|Subject:||Re: Suggestion / feature request|
|Date:||Thu, 19 Apr 2012 18:36:41 +0200|
|User-agent:||Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:188.8.131.52) Gecko/20120313 Lightning/1.0b2 Thunderbird/3.1.20|
Le 19/04/2012 16:17, Tassilo Horn a écrit :
Ummm I suppose I am a bit of a maniac I really feel unconfortable if I don't have the real pdf in front of me and can go back and forward to check the global aspect of the document ...Carlos Aguilar <address@hidden> writes: Hi Carlos,I often use doc-view mode with medium to large pdf/ps/dvi files, when writing/modifying latex documents.Yes, frequently changing documents are clearly not the prime use-case for doc-view, exactly because of the reasons you mention. Do you use AUCTeX for writing your documents? If yes, then preview-latex might be exactly what you need. ,----[ (info "(preview-latex)Top") ] | preview-latex is a package embedding preview fragments into Emacs | source buffers under the AUCTeX editing environment for LaTeX. It uses | `preview.sty' for the extraction of certain environments (most notably | displayed formulas). Other applications of this style file are | possible and exist. `----
Of course it must be MUCH cheaper.I wondered if it would be possible to keep a set of signatures of the pdf/ps/dvi pages processed so that those that are unchanged are not reconverted to (already existing) bitmap images.Um, I have no idea how to do that. Doc-view only knows the PNG images generated from the original document, and you can't compare those with pages in the document. Well, it also has the old document's contents in the current buffer and the updated document is on the file system, so in theory it could also compare the documents. But I have no clue how to do that. Googling around, I've found http://www.qtrac.eu/comparepdf.html, but I'm not sure if it does the trick. (Oh, and of course if the comparison of the docs is not significantly cheaper than a reconversion, there's no sense in doing so. ;-))
I have tried to use pdftk burst (which splits almost instantaneously a pdf file in a set of files with one page each) with two closely different versions of a large pdf. The idea was : if the pdf for each file is exactly the same when pages are unchanged just a checksum will do the test (and be very significantly cheaper than a reconversion).
The resulting pdf files are close for each page but different. Maybe there is a workaround with pdftk or directly with gs ... but before doing that the question is :
Would you change doc-view if it is possible to find a (simple enough) way to obtain the functionality I am talking about ? Or do you believe this is uninteresting/dangerous/outofscope ?
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