Re: Need advice on blitting to dword alignment

["Thomas S. Iversen" <zensonic@zensonic.dk>]

On Fri, Sep 12, 2003 at 06:09:56PM +0100, James Simmons wrote:

Hi Again

> The NVIDIA fbdev driver had the same problems. That is what struct 
> fb_pixmap is for. Since you need 32 bit padded images you would need to 
> fill in your own pixmap when you initalize the driver. Something like 
> this.
> 
> 	info->pixmap.addr = kmalloc(64*1024, GFP_KERNEL);
> 	info->pixmap.size = 64 * 1024;
>         info->pixmap.buf_align = 4;
>         info->pixmap.scan_align = 4;
>         info->pixmap.flags = FB_PIXMAP_SYSTEM;

[snip]

Thanks a million --- you guys truely rocks! The good part is, that
now my mono/font expansion blit actually works and I can actually feel
the improvement when scrolling around in emacs ;-) .... but it came at a cost it
seems:

* My software cursor became messed up/flashing. I suspect that the software cursor
  does not work with alignment>1, but is that right??
* Tux, which was nicely drawn using the software fallback before I changed the pixmap 
  alignment, became messed up.

It made me suspect that the software imageblit does not work when alignment>1,
and further tests seemed to support this. Can I fix it somehow? Or
is it fixed in later kernel versions? (I use 2.5.73 for development at the moment)

Regards Thomas


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