Hey Ville, On Fri, Mar 2, 2018 at 3:43 PM, Ville Syrjälä <ville.syrj...@linux.intel.com> wrote: > On Fri, Mar 02, 2018 at 04:39:22PM +0200, Ville Syrjälä wrote: >> If you want the plane to always be opaque you shouldn't expose any >> formats with alpha. >> >> Also what happens if one disables the primary plane? Or does the driver >> not allow that? > > Or just makes the plane not cover the entire screen?
We've exposed alpha formats in the past so disabling that now would break userspace, certainly Android that chooses alpha-everything. The VC4 HVS has no fixed planes so I'll acknowledge that the concept of a primary plane is somewhat dubious and userspace could disable it or make it not cover the entire screen, making this ineffective. But then ultimately there doesn't seem to be a standard for what the display is supposed to be if you have transparent pixels with no plane to blend to below. This helps in the common case, the belts&braces fix would be to enable the VC4 HVS background color fill incurring a fixed overhead that in most cases is wasted because the composition ends up being opaque. Thanks, Stefan _______________________________________________ dri-devel mailing list firstname.lastname@example.org https://lists.freedesktop.org/mailman/listinfo/dri-devel