GNU bug report logs - #17944
24.3.92; pos-visible-in-window-p with PARTIALLY is wrong for a large image in a wrapped line

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: YAMAMOTO Mitsuharu <mituharu <at> math.s.chiba-u.ac.jp>
Subject: bug#17944: closed (Re: bug#17944: 24.3.92; pos-visible-in-window-p
 with PARTIALLY is wrong for a large image in	a wrapped line)
Date: Sat, 05 Jul 2014 09:58:03 +0000

[Message part 1 (text/plain, inline)]

Your bug report

#17944: 24.3.92; pos-visible-in-window-p with PARTIALLY is wrong for a large image in a wrapped line

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 17944 <at> debbugs.gnu.org.

-- 
17944: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=17944
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

[Message part 2 (message/rfc822, inline)]

From: Eli Zaretskii <eliz <at> gnu.org>
To: YAMAMOTO Mitsuharu <mituharu <at> math.s.chiba-u.ac.jp>
Cc: 17944-done <at> debbugs.gnu.org
Subject: Re: bug#17944: 24.3.92;
 pos-visible-in-window-p with PARTIALLY is wrong for a large image
 in	a wrapped line
Date: Sat, 05 Jul 2014 12:56:49 +0300

> Date: Sat, 05 Jul 2014 18:07:09 +0900
> From: YAMAMOTO Mitsuharu <mituharu <at> math.s.chiba-u.ac.jp>
> 
> 1. $ emacs -Q -D &
> 2. Type the following expression and hit C-j in the *scratch* buffer.
> 
>   (save-excursion
>     (goto-char (point-min))
>     (insert-image (create-image "splash.png")))
> 
> 3. M-:
>    (progn
>      (set-frame-width nil 20)
>      (set-frame-height nil 10)
>      (set-window-start nil (point-min))
>      (pos-visible-in-window-p (point-min) nil t))
>    RET
> 
> Result:
> 
> Returns (0 94 0 68 0 1) for me, whereas I expect 0 instead of 94 for
> the Y-coordinate value.  If I add (insert ?\n) after (insert-image
> ...) to avoid line wrapping, then the result becomes (160 0 0 68 120
> 0) where the Y-coordinate value is 0 as expected.

Fixed in revision 117354 on the emacs-24 branch.

[Message part 3 (message/rfc822, inline)]

From: YAMAMOTO Mitsuharu <mituharu <at> math.s.chiba-u.ac.jp>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.3.92;
 pos-visible-in-window-p with PARTIALLY is wrong for a large image in
 a wrapped line
Date: Sat, 05 Jul 2014 18:07:09 +0900

This is different from Bug#17942, which has just been fixed.

Steps to reproduce:

1. $ emacs -Q -D &
2. Type the following expression and hit C-j in the *scratch* buffer.

  (save-excursion
    (goto-char (point-min))
    (insert-image (create-image "splash.png")))

3. M-:
   (progn
     (set-frame-width nil 20)
     (set-frame-height nil 10)
     (set-window-start nil (point-min))
     (pos-visible-in-window-p (point-min) nil t))
   RET

Result:

Returns (0 94 0 68 0 1) for me, whereas I expect 0 instead of 94 for
the Y-coordinate value.  If I add (insert ?\n) after (insert-image
...) to avoid line wrapping, then the result becomes (160 0 0 68 120
0) where the Y-coordinate value is 0 as expected.

				     YAMAMOTO Mitsuharu
				mituharu <at> math.s.chiba-u.ac.jp

In GNU Emacs 24.3.92.1 (x86_64-apple-darwin13.2.0, GTK+ Version 3.12.2)
 of 2014-07-05 on YAMAMOTO-no-iMac.local
Repository revision: 117353 eliz <at> gnu.org-20140705082407-pa7h7dorji08yem5
Windowing system distributor `The X.Org Foundation', version 11.0.11406000
Configured using:
 `configure --without-imagemagick LDFLAGS=-L/opt/local/lib
 CPPFLAGS=-I/opt/local/include'

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