Op 22-02-18 om 04:54 schreef Stefan Schake: > Android assumes an implicit black background layer is always present > behind all layers it specifies for composition. drm_hwcomposer currently > punts responsibility for this to the kernel/DRM platform and puts layers > with per-pixel alpha content on the primary plane when requested. > > On some platforms (e.g. VC4) a background color fill has a cycle cost for > the hardware composer and is not enabled by default. Instead, userland can > request a background color through a CRTC property. Use this property to > specify the implicit black background Android expects. > > Signed-off-by: Stefan Schake <stschake@xxxxxxxxx> > --- > Kernel changes for this (background_color) are available here: > > https://github.com/stschake/linux/commits/background-upstream > > Sending as RFC because I'm not entirely clear on whose responsibility > this should be, on most DRM drivers it seems to be implicit. I think > a case could also be made that VC4 should not accept alpha formats on > the lowest layer or enable background color fill when given one anyway. > On the other hand, userland control over background color seems desirable > regardless and is a feature of multiple hardware composers (i915, vc4, omap). Ping? Would be nice if we were moving forward. :) _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
