Xfbdev based server acceleration without offscreen pixmap?

Daniel Stone daniel at fooishbar.org
Sat Sep 29 09:00:22 PDT 2007

On Sat, Sep 29, 2007 at 06:16:44PM +0800, MD Tsai wrote:
> I'm working for Xfbdev based server KAA acceleration. After reading mailing
> list, I found this is discussed before. But I still failed.
> When I trace to kaa.c, in kaaDrawInit, there are two condition to hookup
> offscreen pixmap. First is the flag, this is already set to
> Second is "screen->off_screen_base < screen->memory_size". In my case,
> off_screen_base is equal to memory size so it is impossible to hookup.
> If I want to hook KAA, should I modify frame buffer's driver to let
> memory_size > off_screen_base or any other things to do? Please give me some
> hints about this.

Yes, you need to get a larger memory size.  When off_screen_base ==
memory_size, that means that there is zero room for off-screen pixmaps:
the start of the range is the end of the range.

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