Compiz shadow breakage related to pixman

[Michel Dänzer]

On Fri, 2007-06-01 at 16:53 +0200, Soeren Sandmann wrote:
> Michel Dänzer <michel at tungstengraphics.com> writes:
> 
> > With current xserver master on my PowerBook, the shadows drawn by compiz
> > (well, really gtk-window-decorator) have a hard edge instead of being
> > soft as intended. See the attached image.
> > 
> > As far as I've been able to determine[0] this was introduced with commit
> > c5ef84c325440af5fbdf9f44c3781d99a0392df9 ('Make the general compositing
> > code create a pixman image and call pixman_image_composite().').
> > 
> > Since nobody else has reported this I'll assume it's platform specific.
> > The two usual suspects would be endianness and char being unsigned by
> > default. When I get time, I could try building pixman with -fsigned-char
> > to test for the latter. Let me know if there's anything else I can do to
> > narrow this down further.
> 
> Note that pixman didn't have any endianness detection until pixman
> commit e32b240145ee7bbc2e69020b0bb00c33c68acf15 on May 22nd. So any
> pixman older than that should be expected to be broken on ppc.

I didn't notice any other issues before or after that.

> If this really is platform specific, then information about the
> composite operation and the depths and formats of the drawables
> involved would be necessary since I don't have any big-endian or
> unsigned-char platforms to test on. 

AFAICT gtk-window-decorator uses Cairo to draw the shadows, so I'm not
sure how to determine that. Any guidance would be appreciated.

> I'll try and get a system set up with compiz to see if I can reproduce.

Excellent, thanks.


-- 
Earthling Michel Dänzer           |          http://tungstengraphics.com
Libre software enthusiast         |          Debian, X and DRI developer