[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: doc-view.el --- View PDF/PostScript/DVI files in Emacs
From: |
David Kastrup |
Subject: |
Re: doc-view.el --- View PDF/PostScript/DVI files in Emacs |
Date: |
Mon, 27 Aug 2007 12:23:48 +0200 |
User-agent: |
Gnus/5.11 (Gnus v5.11) Emacs/22.1.50 (gnu/linux) |
Tassilo Horn <address@hidden> writes:
> David Kastrup <address@hidden> writes:
>
> Hi David,
>
>>>>> I changed doc-view.el so that it uses plain ghostscript (plus
>>>>> dvipdfm for DVI files) which gives good results and is about ten
>>>>> times faster than with ImageMagick's convert.
>>>>>
>>>>> The only downside is that I don't know how to cut off the margins.
>>>>> Those waste a lot of buffer space when displaying the image.
>>>>> converts -trim option was very nice for that cause. Do you know
>>>>> how one can do that with ghostview?
>>>>
>>>> Well, that is one of the things done in preview-latex. Do you have
>>>> the bounding box information for your images (preview-latex takes
>>>> them from TeX usually)?
>>>
>>> No, how should I get it? I only have PDF/PS or DVI files with no
>>> sources at all.
>>
>> I am afraid I can't figure out what you are trying to achieve.
>
> Well, when doc-view.el used `convert' I supplied the -trim option to
> it. This option cuts off the margins by calculating a mimimum
> bounding rectangle around the contents whose outside has background
> color and cuts the outside away.
Sure. I just think that this is the wrong thing to do for page previews.
>> PDF/PS and DVI files are primarily page-oriented formats. It does not
>> make sense to display every page with a different size.
>
> I don't agree here. IMO it wastes too much screen estate to display
> the margins. When those were cut off I could split my emacs frame
> horizontally and view a PDF doc in one window and have another
> 80-columns window for work.
>
> Now that's not possible anymore because the images contain those
> huge margins. The only solution is to make the images smaller but
> that makes them hard to read. And I cannot scroll-left to center
> the image. Even `C-u 1 C-x <' scrolls too much.
That is an argument for giving better scrolling/margining behavior to
Emacs (you _do_ realize that Emacs can display partial images?). So
you can add an option for selecting a page area you want to see,
possibly by dragging a rectangle across the image, and then get a
_consistent_ display of margins across your whole document.
>> PDF and PS files can actually change the page format in midstream
>> _if_ that is desired. Autocropping will complicate the user's
>> handling of page material. This is different if we are talking
>> about embedded material, graphics and stuff. In that case, we will
>> be using PDF (which sets its own page size) or EPS. EPS files
>> carry a bounding box comment: extracting that and using it for
>> setting the rendering bounding box for Ghostscript should do the
>> trick.
>>
>> preview-extract-bb in AUCTeX's preview.el can be used for that
>> purpose.
>
> Yes, but for other files like PDF or DVI that seems not possible.
DVI needs to get converted to PostScript, anyway, doesn't it?
> Currently I don't really see how preview.el could be useful for
> doc-view. Ok, maybe I could display the first pages before the
> conversion of the rest has finished, but with ghostview conversion
> is so fast that I don't see any benefit that would justify to make
> the code more complex.
>
> For example doc-view on my practicalcommonlisp.pdf which has 528
> pages takes about one minute. And even this has to be done only one
> time...
preview-latex renders the page you are looking at in a fraction of a
second, even when we are talking about documents with a thousand
pages. Out of order rendering vastly increases the interactive
response.
> So please give some concrete examples how I could enhance
> doc-view.el with preview.el.
Shrug. If you don't consider sub-second response times as opposed to
minute delays an enhancement, I am out of my depth guessing what would
qualify as one.
So I am afraid I can't offer anything useful to you.
--
David Kastrup
- doc-view.el --- View PDF/PostScript/DVI files in Emacs, Tassilo Horn, 2007/08/24
- Re: doc-view.el --- View PDF/PostScript/DVI files in Emacs, Michaƫl Cadilhac, 2007/08/24
- Re: doc-view.el --- View PDF/PostScript/DVI files in Emacs, Tassilo Horn, 2007/08/24
- Re: doc-view.el --- View PDF/PostScript/DVI files in Emacs, David Kastrup, 2007/08/24
- Re: doc-view.el --- View PDF/PostScript/DVI files in Emacs, Tassilo Horn, 2007/08/25
- Re: doc-view.el --- View PDF/PostScript/DVI files in Emacs, David Kastrup, 2007/08/25
- Re: doc-view.el --- View PDF/PostScript/DVI files in Emacs, Tassilo Horn, 2007/08/26
- Re: doc-view.el --- View PDF/PostScript/DVI files in Emacs, David Kastrup, 2007/08/27
- Re: doc-view.el --- View PDF/PostScript/DVI files in Emacs, Tassilo Horn, 2007/08/27
- Re: doc-view.el --- View PDF/PostScript/DVI files in Emacs,
David Kastrup <=
- Re: doc-view.el --- View PDF/PostScript/DVI files in Emacs, Tassilo Horn, 2007/08/27
- Re: doc-view.el --- View PDF/PostScript/DVI files in Emacs, David Kastrup, 2007/08/27
- Re: doc-view.el --- View PDF/PostScript/DVI files in Emacs, Tassilo Horn, 2007/08/27
- Re: doc-view.el --- View PDF/PostScript/DVI files in Emacs, David Kastrup, 2007/08/27
- Re: doc-view.el --- View PDF/PostScript/DVI files in Emacs, Tassilo Horn, 2007/08/28
- Re: doc-view.el --- View PDF/PostScript/DVI files in Emacs, Stefan Monnier, 2007/08/27
- Re: doc-view.el --- View PDF/PostScript/DVI files in Emacs, David Kastrup, 2007/08/27
- Re: doc-view.el --- View PDF/PostScript/DVI files in Emacs, Stefan Monnier, 2007/08/28
- Re: doc-view.el --- View PDF/PostScript/DVI files in Emacs, Richard Stallman, 2007/08/28
- Re: doc-view.el --- View PDF/PostScript/DVI files in Emacs, David O'Toole, 2007/08/28