[Mesa-dev] frontends/va/postproc: Use the actual image height when blitting

Thong Thai thong.thai at amd.com
Mon Nov 30 17:35:09 UTC 2020

Hi Ilia,

This was the issue I was trying to fix: 

It's doing a blit from 1088px (the actual video is only 1080px) to 
1440px. The blit code scales and uses both the 1080 box height and 1088 
resource height, but I'm guessing the small difference is the problem 
I'm dealing with:

                       u_bitcast_f2u(x_scale / src->width0),
                       u_bitcast_f2u(y_scale / src->height0),

p y_scale / src->height0
$4 = 0.000689338252

p y_scale / 1080
$6 = 0.000694444461

I'm not sure how to properly fix it though... any ideas would be 


Thong Thai

On 2020-11-30 10:52 a.m., Liu, Leo wrote:
> +Thong.
> -----Original Message-----
> From: mesa-dev <mesa-dev-bounces at lists.freedesktop.org> On Behalf Of Ilia Mirkin
> Sent: November 25, 2020 5:48 PM
> To: ML Mesa-dev <mesa-dev at lists.freedesktop.org>; Thai, Thong <Thong.Thai at amd.com>
> Subject: Re: [Mesa-dev] frontends/va/postproc: Use the actual image height when blitting
> Hi Thong,
> In this change:
> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fcgit.freedesktop.org%2Fmesa%2Fmesa%2Fcommit%2F%3Fid%3D49465babdb35d88ed8a283e925d6cd346255d50c&data=04%7C01%7Cleo.liu%40amd.com%7C92b8ad99a46447208c3008d891943b09%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637419413135677095%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=g1pJUxsSM68kEjNZ6VDJGufaOF1Wwcezl1ehezq8mqo%3D&reserved=0
> You appear to change the height of the underlying resource while doing a blit. This is never legal though -- the height of the resource is effectively immutable (and subject to various constraints). I'm not sure what issue you're having, but this is not the way to fix it.
> Cheers,
>    -ilia
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