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Re: [PATCH] Delayed loading of image libraries


From: David Kastrup
Subject: Re: [PATCH] Delayed loading of image libraries
Date: 02 Jul 2004 09:10:55 +0200
User-agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.3.50

Juanma Barranquero <address@hidden> writes:

> On Fri, 02 Jul 2004 10:16:03 +0900
> Miles Bader <address@hidden> wrote:
> 
> > Previously, the value returned by `create-image' was a valid
> > image, which could be displayed, even if saved to a file and read
> > back in a new emacs session.  After your change for windows, this
> > was not true any longer.
> 
> Why?  In which way would it be different from the previous
> situation, where you could make a PNG image, say, save it, and load
> it on an Emacs *not* supporting PNG?

In that we are not talking about an Emacs not supporting PNG.  It is
fine if an Emacs not supporting PNG does not display a PNG.  It is
not fine if an Emacs supporting PNG does not display a PNG.

> After loading, Emacs *must* ask at a moment or other whether the
> image type is available, mustn't it?

How about when displaying it?

> So, at what moment is the loaded image used, and why
> `image-type-available-p' has not been called at that point?

Why should image-type-available-p have been called?

-- 
David Kastrup, Kriemhildstr. 15, 44793 Bochum




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