xrender issue

[Hans-Peter Budek]

Hi,
> 
> So what I think you want to achieve is:
> 
>   dst = a * srcA + (1-a) * srcB

yes, that's my intension

> 
> which can be acheived (and hitting the accelerated paths) with:
> 
>   Picture a = XRenderCreateSolidFill(dpy, &(XRenderColor){.alpha = 0xffff * Fade});
>   Picture ia = XRenderCreateSolidFill(dpy, &(XRenderColor){.alpha = 0xffff * (1-Fade)});
>   XRenderComposite(dpy, PictOpSrc, srcA, a, dst, 0, 0, 0, 0, 0, 0, width, height);
>   XRenderComposite(dpy, PictOpAdd, srcB, ia, dst, 0, 0, 0, 0, 0, 0, width, height);
>   XRenderFreePicture(dpy, ia);
>   XRenderFreePicture(dpy, a);
> -Chris
> 
That work's much better (and avoids the crash). I thought the third parameter
of XRenderComposite() is something like a clipmask (after reading
http://www.x.org/releases/current/doc/renderproto/renderproto.txt), but it is
the missing multiplier.

I will use your approach.
Thank you very much.

Peter

Anyway, I wrote a little programm to reproduce the bug.
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