Enabling Blending and Video Overlays

TegraOverlayPriority is a 32-bit integer that is used to control overlay stacking order. The overlay with the lowest depth is in front of all others. This value has meaning only when multiple overlays are present on a display. This value can range between 0 and 255 (both values inclusive), where the default is 255.

TegraOverlayBlendmode determines how the X overlay is combined with the overlay behind it during scanout. Available modes are:

• Opaque (default)
• SourceAlphaBlend
• PremultSourceAlphaBlend

This value has meaning only when an external process has created a display that is behind the X server.