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downscale and convert in a single step #3357

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totaam opened this issue Nov 20, 2021 · 3 comments
Open

downscale and convert in a single step #3357

totaam opened this issue Nov 20, 2021 · 3 comments
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encoding enhancement New feature or request

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@totaam
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totaam commented Nov 20, 2021 •
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See #2052 and b764753

We should combine the scaling, re-striding and format conversion.
Also support swscale since Debian still does not package libyuv.

After potentially downscaling the image (if requested by the client):

  • webp may reformat it to BGRA or BGRX
  • jpeg should reformat it to RGB to save space (and leave it alone if not downscaling, or if using libyuv for scaling)
  • nvjpeg must convert to RGB or BGR (could also support GBRP)

See also #3370
This was referenced Nov 20, 2021
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totaam added a commit that referenced this issue Nov 29, 2021
@totaam
#2984 / #3357 csc and downscale using a CUDA kernel
749598a 
accept BGRX as input and convert it to RGB using a cuda kernel,
downscaling it if necessary
This was referenced Dec 4, 2021
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@totaam
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totaam commented Dec 7, 2021 •
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See also: #2773, #839, #1597, #3370

spng also needs to call unpremultiply_argb: 644e061

@totaam totaam added enhancement New feature or request encoding labels Dec 3, 2022
@totaam
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totaam commented Feb 21, 2023 •
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Related, but nvidia only: https://github.com/NVIDIA/DLSS - https://github.com/NVIDIAGameWorks/NVIDIAImageScaling, https://github.com/NVIDIA/nvcomp

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totaam commented Aug 28, 2023

Update: Debian is now packaging libyuv and swscale has been removed.

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