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.

50 files changed, 105 insertions, 70 deletions

diff --git a/src/config.xml b/src/config.xml
index 438b885..b6f1936 100644
--- a/src/config.xml
+++ b/src/config.xml
@@ -3271,7 +3271,9 @@ to be found in the default search path.
       <docs>
 <![CDATA[
  The \c DOT_IMAGE_FORMAT tag can be used to set the image format of the images
- generated by \c dot.
+ generated by \c dot. For an explanation of the image formats see the section output formats
+ in the documentation of the \c dot tool
+ (<a href="http://www.graphviz.org/">Graphviz</a>).
  \note If you choose \c svg you need to set 
  \ref cfg_html_file_extension "HTML_FILE_EXTENSION" to \c xhtml in order to make the SVG files
  visible in IE 9+ (other browsers do not have this requirement).
@@ -3281,6 +3283,14 @@ to be found in the default search path.
       <value name='jpg'/>
       <value name='gif'/>
       <value name='svg'/>
+      <value name='png:gd'/>
+      <value name='png:gd:gd'/>
+      <value name='png:cairo'/>
+      <value name='png:cairo:gd'/>
+      <value name='png:cairo:cairo'/>
+      <value name='png:cairo:gdiplus'/>
+      <value name='png:gdiplus'/>
+      <value name='png:gdiplus:gdiplus'/>
     </option>
     <option type='bool' id='INTERACTIVE_SVG' defval='0' depends='HAVE_DOT'>
       <docs>
diff --git a/src/docbookvisitor.cpp b/src/docbookvisitor.cpp
index 29b3ea5..929ca42 100644
--- a/src/docbookvisitor.cpp
+++ b/src/docbookvisitor.cpp
@@ -1350,7 +1350,7 @@ void DocbookDocVisitor::startDotFile(const QCString &fileName,
   }
   baseName.prepend("dot_");
   QCString outDir = Config_getString("DOCBOOK_OUTPUT");
-  QCString imgExt = Config_getEnum("DOT_IMAGE_FORMAT");
+  QCString imgExt = getDotImageExtension();
   writeDotGraphFromFile(fileName,outDir,baseName,GOF_BITMAP);
   m_t << "<para>" << endl;
   visitPreStart(m_t, hasCaption, baseName + "." + imgExt,  width,  height);
diff --git a/src/dot.cpp b/src/dot.cpp
index 1182e8d..e5825af 100644
--- a/src/dot.cpp
+++ b/src/dot.cpp
@@ -659,7 +659,8 @@ static bool writeSVGFigureLink(FTextStream &out,const QCString &relPath,
 // support the PNG format, we need to check the result.
 static void checkDotResult(const QCString &imgName)
 {
-  if (Config_getEnum("DOT_IMAGE_FORMAT")=="png")
+  QCString imgExt = getDotImageExtension();
+  if (imgExt=="png")
   {
     FILE *f = portable_fopen(imgName,"rb");
     if (f)
@@ -2273,7 +2274,8 @@ void DotGfxHierarchyTable::createGraph(DotNode *n,FTextStream &out,
 {
   QDir d(path);
   QCString baseName;
-  QCString imgExt = Config_getEnum("DOT_IMAGE_FORMAT");
+  QCString imgExt = getDotImageExtension();
+  QCString imgFmt = Config_getEnum("DOT_IMAGE_FORMAT");
   baseName.sprintf("inherit_graph_%d",id);
   QCString imgName = baseName+"."+ imgExt;
   QCString mapName = baseName+".map";
@@ -2323,7 +2325,7 @@ void DotGfxHierarchyTable::createGraph(DotNode *n,FTextStream &out,
     resetReNumbering();
 
     DotRunner *dotRun = new DotRunner(dotName,d.absPath().data(),TRUE,absImgName);
-    dotRun->addJob(imgExt,absImgName);
+    dotRun->addJob(imgFmt,absImgName);
     dotRun->addJob(MAP_CMD,absMapName);
     DotManager::instance()->addRun(dotRun);
   }
@@ -3128,7 +3130,8 @@ QCString DotClassGraph::writeGraph(FTextStream &out,
   baseName = convertNameToFile(diskName());
 
   // derive target file names from baseName
-  QCString imgExt = Config_getEnum("DOT_IMAGE_FORMAT");
+  QCString imgExt = getDotImageExtension();
+  QCString imgFmt = Config_getEnum("DOT_IMAGE_FORMAT");
   QCString absBaseName = d.absPath().utf8()+"/"+baseName;
   QCString absDotName  = absBaseName+".dot";
   QCString absMapName  = absBaseName+".map";
@@ -3156,7 +3159,7 @@ QCString DotClassGraph::writeGraph(FTextStream &out,
     {
       DotRunner *dotRun = new DotRunner(absDotName,
                               d.absPath().data(),TRUE,absImgName);
-      dotRun->addJob(imgExt,absImgName);
+      dotRun->addJob(imgFmt,absImgName);
       if (generateImageMap) dotRun->addJob(MAP_CMD,absMapName);
       DotManager::instance()->addRun(dotRun);
 
@@ -3484,7 +3487,8 @@ QCString DotInclDepGraph::writeGraph(FTextStream &out,
   QCString mapName=escapeCharsInString(m_startNode->m_label,FALSE);
   if (m_inverse) mapName+="dep";
 
-  QCString imgExt = Config_getEnum("DOT_IMAGE_FORMAT");
+  QCString imgExt = getDotImageExtension();
+  QCString imgFmt = Config_getEnum("DOT_IMAGE_FORMAT");
   QCString absBaseName = d.absPath().utf8()+"/"+baseName;
   QCString absDotName  = absBaseName+".dot";
   QCString absMapName  = absBaseName+".map";
@@ -3512,7 +3516,7 @@ QCString DotInclDepGraph::writeGraph(FTextStream &out,
     {
       // run dot to create a bitmap image
       DotRunner *dotRun = new DotRunner(absDotName,d.absPath().data(),TRUE,absImgName);
-      dotRun->addJob(imgExt,absImgName);
+      dotRun->addJob(imgFmt,absImgName);
       if (generateImageMap) dotRun->addJob(MAP_CMD,absMapName);
       DotManager::instance()->addRun(dotRun);
     }
@@ -3796,7 +3800,8 @@ QCString DotCallGraph::writeGraph(FTextStream &out, GraphOutputFormat graphForma
   QCString baseName = m_diskName + (m_inverse ? "_icgraph" : "_cgraph");
   QCString mapName  = baseName;
 
