[Wayland-bugs] [Bug 758936] Widgets within an offscreen windows are blurry on wayland with hidpi

[gtk+ (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=758936

--- Comment #3 from Lionel Landwerlin <llandwerlin at gmail.com> ---
Created attachment 316640
  --> https://bugzilla.gnome.org/attachment.cgi?id=316640&action=edit
gdkoffscreenwindow: use embedder to derive surfaces & scale factor

In Gdk, a GdkOffscreenWindow parent has to be the root window. This is
problematic on Wayland because the root window doesn't necessary have the
right information with regard to scale factor.

This patch proposes to rely on the embedder, if available, to derive
surfaces as well as getting the scale factor.

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