From: David Kastrup <dak@gnu.org>
Cc: emacs-devel@gnu.org, Mathias Dahl <brakjoller@gmail.com>
Subject: Re: thumbs.el and transparency
Date: Sun, 29 Jan 2006 19:13:09 +0100 [thread overview]
Message-ID: <85bqxu52dm.fsf@lola.goethe.zz> (raw)
In-Reply-To: <fc339e4a0601290838o4943407ay@mail.gmail.com> (Miles Bader's message of "Mon, 30 Jan 2006 01:38:45 +0900")
Miles Bader <miles@gnu.org> writes:
> 2006/1/29, Mathias Dahl <brakjoller@gmail.com>:
>> Such a command would need to check how many images the directory
>> contains and warn the user if the number of files exeeds a certain,
>> configurable, limit (say 50 or something like that as default).
>
> How hard would it be to have it do the thumb-ification in the
> background, so that it wouldn't really matter if there were many image
> files (the user would see them being added, and could use those that
> were available)? This is the way many image browsing programs work,
> and it's a very nice way of dealing with the delay of
> thumb-conversion.
I'd like to mention how preview-latex does this sort of background
rendering in order to have it least offensive: it keeps a queue of
images that still may have to be processed. Then it uses a
conditional display property (the importance is not the condition,
which needs to evaluate to t, but the side effect from evaluating the
condition) for showing on-screen stuff first with the help of the
following two functions:
(defun preview-add-urgentization (fun ov &rest rest)
"Cause FUN (function call form) to be called when redisplayed.
FUN must be a form with OV as first argument,
REST as the remainder, returning T."
(let ((dispro (overlay-get ov 'display)))
(unless (eq (car dispro) 'when)
(overlay-put ov 'display `(when (,fun ,ov ,@rest) . ,dispro)))))
(defun preview-remove-urgentization (ov)
"Undo urgentization of OV by `preview-add-urgentization'.
Returns the old arguments to `preview-add-urgentization'
if there was any urgentization."
(let ((dispro (overlay-get ov 'display)))
(when (eq (car dispro) 'when)
(prog1
(car (cdr dispro))
(overlay-put ov 'display (cdr (cdr dispro)))))))
(this is in preview/prv-emacs.el, since the variant for XEmacs looks
quite different).
This is used as
(preview-add-urgentization #'preview-gs-urgentize ov run-buffer)
when the overlay is pushed into preview-gs-queue.
preview-gs-urgentize then does the following:
(defun preview-gs-urgentize (ov buff)
"Make a displayed overlay render with higher priority.
This function is used in fake conditional display properties
for reordering the conversion order to prioritize on-screen
images. OV is the overlay in question, and BUFF is the
Ghostscript process buffer where the buffer-local queue
is located."
;; It does not matter that ov gets queued twice in that process: the
;; first version to get rendered will clear the 'queued property.
;; It cannot get queued more than twice since we remove the
;; conditional display property responsible for requeuing here.
;; We don't requeue if the overlay has been killed (its buffer made
;; nil). Not necessary, but while we are checking...
;; We must return t.
(preview-remove-urgentization ov)
(when (and (overlay-get ov 'queued)
(overlay-buffer ov))
(with-current-buffer buff
(push ov preview-gs-queue)))
t)
Ok, the net effect is that stuff that is on-screen will get pushed to
the front of the queue. That means when moving around in the buffer,
first the on-screen stuff gets done, afterwards the non-visible stuff
gets done in background.
I think this would be a reasonable way of proceeding with large
directory listings, too.
If it is any help: those parts are written by myself and a part of
AUCTeX for which I have assigned papers.
--
David Kastrup, Kriemhildstr. 15, 44793 Bochum
next prev parent reply other threads:[~2006-01-29 18:13 UTC|newest]
Thread overview: 127+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-01-25 1:08 thumbs.el and transparency Nick Roberts
2006-01-25 7:59 ` Juri Linkov
2006-01-25 9:20 ` Nick Roberts
2006-01-26 18:54 ` Mathias Dahl
2006-01-26 21:59 ` Nick Roberts
2006-01-27 3:46 ` Miles Bader
2006-01-27 9:27 ` Nick Roberts
2006-01-28 4:50 ` Richard M. Stallman
2006-01-28 23:58 ` Nick Roberts
2006-01-29 13:41 ` Mathias Dahl
2006-01-29 21:10 ` Nick Roberts
