[RFC] drm: add overlays as first class KMS objects

Keith Packard keithp at keithp.com
Mon Apr 25 16:16:18 PDT 2011

On Mon, 25 Apr 2011 15:12:20 -0700, Jesse Barnes <jbarnes at virtuousgeek.org> wrote:

> Overlays are a bit like half-CRTCs.  They have a location and fb, but
> don't drive outputs directly.  Add support for handling them to the core
> KMS code.

Are overlays/underlays not associated with a specific CRTC? To my mind,
overlays are another scanout buffer associated with a specific CRTC, so
you'd create a scanout buffer and attach that to a specific scanout slot
in a crtc, with the 'default' slot being the usual graphics plane.

keith.packard at intel.com
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