bug#21239: 25.0.50; `(image-size image 'pixels)` is causing Emacs to freeze on OSX Snow Leopard.

bug#21239: 25.0.50; `(image-size image 'pixels)` is causing Emacs to freeze on OSX Snow Leopard.

[Keith David Bershatsky]

When the variable `doc-view-scale-internally' is set to `t` in `doc-view-mode', Emacs tries to calculate `displayed-img-width', which looks like this:

(car (image-size '(image :type imagemagick :file "/Users/HOME/Desktop/page-1.png" :pointer arrow :width 850) 'pixels))

The image size can be calculated without 'pixels, but adding 'pixels to the equation causes Emacs to freeze -- every time -- on OSX Snow Leopard 10.6.8.

It is necessary at that point to force quit Emacs -- i.e., not even C-g can unfreeze Emacs which displays the spinning circle for the mouse pointer.

Thanks,

Keith

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

In GNU Emacs 25.0.50.1 (x86_64-apple-darwin10.8.0, NS appkit-1038.36 Version 10.6.8 (Build 10K549))
 of 2015-08-04 on server.local
Repository revision: 118363 mina86@mina86.com-20141117204835-paxrwolqd1cgwtdp
Windowing system distributor `Apple', version 10.3.1038
Configured using:
 `configure --with-ns'

Configured features:
IMAGEMAGICK ACL LIBXML2 ZLIB

Important settings:
  locale-coding-system: utf-8-unix

Major mode: FM

Minor modes in effect:
  tb-mode: t
  sb-mode: t
  ml-mode: t
  ds-mode: t
  sd-mode: t
  bc-mode: t

Recent messages:
Wrote /Users/HOME/.0.data/.0.emacs/.lock
Emacs:  (car (image-size '(image :type imagemagi . . . [2 times]

Load-path shadows:
None found.

Features:
(shadow emacsbug sendmail lawlist-ztree lawlist-yas lawlist-ws
lawlist-wl elmo-imap4 elmo-localdir modb-standard modb-legacy
elmo-internal elmo-flag mmelmo-imap mmelmo-buffer elsp-generic mel-u
ps-print ps-def lpr parse-time disp-table enriched lawlist-w3m
browse-url doc-view image-mode ccl lawlist-window lawlist-vl
lawlist-view lawlist-undo lawlist-txt lawlist-tm lawlist-tex compare-w
lawlist-tabbar lawlist-speedbar lawlist-sgml lawlist-sb
lawlist-saveplace lawlist-ruler mule-util lawlist-replace
lawlist-rectangle lawlist-re-builder lawlist-python skeleton
lawlist-profiler lawlist-print lawlist-php lawlist-perl lawlist-parens
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org-pcomplete org-list org-faces org-entities org-version
ob-emacs-lisp ob ob-tangle ob-ref ob-lob ob-table ob-exp org-src
ob-keys ob-comint ob-core ob-eval org-compat org-macs org-loaddefs
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lawlist-movement lawlist-mouse lawlist-ml lawlist-minibuffer
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lawlist-lorem lawlist-ln lawlist-keymap lawlist-js lawlist-ispell
lawlist-isearch lawlist-imenu lawlist-ibuffer lawlist-hl lawlist-grep
lawlist-git ido view vc-git vc vc-dispatcher url-http tls url
url-proxy url-privacy url-expand url-methods url-history mailcap
url-auth url-cookie url-domsuf url-gw thingatpt time-stamp server
log-view log-edit message mml mml-sec mm-decode mm-bodies mm-encode
gmm-utils mailheader pcvs-util add-log lawlist-help quail help-mode
json grep compile find-lisp ediff-merg ediff-wind ediff-diff
ediff-mult ediff-help ediff-init ediff-util ediff ert find-func ewoc
debug eieio-base diff-mode conf-mode autorevert filenotify
lawlist-frame lawlist-frame-bufs lawlist-font-lock lawlist-fm
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bytecomp byte-compile cl-extra cconv eieio-core password-cache
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cocoa ns multi-tty emacs)

Memory information:
((conses 16 1968786 136680)
 (symbols 48 80381 0)
 (miscs 40 131 202)
 (strings 32 179551 28304)
 (string-bytes 1 6480231)
 (vectors 16 37618)
 (vector-slots 8 911420 13879)
 (floats 8 1935 322)
 (intervals 56 334 0)
 (buffers 976 11))

bug#21239: 25.0.50; `(image-size image 'pixels)` is causing Emacs to freeze on OSX Snow Leopard.

[Keith David Bershatsky]

This is a follow-up.  Apparently the problem is more broad-spread than originally thought.

I am not even able to open a raw xpm file in `image-mode' using the August 4, 2015 Emacs Trunk on OSX Snow Leopard without it freezing (requiring a force quit).

I've gone back to a much older version of Emacs Trunk and will put a note on my to-do list to do some more debugging.

If anyone has some ideas why the current version of Emacs Trunk built --with-ns cannot support `image-mode' on OSX Snow Leopard, I think that is related to the inability to use `doc-view-scale-internally' set to `t` in `doc-view-mode'.

Keith

bug#21239: 25.0.50; `(image-size image 'pixels)` is causing Emacs to freeze on OSX Snow Leopard.

[Keith David Bershatsky]

Additional follow-up:

In the older version of Emacs Trunk from last year, the test `(fboundp 'imagemagick-types)' is `nil'.  In the Emacs Trunk  from August 4, 2015, the same test is `t`.

The section of code from `doc-view-insert-image` tests for both `doc-view-scale-internally' AND `(fboundp 'imagemagick-types)'.

So, while it seemed that the culprit was `doc-view-scale-internally', it is actually how Emacs behaves in `image-mode' and `doc-view-mode' when `(fboundp 'imagemagick-types)' is `t`.

Setting `imagemagick-types-inhibit' to `t' seems to fixe the problem with displaying a raw xpm in `image-mode'` in a buffer all by itself; and, adding an additional test to `doc-view-insert-image' of `(not (eq imagemagick-types-inhibit t))' is one way to get Emacs to stop freezing.

bug#21239: 25.0.50; `(image-size image 'pixels)` is causing Emacs to freeze on OSX Snow Leopard.

[Lars Ingebrigtsen]

Keith David Bershatsky <esq@lawlist.com> writes:

> In the older version of Emacs Trunk from last year, the test `(fboundp
> 'imagemagick-types)' is `nil'.  In the Emacs Trunk from August 4,
> 2015, the same test is `t`.
>
> The section of code from `doc-view-insert-image` tests for both
> `doc-view-scale-internally' AND `(fboundp 'imagemagick-types)'.

This wasn't followed up at the time, but I think it's likely that this
problem has gone away in Emacs 27 (at least).  Emacs now builds without
ImageMagick by default, and does scaling natively.  So I'm closing this
bug report -- if this is still a problem, please reopen.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no