Tilings now have a flexible origin and are stored with the
tile layer. This allows to make the first tile centered
in the viewport, allowing for faster getting a complete
viewport.
This also fixes some rendering bugs caused by forgetting
tiles the were still needed. But not all of them.
Fixes#83, #94
Issue #82
Part-of: <https://gitlab.gnome.org/Incubator/loupe/-/merge_requests/179>
This adds proper support for a lot of image formats including SVGs.
It will be the basis for many features to come. The technical core
is an asynchronous renderer that can arrange textures in smaller tiles
which might be generated on demand.
Closes#34, #40, #41, #49
Basis for fixing the following issues #7, #27, #36, #43, #68, #71
