Broken rendering on high DPI displays on Windows

[tiffany352]

System:

• Nheko version: Latest release and latest nightly both repro it.
• Installation method: The installer exe.
• Operating System: Windows 10

Actual behavior

This is a Dell XPS 13 with a 13.3" 3200x1800 display, around 250 DPI. It's configured out of the box to use a UI scale factor of 250%.

Expected behavior

For the UI to be readable without a magnifying glass.

In my (limited) experience working with Qt apps, this can be fixed by enabling AA_EnableHighDpiScaling before creating the QApplication.

Enabling compatibility mode so that the application gets bitmap upscaled would "fix" it, but I'd sooner use another client instead.

[mujx]

@tiffany352 Could you test if this build (https://bintray.com/mujx/matrix/nheko/hdpi-scaling-test/#files/nheko/hdpi-scaling-test) works?

[tiffany352]

@mujx Yeah, that build works.

[nermolov]

HiDPI scaling does not work on master for me either (Arch, i3). That test build above works but scales too greatly - I have a 1440p display (not 4K) and as such 2x scaling ends up looking like a toy.

[dessalines]

This is still broken on arch.

[nermolov]

@dessalines the issue is that nheko doesnt detect hidpi (yet), but you can set the qt scaling factor manually like so:

env QT_SCALE_FACTOR=1.5 nheko

I'm using 1.5 for a 1440p 13in display, 4k should probably be 2

Works perfectly