Does Xorg'x XRender implementation support "better-than-bilinear" interpolation?

[Daniel Stone]

Hi,

On 11 September 2012 03:17, Pierre-Loup A. Griffais
<pgriffais at nvidia.com> wrote:
> On 09/10/2012 06:08 PM, Daniel Stone wrote:
>> 'Best' might be bicubic.  It might be nearest.  It might be anything,
>> it's just whatever the driver thinks will offer the best quality.
>>
>> Bicubic is not required to be offered, but it may be.
>
> I'm not very familiar with bicubic interpolation, but couldn't it be
> achieved using the 'convolution' filter with the adequate kernel? (possibly
> in several passes at different scales). AFAIK 'convolution' is always
> provided and often accelerated.

None of Intel UXA, Radeon EXA or Nouveau EXA accelerate convolutions.
They're not particularly widely used anyway (at least by Cairo et al),
probably because no-one accelerates them.

Cheers,
Daniel