* doc-view.el (doc-view-image-width): New variable.

(doc-view-enlarge, doc-view-insert-image): Prefer imagemagick
backend for PNG images, and do dynamic rescaling instead of
reconverting the whole doc.

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index b24eae7b4e86c0a749ee1392e8f1c16db1de5106..be65508a115b1af3018633386d1251d70086507f 100644 (file)
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,10 @@
+2011-01-05  Tassilo Horn  <tassilo@member.fsf.org>
+
+       * doc-view.el (doc-view-image-width): New variable.
+       (doc-view-enlarge, doc-view-insert-image): Prefer imagemagick
+       backend for PNG images, and do dynamic rescaling instead of
+       reconverting the whole doc.
+
 2011-01-05  Glenn Morris  <rgm@gnu.org>
 
        * emacs-lisp/rx.el (rx-repeat): Replace CL function.

diff --git a/lisp/doc-view.el b/lisp/doc-view.el
index 801cddd16202ea844943880855e17b042ad8fb7d..7ec8b3954e06a9e8346d0ce0731c2cf719243e9e 100644 (file)
--- a/lisp/doc-view.el
+++ b/lisp/doc-view.el
@@ -168,6 +168,12 @@ Higher values result in larger images."
   :type 'number
   :group 'doc-view)
 
+(defcustom doc-view-image-width 850
+  "Default image width.
+Has only an effect if imagemagick support is compiled into emacs."
+  :type 'number
+  :group 'doc-view)
+
 (defcustom doc-view-dvipdfm-program (executable-find "dvipdfm")
   "Program to convert DVI files to PDF.
 
@@ -641,9 +647,17 @@ OpenDocument format)."
 (defun doc-view-enlarge (factor)
   "Enlarge the document."
   (interactive (list doc-view-shrink-factor))
-  (set (make-local-variable 'doc-view-resolution)
-       (* factor doc-view-resolution))
-  (doc-view-reconvert-doc))
+  (if (eq (plist-get (cdr (doc-view-current-image)) :type)
+         'imagemagick)
+      ;; ImageMagick supports on-the-fly-rescaling
+      (progn
+       (set (make-local-variable 'doc-view-image-width)
+            (ceiling (* factor doc-view-image-width)))
+       (doc-view-insert-image (plist-get (cdr (doc-view-current-image)) :file)
+                              :width doc-view-resolution))
+    (set (make-local-variable 'doc-view-resolution)
+        (ceiling (* factor doc-view-resolution)))
+    (doc-view-reconvert-doc)))
 
 (defun doc-view-shrink (factor)
   "Shrink the document."
@@ -949,7 +963,11 @@ ARGS is a list of image descriptors."
     (setq doc-view-pending-cache-flush nil))
   (let ((ol (doc-view-current-overlay))
         (image (if (and file (file-readable-p file))
-                   (apply 'create-image file 'png nil args)))
+                  (if (not (fboundp 'imagemagick-types))
+                      (apply 'create-image file 'png nil args)
+                    (unless (member :width args)
+                      (setq args (append args (list :width doc-view-image-width))))
+                    (apply 'create-image file 'imagemagick nil args))))
         (slice (doc-view-current-slice)))
     (setf (doc-view-current-image) image)
     (move-overlay ol (point-min) (point-max))