[cairo] set/get_user_data

[Jost Boekemeier]

> I used to want this too, but I was suggested to
> maintain my own stack by
> treating each cairo_t as a state.

Each cairo_t is a state.  But sometimes you want to
attach and retrieve external graphics state which can
only be emulated by cairo.

For example the background color used in traditional
X11.  With the two functions you can attach the data
to the cairo_t and retrieve it later to translate it
into the appropriate cairo commands. 

Jost



	

	
		
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