qt-bugs@ issue :

Trolltech task ID :

bugs.kde.org number : None

applied: no

author: Clarence Dang <dang@kde.org>

Subject: QPixmap::setMask(QBitmap()) does not detach

From: Clarence Dang <dang@kde.org>

To: qt-bugs@trolltech.com

Date: 2006-09-05 12:40:27 +0000

Test case:

~~~

{

        QPixmap greenPixmap (100, 100);

        greenPixmap.fill (Qt::green);

        QBitmap greenPixmapTempMask (100, 100);

        greenPixmapTempMask.fill (Qt::color0/*transparent*/);

        greenPixmap.setMask (greenPixmapTempMask);

        QPixmap transPixmap = greenPixmap;

        // BUG: This mutates transPixmap

        greenPixmap.setMask (QBitmap ());

        greenPixmap.save ("green.png", "PNG");

        transPixmap.save ("trans.png", "PNG");

}

~~~

Index: src/gui/image/qpixmap_x11.cpp

===================================================================

--- src/gui/image/qpixmap_x11.cpp	(revision 563328)

+++ src/gui/image/qpixmap_x11.cpp	(working copy)

@@ -561,6 +561,7 @@ void QPixmap::setMask(const QBitmap &new

         } else

 #endif

             if (data->x11_mask) {

+                detach ();

 #ifndef QT_NO_XRENDER

                 if (data->picture) {

                     XRenderPictureAttributes attrs;