there is 1px border at the top of the window that is not covered by our
title bar and the video below is visible. this broke in some newer macOS
version even so the calculation of size and position of the title bar is
still correct. add 1px the the height of the title bar to cover up the
unwanted border.
These have been build options since the waf build, but that doesn't
really make sense. The build can detect whatever macOS sdk version is
available and then use that information to determine whether to enable
the features or not. Potentially disabling multiple sdk versions doesn't
really make any sense. Because f5ca11e12b
effectively made macOS 10.15 the minimum supported version, we can drop
all of these checks and bump the required sdk version to 10.15. The rest
of the build simplifies from there.
when exiting fullscreen we set the window frame to a aspect fit frame of
the fullscreen frame to prevent aspect ration problems when animating.
though that intermediate frame was set too early and before the system
knew we already exited the fullscreen. because of that the frame we set
could not be properly set and its origin was defaulted to the bottom
left corner for exactly one display refresh and only after that the
wanted frame was set. this led to a (dark) grey area on the right or
top depending on the aspect ratio difference of the screen and video.
to prevent this set the intermediate frame in the animation group to
make it sync with the system's fullscreen behaviour.
Fixes#8371
move all backend independent code parts in their own folder and files,
to simplify adding new backends. the goal is to only extend one class
and add the backend dependent parts there. usually only the (un)init,
config and related parts need to be implemented per backend. furthermore
all needed windowing and related events are propagated and can be
overwritten. the other backend dependent part is usually the surface for
rendering, for example the opengl oder metal layer.
in the best case a new backend can be added with only a few hundred
lines.
