On Tue, Mar 25, 2014 at 01:55:40AM -0700, Ivan Kozic wrote: > Hi Luc and thanks for replying, > > Not sure I follow - I went deeper into the Qt structure yesterday. > Basically, Qt uses just a normal linux fb access (opens /dev/fb0 directly), > while my current no-GUI application (only used to display video from CSI) > is using more "advanced" way - it opens /dev/disp first and then requests a > layer from it, eventually opening /dev/fb just to execute > FBIOGET_LAYER_HDL_0 ioctl and then closes it. Afterwards, I just have an > endless loop in the program in which buffers from V4L2 exchange addresses > with buffers from display. > > To my understanding (I'm a bit fresh with all this), Qt should actually > also open /dev/disp and request a GUI layer (think it's called YUV layer in > the user manual for A20) for it, while my underlying V4L2 library should do > the same, but only requesting video layer instead of a GUI layer. This way, > underlying lib would do the video and provide controls, while overlay would > be in a different layer providing GUI which is linked with the controls. Is > this true? > > If so, there is no easy way to do it, as I would have to implement a > different display driver for Qt which would use layers instead of stupidly > opening /dev/fb0 (this is quite some work) + update my underlying library > to actually use display, again with layering. Just saying - compared to > Freescale kernel, this is far from walk in the park. As I said before, > Freescale provides a separate /dev/fb for every layer of the screen, which > is much easier to work with. > > But as I said, I might be completely wrong - what did you have in mind?
You should use the hw differently, i am not sure whether disp allows that though. Just wait until i finally deliver on my KMS driver, i still am too lethargic atm to make proper progress on it, although i have added some good lcd code in the last week. Luc Verhaegen. -- You received this message because you are subscribed to the Google Groups "linux-sunxi" group. To unsubscribe from this group and stop receiving emails from it, send an email to linux-sunxi+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
