Fix some memory leaks.

Update the retain/release mechanism for
CGContexts. Some leaks were due to unnecessary
retain calls.

Task-number: QTBUG-15373
Reviewed-by: Samuel Rødal

4 files changed, 9 insertions, 1 deletions

diff --git a/src/gui/painting/qpaintengine_mac.cpp b/src/gui/painting/qpaintengine_mac.cpp
index e5323d8..601cf86 100644
--- a/src/gui/painting/qpaintengine_mac.cpp
+++ b/src/gui/painting/qpaintengine_mac.cpp
@@ -131,8 +131,9 @@ QMacCGContext::QMacCGContext(QPainter *p)
 
             CGContextTranslateCTM(context, native.dx(), native.dy());
         }
+    } else {
+        CGContextRetain(context);
     }
-    CGContextRetain(context);
 }
 
 
diff --git a/src/gui/painting/qunifiedtoolbarsurface_mac.cpp b/src/gui/painting/qunifiedtoolbarsurface_mac.cpp
index b25757b..ace0a46 100644
--- a/src/gui/painting/qunifiedtoolbarsurface_mac.cpp
+++ b/src/gui/painting/qunifiedtoolbarsurface_mac.cpp
@@ -188,6 +188,8 @@ void QUnifiedToolbarSurface::flush(QWidget *widget, const QRegion &rgn, const QP
 
     // Restore context.
     CGContextRestoreGState(context);
+    CGContextRelease(context);
+    widget->d_func()->cgContext = 0;
     widget->d_func()->hasOwnContext = false;
 }
 
diff --git a/src/gui/painting/qwindowsurface_mac.cpp b/src/gui/painting/qwindowsurface_mac.cpp
index 1c97ebb..9f24532 100644
--- a/src/gui/painting/qwindowsurface_mac.cpp
+++ b/src/gui/painting/qwindowsurface_mac.cpp
@@ -82,6 +82,7 @@ void QMacWindowSurface::flush(QWidget *widget, const QRegion &rgn, const QPoint
     extern CGContextRef qt_mac_graphicsContextFor(QWidget *);
     CGContextRef context = qt_mac_graphicsContextFor(widget);
 #endif
+    CGContextRetain(context);
     CGContextSaveGState(context);
 
     // Flip context.
@@ -109,6 +110,7 @@ void QMacWindowSurface::flush(QWidget *widget, const QRegion &rgn, const QPoint
 #else
     CGContextFlush(context);
 #endif
+    CGContextRelease(context);
 }
 
 void QMacWindowSurface::setGeometry(const QRect &rect)
diff --git a/src/gui/painting/qwindowsurface_raster.cpp b/src/gui/painting/qwindowsurface_raster.cpp
index ae73d7d..2b4e125 100644
--- a/src/gui/painting/qwindowsurface_raster.cpp
+++ b/src/gui/painting/qwindowsurface_raster.cpp
@@ -285,6 +285,7 @@ void QRasterWindowSurface::flush(QWidget *widget, const QRegion &rgn, const QPoi
     extern CGContextRef qt_mac_graphicsContextFor(QWidget *);
     CGContextRef context = qt_mac_graphicsContextFor(widget);
 #endif
+    CGContextRetain(context);
     CGContextSaveGState(context);
 
     // Flip context.
@@ -317,6 +318,8 @@ void QRasterWindowSurface::flush(QWidget *widget, const QRegion &rgn, const QPoi
 
     // Restore context.
     CGContextRestoreGState(context);
+    CGContextRelease(context);
+
 
 #endif // Q_WS_MAC