2006-01-29 22:42 ` Mathias Dahl
2006-01-30 10:26 ` Kim F. Storm
2006-01-30 11:23 ` Juanma Barranquero
2006-01-30 15:12 ` Chong Yidong
2006-01-30 15:41 ` Juanma Barranquero
2006-01-30 18:43 ` Chong Yidong
2006-01-31 15:31 ` CUA-related problem (was: Re: thumbs.el and transparency) Kim F. Storm
2006-01-31 15:41 ` Juanma Barranquero
2006-01-31 18:19 ` Luc Teirlinck
2006-01-31 19:32 ` Juanma Barranquero
2006-01-31 18:04 ` thumbs.el and transparency Richard M. Stallman
2006-01-31 19:47 ` Juanma Barranquero
2006-01-31 21:10 ` Luc Teirlinck
2006-01-31 23:08 ` Kim F. Storm
2006-01-31 23:45 ` Luc Teirlinck
2006-02-01 10:41 ` Kim F. Storm
2006-02-02 2:07 ` Luc Teirlinck
2006-02-02 9:26 ` Juanma Barranquero
2006-02-02 9:35 ` Kim F. Storm
2006-01-31 23:54 ` Luc Teirlinck
2006-02-01 10:45 ` Juanma Barranquero
2006-01-30 23:25 ` Richard M. Stallman
2006-01-31 9:26 ` Juanma Barranquero
2006-01-29 9:38 ` Sascha Wilde
2006-01-29 13:46 ` Mathias Dahl
2006-01-29 16:38 ` Miles Bader
2006-01-29 18:13 ` David Kastrup [this message]
2006-01-29 22:35 ` Mathias Dahl
2006-01-29 16:50 ` David Kastrup
2006-01-29 22:33 ` Mathias Dahl
2006-01-27 16:53 ` Mathias Dahl
2006-01-29 0:03 ` Nick Roberts
2006-01-30 0:56 ` Richard M. Stallman
2006-01-30 11:35 ` Mathias Dahl
2006-01-29 2:33 ` Miles Bader
2006-01-29 14:07 ` Mathias Dahl
2006-01-29 14:34 ` Mathias Dahl
2006-01-29 16:22 ` Robert J. Chassell
2006-01-29 18:01 ` Chong Yidong
2006-01-29 20:13 ` Nick Roberts
2006-01-30 1:04 ` Robert J. Chassell
2006-01-30 2:08 ` Nick Roberts
2006-01-30 14:44 ` Robert J. Chassell
2006-01-29 22:04 ` Mathias Dahl
2006-01-29 23:13 ` Chong Yidong
2006-01-30 11:57 ` Mathias Dahl
2006-01-30 14:18 ` Mathias Dahl
2006-01-30 1:49 ` Robert J. Chassell
2006-01-30 12:08 ` Mathias Dahl
2006-01-28 4:51 ` Richard M. Stallman
2006-01-29 16:01 ` Mathias Dahl
2006-01-30 18:46 ` Richard M. Stallman
2006-01-30 21:49 ` Mathias Dahl
2006-01-30 22:16 ` Mathias Dahl
2006-01-31 18:03 ` Richard M. Stallman
2006-02-01 10:44 ` Mathias Dahl
2006-02-02 4:16 ` Richard M. Stallman
2006-02-02 16:34 ` Mathias Dahl
2006-02-04 18:27 ` Richard M. Stallman
2006-02-05 12:03 ` Mathias Dahl
2006-02-05 20:36 ` Juri Linkov
2006-02-05 22:05 ` Mathias Dahl
2006-02-06 0:22 ` Miles Bader
2006-02-06 7:27 ` Juri Linkov
2006-02-06 17:37 ` Mathias Dahl
2006-02-07 10:59 ` Juri Linkov
2006-02-07 17:46 ` Mathias Dahl
2006-02-08 9:17 ` Juri Linkov
2006-02-08 15:27 ` Mathias Dahl
2006-02-09 17:29 ` Juri Linkov
2006-02-09 22:46 ` Mathias Dahl
2006-02-10 1:29 ` Juri Linkov
2006-02-10 10:14 ` Mathias Dahl
2006-02-10 10:28 ` Miles Bader
2006-02-10 13:45 ` tumme testing Robert J. Chassell
2006-02-10 14:26 ` Mattis
2006-02-10 18:18 ` Robert J. Chassell
2006-02-11 0:17 ` Mattis
2006-02-11 12:57 ` Robert J. Chassell
2006-02-11 21:54 ` Mathias Dahl
2006-02-11 1:22 ` Juri Linkov
2006-02-11 9:21 ` Mathias Dahl
2006-02-12 17:45 ` Juri Linkov
2006-02-12 21:21 ` Mathias Dahl
2006-02-12 23:41 ` Mathias Dahl
2006-02-13 0:24 ` Robert J. Chassell
2006-02-13 17:55 ` Juri Linkov
2006-02-13 18:41 ` Drew Adams
2006-02-14 6:18 ` Tomas Zerolo
2006-02-14 17:45 ` Juri Linkov
2006-02-13 20:21 ` Mathias Dahl
2006-02-10 16:47 ` Mathias Dahl
2006-02-11 16:45 ` thumbs.el and transparency Richard M. Stallman
2006-02-09 23:47 ` Miles Bader
2006-02-10 10:12 ` Mathias Dahl
2006-02-10 23:02 ` Richard M. Stallman
2006-02-10 23:56 ` Mathias Dahl
2006-02-11 1:21 ` Juri Linkov
2006-02-11 9:30 ` Mathias Dahl
2006-02-12 17:45 ` Juri Linkov
2006-02-12 18:35 ` Mathias Dahl
2006-02-12 4:30 ` Richard M. Stallman
2006-02-12 14:38 ` Mattis
2006-02-12 17:47 ` Juri Linkov
2006-02-12 18:39 ` Mathias Dahl
2006-02-13 17:57 ` Juri Linkov
2006-02-06 2:06 ` Richard M. Stallman
2006-02-06 21:19 ` Can someone verify my changes to tumme and dired? (was: thumbs.el and transparency) Mathias Dahl
2006-02-06 22:17 ` Can someone verify my changes to tumme and dired? Mathias Dahl
2006-02-06 23:33 ` David Kastrup
2006-02-07 12:58 ` Mathias Dahl
2006-01-27 4:12 ` thumbs.el and transparency Miles Bader
2006-01-27 4:50 ` Nick Roberts
-- strict thread matches above, loose matches on Subject: below --
2006-01-29 13:57 Xavier Maillard
2006-01-29 20:14 ` Nick Roberts
2006-01-29 22:11 ` Mathias Dahl
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