From: Juri Linkov <juri@linkov.net>
To: dalanicolai <dalanicolai@gmail.com>
Cc: Tomas Hlavaty <tom@logand.com>, Emacs Devel <emacs-devel@gnu.org>
Subject: Re: Multi image PDF continuous mode
Date: Sat, 08 Jan 2022 20:17:30 +0200 [thread overview]
Message-ID: <86o84m2ky5.fsf@mail.linkov.net> (raw)
In-Reply-To: <CACJP=3=z+0dBg0JeDqRY51WoqO9fxK+1D8oddaRyUWjFNdLOrA@mail.gmail.com> (dalanicolai@gmail.com's message of "Sat, 8 Jan 2022 08:11:50 +0100")
> I would like to share my perspective on this, but before I do that,
> let me first ask you if you have any idea about why pdf-tools is not part of
> Emacs. It is a very high quality package, that already lazily loads the images,
> and provides many sophisticated features.
It would be nice to include pdf-tools in Emacs, but I don't know
if the new maintainer has an intention to submit it for inclusion.
> You might already be familiar with my 2-buffer continuous scroll hack for it
> (which can be easily ported to doc-view mode, but 'developing' a 'real'
> continuous scroll mode solution makes much more sense
I agree, a real continuous scroll mode would be more preferable.
> - I have created a, very rude but already nicely working, 'real' continuous
> scroll proof of concept, for which, if you are interested, you can find the
> code in this commit. It currently uses a trick where it only uses two images
> at the time
While two-images approach could provide better optimization for memory,
it has severe limitations, e.g. the vertical scroll bar can't be used
to scroll all images at once.
> but as I will describe now, I think it will be better to create a
> 'bookroll' package for it.
This is a promising direction.
> I think the bookroll should not be so difficult to implement (I first started to
> think about a general 'image-roll', but I think continuous scrolling is
> generally not what you want for viewing/scrolling images
Why not? 'image-roll' could be useful for the image gallery packages
like image-dired.el and thumbs.el.
> So my current idea for how to implement it, is by
> immediately creating overlays for all pages in a single buffer and fill them
> with 'empty' svg-images of the correct size (after testing this with a thousand
> 'placeholders', it seems that the 'empty' images use almost no memory).
Good news, so loading a 1000-page document won't take much memory.
Only scrolling will load real images. Maybe then after a real image
will be scrolled out of view, it could be replaced with a placeholder again
to free memory.
> Then, the scrolling can be implemented, by changing the display properties (from empty
> svg to real image, and back) and jumping to the correct positions using
> `set-window-vscroll`. I have started on writing bookroll.el, of course your
> joined efforts or feedback would be very much appreciated. Otherwise, this short
> message serves just to inform you about these activities.
Thanks, feel free to post updates about your progress
or when stuck on some problems.
next prev parent reply other threads:[~2022-01-08 18:17 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-09 17:05 Multi image PDF continuous mode Juri Linkov
2021-12-09 19:24 ` Stefan Kangas
2021-12-09 19:35 ` Tomas Hlavaty
2021-12-09 20:05 ` Juri Linkov
2022-01-08 7:11 ` dalanicolai
2022-01-08 7:18 ` dalanicolai
2022-01-08 7:24 ` dalanicolai
2022-01-08 9:34 ` Stefan Kangas
2022-01-08 18:17 ` Juri Linkov [this message]
2022-01-08 21:32 ` dalanicolai
2022-01-10 8:13 ` Juri Linkov
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