WindowsXP-Style: Draw on DC of backing store for widgets only.

- Check the device type pof the painter passed in.
- Introduce convenience functions for retrieving the DC for
  widgets that default to the top level.

Change-Id: I18a8db02c8ffd7a249310a5ffaf3a530f0a3df40
Reviewed-by: Oliver Wolff <oliver.wolff@nokia.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/src/widgets/styles/qwindowsvistastyle.cpp b/src/widgets/styles/qwindowsvistastyle.cpp
index 252740cbab..09aec2f484 100644
--- a/src/widgets/styles/qwindowsvistastyle.cpp
+++ b/src/widgets/styles/qwindowsvistastyle.cpp
@@ -1010,12 +1010,12 @@ void QWindowsVistaStyle::drawControl(ControlElement element, const QStyleOption
                             QPainter startPainter(&startImage);
                             stateId = PBS_DEFAULTED;
                             XPThemeData theme(widget, &startPainter, name, partId, stateId, rect);
-                            d->drawBackground(theme, true); // Do not draw on HDC of backing store.
+                            d->drawBackground(theme);
 
                             QPainter alternatePainter(&alternateImage);
                             theme.stateId = PBS_DEFAULTED_ANIMATING;
                             theme.painter = &alternatePainter;
-                            d->drawBackground(theme, true); // Do not draw on HDC of backing store.
+                            d->drawBackground(theme);
                             pulse->setPrimaryImage(startImage);
                             pulse->setAlternateImage(alternateImage);
                             pulse->setStartTime(QTime::currentTime());