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-rw-r--r--doc/bugs/Problems_with_graphviz.pm_plug-in.mdwn28
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+The graphviz.pm plug-in currently attempts to read PNG data in UTF-8 mode, which sometimes fail with a message similar to the following (depending on the input):
+
+ utf8 "\x89" does not map to Unicode at /usr/local/lib/perl5/site_perl/5.8.8/IkiWiki/Plugin/graphviz.pm line 53, <IN> chunk 1.
+ Wide character in subroutine entry at /usr/local/lib/perl5/site_perl/5.8.8/IkiWiki/Plugin/graphviz.pm line 68.
+
+It also generates image URLs relative to the page being rendered, which means the URLs wont work when previewing a graph from the CGI script.
+
+The patch below fixes these two issues.
+
+ --- graphviz.pm.orig Thu Jun 7 15:45:16 2007
+ +++ graphviz.pm Thu Jun 7 15:52:27 2007
+ @@ -41,7 +41,6 @@ sub render_graph (\%) { #{{{
+ $pid=open2(*IN, *OUT, "$params{prog} -Tpng");
+
+ # open2 doesn't respect "use open ':utf8'"
+ - binmode (IN, ':utf8');
+ binmode (OUT, ':utf8');
+
+ print OUT $src;
+ @@ -70,7 +69,7 @@ sub render_graph (\%) { #{{{
+ }
+ }
+
+ - return "<img src=\"".urlto($dest, $params{page})."\" />\n";
+ + return "<img src=\"".urlto($dest, "/")."\" />\n";
+ } #}}}
+
+ sub graph (@) { #{{{ \ No newline at end of file