I have taken a look at render.ml and have written a patch that will enable the use of the PNG-rendering program dvipng. This would reduce load on the server, and also enable full-alpha transparency (but I havent included that yet, IE has problems with full-alpha PNGs).
There is already a patch somewhere, but in this attempt I have tried to make sure that the old dvips->convert renderer is used in the case dvipng fails (or indeed, is not present on the system). Unfortunately I do not have a server to test it on. Does anyone want to try it?
The patch is small, so I suppose there is no real harm in including it here.
/Jan-Åke
Index: render.ml =================================================================== --- render.ml (revision 16007) +++ render.ml (working copy) @@ -2,6 +2,10 @@ 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
@@ -25,9 +29,11 @@ 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