Is interpolation of image-border specified by Render?

[Maarten Maathuis]

On Sat, Oct 18, 2008 at 11:39 AM, Clemens Eisserer <linuxhippy at gmail.com> wrote:
> Hi Maarten,
>
>> Bilinear and nearest are standard texture unit properties, this should
>> pose no difficulty for drivers.
> Good to know, thanks. I was a bit concerned when mixing both with src and mask.
>
>> As far as the mask goes, nearest
>> should guarantee a sharp border. I'd expect things to go ok with the
>> size if you keep in mind it's fixed point transformation, but i'm not
>> a 100% sure.
> Well, it seems to work perfectly with pixman, I don't see any problems
> over a very large scale range.
> However, when using the intel-driver I soon seem to hit precision
> limits, it works only in a very limited scale range.
> I also thought that I maybe could use the fact that clip-rects are
> transformed when set on source (to not having to fillRect the mask all
> then time), but this doesn't work with any driver I tried (nouveau,
> intel, nvidia binary).
> Seems I have to go the fillRect route and tile of the mask is too small :-/
>
> Thanks again, Clemens
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Do you have a test program or at least share the transformation matrix
you're using, because i'm curious why it fails so badly. Have you
tried using a 1x1 mask pixel and scaling that an integer amount?

Maarten.