1 files changed, 9 insertions, 2 deletions
diff --git a/math/render.ml b/math/render.ml
index f070a91e..e9a21687 100644
--- a/math/render.ml
+++ b/math/render.ml
@@ -2,6 +2,10 @@ let cmd_dvips tmpprefix = "dvips -R -E " ^ tmpprefix ^ ".dvi -f >" ^ tmpprefix ^
 let cmd_latex tmpprefix = "latex " ^ tmpprefix ^ ".tex >/dev/null"
 (* Putting -transparent white in converts arguments will sort-of give you transperancy *)
 let cmd_convert tmpprefix finalpath = "convert -quality 100 -density 120 " ^ tmpprefix ^ ".ps " ^ finalpath ^ " >/dev/null 2>/dev/null"
+(* Putting -bg Transparent in dvipng's arguments will give full-alpha transparency *)
+(* Note that IE have problems with such PNGs and need an additional javascript snippet *)
+(* Putting -bg transparent in dvipng's arguments will give binary transparency *)
+let cmd_dvipng tmpprefix finalpath = "dvipng -gamma 1.5 -D 120 -T tight --strict " ^ tmpprefix ^ ".dvi -o " ^ finalpath ^ " >/dev/null 2>/dev/null"
 
 exception ExternalCommandFailure of string
 
@@ -15,7 +19,8 @@ let render tmppath finalpath outtex md5 =
 	Sys.remove (tmpprefix ^ ".aux");
 	Sys.remove (tmpprefix ^ ".log");
         Sys.remove (tmpprefix ^ ".tex");
-	Sys.remove (tmpprefix ^ ".ps");
+	if Sys.file_exists (tmpprefix ^ ".ps")
+	then Sys.remove (tmpprefix ^ ".ps");
       end in
     let f = (Util.open_out_unless_exists (tmpprefix ^ ".tex")) in
       begin
@@ -25,9 +30,11 @@ let render tmppath finalpath outtex md5 =
 	close_out f;
 	if Util.run_in_other_directory tmppath (cmd_latex tmpprefix0) != 0
 	then (unlink_all (); raise (ExternalCommandFailure "latex"))
-	else if (Sys.command (cmd_dvips tmpprefix) != 0)
+	else if (Sys.command (cmd_dvipng tmpprefix (finalpath^"/"^md5^".png")) != 0)
+	then (if (Sys.command (cmd_dvips tmpprefix) != 0)
 	then (unlink_all (); raise (ExternalCommandFailure "dvips"))
 	else if (Sys.command (cmd_convert tmpprefix (finalpath^"/"^md5^".png")) != 0)
 	then (unlink_all (); raise (ExternalCommandFailure "convert"))
+	else unlink_all ())
 	else unlink_all ()
       end