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bug#51515: image-use-external-converter should fall back to another conv
From: |
Stefan Kangas |
Subject: |
bug#51515: image-use-external-converter should fall back to another converter if one fails |
Date: |
Sat, 30 Oct 2021 09:21:46 -0700 |
(This was previously discussed in Bug#51381.)
Summary: When `image-use-external-converter' is non-nil, don't just give
up if one fails, try another one.
I have both the GraphicsMagick and ImageMagick tools installed. The IM
"convert" command supports .heif images, the GM "gm" command does not.
Now I do:
0. curl --output /tmp/C001.heic \
https://raw.githubusercontent.com/nokiatech/heif_conformance/master/conformance_files/C001.heic
1. emacs -Q --eval '(setq image-use-external-converter t)' /tmp/C001.heic
This gives the error message "Unknown image type", as "gm" can't convert
it. It would be better if it could fall back to use "convert".
Lars Ingebrigtsen <larsi@gnus.org> writes:
> We could re-probe the converters when something fails and then
> use the other converter, for instance? Or we could just probe every
> time, but keep a table of what we've tried.
>
> Or we could probe all the converters at startup, and maintain a mapping
> of which converter does what -- that sounds cleanest.
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