moving forward but can be safely force-installed onto 14.04 in Travis-CI.

If a new Qt build for Windows fixes the scaling issues there too, we can remove our hack which forces the exact opposite.

[lukas-w]

Do you have a retina display?

Yes. Most icons also appear pixelated due to upscaling, just like in the sreenshot in #2510 (comment).

[tresf]

Thanks for the feedback. Merging. This is a small commit, so it's easy to revert if it causes more issues down the road.

[Redsandro]

I've just downloaded the AppImage version for Linux, so I have 1.2.0-rc5 (Linux/x86_64, Qt 5.9.2, GCC 4.8.4). However, everything is still microsized. Am I missing some setting to enable the scaling?

[ghost]

If it fails to scale automatically, try setting the QT_* environment variables before launching the AppImage. $ export | grep 'QT' $ export QT_SCREEN_SCALE_FACTORS='' $ export QT_AUTO_SCREEN_SCALE_FACTOR='1' $ ./lmms.AppImage

…

On Sat, Apr 28, 2018 at 11:32 AM, Sander Steenhuis ***@***.*** > wrote: I've just downloaded the AppImage version for Linux, so I have 1.2.0-rc5 (Linux/x86_64, Qt 5.9.2, GCC 4.8.4). However, everything is still microsized. Am I missing some setting to enable the scaling? — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#3814 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AVcBmdDyN16XthorZtoaN_2flpf_Jplnks5ttLWsgaJpZM4Pb5S3> .

[Redsandro]

@flynn16 thank you. The interface indeed scales nicely this way.

However, some fonts (menu, instrument panel) stay small while others (track titles) scale properly. Is there a setting for this I have missed?