(doc-view-convert-current-doc): Save the current

resolution in the cache directory.
(doc-view-initiate-display): Restore the saved resolution when
using cached image files.

2 files changed, 25 insertions, 0 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 5f9a617aa44..1b00c6f0fdc 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,10 @@
+2009-03-05  Tassilo Horn  <tassilo@member.fsf.org>
+
+        * doc-view.el (doc-view-convert-current-doc): Save the current
+        resolution in the cache directory.
+        (doc-view-initiate-display): Restore the saved resolution when
+        using cached image files.
+
 2009-03-05  Glenn Morris  <rgm@gnu.org>
 
         * mail/rmail.el (rmail-perm-variables): rmail-overlay-list needs to be
diff --git a/lisp/doc-view.el b/lisp/doc-view.el
index c9ad392a0b7..bfdc40d50b0 100644
--- a/lisp/doc-view.el
+++ b/lisp/doc-view.el
@@ -721,8 +721,16 @@ Those files are saved in the directory given by the function
   ;; resets during the redisplay).
   (setq doc-view-pending-cache-flush t)
   (let ((png-file (expand-file-name "page-%d.png"
+                                    (doc-view-current-cache-dir)))
+        (res-file (expand-file-name "resolution.el"
                                     (doc-view-current-cache-dir))))
     (make-directory (doc-view-current-cache-dir) t)
+    ;; Save the used resolution so that it can be restored when
+    ;; reading the cached files.
+    (let ((res doc-view-resolution))
+      (with-temp-buffer
+        (princ res (current-buffer))
+        (write-file res-file)))
     (case doc-view-doc-type
       (dvi
        ;; DVI files have to be converted to PDF before Ghostscript can process
@@ -1045,6 +1053,16 @@ If BACKWARD is non-nil, jump to the previous match."
         (if (doc-view-already-converted-p)
             (progn
               (message "DocView: using cached files!")
+              ;; Load the saved resolution
+              (let ((res-file (expand-file-name "resolution.el"
+                                                (doc-view-current-cache-dir)))
+                    (res doc-view-resolution))
+                (with-temp-buffer
+                  (when (file-exists-p res-file)
+                    (insert-file-contents res-file)
+                    (setq res (read (current-buffer)))))
+                (when (numberp res)
+                  (set (make-local-variable 'doc-view-resolution) res)))
               (doc-view-display (current-buffer) 'force))
           (doc-view-convert-current-doc))
         (message