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Local Alpha Blending

Question asked by Saurabh Patel on Jul 26, 2013



Our setup  is like data from android surface flinger is available "/dev/graphics/fb0"

We want to do overlay with CSI buffer which is written on "/dev/graphics/fb1"


We are able to get it working with global alpha and colour keying. But due to some limitation with our GUI we can not use global alpha.


But If I disable global alpha and enable the local alpha than data from /dev/graphics/fb1 is not display.


- Is it possible to do alpha blending using local alpha without colour keying?

- What is a significance of alpha_phy_addr0, alpha_phy_addr1 and alpha_in_pixel?