[Wayland-bugs] [Bug 777470] Scale factor too large on wayland backend with tiled monitors

[mutter (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=777470

--- Comment #11 from Dan Doel <dan.doel at gmail.com> ---
Oh, also, not sure if this information will help, but...

Now that I can easily compare the different scaling, I've noticed a 3 things.

1) The scaling is actually off by more than 2x vs 8x. It actually looks like
the too-large scaling is 8x larger than the appropriate scaling. If I make a
weston-terminal window that is 1/2 of the width of the normal scaling screen,
it becomes big enough to be 4 screens wide with the extra scaling.

2) The too-large scaling is not just rendering at 16x or whatever. It actually
looks like it's rendering at some lower scale factor and then being scaled up
by some other interpolation algorithm. I can see the grayscale in anti-aliased
text, for instance.

3) The mouse cursor acts oddly on the extra scaling monitor. On the 30Hz
monitor it is the size I expect. On the 60Hz monitor it is double the size I
expect when I hover over the desktop, and it is crisply drawn in that
situation. However, when I move it over a (Gnome or weston) window, it
increases in size again by arounnd 4x, and displays the same kind of
interpolated scaling look as the window.

So, it seems like the tiled display might be, somewhere, using both a 4x
scaling factor, and doing two types of scaling---one where the window draws
itself scaled, and one where the window image is blown up by 4x (perhaps
intended for windows that aren't HIDPI aware?).

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