Is interpolation of image-border specified by Render?

[Maarten Maathuis]

On Sat, Oct 18, 2008 at 12:35 PM, Clemens Eisserer <linuxhippy at gmail.com> wrote:
> Hi Maarten,
>
>> 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.
> Yes I created one, http://pastebin.com/f729a71aa
> The testcase works perfectly with pixman (even with much higher
> scale), but on intel seems the mask has too small x/y values.
> Would be really interesting how other hardware/drivers behave ;)
>
>>Have you
>> tried using a 1x1 mask pixel and scaling that an integer amount?
> I used a 16x16 mask ... just without any further thinking, thought it
> would give me more headroom till I hit precision limits.
> I've now tried it with a 1x1 mask (as in the attached testcase), its the same.
> It seems only to work when mask is 0.75-1.5 of the size of the source,
> otherwise the pixel-borders differ :-/
>
> Thanks, Clemens
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Where do these transformation matrices come from?

Maarten.