ARM9, Graphicx, X libraries

Hi,

I intend to design/create my own stand-alone GUI. I am using the ARM9
(AT91SAM9RL64), and the yagarto toolchain. The X libraries are a part of
this toolchain and provides various funtions to create objects, etc.

I have tried these functions (XDrawlines, XFillPolygon, etc) in
Linux(REDHAT) and got some ideas as to how these functions are to be
used.

However, i am a bit lost when i have to use these functions in the ARM9.
Could someone give me a head start as to how to implement these
functions in the ARM9.

I will be using SDRAM in my application for buffering the LCD. Oh, btw,
i'm using a 320 (RGB) x 240 resoultion LCD in 16 bit mode.

Please correct me if i'm wrongin saying the algorithm for the LCD
display will be as follows:

1. Map the RAM for LCD process.
2. assign a 'window' pointer for display (assuming i've set the basic
values of clipping, boundaries etc.)
3. create a pointer to an object (rect, line, etc.) that is linked to
the above window,and perform the function on this pointer (using XDraw,
etc)
4. NOW, output this to the RAM for refreshing.

Thanks