This request sets an optional transformation on how the compositor
interprets the contents of the buffer attached to the surface. The
accepted values for the transform parameter are the values for
wl_output.transform.
Buffer transform is double-buffered state, see wl_surface.commit.
A newly created surface has its buffer transformation set to normal.
wl_surface.set_buffer_transform changes the pending buffer
transformation. wl_surface.commit copies the pending buffer
transformation to the current one. Otherwise, the pending and current
values are never changed.
The purpose of this request is to allow clients to render content
according to the output transform, thus permitting the compositor to
use certain optimizations even if the display is rotated. Using
hardware overlays and scanning out a client buffer for fullscreen
surfaces are examples of such optimizations. Those optimizations are
highly dependent on the compositor implementation, so the use of this
request should be considered on a case-by-case basis.
Note that if the transform value includes 90 or 270 degree rotation,
the width of the buffer will become the surface height and the height
of the buffer will become the surface width.
If transform is not one of the values from the
wl_output.transform enum the invalid_transform protocol error
is raised.
sets the buffer transformation
This request sets an optional transformation on how the compositor interprets the contents of the buffer attached to the surface. The accepted values for the transform parameter are the values for wl_output.transform.
Buffer transform is double-buffered state, see wl_surface.commit.
A newly created surface has its buffer transformation set to normal.
wl_surface.set_buffer_transform changes the pending buffer transformation. wl_surface.commit copies the pending buffer transformation to the current one. Otherwise, the pending and current values are never changed.
The purpose of this request is to allow clients to render content according to the output transform, thus permitting the compositor to use certain optimizations even if the display is rotated. Using hardware overlays and scanning out a client buffer for fullscreen surfaces are examples of such optimizations. Those optimizations are highly dependent on the compositor implementation, so the use of this request should be considered on a case-by-case basis.
Note that if the transform value includes 90 or 270 degree rotation, the width of the buffer will become the surface height and the height of the buffer will become the surface width.
If transform is not one of the values from the wl_output.transform enum the invalid_transform protocol error is raised.