Using Overlay on beagleboard

Recently I am trying to make 0xdroid use YUV Overlay in OMAP3 on beagleboard to play video. The purpose is utilizing the overlay in DSS system to accelerate by getting rid of the effort of the composition of different layers on software side and colorspace conversion to RGB.

For achieving this, we should get a libopencorehw module for opencore in Android. The implementation of libopencorehw can use the video-out driver, a V4l2 provider to interface DSS, like in TI's omapzoom tree. Unfortunately this way stuck me for a while, either there has problem in video-out driver or in TI's liboverlay.

After figuring out for a while, we met up another way for this, making libopencorehw use DSS ioctl directly. So we rewrite libopencorehw as simple as it looks and here is the new libopencorehw in 0xdroid. This way is more lightweight and easier to me. Welcome to try.