QtGui: Use QImage::constBits()/constScanLine() in non-const contexts.

Prevent potential detaching by using constBits()/constScanLine() instead
of bits()/scanLine().

Change-Id: If03f8d4d3b8ed4c07aed5eff7f580e57ca771919
Reviewed-by: Gunnar Sletta <gunnar@sletta.org>
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/src/gui/painting/qregion.cpp b/src/gui/painting/qregion.cpp
index 5e648eabf5..757c78cec8 100644
--- a/src/gui/painting/qregion.cpp
+++ b/src/gui/painting/qregion.cpp
@@ -3735,7 +3735,7 @@ static QRegionPrivate *PolygonRegion(const QPoint *Pts, int Count, int rule)
 
 QRegionPrivate *qt_bitmapToRegion(const QBitmap& bitmap)
 {
-    QImage image = bitmap.toImage();
+    const QImage image = bitmap.toImage();
 
     QRegionPrivate *region = new QRegionPrivate;
 
@@ -3753,7 +3753,7 @@ QRegionPrivate *qt_bitmapToRegion(const QBitmap& bitmap)
     int x,
         y;
     for (y = 0; y < image.height(); ++y) {
-        uchar *line = image.scanLine(y);
+        const uchar *line = image.constScanLine(y);
         int w = image.width();
         uchar all = zero;
         int prev1 = -1;