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, 2 insertions, 2 deletions

diff --git a/src/htmldocvisitor.cpp b/src/htmldocvisitor.cpp
index ebef0d4..c9567c5 100644
--- a/src/htmldocvisitor.cpp
+++ b/src/htmldocvisitor.cpp
@@ -2001,7 +2001,7 @@ void HtmlDocVisitor::writeMscFile(const QCString &fileName,
   }
   baseName.prepend("msc_");
   QCString outDir = Config_getString("HTML_OUTPUT");
-  QCString imgExt = Config_getEnum("DOT_IMAGE_FORMAT");
+  QCString imgExt = getDotImageExtension();
   MscOutputFormat mscFormat = MSC_BITMAP;
   if ("svg" == imgExt)
     mscFormat = MSC_SVG;
@@ -2045,7 +2045,7 @@ void HtmlDocVisitor::writePlantUMLFile(const QCString &fileName,
     baseName=baseName.left(i);
   }
   static QCString outDir = Config_getString("HTML_OUTPUT");
-  static QCString imgExt = Config_getEnum("DOT_IMAGE_FORMAT");
+  QCString imgExt = getDotImageExtension();
   if (imgExt=="svg")
   {
     generatePlantUMLOutput(fileName,outDir,PUML_SVG);