Memory leak in GraCard

QImage GLWidget::getImage(void){
  QGLPixelBuffer *buffer = new QGLPixelBuffer(mStartImage.width(),mStartImage.height());
  buffer->makeCurrent();
  initializeGL();
  QImage image = paintGL(buffer);
  glDeleteLists(mIndex, 1);
  buffer->doneCurrent();
  delete(buffer);
  return image;
}

void GLWidget::initializeGL(void){
  glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
  glClear(GL_COLOR_BUFFER_BIT);
  glEnable(GL_TEXTURE_2D);
  glViewport(0, 0, mWidth, mHeight);
  glMatrixMode(GL_PROJECTION);
  glOrtho(-mHeightHalf*1.77777, mHeightHalf*1.77777, -mHeightHalf, mHeightHalf,
    500.0, -500.0);
  glMatrixMode(GL_MODELVIEW);

  mIndex = glGenLists(1);
  glNewList(mIndex, GL_COMPILE);
    glBegin(GL_QUADS);
      glTexCoord2f(0.0, 0.0);
      glVertex2f(  -mWidthHalf, -mHeightHalf);

      glTexCoord2f(1.0,0.0);
      glVertex2f( mWidthHalf, -mHeightHalf);

      glTexCoord2f(1.0, 1.0);
      glVertex2f( mWidthHalf,  mHeightHalf);

      glTexCoord2f(0.0,1.0);
      glVertex2f(-mWidthHalf,  mHeightHalf);
    glEnd();
 glEndList();
}

QImage GLWidget::paintGL(QGLPixelBuffer *buffer){
  glLoadIdentity();
  glPushMatrix();

  mEndImageTexture = buffer->bindTexture(mEndImage,GL_TEXTURE_2D);
  glCallList(mIndex);
  glPopMatrix();
  glPushMatrix();
  float value = pow(1.6,mFactor-10)+1;
  glScalef(1.0/value, 1.0/value, 1.0/value);

   mStartImageTexture = buffer->bindTexture(mStartImage,GL_TEXTURE_2D);
   glCallList(mIndex);
   glPopMatrix();
#if 0
	buffer->deleteTexture(mStartImageTexture);
	buffer->deleteTexture(mEndImageTexture);
#endif
  glFlush();
  QImage image = buffer->toImage();
  return image;
}