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Diffstat (limited to 'src/gui/painting/qbackingstore.cpp')
| -rw-r--r-- | src/gui/painting/qbackingstore.cpp | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/src/gui/painting/qbackingstore.cpp b/src/gui/painting/qbackingstore.cpp index 0f7933c..3bbdf7f 100644 --- a/src/gui/painting/qbackingstore.cpp +++ b/src/gui/painting/qbackingstore.cpp @@ -258,7 +258,10 @@ void QWidgetBackingStore::unflushPaint(QWidget *widget, const QRegion &rgn) bool QWidgetBackingStore::bltRect(const QRect &rect, int dx, int dy, QWidget *widget) { const QPoint pos(tlwOffset + widget->mapTo(tlw, rect.topLeft())); - return windowSurface->scroll(QRect(pos, rect.size()), dx, dy); + const QRect tlwRect(QRect(pos, rect.size())); + if (dirty.intersects(tlwRect)) + return false; // We don't want to scroll junk. + return windowSurface->scroll(tlwRect, dx, dy); } void QWidgetBackingStore::releaseBuffer() |