[lkml]   [2003]   [Mar]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [Linux-fbdev-devel] Re: FBdev updates.
On Tue, 2003-03-04 at 04:35, Petr Vandrovec wrote:

> My main concern now is 12x22 font... Accelerator setup
> is so costly for each separate painted character that for 8bpp
> accelerated version is even slower than unaccelerated one :-(
> (and almost twice as slow when compared with 2.4.x).

I submitted a patch to James, which he already applied to his tree, that
addresses this problem. It conglomerates the series of bitmaps into 1,
so only one fb_imageblit is necessary. It should give faster painting
than the original 2.5.x code, hopefully faster than 2.4.x code, but
slower than 8x16 painting because of the additional packing.

> And one (or two...) generic questions: why is not pseudo_palette
> u32* pseudo_palette, or even directly u32 pseudo_palette[17] ?

Yes, all drivers should treat the pseudo_palette as u32* anyway, so why
not change pseudo-palette from void* to u32*?

> And why we do not fill this pseudo_palette with
> i * 0x01010101U for 8bpp pseudocolor and i * 0x11111111U for 4bpp
> pseudocolor? This allowed me to remove couple of switches and tests
> from acceleration fastpaths (and from cfb_imageblit and cfb_fillrect,
> but I did not changed these two in my benchmarks below).

I also agree for a different reason. Cards with unconventional formats
(such as monochrome at 8 bpp - 0 for black , 0xff for white) will not
work with the current code.


To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-03-22 13:33    [W:0.106 / U:1.740 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site