[Mesa-dev] [PATCH 0/2] Implement lanczos interpolation filter

[Nayan Deshmukh]

Hi Andy,

Thanks for testing the patches!!

On Mon, Sep 19, 2016 at 5:24 AM, Andy Furniss <adf.lists at gmail.com> wrote:

> Andy Furniss wrote:
>
>> Nayan Deshmukh wrote:
>>
>>> This series implements lanczos interpolation filter.
>>>
>>> Andy, I have made some changes to the code. Can you test the
>>> patches. I hope the artifacts are reduced this time.
>>>
>>
>> The artifacts are still there.
>>
>
> :(

The higher levels involve a hell lot of calucations per pixel so the
decreased
fps is expected. I was thinking of having only 2 levels for lanczos filter
ie. 2 and 4.

Christian, will it be fine if we only have 2 levels (with kernel size 2 and
4) of
lanczos filter corresponding to HIGH_QUALITY_SCALING_L2 and L3?

Regards,
Nayan.

> To be a bit more precise 2 and 4 seem to be artifact free, unless I
> didn't find the right sample/scale factor. The others show similar
> artifacts to those seen previously.
>
> There is an offset so all images are down and left a bit, though this is
> often not obvious, when scaling down from 2160p to 1080p it causes a
> white line left and top which is very visible.
>
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