bug#51381: HEIF image format support

[Stefan Kangas]

Lars Ingebrigtsen <larsi@gnus.org> writes:

> Stefan Kangas <stefan@marxist.se> writes:
>
>> A) If e.g. GraphicsMagick fails, shouldn't we try falling back to the
>>    other converters?
>
> Sure.  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.
>
>> B) Could the above error message be better?  For example, could it say
>>    which image converter(s) we tried?
>
> Sure.  Patches for a) and b) are welcome.  :-)

OK!  I will open two separate bug reports for that.

>> C) Shouldn't `image-use-external-converter' be t by default?
>
> I dunno...  there's security implications.

That's true.