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

[Andy Furniss]

Nayan Deshmukh wrote:
> 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?

2 and 4 still have the offset issue, which does sometimes cause the
white line.

I've found another issue with 2 and 4 = unscaled with a raster locked
res test the 1 pix detail will be lost. The detail does re-appear if you
scale up.

bz2 compressed vid showing the issue -

https://drive.google.com/open?id=0BxP5-S1t9VEEUE5sbUFBV20zSms