Re: [FFmpeg-devel] [FFmpeg-cvslog] swscale: use 16-bit intermediate precision for RGB/XYZ conversion

[Michael Niedermayer <michael@niedermayer.cc>]

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On Fri, Mar 14, 2025 at 12:54:25AM +0100, Michael Niedermayer wrote:
> Hi
> 
> On Sun, Jan 26, 2025 at 07:26:59PM +0100, Michael Niedermayer wrote:
> > On Thu, Dec 26, 2024 at 07:33:23PM +0000, Niklas Haas wrote:
> > > ffmpeg | branch: master | Niklas Haas <git@haasn.dev> | Mon Dec 16 14:49:39 2024 +0100| [af6d52eec66961f6a502b0f2f390c12226d087cd] | committer: Niklas Haas
> > > 
> > > swscale: use 16-bit intermediate precision for RGB/XYZ conversion
> > > 
> > > The current logic uses 12-bit linear light math, which is woefully insufficient
> > > and leads to nasty postarization artifacts. This patch simply switches the
> > > internal logic to 16-bit precision.
> > > 
> > > This raises the memory requirement of these tables from 32 kB to 272 kB.
> > > 
> > > All relevant FATE tests updated for improved accuracy.
> > > 
> > > Fixes: #4829
> > > Signed-off-by: Niklas Haas <git@haasn.dev>
> > > Sponsored-by: Sovereign Tech Fund
> > > 
> > > > http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=af6d52eec66961f6a502b0f2f390c12226d087cd
> > > ---
> > 
> > this breaks on x86-32
> 
> ping
> 
> the fate tests for a major architecture are broken since this
> This impacts future bisections over that range for example

It also prevents others from easily seeing other failures as x86-32 is
already broken

thx

[...]

-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Freedom in capitalist society always remains about the same as it was in
ancient Greek republics: Freedom for slave owners. -- Vladimir Lenin

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