Re: [mng-list] Re: ... aPNG (Animated PNG)

>> Re:An unfortunate hack (Score:1)
>> by sppavlov (809156) Alter Relationship on Sunday August 29, @04:00AM (#10101282)
>> We are changing the format of APNG so that all the frames live
>> inside of a single IHDR/END. This should resolve any problems
>> you might have. v0.3 of the spec (should be out tomorrow) will
>> have these changes.

> If yesterday's aPNG didn't violate the PNG spec this certainly would.

Indeed.  Multiple unrelated IDATs with other chunks between them,
multiple palettes, ...  Other than the ability to use a stock libpng
to decode the first image, it's difficult to see any benefit to this
approach.  libpng will barf as soon as it encounters a chunk other
than IEND, tEXt/zTXt/iTXt or tIME after the IDATs, and I can't imagine
a hack like this ever becoming an approved part of the spec (or even
an extension to it).  Sounds a lot like what KDE/Qt did a few years
back, in fact.

Ralph wrote:

> Ah, so that's what happened. Has anyone worked out what they actually 
> have against MNG?

I think the ultimate argument was the lack of an experienced (Mozilla)
maintainer to take care of it; other issues were mentioned, but they
were largely refuted, and Mozilla drivers actually (conditionally)
reversed the removal at one point--whereupon the lack of a maintainer
became the final sticking point.(*)

But perhaps Stuart would care to present his viewpoint on either issue?

Greg

(*) Nevertheless, work on a clean and trimmed-down MNG extension (.xpi)
    has continued; Glenn can provide pointers, I suspect.

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