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Can I avoid using `clear-image-cache'?

From: Mathias Dahl
Subject: Can I avoid using `clear-image-cache'?
Date: Fri, 06 May 2005 11:27:15 +0200
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/21.3.50 (windows-nt)

I am currently developing a little package, tumme.el, to browse images
in Emacs. It is similar to thumbs.el but quite different too.

I have code that inserts thumbnail versions of images into a buffer,
like this:

  (defun tumme-ins-img (file original-file-name
    "Insert thumbnail image."
    (let (beg end tags
              (i `(image :type ,'jpeg
                         :file ,file
                         :relief ,tumme-thumb-relief
                         :margin ,tumme-thumb-margin)))
      (setq beg (point))
      (insert-image i)
      (setq end (point))
       beg end
       (list 'original-file-name original-file-name
             'associated-dired-buffer associated-dired-buffer
             'tags (tumme-list-tags original-file-name)))))

The problem is that if I rotate the thumbnail image (using the tools
from ImageMagick), removes and inserts the image again, the image is
fetched from Emacs' image cache. Therefor I need to clear the cache
using `clear-image-cache' so that it loads the file from disk.

Now, I know that this can be done in other ways. For example
`insert-image-file' does not have this problem as it puts the image
bytes into the text properties, while they way I use `insert-image'
will insert the file name. I probably can change the code to work the
way `insert-image-file' does, but I would rather like to, in some way,
be able to flush one particular image from the image cache.

Can this be done or do I need to write a more advanced piece of code?

For now I will use `clear-image-cache' although it feels "ugly".


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