Support generating index-color PNG files

Based on the request http://stackoverflow.com/questions/27036474/how-do-make-doxygen-generate-index-color-png-files for index colored png files, this functionality will be included in the newer versions (2.39) of dot.
The functionality -Tpng:cairo:gd will automatically be used by doxygen, though the file extension would be wrong (.png:cairo:gd).
With this patch the :cairo:gd is stripped from the image extension, but not from the -T of the dot command.
In the doxywizard the different possibilities are supplied as well. Note however that the DOT_IMAGE_FORMAT name is not checked when read from the Doxyfile so it is possible to use other renderer / formats as well due to the generic solution with getDot ImageExtension.

1 files changed, 6 insertions, 0 deletions

diff --git a/src/util.cpp b/src/util.cpp
index 83f65a4..108bdc4 100644
--- a/src/util.cpp
+++ b/src/util.cpp
@@ -8371,3 +8371,9 @@ bool mainPageHasTitle()
   return TRUE;
 }
 
+QCString getDotImageExtension(void)
+{
+  QCString imgExt      = Config_getEnum("DOT_IMAGE_FORMAT");
+  imgExt = imgExt.replace( QRegExp(":.*"), "" );
+  return imgExt;
+}