From 7d7520b969649d786dcb59f2a38cafee3846dbba Mon Sep 17 00:00:00 2001
From: Lars Magne Ingebrigtsen <larsi@gnus.org>
Date: Wed, 1 Sep 2010 23:53:57 +0000
Subject: gnus-html.el: Rescale images in article buffers for Emacs versions
 that support this.   This is currently only Emacs 24 compiled with
 imagemagick support.

---
 lisp/gnus/ChangeLog    |  3 +++
 lisp/gnus/gnus-html.el | 32 +++++++++++++++++++++++++++++++-
 2 files changed, 34 insertions(+), 1 deletion(-)

diff --git a/lisp/gnus/ChangeLog b/lisp/gnus/ChangeLog
index 884441db4b..711e7194d3 100644
--- a/lisp/gnus/ChangeLog
+++ b/lisp/gnus/ChangeLog
@@ -7,6 +7,9 @@
 2010-09-01  Lars Magne Ingebrigtsen  <larsi@gnus.org>
 
 	* gnus-html.el (gnus-html-wash-tags): Delete the IMG_ALT region.
+	(gnus-max-image-proportion): New variable.
+	(gnus-html-rescale-image): New function.
+	(gnus-html-put-image): Rescale images.
 
 2010-09-01  Stefan Monnier  <monnier@iro.umontreal.ca>
 
diff --git a/lisp/gnus/gnus-html.el b/lisp/gnus/gnus-html.el
index 2e44c3f560..a89a3f57ff 100644
--- a/lisp/gnus/gnus-html.el
+++ b/lisp/gnus/gnus-html.el
@@ -56,6 +56,16 @@
   :group 'gnus-art
   :type 'regexp)
 
+(defcustom gnus-max-image-proportion 0.7
+  "How big pictures displayed are in relation to the window they're in.
+A value of 0.7 means that they are allowed to take up 70% of the
+width and height of the window.  If they are larger than this,
+and Emacs supports it, then the images will be rescaled down to
+fit these criteria."
+  :version "24.1"
+  :group 'gnus-art
+  :type 'float)
+
 ;;;###autoload
 (defun gnus-article-html (handle)
   (let ((article-buffer (current-buffer)))
@@ -219,13 +229,33 @@
 			   (= (car (image-size image t)) 30)
 			   (= (cdr (image-size image t)) 30))))
 	    (progn
-	      (gnus-put-image image)
+	      (gnus-put-image (gnus-html-rescale-image image))
 	      t)
 	  (when (fboundp 'find-image)
 	    (gnus-put-image (find-image
 			     '((:type xpm :file "lock-broken.xpm")))))
 	  nil)))))
 
+(defun gnus-html-rescale-image (image)
+  (if (not (fboundp 'imagemagick-types))
+      image
+    (let* ((width (car (image-size image t)))
+	   (height (cdr (image-size image t)))
+	   (edges (window-pixel-edges))
+	   (window-width (truncate (* gnus-max-image-proportion
+				      (- (nth 2 edges) (nth 0 edges)))))
+	   (window-height (truncate (* gnus-max-image-proportion
+				       (- (nth 3 edges) (nth 1 edges)))))
+	   scaled-image)
+      (when (> width window-width)
+	(setq window-height (truncate (* window-height
+					 (/ (* 1.0 window-width) width)))))
+      (if (> height window-height)
+	  (or (create-image file 'imagemagick nil
+			    :height window-height)
+	      image)
+	image))))
+
 (defun gnus-html-prune-cache ()
   (let ((total-size 0)
 	files)
-- 
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