-  QCString imgExt = Config_getEnum("DOT_IMAGE_FORMAT");
+  QCString imgExt = getDotImageExtension();
+  QCString imgFmt = Config_getEnum("DOT_IMAGE_FORMAT");
   QCString absBaseName = d.absPath().utf8()+"/"+baseName;
   QCString absDotName  = absBaseName+".dot";
   QCString absMapName  = absBaseName+".map";
@@ -3824,7 +3829,7 @@ QCString DotCallGraph::writeGraph(FTextStream &out, GraphOutputFormat graphForma
     {
       // run dot to create a bitmap image
       DotRunner *dotRun = new DotRunner(absDotName,d.absPath().data(),TRUE,absImgName);
-      dotRun->addJob(imgExt,absImgName);
+      dotRun->addJob(imgFmt,absImgName);
       if (generateImageMap) dotRun->addJob(MAP_CMD,absMapName);
       DotManager::instance()->addRun(dotRun);
 
@@ -3950,7 +3955,8 @@ QCString DotDirDeps::writeGraph(FTextStream &out,
   QCString baseName=m_dir->getOutputFileBase()+"_dep";
   QCString mapName=escapeCharsInString(baseName,FALSE);
 
-  QCString imgExt = Config_getEnum("DOT_IMAGE_FORMAT");
+  QCString imgExt = getDotImageExtension();
+  QCString imgFmt = Config_getEnum("DOT_IMAGE_FORMAT");
   QCString absBaseName = d.absPath().utf8()+"/"+baseName;
   QCString absDotName  = absBaseName+".dot";
   QCString absMapName  = absBaseName+".map";
@@ -3988,7 +3994,7 @@ QCString DotDirDeps::writeGraph(FTextStream &out,
     {
       // run dot to create a bitmap image
       DotRunner *dotRun = new DotRunner(absDotName,d.absPath().data(),TRUE,absImgName);
-      dotRun->addJob(imgExt,absImgName);
+      dotRun->addJob(imgFmt,absImgName);
       if (generateImageMap) dotRun->addJob(MAP_CMD,absMapName);
       DotManager::instance()->addRun(dotRun);
     }
@@ -4113,7 +4119,8 @@ void generateGraphLegend(const char *path)
   MD5SigToString(md5_sig,sigStr.rawData(),33);
   QCString absBaseName = (QCString)path+"/graph_legend";
   QCString absDotName  = absBaseName+".dot";
-  QCString imgExt      = Config_getEnum("DOT_IMAGE_FORMAT");
+  QCString imgExt = getDotImageExtension();
+  QCString imgFmt = Config_getEnum("DOT_IMAGE_FORMAT");
   QCString imgName     = "graph_legend."+imgExt;
   QCString absImgName  = absBaseName+"."+imgExt;
   if (checkAndUpdateMd5Signature(absBaseName,sigStr) ||
@@ -4133,7 +4140,7 @@ void generateGraphLegend(const char *path)
     // run dot to generate the a bitmap image from the graph
 
     DotRunner *dotRun = new DotRunner(absDotName,d.absPath().data(),TRUE,absImgName);
-    dotRun->addJob(imgExt,absImgName);
+    dotRun->addJob(imgFmt,absImgName);
     DotManager::instance()->addRun(dotRun);
   }
   else
@@ -4161,14 +4168,15 @@ void writeDotGraphFromFile(const char *inFile,const char *outDir,
     err("Output dir %s does not exist!\n",outDir); exit(1);
   }
 
-  QCString imgExt = Config_getEnum("DOT_IMAGE_FORMAT");
+  QCString imgExt = getDotImageExtension();
+  QCString imgFmt = Config_getEnum("DOT_IMAGE_FORMAT");
   QCString imgName = (QCString)outFile+"."+imgExt;
   QCString absImgName = d.absPath().utf8()+"/"+imgName;
   QCString absOutFile = d.absPath().utf8()+"/"+outFile;
 
   DotRunner dotRun(inFile,d.absPath().data(),FALSE,absImgName);
   if (format==GOF_BITMAP)
-    dotRun.addJob(imgExt,absImgName);
+    dotRun.addJob(imgFmt,absImgName);
   else // format==GOF_EPS
   {
     if (Config_getBool("USE_PDFLATEX"))
@@ -4216,7 +4224,8 @@ void writeDotImageMapFromFile(FTextStream &t,
   }
 
   QCString mapName = baseName+".map";
-  QCString imgExt = Config_getEnum("DOT_IMAGE_FORMAT");
+  QCString imgExt = getDotImageExtension();
+  QCString imgFmt = Config_getEnum("DOT_IMAGE_FORMAT");
   QCString imgName = baseName+"."+imgExt;
   QCString absOutFile = d.absPath().utf8()+"/"+mapName;
 
@@ -4511,7 +4520,8 @@ QCString DotGroupCollaboration::writeGraph( FTextStream &t,
   QCString sigStr(33);
   MD5Buffer((const unsigned char *)theGraph.data(),theGraph.length(),md5_sig);
   MD5SigToString(md5_sig,sigStr.rawData(),33);
-  QCString imgExt      = Config_getEnum("DOT_IMAGE_FORMAT");
+  QCString imgExt = getDotImageExtension();
+  QCString imgFmt = Config_getEnum("DOT_IMAGE_FORMAT");
   QCString baseName    = m_diskName;
   QCString imgName     = baseName+"."+imgExt;
   QCString absPath     = d.absPath().data();
@@ -4541,7 +4551,7 @@ QCString DotGroupCollaboration::writeGraph( FTextStream &t,
     if (graphFormat==GOF_BITMAP) // run dot to create a bitmap image
     {
       DotRunner *dotRun = new DotRunner(absDotName,d.absPath().data(),FALSE);
-      dotRun->addJob(imgExt,absImgName);
+      dotRun->addJob(imgFmt,absImgName);
       if (writeImageMap) dotRun->addJob(MAP_CMD,absMapName);
       DotManager::instance()->addRun(dotRun);
 
