[cairo] Question about create_from_png

[silverburgh]

Hi,

I have a question about create_from_png () which documented here:
http://www.cairographics.org/documentation/cairomm/reference/classCairo_1_1ImageSurface.html#ac35bcd255347574036746810f8a2978


static RefPtr<ImageSurface>
Cairo::ImageSurface::create_from_png	(	std::string 	filename	 ) 	
[static]


If I put a filename say 'test.png', how does Cairo resolve the file
name to find the absolute path of the file?

Thank you.