memset() is more than 10x faster than manual loop.
Thus we replace it to manipulate buffer pixels.
Change-Id: If0f255578f7d49ff6704c4f15e2eefe435cc3c15
Introduce project skeleton such as build envrionment and interfaces
to build up code further cooperatively.
Change-Id: Ie9ac38991f609d33637283134906d7cc3f2ac19e