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);
diff --git a/src/index.cpp b/src/index.cpp
index e448094..59f0b90 100644
--- a/src/index.cpp
+++ b/src/index.cpp
@@ -3266,7 +3266,8 @@ void writeGraphInfo(OutputList &ol)
   QCString legendDocs = theTranslator->trLegendDocs();
   int s = legendDocs.find("<center>");
   int e = legendDocs.find("</center>");
-  if (Config_getEnum("DOT_IMAGE_FORMAT")=="svg" && s!=-1 && e!=-1)
+  QCString imgExt = getDotImageExtension();
+  if (imgExt=="svg" && s!=-1 && e!=-1)
   {
     legendDocs = legendDocs.left(s+8) + "[!-- SVG 0 --]\n" + legendDocs.mid(e); 
     //printf("legendDocs=%s\n",legendDocs.data());
diff --git a/src/rtfdocvisitor.cpp b/src/rtfdocvisitor.cpp
index 20fbf53..7c7f607 100644
--- a/src/rtfdocvisitor.cpp
+++ b/src/rtfdocvisitor.cpp
@@ -1676,7 +1676,8 @@ void RTFDocVisitor::writeDotFile(const QCString &fileName)
   m_t << "{" << endl;
   m_t << rtf_Style_Reset;
   m_t << "\\pard \\qc {\\field\\flddirty {\\*\\fldinst INCLUDEPICTURE \"";
-  m_t << baseName << "." << Config_getEnum("DOT_IMAGE_FORMAT");
+  QCString imgExt = getDotImageExtension();
+  m_t << baseName << "." << imgExt;
   m_t << "\" \\\\d \\\\*MERGEFORMAT}{\\fldrslt IMAGE}}\\par" << endl;
   m_t << "}" << endl;
   m_lastIsPara=TRUE;
diff --git a/src/rtfgen.cpp b/src/rtfgen.cpp
index 3f09eec..e0d5631 100644
--- a/src/rtfgen.cpp
+++ b/src/rtfgen.cpp
@@ -2435,7 +2435,8 @@ void RTFGenerator::endDotGraph(const DotClassGraph &g)
   t << "{" << endl;
   t << rtf_Style_Reset << endl;
   t << "\\par\\pard \\qc {\\field\\flddirty {\\*\\fldinst INCLUDEPICTURE \"";
-  t << fn << "." << Config_getEnum("DOT_IMAGE_FORMAT");
+  QCString imgExt = getDotImageExtension();
+  t << fn << "." << imgExt;
   t << "\" \\\\d \\\\*MERGEFORMAT}{\\fldrslt IMAGE}}\\par" << endl;
   t << "}" << endl;
   newParagraph();
@@ -2458,7 +2459,8 @@ void RTFGenerator::endInclDepGraph(const DotInclDepGraph &g)
   t << "{" << endl;
   t << rtf_Style_Reset << endl;
   t << "\\par\\pard \\qc {\\field\\flddirty {\\*\\fldinst INCLUDEPICTURE \"";
-  t << fn << "." << Config_getEnum("DOT_IMAGE_FORMAT");
+  QCString imgExt = getDotImageExtension();
+  t << fn << "." << imgExt;
   t << "\" \\\\d \\\\*MERGEFORMAT}{\\fldrslt IMAGE}}\\par" << endl;
   t << "}" << endl;
   DBG_RTF(t << "{\\comment (endInclDepGraph)}"    << endl)
@@ -2488,7 +2490,8 @@ void RTFGenerator::endCallGraph(const DotCallGraph &g)
   t << "{" << endl;
   t << rtf_Style_Reset << endl;
   t << "\\par\\pard \\qc {\\field\\flddirty {\\*\\fldinst INCLUDEPICTURE \"";
-  t << fn << "." << Config_getEnum("DOT_IMAGE_FORMAT");
+  QCString imgExt = getDotImageExtension();
+  t << fn << "." << imgExt;
   t << "\" \\\\d \\\\*MERGEFORMAT}{\\fldrslt IMAGE}}\\par" << endl;
   t << "}" << endl;
   DBG_RTF(t << "{\\comment (endCallGraph)}"    << endl)
@@ -2510,7 +2513,8 @@ void RTFGenerator::endDirDepGraph(const DotDirDeps &g)
   t << "{" << endl;
   t << rtf_Style_Reset << endl;
   t << "\\par\\pard \\qc {\\field\\flddirty {\\*\\fldinst INCLUDEPICTURE \"";
-  t << fn << "." << Config_getEnum("DOT_IMAGE_FORMAT");
+  QCString imgExt = getDotImageExtension();
+  t << fn << "." << imgExt;
   t << "\" \\\\d \\\\*MERGEFORMAT}{\\fldrslt IMAGE}}\\par" << endl;
   t << "}" << endl;
   DBG_RTF(t << "{\\comment (endDirDepGraph)}"    << endl)
diff --git a/src/translator_am.h b/src/translator_am.h
index 9eaba0e..f44b23d 100644
--- a/src/translator_am.h
+++ b/src/translator_am.h
@@ -994,7 +994,7 @@ class TranslatorArmenian : public TranslatorAdapter_1_8_0
         "};\n"

         "\\endcode\n"

         "Սրանով կստանանք հետևյալ գրաֆը."

-        "<p><center><img src=\"graph_legend."+Config_getEnum("DOT_IMAGE_FORMAT")+"\"></center>\n"

+        "<p><center><img src=\"graph_legend."+getDotImageExtension()+"\"></center>\n"

         "<p>\n"

         "Այս գրաֆի ուղղանկյունները ունեն հետևյալ իմաստը.\n"

