Is interpolation of image-border specified by Render?

[Clemens Eisserer]

Hi again,

Sorry I completly forgot that the black pixels I see are caused by
another bug in the intel-driver, which is only visible on <i965.
This bug causes areas out of source-surface-bounds to appear black
instead of transparent, so if your driver does that properly you
shouldn't see the artifacts, even if they are there.
On my 945GM with latest intel-git it looks like this:
http://picasaweb.google.com/linuxhippy/Mask_Transformation#

So it seems the mask is a moved a bit left/up, thats why pixel show up
which are outside of source-surface bounds.
I am currently trying to write a test-case which does not depend on
that behaviour, but seems not that easy :-/

Thanks for your patience, Clemens


2008/10/18 Maarten Maathuis <madman2003 at gmail.com>:
> On Sat, Oct 18, 2008 at 12:52 PM, Clemens Eisserer <linuxhippy at gmail.com> wrote:
>>> Where do these transformation matrices come from?
>> They were created by the Java AffineTransform class.
>> I just dumped it and copied it into the C file.
>>
>> I basically get an AffineTransformation instance (set by the "user"),
>> inverse it and set it on the source.
>> For the mask I do exactly the same, except I scale it up, by the needed amount.
>>
>> - Clemens
>> _______________________________________________
>> xorg mailing list
>> xorg at lists.freedesktop.org
>> http://lists.freedesktop.org/mailman/listinfo/xorg
>>
>
> What are the precise artifacts you see?
>