The ::create-surface signal is emitted when an offscreen window
needs its surface (re)created, which happens either when the
window is first drawn to, or when the window is being
resized. The first signal handler that returns a non-NULL
surface will stop any further signal emission, and its surface
will be used.
Note that it is not possible to access the window's previous
surface from within any callback of this signal. Calling
OffscreenWindow.getSurface will lead to a crash.
The ::create-surface signal is emitted when an offscreen window needs its surface (re)created, which happens either when the window is first drawn to, or when the window is being resized. The first signal handler that returns a non-NULL surface will stop any further signal emission, and its surface will be used.
Note that it is not possible to access the window's previous surface from within any callback of this signal. Calling OffscreenWindow.getSurface will lead to a crash.