         "<ul>\n"

diff --git a/src/translator_ar.h b/src/translator_ar.h
index 5d37b69..0feb3f5 100644
--- a/src/translator_ar.h
+++ b/src/translator_ar.h
@@ -1044,7 +1044,7 @@ class TranslatorArabic : public TranslatorAdapter_1_4_6
         "\\endcode\n"
         "If the \\c MAX_DOT_GRAPH_HEIGHT tag in the configuration file "
         "is set to 240 this will result in the following graph:"
-        "<p><center><img alt=\"\" src=\"graph_legend."+Config_getEnum("DOT_IMAGE_FORMAT")+"\"></center>\n"
+        "<p><center><img alt=\"\" src=\"graph_legend."+getDotImageExtension()+"\"></center>\n"
         "<p>\n"
         "The boxes in the above graph have the following meaning:\n"
         "<ul>\n"
diff --git a/src/translator_br.h b/src/translator_br.h
index b7bd604..ac28e86 100644
--- a/src/translator_br.h
+++ b/src/translator_br.h
@@ -1007,7 +1007,7 @@ class TranslatorBrazilian : public Translator
         "};\n"
         "\\endcode\n"
         "Isto irá gerar o seguinte gráfo:"
-        "<p><center><img src=\"graph_legend."+Config_getEnum("DOT_IMAGE_FORMAT")+"\"></center>\n"
+        "<p><center><img src=\"graph_legend."+getDotImageExtension()+"\"></center>\n"
         "<p>\n"
         "As caixas no grafo acima tem as seguintes interpretações:\n"
         "<ul>\n"
diff --git a/src/translator_ca.h b/src/translator_ca.h
index 5c3e595..2f90950 100644
--- a/src/translator_ca.h
+++ b/src/translator_ca.h
@@ -1019,7 +1019,7 @@ class TranslatorCatalan : public TranslatorAdapter_1_8_0
         "};\n"
         "\\endcode\n"
         "Resultarà el gràfic següent:"
-        "<p><center><img alt=\"\" src=\"graph_legend."+Config_getEnum("DOT_IMAGE_FORMAT")+"\"></center>\n"
+        "<p><center><img alt=\"\" src=\"graph_legend."+getDotImageExtension()+"\"></center>\n"
         "<p>\n"
         "Les caixes del gràfic superior tenen aquesta interpretació:\n"
         "<ul>\n"
diff --git a/src/translator_cn.h b/src/translator_cn.h
index fc01ce0..55a8e25 100644
--- a/src/translator_cn.h
+++ b/src/translator_cn.h
@@ -910,7 +910,7 @@ class TranslatorChinese : public TranslatorAdapter_1_8_2
         "};\n"
         "\\endcode\n"
         "结果将会生成以下图:"
-        "<p><center><img alt=\"\" src=\"graph_legend."+Config_getEnum("DOT_IMAGE_FORMAT")+"\"></center></p>\n"
+        "<p><center><img alt=\"\" src=\"graph_legend."+getDotImageExtension()+"\"></center></p>\n"
         "<p>\n"
         "上图中的矩形有如下意义:\n"
         "</p>\n"
diff --git a/src/translator_cz.h b/src/translator_cz.h
index b83eb92..f56adc5 100644
--- a/src/translator_cz.h
+++ b/src/translator_cz.h
@@ -1070,7 +1070,7 @@ class TranslatorCzech : public Translator
         "};\n"
         "\\endcode\n"
         "K výše uvedenému bude vygenerován následující graf:"
-        "<p><center><img src=\"graph_legend."+Config_getEnum("DOT_IMAGE_FORMAT")+"\"></center>\n"
+        "<p><center><img src=\"graph_legend."+getDotImageExtension()+"\"></center>\n"
         "<p>\n"
         "Bloky (tj. uzly) v uvedeném grafu mají následující význam:\n"
         "<ul>\n"
diff --git a/src/translator_de.h b/src/translator_de.h
index d936bf1..9caecfc 100644
--- a/src/translator_de.h
+++ b/src/translator_de.h
@@ -1116,7 +1116,7 @@ class TranslatorGerman : public TranslatorAdapter_1_8_4
         "};\n"
         "\\endcode\n"
         "Dies liefert den folgenden Graphen:"
-        "<p><center><img alt=\"\" src=\"graph_legend."+Config_getEnum("DOT_IMAGE_FORMAT")+"\"></center></p>\n"
+        "<p><center><img alt=\"\" src=\"graph_legend."+getDotImageExtension()+"\"></center></p>\n"
         "<p>\n"
         "Die Rechtecke in obigem Graphen bedeuten:\n"
         "</p>\n"
diff --git a/src/translator_dk.h b/src/translator_dk.h
index 74b07f4..2904a76 100644
--- a/src/translator_dk.h
+++ b/src/translator_dk.h
@@ -993,7 +993,7 @@ class TranslatorDanish : public TranslatorAdapter_1_8_0
         "\\endcode\n"
         "Hvis \\c MAX_DOT_GRAPH_HEIGHT i konfigurationsfilen "
         "er sat til 240, vil dette resultere i følgende graf:"
-        "<p><center><img src=\"graph_legend."+Config_getEnum("DOT_IMAGE_FORMAT")+"\"></center>\n"
