https://bugzilla.wikimedia.org/show_bug.cgi?id=31775

--- Comment #6 from Vitaliy Filippov <[email protected]> 2011-10-27 21:22:55 
UTC ---
(In reply to comment #5)
> The page rotation looks like it requires patching third-party programs -- this
> would seem to mean that it won't work with a default poppler-utils install, 
> and
> would make deploying it a lot harder.

I've sent a bug to poppler's bugtracker:
https://bugs.freedesktop.org/show_bug.cgi?id=41867
Hope the patch will be included some day. :)

> There are a bunch of introductions of register_globals vulnerabilities -- do
> not want. :)

Oops, thank you very much! I've understood at last, why so much extensions
disallow setting parameters before inclusion... =) although register_globals is
off on every "self-respecting" web server :)

> I'm a bit unsure what this multiple-thumbnail thing is for; it's not even
> mentioned in your descriptions. Not sure if this is a desirable thing, and if
> it is I'm not sure how much difficulty it would cause with compatibility.
> Thumbnails are rendered via a 404 handler on major installs like Wikimedia, 
> and
> we need consistent naming that's understood on the back and front end; this 
> may
> not work with that.

For example, insert all slides of a presentation to a wiki page...
I agree it's a sort of specific feature.

> What's the benefits of the direct rendering from ImageMagick? Are there any
> reasons that wasn't done in the first place, such as file size, memory usage,
> etc?

Increased performance, reduced memory usage and no temp file problems.
What about temp files: we've had an issue when handling some PDFs (I can find
an example if you want) - gs was creating several ~1Gb files on /tmp and then
crashing. So /tmp became full some day :)
And all gs-based pdf viewers suffer - opening such PDFs takes ~4 min on modern 
hardware :) at the same time, Adobe Reader displays them normally.
The problem exists mostly when these PDFs are rendered with high DPI setting.
So when using imagemagick, you must lower this setting to solve the problem,
but this also affects the quality of other images.

> What does "Thumbnails now link to correct individual pages of PDF." actually
> mean?

This means [[File:Something.pdf|page=2]] will link to
/wiki/File:Something.pdf?page=2 - not just /wiki/File:Something.pdf

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