Initialize function tables without QGuiApplication

QImage can be used without QGuiApplication, but wihout QGuiApplication
the accelerated methods would not be used.

This patch changes the initialization of the QtGui function tables to
happen in static object constructors on QtGui load, instead of in
the QGuiApplication init.

Change-Id: Ib58982fbc50fd79122352d021d93a3c99aca5043
Reviewed-by: Erik Verbruggen <erik.verbruggen@theqtcompany.com>
Reviewed-by: Gunnar Sletta <gunnar@sletta.org>

1 files changed, 12 insertions, 1 deletions

diff --git a/src/gui/image/qimage_conversions.cpp b/src/gui/image/qimage_conversions.cpp
index 7d1fb23b15..cbdcf49da7 100644
--- a/src/gui/image/qimage_conversions.cpp
+++ b/src/gui/image/qimage_conversions.cpp
@@ -2920,7 +2920,7 @@ InPlace_Image_Converter qimage_inplace_converter_map[QImage::NImageFormats][QIma
     }  // Format_Grayscale8
 };
 
-void qInitImageConversions()
+static void qInitImageConversions()
 {
 #if defined(__SSE2__) && defined(QT_COMPILER_SUPPORTS_SSSE3)
     if (qCpuHasFeature(SSSE3)) {
@@ -2967,4 +2967,15 @@ void qInitImageConversions()
 #endif
 }
 
+class QImageConversionsInitializer {
+public:
+    QImageConversionsInitializer()
+    {
+        qInitImageConversions();
+    }
+};
+
+// Ensure initialization if this object file is linked.
+static QImageConversionsInitializer qImageConversionsInitializer;
+
 QT_END_NAMESPACE