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This commit mostly duplicates the wlr_log functions, although
with a sway_* prefix. (This is very similar to PR #2009.)
However, the logging function no longer needs to be replaceable,
so sway_log_init's second argument is used to set the exit
callback for sway_abort.
wlr_log_init is still invoked in sway/main.c
This commit makes it easier to remove the wlroots dependency for
the helper programs swaymsg, swaybg, swaybar, and swaynag.
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render_background_image alters the scale that cairo uses. Depending on
the image mode, resolution, and image size, this may cause the surface
to be rendered increasingly smaller. By calling cairo_save and
cairo_restore, any changes to the cairo settings by the function are
not kept as a side effect.
The surface that swaybg uses is also now cleared before rendering a frame.
This is needed to avoid artifacts on resolution or scale changes with
certain combinations of image modes, resolutions, and image sizes. This
was also part of the increasingly smaller background visual since it
made it so it was not obvious the region being rendered to was smaller
and caused an increasing number of smaller images to be appear for each
hotplug.
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