+        "<p><center><img src=\"graph_legend."+getDotImageExtension()+"\"></center>\n"
         "<p>\n"
         "De forskellige slags kasser i ovenstående graf har følgende "
 		"betydninger:\n"
diff --git a/src/translator_en.h b/src/translator_en.h
index 5937ed3..cf2424f 100644
--- a/src/translator_en.h
+++ b/src/translator_en.h
@@ -1014,7 +1014,7 @@ class TranslatorEnglish : public Translator
         "};\n"
         "\\endcode\n"
         "This will result in the following graph:"
-        "<p><center><img alt=\"\" src=\"graph_legend."+Config_getEnum("DOT_IMAGE_FORMAT")+"\"></center></p>\n"
+        "<p><center><img alt=\"\" src=\"graph_legend."+getDotImageExtension()+"\"></center></p>\n"
         "<p>\n"
         "The boxes in the above graph have the following meaning:\n"
         "</p>\n"
diff --git a/src/translator_eo.h b/src/translator_eo.h
index e1513cb..e285a14 100644
--- a/src/translator_eo.h
+++ b/src/translator_eo.h
@@ -1017,7 +1017,7 @@ class TranslatorEsperanto : public TranslatorAdapter_1_8_4
         "};\n"
         "\\endcode\n"
         "Tio ĉi liveros la sekvan diagramon:"
-        "<p><center><img alt=\"\" src=\"graph_legend."+Config_getEnum("DOT_IMAGE_FORMAT")+"\"></center>\n"
+        "<p><center><img alt=\"\" src=\"graph_legend."+getDotImageExtension()+"\"></center>\n"
         "<p>\n"
         "La skatoloj de la supra diagramo havas la sekvajn signifojn:\n"
         "<ul>\n"
diff --git a/src/translator_es.h b/src/translator_es.h
index ba6e823..9c5860a 100644
--- a/src/translator_es.h
+++ b/src/translator_es.h
@@ -1045,7 +1045,7 @@ class TranslatorSpanish : public Translator
         "};\n"
         "\\endcode\n"
         "Dará como resultado el siguiente gráfico:"
-        "<p><center><img alt=\"\" src=\"graph_legend."+Config_getEnum("DOT_IMAGE_FORMAT")+"\"></center></p>\n"
+        "<p><center><img alt=\"\" src=\"graph_legend."+getDotImageExtension()+"\"></center></p>\n"
         "<p>\n"
         "Las cajas en el gráfico arriba tienen el siguiente significado:\n"
         "</p>\n"
diff --git a/src/translator_fa.h b/src/translator_fa.h
index 7b6f9d7..0fdc9a3 100644
--- a/src/translator_fa.h
+++ b/src/translator_fa.h
@@ -1015,7 +1015,7 @@ class TranslatorPersian : public TranslatorAdapter_1_7_5
         "\\endcode\n"
         "If the \\c MAX_DOT_GRAPH_HEIGHT tag in the configuration file "
         "is set to 240 this will result in the following graph:"
-        "<p><center><img alt=\"\" src=\"graph_legend."+Config_getEnum("DOT_IMAGE_FORMAT")+"\"></center>\n"
+        "<p><center><img alt=\"\" src=\"graph_legend."+getDotImageExtension()+"\"></center>\n"
         "<p>\n"
         "The boxes in the above graph have the following meaning:\n"
         "<ul>\n"
diff --git a/src/translator_fi.h b/src/translator_fi.h
index eeeb9a5..d468c5c 100644
--- a/src/translator_fi.h
+++ b/src/translator_fi.h
@@ -1114,7 +1114,7 @@ class TranslatorFinnish : public TranslatorAdapter_1_6_0
         "\\endcode\n"
         "Tuloksena on seuraavanlainen kaavio:"
         //"This will result in the following graph:"
-        "<p><center><img alt=\"\" src=\"graph_legend."+Config_getEnum("DOT_IMAGE_FORMAT")+"\"></center>\n"
+        "<p><center><img alt=\"\" src=\"graph_legend."+getDotImageExtension()+"\"></center>\n"
         "<p>\n"
         "Ylläolevassa kaaviossa laatikoilla on seuraavat merkitykset\n:"
         // "The boxes in the above graph have the following meaning:\n"
diff --git a/src/translator_fr.h b/src/translator_fr.h
index 2c548c2..cf8e2e2 100644
--- a/src/translator_fr.h
+++ b/src/translator_fr.h
@@ -1077,7 +1077,7 @@ class TranslatorFrench : public Translator
             "};\n"
             "\\endcode\n"
             "Cela aboutira au graphe suivant :"
-            "<p><center><img alt=\"\" src=\"graph_legend."+Config_getEnum("DOT_IMAGE_FORMAT")+"\"></center></p>\n"
+            "<p><center><img alt=\"\" src=\"graph_legend."+getDotImageExtension()+"\"></center></p>\n"
             "<p>\n"
             "Les rectangles du graphe ci-dessus ont la signification suivante :\n"
             "<ul>\n"
@@ -2057,4 +2057,4 @@ class TranslatorFrench : public Translator
 
