Theme assets (checkboxes, troughs, etc.) are blurry in hidpi

[Cassidy James Blaede]

Ambiance appears to provide lodpi raster assets, which means all of these bits of the theme are not rendered crisply on hidpi displays. It would be best to redraw these assets with GtkCSS to enable crisp interface scaling, or at least find a way to provide vector or 2x assets.

[Cassidy James Blaede (cassidyjames)]

I chatted briefly with Daniel Fore of elementary, and he provided some more details.

In the elementary GTK theme, we use @2x assets for anything that cannot be done via GtkCSS. This means we provide pixel-doubled assets: https://github.com/elementary/stylesheet/tree/master/gtk-3.0/assets. This ensures crisp rendering on 2x displays.

For the Ubuntu themes, this would mean we'd need to render out pixel doubled raster assets from the original source vectors if possible, or redraw the assets pixel doubled if there are not vector sources.

[Cassidy James Blaede (cassidyjames)]

Attached is a full-res screenshot on a 4k pixel doubled display.

[Cassidy James Blaede (cassidyjames)]

Ah, it looks like this was fixed for @2x displays in Ubuntu 16.10.

[Cassidy James Blaede (cassidyjames)]

If the 16.10 theme could be backported to 16.04 that would be awesome (since there are HiDPI displays shipping with 16.04).