Probable division by zero is not taken care of in qpaintengineex_opengl2.cpp

details:
file: qpaintengineex_opengl2.cpp
line: "GLfloat dx = 1.0 / textureSize.width();"

We came across a situation where a QPixmap was given with a non-existant resource. This led to a pixmap with size (0,0) and textureSize.width() is also 0. We got a floating point exception as a result of this division.