 };
 
-#endif
\ No newline at end of file
+#endif
diff --git a/src/translator_gr.h b/src/translator_gr.h
index fa7a682..bfcd864 100644
--- a/src/translator_gr.h
+++ b/src/translator_gr.h
@@ -987,7 +987,7 @@ class TranslatorGreek : public TranslatorAdapter_1_8_4
         "};\n"
         "\\endcode\n"
         "Αυτό οδηγεί στο επόμενο διάγραμμα:"
-        "<p><center><img alt=\"\" src=\"graph_legend."+Config_getEnum("DOT_IMAGE_FORMAT")+"\"></center></p>\n"
+        "<p><center><img alt=\"\" src=\"graph_legend."+getDotImageExtension()+"\"></center></p>\n"
         "<p>\n"
         "Τα κουτιά στο παραπάνω διάγραμμα έχουν την ακόλουθη σημασία:\n"
         "</p>\n"
diff --git a/src/translator_hr.h b/src/translator_hr.h
index 98a746a..e9f0719 100644
--- a/src/translator_hr.h
+++ b/src/translator_hr.h
@@ -753,7 +753,7 @@ class TranslatorCroatian : public TranslatorAdapter_1_8_2
         "};\n"
         "\\endcode\n"
         "To će rezultirati grafikonom:"
-        "<p><center><img src=\"graph_legend."+Config_getEnum("DOT_IMAGE_FORMAT")+"\"></center>\n"
+        "<p><center><img src=\"graph_legend."+getDotImageExtension()+"\"></center>\n"
         "<p>\n"
         "Pravokutnici imaju slijedeće značenje:\n"
         "<ul>\n"
diff --git a/src/translator_hu.h b/src/translator_hu.h
index 610af8e..4892600 100644
--- a/src/translator_hu.h
+++ b/src/translator_hu.h
@@ -997,7 +997,7 @@ class TranslatorHungarian : public TranslatorAdapter_1_4_6
         "\\endcode\n"
         "Ha a konfigurációs fájl \\c MAX_DOT_GRAPH_HEIGHT elemének értékét "
         "240-re állítjuk, az eredmény a következő ábra lesz:"
-        "<p><center><img src=\"graph_legend."+Config_getEnum("DOT_IMAGE_FORMAT")+"\"></center>\n"
+        "<p><center><img src=\"graph_legend."+getDotImageExtension()+"\"></center>\n"
         "<p>\n"
         "Az ábrán levő dobozok jelentése:\n"
         "<ul>\n"
diff --git a/src/translator_id.h b/src/translator_id.h
index 5647bc0..dd79cd7 100644
--- a/src/translator_id.h
+++ b/src/translator_id.h
@@ -1001,7 +1001,7 @@ class TranslatorIndonesian : public TranslatorAdapter_1_8_0
         "\\endcode\n"
         "Apabila tag \\c MAX_DOT_GRAPH_HEIGHT di file konfigurasi "
         "diset ke 240 kode di atas akan menghasilkan bagan berikut:"
-        "<p><center><img alt=\"\" src=\"graph_legend."+Config_getEnum("DOT_IMAGE_FORMAT")+"\"></center>\n"
+        "<p><center><img alt=\"\" src=\"graph_legend."+getDotImageExtension()+"\"></center>\n"
         "<p>\n"
         "Kotak-kotak pada bagan di atas mempunyai arti sebagai berikut:\n"
         "<ul>\n"
diff --git a/src/translator_it.h b/src/translator_it.h
index 59799a3..65be176 100644
--- a/src/translator_it.h
+++ b/src/translator_it.h
@@ -1028,7 +1028,7 @@ class TranslatorItalian : public TranslatorAdapter_1_8_2
         "};\n"
         "\\endcode\n"
         "Verrà prodotto il grafo seguente:"
-        "<p><center><img src=\"graph_legend."+Config_getEnum("DOT_IMAGE_FORMAT")+"\"></center></p>\n"
+        "<p><center><img src=\"graph_legend."+getDotImageExtension()+"\"></center></p>\n"
         "<p>\n"
         "I riquadri nel grafo qui sopra hanno il seguente significato:\n"
         "</p>\n"
diff --git a/src/translator_jp.h b/src/translator_jp.h
index ae3605a..6142e53 100644
--- a/src/translator_jp.h
+++ b/src/translator_jp.h
@@ -1037,7 +1037,7 @@ class TranslatorJapanese : public Translator
         "\\c MAX_DOT_GRAPH_" /* わざわざちょん切っているのは doc/translator.py の検出回避のため */
         "HEIGHT タグに 200 を与えた設定ファイル"
         "を使うと、次のようなグラフとなります。"
-        "<p><center><img src=\"graph_legend."+Config_getEnum("DOT_IMAGE_FORMAT")+"\"></center>\n"
+        "<p><center><img src=\"graph_legend."+getDotImageExtension()+"\"></center>\n"
         "<p>\n"
         "グラフ内の矩形は構造体やクラスを表しています。色の意味は次の通りです。\n"
         "<ul>\n"
diff --git a/src/translator_kr.h b/src/translator_kr.h
index 18337a5..ff9da26 100644
--- a/src/translator_kr.h
+++ b/src/translator_kr.h
@@ -1035,7 +1035,7 @@ class TranslatorKorean : public Translator
         "};\n"
         "\\endcode\n"
         "다음과 같은 그래프가 출력될 것입니다. :"
-        "<p><center><img alt=\"\" src=\"graph_legend."+Config_getEnum("DOT_IMAGE_FORMAT")+"\"></center>\n"
+        "<p><center><img alt=\"\" src=\"graph_legend."+getDotImageExtension()+"\"></center>\n"
         "<p>\n"
         "위 그래프의 박스들은 다음과 같은 의미를 가집니다. :\n"
         "<ul>\n"
diff --git a/src/translator_lt.h b/src/translator_lt.h
index 174170e..98bd692 100644
--- a/src/translator_lt.h
+++ b/src/translator_lt.h
@@ -1006,7 +1006,7 @@ class TranslatorLithuanian : public TranslatorAdapter_1_4_6
         "\\endcode\n"
         "If the \\c MAX_DOT_GRAPH_HEIGHT tag in the configuration file "
         "is set to 240 this will result in the following graph:"
-        "<p><center><img alt=\"\" src=\"graph_legend."+Config_getEnum("DOT_IMAGE_FORMAT")+"\"></center>\n"
+        "<p><center><img alt=\"\" src=\"graph_legend."+getDotImageExtension()+"\"></center>\n"
         "<p>\n"
         "The boxes in the above graph have the following meaning:\n"
         "<ul>\n"
diff --git a/src/translator_lv.h b/src/translator_lv.h
index 135cd11..bd069f1 100644
--- a/src/translator_lv.h
+++ b/src/translator_lv.h
@@ -1020,7 +1020,7 @@ class TranslatorLatvian : public TranslatorAdapter_1_8_4
         "};\n"
         "\\endcode\n"
         "This will result in the following graph:"
-        "<p><center><img alt=\"\" src=\"graph_legend."+Config_getEnum("DOT_IMAGE_FORMAT")+"\"></center></p>\n"
+        "<p><center><img alt=\"\" src=\"graph_legend."+getDotImageExtension()+"\"></center></p>\n"
         "<p>\n"
         "The boxes in the above graph have the following meaning:\n"
         "</p>\n"
diff --git a/src/translator_mk.h b/src/translator_mk.h
index 510561e..e2ec041 100644
--- a/src/translator_mk.h
