Refactor QApplication creation and fix lifetime of its args.

[mlt] / src / modules / qt / common.cpp

diff --git a/src/modules/qt/common.cpp b/src/modules/qt/common.cpp
new file mode 100644 (file)
index 0000000..9cd4cac
--- /dev/null
+++ b/src/modules/qt/common.cpp
@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2014 Dan Dennedy <dan@dennedy.org>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include "common.h"
+#include <QApplication>
+#include <QLocale>
+
+#if defined(Q_OS_UNIX) && !defined(Q_OS_MAC)
+#include <X11/Xlib.h>
+#endif
+
+bool createQApplicationIfNeeded(mlt_service service)
+{
+       if (!qApp) {
+#if defined(Q_OS_UNIX) && !defined(Q_OS_MAC)
+               XInitThreads();
+               if (getenv("DISPLAY") == 0) {
+                       mlt_log_error(service,
+                               "The MLT Qt module requires a X11 environment.\n"
+                               "Please either run melt from an X session or use a fake X server like xvfb:\n"
+                               "xvfb-run -a melt (...)\n" );
+                       return false;
+               }
+#endif
+               if (!mlt_properties_get(mlt_global_properties(), "qt_argv"))
+                       mlt_properties_set(mlt_global_properties(), "qt_argv", "MLT");
+               static int argc = 1;
+               static char* argv[] = { mlt_properties_get(mlt_global_properties(), "Qt argv") };
+               new QApplication(argc, argv);
+               const char *localename = mlt_properties_get_lcnumeric(MLT_SERVICE_PROPERTIES(service));
+               QLocale::setDefault(QLocale(localename));
+       }
+       return true;
+}