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Part-of: <!331>

GstVaapiMiniObject and GstVaapiObject are deprecated.

This is the first step to remove them by porting GstVaapiSurface as
a GstMiniBuffer descendant.
Signed-off-by: Víctor Manuel Jáquez Leal <vjaquez@igalia.com>

GstVaapiMiniObject and GstVaapiObject are deprecrated. This is the
first step to remove them, by porting GstVaapiImage as a
GstMiniObject.
Signed-off-by: Víctor Manuel Jáquez Leal <vjaquez@igalia.com>

This makes way for adding unit (check) tests.

Credit original authors on a per-file basis as we cannot expect people
to know all country-specific rules, or bother browsing through the git
history.

Add image_generate_full() function to create interleaved color rectangles.
If flags is zero, the whole frame is generated with a unique pattern. If
flags is non-zero, then each field is handled individually.

Fix RGB to YUV conversion to preserve full data range.

On some platforms, vaPutImage() would fail even if it does not involve
color format conversion or scaling, whereas copying raw pixels through
vaDeriveImage() could work instead.

Add support for packed YUV 4:2:2 formats, i.e. YUY2 and UYVY.

U/V planes were reversed, thus producing invalid images.

Fix new internal video format API, based on GstVideoFormat, to not
clobber with system symbols. So replace the gst_video_format_* prefix
with gst_vaapi_video_format_ prefix, even if the format type remains
GstVideoFormat.

Add the necessary helpers in GstVaapiDisplay to determine whether subpictures
with global alpha are supported or not. Also add accessors in GstVaapiSubpicture
to address this feature.
Signed-off-by: Gwenole Beauchesne <gwenole.beauchesne@intel.com>