+++ b/src/translator_mk.h
@@ -1003,7 +1003,7 @@ class TranslatorMacedonian : public TranslatorAdapter_1_6_0
         "\\endcode\n"
         "Ако вредноста на \\c MAX_DOT_GRAPH_HEIGHT во конфигурациската датотека "
         "е 240 тогаш примерот ќе го создаде следниов дијаграм:"
-        "<p><center><img alt=\"\" src=\"graph_legend."+Config_getEnum("DOT_IMAGE_FORMAT")+"\"></center>\n"
+        "<p><center><img alt=\"\" src=\"graph_legend."+getDotImageExtension()+"\"></center>\n"
         "<p>\n"
         "Правоаголниците во дијаграмот погоре го имаат следново значење:\n"
         "<ul>\n"
diff --git a/src/translator_nl.h b/src/translator_nl.h
index 2ffacb6..1f59ed2 100644
--- a/src/translator_nl.h
+++ b/src/translator_nl.h
@@ -656,7 +656,7 @@ class TranslatorDutch : public Translator
         "};\n"
         "\\endcode\n"
         "Dit voorbeeld zal resulteren in de volgende graaf:"
-        "<p><center><img src=\"graph_legend."+Config_getEnum("DOT_IMAGE_FORMAT")+"\"></center>\n"
+        "<p><center><img src=\"graph_legend."+getDotImageExtension()+"\"></center>\n"
         "<p>\n"
         "De rechthoeken in the bovenstaande graaf hebben de volgende betekenis:\n"
         "<ul>\n"
diff --git a/src/translator_no.h b/src/translator_no.h
index 2662e47..5bf6c17 100644
--- a/src/translator_no.h
+++ b/src/translator_no.h
@@ -1048,7 +1048,7 @@ class TranslatorNorwegian : public TranslatorAdapter_1_4_6
         "\\endcode\n"
         "Hvis \\c MAX_DOT_GRAPH_HEIGHT er satt til 200 i "
         "konfigurasjonsfila vil dette resultere i følgende graf:"
-        "<p><center><img src=\"graph_legend."+Config_getEnum("DOT_IMAGE_FORMAT")+"\"></center>\n"
+        "<p><center><img src=\"graph_legend."+getDotImageExtension()+"\"></center>\n"
         "<p>\n"
         "Boksene i grafen over betyr følgende:\n"
         "<ul>\n"
diff --git a/src/translator_pl.h b/src/translator_pl.h
index 6f2e14c..0b23775 100644
--- a/src/translator_pl.h
+++ b/src/translator_pl.h
@@ -1012,7 +1012,7 @@ class TranslatorPolish : public TranslatorAdapter_1_8_2
         "};\n"
         "\\endcode\n"
         "Rezultat na następującym wykresie:"
-        "<p><center><img src=\"graph_legend."+Config_getEnum("DOT_IMAGE_FORMAT")+"\"></center></p>\n"
+        "<p><center><img src=\"graph_legend."+getDotImageExtension()+"\"></center></p>\n"
         "<p>\n"
         "Prostokąty w powyższym wykresie mają następujące znaczenie:\n"
         "</p>\n"
diff --git a/src/translator_pt.h b/src/translator_pt.h
index 13422f6..be45424 100644
--- a/src/translator_pt.h
+++ b/src/translator_pt.h
@@ -1016,7 +1016,7 @@ class TranslatorPortuguese : public Translator
         "};\n"
         "\\endcode\n"
         "Isto irá gerar o seguinte gráfo:"
-        "<p><center><img src=\"graph_legend."+Config_getEnum("DOT_IMAGE_FORMAT")+"\"></center>\n"
+        "<p><center><img src=\"graph_legend."+getDotImageExtension()+"\"></center>\n"
         "<p>\n"
         "As caixas no grafo anterior têm as seguintes interpretações:\n"
         "<ul>\n"
diff --git a/src/translator_ro.h b/src/translator_ro.h
index ea0988d..bde0f24 100644
--- a/src/translator_ro.h
+++ b/src/translator_ro.h
@@ -1031,7 +1031,7 @@ class TranslatorRomanian : public Translator
         "\\endcode\n"
         "Dacă tagul \\c MAX_DOT_GRAPH_HEIGHT din fişierul de configurare "
         "este setat la 200, acesta este graful rezultat:"
-        "<p><center><img src=\"graph_legend."+Config_getEnum("DOT_IMAGE_FORMAT")+"\"></center>\n"
+        "<p><center><img src=\"graph_legend."+getDotImageExtension()+"\"></center>\n"
         "<p>\n"
         "Căsuţele din partea de sus au următoarea semnificaţie:\n"
         "<ul>\n"
diff --git a/src/translator_ru.h b/src/translator_ru.h
index c06d911..94ddf29 100644
--- a/src/translator_ru.h
+++ b/src/translator_ru.h
@@ -1004,7 +1004,7 @@ class TranslatorRussian : public Translator
         "\\endcode\n"
         "Если \\c MAX_DOT_GRAPH_HEIGHT в конфигурационном файле "
         "установлен в 240, получится следующий граф:"
-        "<p><center><img src=\"graph_legend."+Config_getEnum("DOT_IMAGE_FORMAT")+"\"></center>\n"
+        "<p><center><img src=\"graph_legend."+getDotImageExtension()+"\"></center>\n"
         "<p>\n"
         "Прямоугольники в этом графе имеют следующее значение:\n"
         "<ul>\n"
diff --git a/src/translator_sc.h b/src/translator_sc.h
index 84e8756..5e37724 100644
--- a/src/translator_sc.h
+++ b/src/translator_sc.h
@@ -1033,7 +1033,7 @@ class TranslatorSerbianCyrillic : public TranslatorAdapter_1_6_0
         "\\endcode\n"
         "Ако је \\c MAX_DOT_GRAPH_HEIGHT таг у конфигурационој датотеци "
         "подешен на 240, то ће резултовати на следећи начин:"
-        "<p><center><img alt=\"\" src=\"graph_legend."+Config_getEnum("DOT_IMAGE_FORMAT")+"\"></center>\n"
+        "<p><center><img alt=\"\" src=\"graph_legend."+getDotImageExtension()+"\"></center>\n"
         "<p>\n"
         "Правоугаоници имају следеће значење:\n"
         "<ul>\n"
diff --git a/src/translator_si.h b/src/translator_si.h
index 33bc27a..b6d6a87 100644
--- a/src/translator_si.h
+++ b/src/translator_si.h
@@ -684,7 +684,7 @@ class TranslatorSlovene : public TranslatorAdapter_1_4_6
         "\\endcode\n"
         "If the \\c MAX_DOT_GRAPH_HEIGHT tag in the configuration file "
         "is set to 200 this will result in the following graph:"
-        "<p><center><img src=\"graph_legend."+Config_getEnum("DOT_IMAGE_FORMAT")+"\"></center>\n"
+        "<p><center><img src=\"graph_legend."+getDotImageExtension()+"\"></center>\n"
         "<p>\n"
         "The boxes in the above graph have the following meaning:\n"
         "<ul>\n"
diff --git a/src/translator_sk.h b/src/translator_sk.h
index 0fc826b..d8f06f5 100644
--- a/src/translator_sk.h
+++ b/src/translator_sk.h
