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#74476
[PATCH] Explore JPEG loading without quantization
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Your bug report
#74476: [PATCH] Explore JPEG loading without quantization
which was filed against the emacs package, has been closed.
The explanation is attached below, along with your original report.
If you require more details, please reply to 74476 <at> debbugs.gnu.org.
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74476: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=74476
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On Sun, Dec 01, 2024 at 12:13:53PM +0100, Manuel Giraud wrote:
> Alan Third <alan <at> idiocy.org> writes:
>
> > I think it should be done for each load. And I just noticed you need
> > to add a free_color_table call after you're done with it.
>
> Yes, I have re-add it in the attached new version of the patch. I also
> re-add the ir, ig and ib indices computation. WDYT?
Looks good to me.
I've pushed this to master. Thanks!
--
Alan Third
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Tags: patch
Hi,
While trying to speed up "emacs as an image viewer", I found that emacs
is using libjpeg with color quantization and it seems that removing this
quantization could speed up JPEG loading a bit.
My simple limited benchmark:
- M-: (clear-image-cache)
- Open an image in folder with some large enough pictures in
it (4000x3000 here)
- M-: (benchmark-run 10 (image-next-file 1))
Here are the results I get:
without this path: (5.415405491 1 0.09232176400000025)
with: (3.079911418 1 0.0751190459999993)
I don't think that this patch could be applied as is (it is rather
ugly). And I also think that I probably have missed some (many?) use
case (where color quantization is mandatory). But I'm submitting this
patch anyway as a conversation starter on the subject.
Thanks,
In GNU Emacs 31.0.50 (build 9, x86_64-unknown-openbsd7.6, X toolkit) of
2024-11-22 built on computer
Repository revision: c66c0942ea9ac10e6d6324e472150de403a03b69
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12101014
System Description: OpenBSD computer 7.6 GENERIC.MP#437 amd64
Configured using:
'configure CC=egcc CPPFLAGS=-I/usr/local/include
LDFLAGS=-L/usr/local/lib MAKEINFO=gmakeinfo --prefix=/home/manuel/emacs
--bindir=/home/manuel/bin --with-x-toolkit=lucid
--with-toolkit-scroll-bars=no --without-cairo
--without-compress-install'
[0001-Explore-JPEG-loading-without-quantization.patch (text/patch, attachment)]
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--
Manuel Giraud
This bug report was last modified 204 days ago.
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