Make shr feed Content-Type to the image-creating libraries

This finally makes it possible to display icons.

* net/eww.el (eww-display-image): Ditto.

* net/shr.el (shr-parse-image-data): New function to grab both the
data itself and the Content-Type.
(shr-put-image): Use it.

3 files changed, 35 insertions, 10 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index c6f11fec11a..17648f6a540 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,5 +1,11 @@
 2013-08-13  Lars Magne Ingebrigtsen  <larsi@gnus.org>
 
+	* net/shr.el (shr-parse-image-data): New function to grab both the
+	data itself and the Content-Type.
+	(shr-put-image): Use it.
+
+	* net/eww.el (eww-display-image): Ditto.
+
 	* image.el (image-content-type-suffixes): New variable.
 
 2013-08-13  Fabián Ezequiel Gallina  <fgallina@gnu.org>
diff --git a/lisp/net/eww.el b/lisp/net/eww.el
index a689ff2ae9f..34934a03549 100644
--- a/lisp/net/eww.el
+++ b/lisp/net/eww.el
@@ -304,7 +304,7 @@ word(s) will be searched for via `eww-search-prefix'."
     (goto-char (point-min))))
 
 (defun eww-display-image ()
-  (let ((data (buffer-substring (point) (point-max))))
+  (let ((data (shr-parse-image-data)))
     (eww-setup-buffer)
     (let ((inhibit-read-only t))
       (shr-put-image data nil))
diff --git a/lisp/net/shr.el b/lisp/net/shr.el
index bc454292360..ed47c502e11 100644
--- a/lisp/net/shr.el
+++ b/lisp/net/shr.el
@@ -705,7 +705,7 @@ If EXTERNAL, browse the URL using `shr-external-browser'."
       (url-store-in-cache image-buffer)
       (when (or (search-forward "\n\n" nil t)
 		(search-forward "\r\n\r\n" nil t))
-	(let ((data (buffer-substring (point) (point-max))))
+	(let ((data (shr-parse-image-data)))
 	  (with-current-buffer buffer
 	    (save-excursion
 	      (let ((alt (buffer-substring start end))
@@ -732,20 +732,28 @@ If EXTERNAL, browse the URL using `shr-external-browser'."
 	(setq payload (base64-decode-string payload)))
       payload)))
 
-(defun shr-put-image (data alt &optional flags)
-  "Put image DATA with a string ALT.  Return image."
+(defun shr-put-image (spec alt &optional flags)
+  "Insert image SPEC with a string ALT.  Return image.
+SPEC is either an image data blob, or a list where the first
+element is the data blob and the second element is the content-type."
   (if (display-graphic-p)
       (let* ((size (cdr (assq 'size flags)))
+	     (data (if (consp spec)
+		       (car spec)
+		     spec))
+	     (content-type (and (consp spec)
+				(cadr spec)))
 	     (start (point))
 	     (image (cond
 		     ((eq size 'original)
-		      (create-image data nil t :ascent 100))
+		      (create-image data nil t :ascent 100
+				    :content-type content-type))
 		     ((eq size 'full)
 		      (ignore-errors
-			(shr-rescale-image data t)))
+			(shr-rescale-image data t content-type)))
 		     (t
 		      (ignore-errors
-			(shr-rescale-image data))))))
+			(shr-rescale-image data nil content-type))))))
         (when image
 	  ;; When inserting big-ish pictures, put them at the
 	  ;; beginning of the line.
@@ -767,7 +775,7 @@ If EXTERNAL, browse the URL using `shr-external-browser'."
 	image)
     (insert alt)))
 
-(defun shr-rescale-image (data &optional force)
+(defun shr-rescale-image (data &optional force content-type)
   "Rescale DATA, if too big, to fit the current buffer.
 If FORCE, rescale the image anyway."
   (if (or (not (fboundp 'imagemagick-types))
@@ -782,7 +790,8 @@ If FORCE, rescale the image anyway."
        :max-width (truncate (* shr-max-image-proportion
 			       (- (nth 2 edges) (nth 0 edges))))
        :max-height (truncate (* shr-max-image-proportion
-				(- (nth 3 edges) (nth 1 edges))))))))
+				(- (nth 3 edges) (nth 1 edges))))
+       :content-type content-type))))
 
 ;; url-cache-extract autoloads url-cache.
 (declare-function url-cache-create-filename "url-cache" (url))
@@ -799,7 +808,17 @@ Return a string with image data."
 	    t)
       (when (or (search-forward "\n\n" nil t)
 		(search-forward "\r\n\r\n" nil t))
-	(buffer-substring (point) (point-max))))))
+	(shr-parse-image-data)))))
+
+(defun shr-parse-image-data ()
+  (list
+   (buffer-substring (point) (point-max))
+   (save-excursion
+     (save-restriction
+       (narrow-to-region (point-min) (point))
+       (let ((content-type (mail-fetch-field "content-type")))
+	 (and content-type
+	      (intern content-type obarray)))))))
 
 (defun shr-image-displayer (content-function)
   "Return a function to display an image.