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Re: Image metadata

From: Stefan Monnier
Subject: Re: Image metadata
Date: Tue, 30 Mar 2010 21:22:16 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.50 (gnu/linux)

>>> The problem is that one part of the current `image-extension-data'
>>> is metadata, and another part is extension data.  For instance, in
>>> (count 44
>>> 255 "NETSCAPE2.0"
>>> 0 "address@hidden@"
>>> 249 "address@hidden"
>>> )
>>> `count 44' is metadata, and the rest (with non-descriptive numeric keys)
>>> is extension data.
>> Not knowing what is "extension data", I don't know if I agree.

> From the API's point of view, "extension data" is just raw data fetched
> from the `ExtensionBlocks' slot of the GIF metadata.  So really it's not
> important what it is as long as slot names basically coincide in the GIF
> structure and in its Lisp image metadata.

That still doesn't tell me what it is, other than that it's Gif-specific
and that it's a kind of metadata, so the name "extension-data" shouldn't
appear in the generic code.
I guess your patch is good, thanks, feel free to install it.


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