It's the 10 bit equivalent to NV12 and uses the same layout as P016, i.e.
16 bit components with the lowest 6 bits set to 0 (padding), allowing us
to use 16 bit "subformats".
Thus adding support is quite trivial as we can reuse the NV12 shader.
The format is widely supported in decoding and display hardware (on Intel
since Kaby Lake), as well as modern codecs (AV1, VP9, HEVC) and has
visible quality advantages over NV12.
Note that the additional colors are lost if composited to a 8 bit RGB
framebuffer. Switching between direct scanout and compositing can thus
cause quality differences. This is no new phenomena, however, as the
same is the case already for e.g. GL clients using 10 bit formats -
including video players.
Also note that P012 and P016 could trivially added as well - it's not
done here as they are uncommen and thus hard to test.
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3244>
They are needed as "subformats" for higher bit YCbCr formats, such as
P010, and we don't plan to use or expose them otherwise. Thus don't
implement any conversion or packing features.
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3244>
Dropped obsolete Free Software Foundation address pointing
to the FSF website instead as suggested by
https://www.gnu.org/licenses/gpl-howto.html
keeping intact the important part of the historical notice
as requested by the license.
Resolving rpmlint reported issue E: incorrect-fsf-address.
Signed-off-by: Sandro Bonazzola <sbonazzo@redhat.com>
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3155>
So they can be derived from the DRM format as well.
While updating the users, ensure we don't announce support for
DRM formats in zwp_linux_dmabuf_v1 if the MetaMultiTextureFormat is
INVALID. This will be used for YUV subformats in following commits.
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2191>
1. Move into the new 'common' folder and build for Wayland as well
so we will be able to share the code in follow-up commits.
2. Rename to cogl-drm-formats to make it more obvious that the format
map is more than an utility these days.
3. Drop the unused CoglTextureComponents part (see also previous
commit).
4. Move the map to the header, simplifying some future use-cases.
5. Sync formats with MetaWaylandBuffer and MetaWaylandDmaBufBuffer and
also use newly introduced opaque formats where appropriate.
This avoids duplicated code, ensures that new drm-formats added to
the dmabuf protocol have an adequate representation in Cogl from which
information like alpha support can be easily derived and finally
ensures we don't crash if the mappings got out of sync.
6. Remove some likely untested formats. In case some of these are
actually needed on certain hardware, we can test whether we got
the correct mapping by also adding support for the corresponding
wl_shm_format in MetaWaylandBuffer by extending the gradient test in
https://gitlab.freedesktop.org/jadahl/wayland-test-clients
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3065>
