a problem of display.
I have done following steps to overlay fb1 on fb0:
1. set the geometry of fb1 to fb0's geometry(ioctl(FBIOPUT_VSCREENINFO)).
2. call ioctl(MXCFB_SET_LOC_ALPHA) on fb1:
l_alpha.enable = 1;
l_alpha.alpha_in_pixel = 0;
3. output images to fb1's non-transparent area.
after those, I found that the screen goes black while moving mouse.
if moving stopped, the screen come back, images and controls will display.
how can I fix this bug?