[WWcvs] webwork-modperl: Moves configuration of gif2png and friends to

[jj v. a. <we...@ma...>]

Log Message:
-----------
Moves configuration of gif2png and friends to global.conf.  Individual
paths, and/or arguments to the conversion statements can be adjusted.

To make use of this change, update global.conf and pg/macros/dangerousmacros.pl
This should close bug 813.  At some time, the scripts should be removed
from the bin directory.

Modified Files:
--------------
    webwork-modperl/conf:
        global.conf.dist

Revision Data
-------------
Index: global.conf.dist
===================================================================
RCS file: /webwork/cvs/system/webwork-modperl/conf/global.conf.dist,v
retrieving revision 1.127
retrieving revision 1.128
diff -Lconf/global.conf.dist -Lconf/global.conf.dist -u -r1.127 -r1.128
--- conf/global.conf.dist
+++ conf/global.conf.dist
@@ -59,6 +59,29 @@
 
 $externalPrograms{tar}      = "/usr/bin/tar";
 
+# Basic image manipulation utilities
+#  Most sites only need to configure the first line
+$externalPrograms{netpbm} = "/usr/bin/"; # Really a prefix, rather than a program
+$externalPrograms{giftopnm} = $externalPrograms{netpbm}.'giftopnm';
+$externalPrograms{ppmtopgm} = $externalPrograms{netpbm}.'ppmtopgm';
+$externalPrograms{pnmtops}  = $externalPrograms{netpbm}.'pnmtops';
+$externalPrograms{pnmtopng} = $externalPrograms{netpbm}.'pnmtopng';
+$externalPrograms{pngtopnm} = $externalPrograms{netpbm}.'pngtopnm';
+
+# The following lines are the external scripts gif2eps, etc.
+#   The source file is input with cat, and the output is redirected to
+#   the desired file.
+
+$externalPrograms{gif2eps} = "$externalPrograms{giftopnm} | $externalPrograms{ppmtopgm}| $externalPrograms{pnmtops} -noturn 2>/dev/null";
+$externalPrograms{png2eps}  = "$externalPrograms{pngtopnm} | $externalPrograms{ppmtopgm} | $externalPrograms{pnmtops} -noturn 2>/dev/null";
+$externalPrograms{gif2png}  = "$externalPrograms{giftopnm} | $externalPrograms{pnmtopng}";
+
+# Note on these conversions:
+# we used to use `pnmdepth 1' instead of ppmtopgm as it creates a
+# monochrome image (1 bit) rather than a greyscale image (8 bits).
+# However, this was causing improper display of some sort in PDFs.
+
+
 ################################################################################
 # Mail settings
 ################################################################################
@@ -389,15 +412,6 @@
 $courseFiles{logs}{login_log}       = "$courseDirs{logs}/login.log";
 
 ################################################################################
-# More paths to external programs 
-################################################################################
-
-# These image conversion utilities are included in the WeBWorK distribution.
-$externalPrograms{gif2eps}  = "$webworkDirs{bin}/gif2eps";
-$externalPrograms{png2eps}  = "$webworkDirs{bin}/png2eps";
-$externalPrograms{gif2png}  = "$webworkDirs{bin}/gif2png";
-
-################################################################################
 # Site defaults (FIXME: what other things could be "site defaults"?)
 ################################################################################