shr.el (shr-put-image-function): New variable.

 (shr-image-fetched, shr-image-displayer, shr-tag-img): Funcall it.
 (shr-put-image): Return scaled image.
gnus-art.el (gnus-shr-put-image): New function.
 (gnus-article-prepare-display): Bind shr-put-image-function to it.
gnus-html.el (gnus-html-wash-images): Register scaled images, not original ones, as deletable.

lisp/gnus/ChangeLog

+2011-05-10  Katsumi Yamaoka  <yamaoka@jpl.org>
+
+	* shr.el (shr-put-image-function): New variable.
+	(shr-image-fetched, shr-image-displayer, shr-tag-img): Funcall it.
+	(shr-put-image): Return scaled image.
+
+	* gnus-art.el (gnus-shr-put-image): New function.
+	(gnus-article-prepare-display): Bind shr-put-image-function to it.
+
+	* gnus-html.el (gnus-html-wash-images): Register scaled images, not
+	original ones, as deletable.
+
 2011-05-09  Stefan Monnier  <monnier@iro.umontreal.ca>
 	* nntp.el (nntp-open-connection): Set TCP keepalive option.

lisp/gnus/gnus-art.el

@@ -4656,6 +4656,8 @@ If ALL-HEADERS is non-nil, no headers are hidden."
 	    (gnus-run-hooks 'gnus-article-prepare-hook)
 	    t))))))
 
+(defvar shr-put-image-function)
+
 ;;;###autoload
 (defun gnus-article-prepare-display ()
   "Make the current buffer look like a nice article."
@@ -4669,6 +4671,7 @@ If ALL-HEADERS is non-nil, no headers are hidden."
     (setq buffer-read-only nil
 	  gnus-article-wash-types nil
 	  gnus-article-image-alist nil)
+    (set (make-local-variable 'shr-put-image-function) 'gnus-shr-put-image)
     (gnus-run-hooks 'gnus-tmp-internal-hook)
     (when gnus-display-mime-function
       (funcall gnus-display-mime-function))))
@@ -6139,6 +6142,15 @@ Provided for backwards compatibility."
 	     (not gnus-inhibit-hiding))
     (gnus-article-hide-headers)))
 
+(declare-function shr-put-image "shr" (data alt))
+
+(defun gnus-shr-put-image (data alt)
+  "Put image DATA with a string ALT.  Enable image to be deleted."
+  (let ((image (shr-put-image data (propertize (or alt "*")
+					       'gnus-image-category 'shr))))
+    (when image
+      (gnus-add-image 'shr image))))
+
 ;;; Article savers.
 
 (defun gnus-output-to-file (file-name)

lisp/gnus/gnus-html.el

@@ -215,16 +215,16 @@ CHARS is a regexp-like character alternative (e.g., \"[)$]\")."
 			     (mm-with-part handle (buffer-string))
 			     nil t))))
 	      (if image
-		  (progn
-		    (gnus-put-image
-		     (gnus-rescale-image
-		      image (gnus-html-maximum-image-size))
-		     (gnus-string-or (prog1
-					 (buffer-substring start end)
-				       (delete-region start end))
-				     "*")
-		     'cid)
-		    (gnus-add-image 'cid image))
+		  (gnus-add-image
+		   'cid
+		   (gnus-put-image
+		    (gnus-rescale-image
+		     image (gnus-html-maximum-image-size))
+		    (gnus-string-or (prog1
+					(buffer-substring start end)
+				      (delete-region start end))
+				    "*")
+		    'cid))
 		(widget-convert-button
 		 'link start end
 		 :action 'gnus-html-insert-image

lisp/gnus/shr.el

@@ -87,6 +87,9 @@ used."
 This is used for cid: URLs, and the function is called with the
 cid: URL as the argument.")
 
+(defvar shr-put-image-function 'shr-put-image
+  "Function called to put image and alt string.")
+
 (defface shr-strike-through '((t (:strike-through t)))
   "Font for <s> elements."
   :group 'shr)
@@ -500,10 +503,11 @@ redirects somewhere else."
 		  (inhibit-read-only t))
 	      (delete-region start end)
 	      (goto-char start)
-	      (shr-put-image data alt)))))))
+	      (funcall shr-put-image-function data alt)))))))
   (kill-buffer (current-buffer)))
 
 (defun shr-put-image (data alt)
+  "Put image DATA with a string ALT.  Return image."
   (if (display-graphic-p)
       (let ((image (ignore-errors
                      (shr-rescale-image data))))
@@ -513,7 +517,8 @@ redirects somewhere else."
 	  (when (and (> (current-column) 0)
 		     (> (car (image-size image t)) 400))
 	    (insert "\n"))
-	  (insert-image image (or alt "*"))))
+	  (insert-image image (or alt "*")))
+	image)
     (insert alt)))
 
 (defun shr-rescale-image (data)
@@ -576,8 +581,8 @@ START, and END.  Note that START and END should be merkers."
 				     (substring url (match-end 0)))))
 		 (when image
 		   (goto-char start)
-		   (shr-put-image image
-				  (buffer-substring-no-properties start end))
+		   (funcall shr-put-image-function
+			    image (buffer-substring-no-properties start end))
 		   (delete-region (point) end))))
 	 (url-retrieve url 'shr-image-fetched
 		       (list (current-buffer) start end)
@@ -864,7 +869,7 @@ ones, in case fg and bg are nil."
 	    (if (or (not shr-content-function)
 		    (not (setq image (funcall shr-content-function url))))
 		(insert alt)
-	      (shr-put-image image alt))))
+	      (funcall shr-put-image-function image alt))))
 	 ((or shr-inhibit-images
 	      (and shr-blocked-images
 		   (string-match shr-blocked-images url)))
@@ -874,7 +879,7 @@ ones, in case fg and bg are nil."
 		(shr-insert (truncate-string-to-width alt 8))
 	      (shr-insert alt))))
 	 ((url-is-cached (shr-encode-url url))
-	  (shr-put-image (shr-get-image-data url) alt))
+	  (funcall shr-put-image-function (shr-get-image-data url) alt))
 	 (t
 	  (insert alt)
 	  (funcall