MicroXwin 一个优化的 X Window Systems

转载时请注明出处和作者联系方式：http://blog.csdn.net/mimepp
作者联系方式：YU TAO <yut616 at sohu dot com>

看到一个 MicroXwin 系统，架构很适合嵌入系统，这里做个记录。
http://www.microxwin.com 国内好象不能直接访问，需要找些代理，或其他工具来访问。

MicroXwin implements graphics processing in the kernel as a
load module and provides a character driver interface to the associated X11
library.
MicroXwin is binary compatible to the Xlib API.

However it is neither client server nor network oriented. Graphics operations are implemented in

the linux kernel via a kernel module.

An open source Xlib library sends graphics commands to the kernel.

There is no network overhead and no context switch from X client to X server.

This makes our solution smaller and faster than traditional X Windows.
空间占用小：
The storage and run-time memory requirements for MicroXwin is much lower than Xorg server.

The sizes of the main compoenents for x86 are:

LibX11.so is 720K bytes.
LibXext.so is 7K bytes.
Kernel module x11.ko is 200K bytes.
The Xorg server has a disk footprint of 1.8MB with run time memory usage of 12MB.

This is much higher than the roughly 300Kbytes of kernel memory used by the kernel module.

Besides that MicroXwin does all bitmap rendering in the kernel and needs only a small set

of SNF fonts. The smallest MicroXwin distribution can fit within ~ 1MB of disk space.
不过商用有 license 问题。