[Mesa-dev] [PATCH 2/2] st/vdapu: use lanczos filter for scaling

[Nayan Deshmukh]

Hi Alan,

we could adjust the HQ options on either side i.e we could remove L2 as the
quality of the output
was really bad. I haven't tested the L8 and L9 personally as my hardware
won't allow
for it. But we can adjust it in case we want to implement other scaling
algorithms.

Regards,
Nayan.
On Mon, Jul 18, 2016 at 3:43 PM, Alan Swanson <reiver at improbability.net>
wrote:

> On 2016-07-14 21:58, Nayan Deshmukh wrote:
>
>> HIGH_QUALITY_SCALING_L2 to HIGH_QUALTIY_SCALING_L9
>> uses lanczos filter with number representing the size
>> of the sinc window.
>>
>
> Hi Nayan.
>
> While the number matching is nice, you are using up all the available
> vdpau HQ scaling slots.
>
> I personally prefer the Mitchell-Netravali bicubic filter with less
> ringing versus Lanczos filters and was going to look sometime into adding
> it based on your Hermite bicubic if no one else did. (I wonder if vdpau
> could be extended with a descriptive text field for HQ scalers.)
>
> Otherwise, I'd just like to say thanks for the work though.
>
> Alan.
>
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