Set the pointer surface, i.e., the surface that contains the
pointer image (cursor). This request gives the surface the role
of a cursor. If the surface already has another role, it raises
a protocol error.
The cursor actually changes only if the pointer
focus for this device is one of the requesting client's surfaces
or the surface parameter is the current pointer surface. If
there was a previous surface set with this request it is
replaced. If surface is NULL, the pointer image is hidden.
The parameters hotspot_x and hotspot_y define the position of
the pointer surface relative to the pointer location. Its
top-left corner is always at (x, y) - (hotspot_x, hotspot_y),
where (x, y) are the coordinates of the pointer location, in
surface-local coordinates.
On surface.attach requests to the pointer surface, hotspot_x
and hotspot_y are decremented by the x and y parameters
passed to the request. Attach must be confirmed by
wl_surface.commit as usual.
The hotspot can also be updated by passing the currently set
pointer surface to this request with new values for hotspot_x
and hotspot_y.
The current and pending input regions of the wl_surface are
cleared, and wl_surface.set_input_region is ignored until the
wl_surface is no longer used as the cursor. When the use as a
cursor ends, the current and pending input regions become
undefined, and the wl_surface is unmapped.
set the pointer surface
Set the pointer surface, i.e., the surface that contains the pointer image (cursor). This request gives the surface the role of a cursor. If the surface already has another role, it raises a protocol error.
The cursor actually changes only if the pointer focus for this device is one of the requesting client's surfaces or the surface parameter is the current pointer surface. If there was a previous surface set with this request it is replaced. If surface is NULL, the pointer image is hidden.
The parameters hotspot_x and hotspot_y define the position of the pointer surface relative to the pointer location. Its top-left corner is always at (x, y) - (hotspot_x, hotspot_y), where (x, y) are the coordinates of the pointer location, in surface-local coordinates.
On surface.attach requests to the pointer surface, hotspot_x and hotspot_y are decremented by the x and y parameters passed to the request. Attach must be confirmed by wl_surface.commit as usual.
The hotspot can also be updated by passing the currently set pointer surface to this request with new values for hotspot_x and hotspot_y.
The current and pending input regions of the wl_surface are cleared, and wl_surface.set_input_region is ignored until the wl_surface is no longer used as the cursor. When the use as a cursor ends, the current and pending input regions become undefined, and the wl_surface is unmapped.