Information required for cairo gl backend regarding CAIRO_OPERATOR_SOURCE

Hi,


We are writing some test cases to compare cairo gl backend with cairo image backend.


1) Image clipping does not work for CAIRO_OPERATOR_SOURCE.


Though it works with bounded rectangle with cairo_fill.


Below applicaiton code does NOT work. It throws gl error 1282(Invalid Operation)


---------------------------------------------------------
cairo_rectangle(m_cr, 0, 0, width,height);
cairo_clip(m_cr);
cairo_set_source_surface(m_cr,glSrcSurface, 0 , 0);
cairo_paint(m_cr);
---------------------------------------------------------
What works is below:
-------------------------
cairo_rectangle(m_cr, 0, 0, width,height);
cairo_set_source_surface(m_cr, glSrcSurface, 0 , 0);
cairo_fill(m_cr);
-------------------------


Image clipping with image surface works well.


Please suggest waht could be the issue.


Thanks in advance,


Sumit

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