memory leak in QPainter::drawText() when using QOpenGLPaintEngine

run the following program, you will see several memory leaks.

class CGLWidget : public QGLWidget
{
public:
CGLWidget(QWidget *parent = 0) : QGLWidget(QGLFormat(QGL::DoubleBuffer | QGL::SampleBuffers), parent)
{
}

protected:
virtual void paintEvent(QPaintEvent *e)
{
makeCurrent();

{ QPainter painter(this); painter.setRenderHint(QPainter::TextAntialiasing); painter.setPen(Qt::red); painter.drawText(100, 100, "Hello!"); }

swapBuffers();
}
};

int main(int argc, char *argv[])

{ QApplication a(argc, argv); CGLWidget w; w.show(); int ret = a.exec(); // get the current state of the flag int nCrtDbgFlag = _CrtSetDbgFlag(_CRTDBG_REPORT_FLAG); // set memory leak check flag nCrtDbgFlag |= _CRTDBG_LEAK_CHECK_DF; // set the new debug flag _CrtSetDbgFlag(nCrtDbgFlag); return ret; }