org.el: Fix XEmacs compatibility bug when creating images.

* org.el (org-create-formula-image, org-dvipng-color): Fix
XEmacs compatibility bug.

TINYCHANGE

Thanks to Uwe Brauer for this patch.

lisp/org.el

@@ -16988,7 +16988,7 @@ inspection."
 	 (dvifile (concat texfilebase ".dvi"))
 	 (pngfile (concat texfilebase ".png"))
 	 (fnh (if (featurep 'xemacs)
-                  (font-height (get-face-font 'default))
+                  (font-height (face-font 'default))
                 (face-attribute 'default :height nil)))
 	 (scale (or (plist-get options (if buffer :scale :html-scale)) 1.0))
 	 (dpi (number-to-string (* scale (floor (* 0.9 (if buffer fnh 140.))))))
@@ -17017,13 +17017,19 @@ inspection."
     (if (not (file-exists-p dvifile))
 	(progn (message "Failed to create dvi file from %s" texfile) nil)
       (condition-case nil
-	  (call-process "dvipng" nil nil nil
+	  (if (featurep 'xemacs)
+	      	  (call-process "dvipng" nil nil nil
 			"-fg" fg "-bg" bg
-			"-D" dpi
-			;;"-x" scale "-y" scale
 			"-T" "tight"
 			"-o" pngfile
 			dvifile)
+	    (call-process "dvipng" nil nil nil
+			  "-fg" fg "-bg" bg
+			  "-D" dpi
+			  ;;"-x" scale "-y" scale
+			  "-T" "tight"
+			  "-o" pngfile
+			  dvifile))
 	(error nil))
       (if (not (file-exists-p pngfile))
 	  (if org-format-latex-signal-error
@@ -17099,7 +17105,12 @@ SNIPPETS-P indicates if this is run to create snippet images for HTML."
   "Return an rgb color specification for dvipng."
   (apply 'format "rgb %s %s %s"
 	 (mapcar 'org-normalize-color
-		 (color-values (face-attribute 'default attr nil)))))
+		 (if (featurep 'xemacs)
+		     (color-rgb-components
+		      (face-property 'default
+				     (cond ((eq attr :foreground) 'foreground)
+					   ((eq attr :background) 'background))))
+		   (color-values (face-attribute 'default attr nil))))))
 
 (defun org-normalize-color (value)
   "Return string to be used as color value for an RGB component."