iMX6 Local Alpha

richogrady — Thu, 05 Oct 2017 17:21:25 GMT

We are using local alpha (not in pixel but in a separate buffer) to combine a graphic plane and a video plane in kernel 4.1.15. Everything works fine except whenever turning local alpha on or off via ioctl MXCFB_SET_LOC_ALPHA, the screen flashes. We tracked this down to mxc_ipuv3_fb.c where the ioctl is handled. It seems this ioctl will always call the function mxcfb_set_par(). This function basically does a full reinit of fb0 and fb1 and causes the flashing. Turning global alpha on and off does not have such an issue. Isn't there a cleaner way to turn on local alpha?

Re: iMX6 Local Alpha

b36401 — Fri, 06 Oct 2017 08:42:41 GMT

Here is an example for global alpha and local alpha:

https://community.nxp.com/thread/300324

Have a great day,
Victor

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i.MX ProcessorsのトピックiMX6 Local Alpha

iMX6 Local Alpha

Re: iMX6 Local Alpha