GNU bug report logs - #14567
Scrolling of large images

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From: Thomas Wiecki <thomas.wiecki <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 14567 <at> debbugs.gnu.org
Subject: bug#14567: Scrolling of large images
Date: Thu, 6 Jun 2013 13:16:43 -0400

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1. Download a large image (e.g.
http://cdn.urbanislandz.com/wp-content/uploads/2011/10/MMSposter-large.jpg)
and save it as /tmp/test.jpg
2. In an emacs buffer type "(insert-image (create-image "/tmp/test.jpg"))"
3. Type some arbitrary lines of text below this line.
4. In first line (containing insert-image), type C-x C-e at end of line to
load the image.
5. Image should appear in buffer.
6. Scroll down repeatedly until past the image.

Expected behavior: Scrolls down smoothly even once scrolled past image.
Observed behavior: Scrolls down smoothly until end of image is reached. At
end of image, the next scroll causes a huge jump in the window so that and
only the text is shown but not any of the residual image.

7. scroll back up

Expected behavior: Scrolls upwards over image.
Observed behavior: Jumps over complete image and shows beginning of buffer.

Please let me know if there is anything else you need.

Thanks,
Thomas



On Thu, Jun 6, 2013 at 12:42 PM, Eli Zaretskii <eliz <at> gnu.org> wrote:

> > From: Thomas Wiecki <thomas.wiecki <at> gmail.com>
> > Date: Thu, 6 Jun 2013 08:17:02 -0400
> >
> > The scrolling behavior of emacs when there are large images (larger than
> > the window height) in the buffer seems to broken. Specifically, down-ward
> > scrolling makes a huge jump over the image as the image is about to move
> > outside of the current view (it seems the image is treated as a single
> > line).
> >
> > image-mode is not applicable as there is text intermixed with images.
> >
> > This behavior and its implications are also discussed here:
> > https://github.com/tkf/emacs-ipython-notebook/issues/94
> > and here:
> > http://www.randomsample.de/dru5/node/25
> >
> > "slice-images" is a work-around solution but far from ideal.
> >
> > Any chance this could get fixed?
>
> Any chance to get a simple reproducible recipe, complete with images,
> which I could use to look into the problem locally?
>
> Thanks.
>

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