On Don, 2010-07-01 at 13:32 +0800, Cui, Hunk wrote:
>
> I mean your suggestion, now in our geode driver, I have modified the
> Rotate_mem. Rotateddata has to be allocated between memoryBase and memorySize.
> Now my question: Please see the link:
> http://cgit.freedesktop.org/xorg/xserver/tree/exa/exa_classic.c#n170
> Code:
> if (pExaScr->info->memoryBase && pPixData) {
> if ((CARD8 *)pPixData >= pExaScr->info->memoryBase &&
> ((CARD8 *)pPixData - pExaScr->info->memoryBase) <
> pExaScr->info->memorySize) {
> pExaPixmap->fb_ptr = pPixData;
> pExaPixmap->fb_pitch = devKind;
> pExaPixmap->use_gpu_copy = TRUE;
> }
> }
> In Xserver 1.6, Does not exist the judge.
> In Xserver version >=1.7, Occur this judge.
>
> My question is:
> What is effect of the judge?
It considers the pPixData pointer passed in to be the GPU copy if it
falls within the offscreen memory range.
> What are the different between sys_ptr and fb_ptr?
From exa_priv.h:
CARD8 *sys_ptr; /**< pointer to pixmap data in system memory */
CARD8 *fb_ptr; /**< pointer to pixmap data in framebuffer
memory */
Basically, fb_* refer to the GPU copy, sys_* to the system memory copy
of the pixmap contents.
--
Earthling Michel Dänzer | http://www.vmware.com
Libre software enthusiast | Debian, X and DRI developer
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