Bundle an empty font file and pass it to projectM so it doesn't crash when FTGL is turned on.

data/data.qrc

@@ -250,5 +250,6 @@
         <file>icons/32x32/go-down.png</file>
         <file>icons/48x48/go-down.png</file>
         <file>hypnotoad.gif</file>
+        <file>blank.ttf</file>
     </qresource>
 </RCC>

src/visualisations/projectmvisualisation.cpp

@@ -28,6 +28,7 @@
 #include <QPaintEngine>
 #include <QPainter>
 #include <QSettings>
+#include <QTemporaryFile>
 #include <QtDebug>
 #include <QTimerEvent>
 
@@ -92,6 +93,12 @@ void ProjectMVisualisation::InitProjectM() {
     break;
   }
 
+  // Write an empty font out to a temporary directory.  libprojectM dies if it's
+  // compiled with FTGL support and you pass it an empty font URL, so we have
+  // to give it a dummy font even though we won't use it.
+  temporary_font_.reset(QTemporaryFile::createLocalFile(":blank.ttf"));
+  const QString font_path = temporary_font_->fileName();
+
   // Create projectM settings
   projectM::Settings s;
   s.meshX = 32;
@@ -106,12 +113,14 @@ void ProjectMVisualisation::InitProjectM() {
   s.shuffleEnabled = true;
   s.easterEgg = 0; // ??
   s.softCutRatingsEnabled = false;
+  s.menuFontURL = font_path.toStdString();
+  s.titleFontURL = font_path.toStdString();
 
   projectm_.reset(new projectM(s));
   preset_model_ = new ProjectMPresetModel(this, this);
   Load();
 
-  if (preset_path.isNull()) {
+  if (font_path.isNull()) {
     qWarning("ProjectM presets could not be found, search path was:\n  %s",
              paths.join("\n  ").toLocal8Bit().constData());
     QMessageBox::warning(NULL, tr("Missing projectM presets"),

src/visualisations/projectmvisualisation.h

@@ -29,6 +29,8 @@ class projectM;
 
 class ProjectMPresetModel;
 
+class QTemporaryFile;
+
 class ProjectMVisualisation : public QGraphicsScene, public BufferConsumer {
   Q_OBJECT
 public:
@@ -79,6 +81,8 @@ private:
   Mode mode_;
   int duration_;
 
+  boost::scoped_ptr<QTemporaryFile> temporary_font_;
+
   std::vector<int> default_rating_list_;
 
   int texture_size_;