[Bug 784599] kmssink: support videooverlay interface

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=784599

--- Comment #19 from Haihua Hu <jared.hu at nxp.com> ---
(In reply to Víctor Manuel Jáquez Leal from comment #17)
> Review of attachment 355380 [details] [review]:
> 

Thanks for your comments.

> ::: sys/kms/gstkmssink.c
> @@ +358,3 @@
> +  if (result) {
> +    self->can_scale = FALSE;
> +    GST_INFO_OBJECT (self, "scale is not support");
> 
> I don't like the idea of showing an empty (green?) frame to the user at
> start. Can we delay the expose call until the first show_frame() is called.

Is there any other way to check whether driver support scale or not? Why delay
expose can fix this problem?

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