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Simon Ser 0817c52a21 backend/drm: get rid of BO handle table ... The BO handle table exists to avoid double-closing a BO handle, which aren't reference-counted by the kernel. But if we can guarantee that there is only ever a single ref for each BO handle, then we don't need the BO handle table anymore. This is possible if we create the handle right before the ADDFB2 IOCTL, and close the handle right after. The handles are very short-lived and we don't need to track their lifetime. Because of multi-planar FBs, we need to be a bit careful: some FB planes might share the same handle. But with a small check, it's easy to avoid double-closing the same handle (which wouldn't be a big deal anyways). There's one gotcha though: drmModeSetCursor2 takes a BO handle as input. Saving the handles until drmModeSetCursor2 time would require us to track BO handle lifetimes, so we wouldn't be able to get rid of the BO handle table. As a workaround, use drmModeGetFB to turn the FB ID back to a BO handle, call drmModeSetCursor2 and then immediately close the BO handle. The overhead should be minimal since these IOCTLs are pretty cheap. Closes: https://github.com/swaywm/wlroots/issues/3164		3 years ago
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drm	backend/drm: get rid of BO handle table	3 years ago
headless	output: add presented flag to presentation event	3 years ago
libinput	backend/libinput: send hold gesture events	3 years ago
multi	backend/multi: implement get_buffer_caps	3 years ago
noop	backend/noop: drop attach_render/rollback_render	3 years ago
session	backend/session: use DRM_PRIMARY_MINOR_NAME	3 years ago
wayland	output: add presented flag to presentation event	3 years ago
x11	backend/x11: fix code style in get_touchpoint_from_x11_touch_id	3 years ago
backend.c	backend.c: do not try to explicitly clean up the libinput backend	3 years ago
meson.build	backend: make DRM and libinput backends optional	3 years ago