If the compositor is running without a renderer, that means that
the compositor must be driven by something external that may or may not
be there. So we have two scenarios:
1. This compositor is currently being watched and driven by some
external source that is consuming buffers. This is okay, because
during the commit handler `surface->current.buffer` and
`surface->buffer_damage` will be usable and things will be handled
like normal.
2. Things break however if the compositor is not currently driven. This
however is commonly temporary. Something may not be interested right now,
but later it can be. In this case we have to accumulate state until
this external consumer is ready. Here, we have to accumulate the
`buffer_damage` and keep the buffer locked until the consumer is ready.
`wlr_surface_consume` needs to be called when the state of this surface
was consumed so that it is safe to release these resources.
wlr_compositor will now wait for the current buffer to be released before
clearing relevant state. For now, this will always happen at the end of
the commit so there should be no functional change here.
Since wlr_raster supports wlr_compositor usage with and without a renderer,
use it for wlr_curosr so cursors support running on a surface without
a renderer.
The prerelease signal lets users do things things at the last moment
that would be inappropriate to do on the release signal. Inside the
prerelease signal, it is allowed to lock the buffer and also
upload/import the contents of the buffer to a texture.
This piece of code checks for multi-GPU renderer support, so it
needs to run after the renderer is initialized.
Fixes: 514c4b4cce ("backend: add timeline feature flag")
Closes: https://github.com/swaywm/sway/issues/8382
Since wlr_damage_ring now only works with buffer local coordinates, this
creates an inpedance mismatch for compositors that want to use this
function. Instead of compositors needing to the the conversion itself,
change thu function to take buffer local coordinates directly.
The output feature flag has a flaw: it's not possible to check
whether the backend supports timelines during compositor
initialization when we need to figure out whether we want to enable
the linux-drm-syncobj-v1 protocol.
Introduce a backend-wide feature flag to indicate support for
timelines to address this defect.
Closes: https://gitlab.freedesktop.org/wlroots/wlroots/-/issues/3904
This wasn't that great:
1. Now that damage ring tracks damage across actual wlr_buffer objects,
it can use the buffer size to do any sort of cropping that needs to
happen.
2. The damage ring size really should be the size of the transformed
size of the output. Compositors currently have to call
`wlr_damage_ring_set_bounds()` where it might not be clear when to
call the function. Compositors can just check against the actual
output bounds that they care about when processing the damage.
Fixes: #3891
Instead of calling xcb_flush() directly, wait until the FD is
writable.
Ideally we'd have a non-blocking variant instead of xcb_flush(),
but libxcb doesn't have this. Also libxcb blocks when its internal
buffer is full, but not much we can do here.
This serves as a bad example: compositors should validate serials from
events instead. Also, the current implementation segfaults if
focused_surface is NULL.
After a connector scan, new connectors might have appeared and old ones
gone away. At this point, old CRTC allocations are already gone, while
new allocations are not yet needed. Skip the call.
