Hi Ivo.
The function vgMask is the only way to modify the alpha mask.
As you can see from the specifications, it’s possible to use external VGImage(s) coupled with vgMask function.
Regards,
Matteo.
Do we always need support alpha mask? From the spec, I think it is an option. But in the vg 1.0 conformance test, it is tested regardless of EGLConfig. What’s your opinon?
The Alpha Mask always needs to be supported.
It’s destination surfaces that contain alpha channels which may or may not be supported based on the EGLConfig().