@@ -1004,7 +1004,7 @@ class TranslatorSlovak : public Translator
         "};\n"
         "\\endcode\n"
         "K vyššie uvedenému bude vygenerovaný nasledujúci graf:"
-        "<p><center><img src=\"graph_legend."+Config_getEnum("DOT_IMAGE_FORMAT")+"\"></center>\n"
+        "<p><center><img src=\"graph_legend."+getDotImageExtension()+"\"></center>\n"
         "<p>\n"
         "Bloky (tj. uzly) v uvedenom grafe majú nasledujúci význam:\n"
         "<ul>\n"
diff --git a/src/translator_sr.h b/src/translator_sr.h
index 09b6534..5e09f60 100644
--- a/src/translator_sr.h
+++ b/src/translator_sr.h
@@ -1001,7 +1001,7 @@ class TranslatorSerbian : public TranslatorAdapter_1_6_0
         "\\endcode\n"
         "Ako je \\c MAX_DOT_GRAPH_HEIGHT tag u konfiguracionoj datoteci "
         "postavljen na \\c 200 graf izvođenja će izgledati ovako:"
-        "<p><center><img src=\"graph_legend."+Config_getEnum("DOT_IMAGE_FORMAT")+"\"></center>\n"
+        "<p><center><img src=\"graph_legend."+getDotImageExtension()+"\"></center>\n"
         "Graf će biti odsečen ako ne stane unutar zadatih granica.\n"
         "<p>\n"
         "Pravougaonici imaju sledeća značenja:\n"
diff --git a/src/translator_sv.h b/src/translator_sv.h
index 5b36a17..d41a203 100644
--- a/src/translator_sv.h
+++ b/src/translator_sv.h
@@ -907,7 +907,7 @@ class TranslatorSwedish : public Translator
         "};\n"
         "\\endcode\n"
 	"Detta resulterar i att följande graf genereras:"
-        "<p><center><img alt=\"\" src=\"graph_legend."+Config_getEnum("DOT_IMAGE_FORMAT")+"\"></center></p>\n"
+        "<p><center><img alt=\"\" src=\"graph_legend."+getDotImageExtension()+"\"></center></p>\n"
         "<p>\n"
 	"Rektanglarna i den ovanstående grafen har följande betydelser:\n"
         "<ul>\n"
diff --git a/src/translator_tr.h b/src/translator_tr.h
index 56b4a19..e02c1fe 100644
--- a/src/translator_tr.h
+++ b/src/translator_tr.h
@@ -1016,7 +1016,7 @@ class TranslatorTurkish : public TranslatorAdapter_1_7_5
         "};\n"
         "\\endcode\n"
         "Bu kod aşağıdaki şemayı oluşturur:"
-        "<p><center><img alt=\"\" src=\"graph_legend."+Config_getEnum("DOT_IMAGE_FORMAT")+"\"></center>\n"
+        "<p><center><img alt=\"\" src=\"graph_legend."+getDotImageExtension()+"\"></center>\n"
         "<p>\n"
         "Yukarıdaki şemadaki kutular aşağıda açıklanmıştır:\n"
         "<ul>\n"
diff --git a/src/translator_tw.h b/src/translator_tw.h
index 7ff5b6c..a1faab9 100644
--- a/src/translator_tw.h
+++ b/src/translator_tw.h
@@ -1022,7 +1022,7 @@ class TranslatorChinesetraditional : public Translator
         "};\n"
         "\\endcode\n"
         "這個例子會產生下列的圖示:"
-        "<p><center><img alt=\"\" src=\"graph_legend."+Config_getEnum("DOT_IMAGE_FORMAT")+"\"></center></p>\n"
+        "<p><center><img alt=\"\" src=\"graph_legend."+getDotImageExtension()+"\"></center></p>\n"
         "<p>\n"
         "上圖中的各區塊意義如下:\n"
         "</p>\n"
diff --git a/src/translator_ua.h b/src/translator_ua.h
index 45efd6e..12440cf 100644
--- a/src/translator_ua.h
+++ b/src/translator_ua.h
@@ -993,7 +993,7 @@ class TranslatorUkrainian : public TranslatorAdapter_1_8_4
         "};\n"
         "\\endcode\n"
         "Таким чином, отримуємо наступний граф:"
-        "<p><center><img src=\"graph_legend."+Config_getEnum("DOT_IMAGE_FORMAT")+"\"></center>\n"
+        "<p><center><img src=\"graph_legend."+getDotImageExtension()+"\"></center>\n"
         "<p>\n"
         "Прямокутники в цьому графі мають наступний зміст:\n"
         "<ul>\n"
diff --git a/src/translator_vi.h b/src/translator_vi.h
index dd0a8f1..6fe38ba 100644
--- a/src/translator_vi.h
+++ b/src/translator_vi.h
@@ -1021,7 +1021,7 @@ class TranslatorVietnamese : public TranslatorAdapter_1_6_0
         "};\n"
         "\\endcode\n"
         "Kết quả trong biểu đồ sau đây:"
-        "<p><center><img alt=\"\" src=\"graph_legend."+Config_getEnum("DOT_IMAGE_FORMAT")+"\"></center>\n"
+        "<p><center><img alt=\"\" src=\"graph_legend."+getDotImageExtension()+"\"></center>\n"
         "<p>\n"
         "Các hộp trong biểu đồ trên có ý nghĩa như sau:\n"
         "<ul>\n"
diff --git a/src/translator_za.h b/src/translator_za.h
index f47052e..a9ed3e4 100644
--- a/src/translator_za.h
+++ b/src/translator_za.h
@@ -1002,7 +1002,7 @@ class TranslatorAfrikaans : public TranslatorAdapter_1_6_0
         "\\endcode\n"
         "As die \\c MAX_DOT_GRAPH_HEIGHT merker in die konfigurasie leër "
         "aan 240 gelyk gestel is, word die volgende diagram geproduseer:"
-        "<p><center><img alt=\"\" src=\"graph_legend."+Config_getEnum("DOT_IMAGE_FORMAT")+"\"></center>\n"
+        "<p><center><img alt=\"\" src=\"graph_legend."+getDotImageExtension()+"\"></center>\n"
         "<p>\n"
         "Die reghoeke in die diagram het die volgende betekenis:\n"
         "<ul>\n"
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;
+}
diff --git a/src/util.h b/src/util.h
index 937b222..b044d26 100644
--- a/src/util.h
+++ b/src/util.h
@@ -443,6 +443,8 @@ bool protectionLevelVisible(Protection prot);
 
 QCString stripIndentation(const QCString &s);
 
+QCString getDotImageExtension(void);
+
 bool fileVisibleInIndex(FileDef *fd,bool &genSourceFile);
 
 void addDocCrossReference(MemberDef *src,MemberDef *dst);
diff --git a/src/vhdldocgen.cpp b/src/vhdldocgen.cpp
index 170bf5b..e24a224 100644
--- a/src/vhdldocgen.cpp
+++ b/src/vhdldocgen.cpp
@@ -2792,7 +2792,8 @@ bool VhdlDocGen::findConstraintFile(LayoutNavEntry *lne)
   QCString file;
   QCString co("Constraints");
 
-  if (Config_getBool("HAVE_DOT") && Config_getEnum("DOT_IMAGE_FORMAT")=="svg")
+  QCString imgExt = getDotImageExtension();
+  if (Config_getBool("HAVE_DOT") && imgExt=="svg")
   {
     QCString ov = theTranslator->trDesignOverview();
     QCString ofile("vhdl_design_overview");