Issue when host is running in low resolution (Windows only)

[lucianoiam]

Steps to reproduce (valid for current develop 92f0f97)

1. Compile examples
2. Right click on desktop -> Display Settings -> Scale and Layout -> Change the size of text, apps and other items -> 150%
3. Start a non-DPI aware host (like Live 10.1.5). It should look a bit blurry due to scaling.
4. Insert d_Parameters VST

Expected result:

• Host window remains unaffected

Actual result:

• Host window breaks

Background: on a small 13" 1080p screen system scaling comes handy; older apps look blurry but that's preferable to having microscopic text.

Looks like loading the plugin forces the host to "convert" into a DPI-aware process with unpredictable results due to pugl calling SetProcessDPIAware() (exact line here). Maybe it's a bit of an edge case but it wasn't happening a couple of weeks ago. If I correctly recall on earlier DPF versions the plugin just stayed lo-res (blurry) following the parent process configuration.

Probably that call should be issued only when running standalone and skip it for plugins?. Now I think any call that may have an effect on the process should be omitted when running as plugin.

Note on the attachment: it was shot via Remote Desktop but that does not affect the experiment, using a physical display leads to the same result.

dpf_hidpi.mov

[falkTX]

very interesting, I was not aware this could even happen!
I will report the issue upstream.

[falkTX]

Older versions of DPF used a very old pugl. As of last month I updated to latest upstream.

Can you confirm that removing SetProcessDPIAware fixes this issue?

[lucianoiam]

Makes sense. Yes, removing SetProcessDPIAware fixes the issue.

[falkTX]

Now fixed, patch submitted upstream at lv2/pugl#55