cairo-set-source-surface (cr surface x y)

cr -- a cairo-t context
surface -- a cairo-surface-t instance to be used to set the source pattern
x -- a double float user-space x coordinate for surface origin
y -- a double float user-space y coordinate for surface origin

This is a convenience function for creating a pattern from surface and setting it as the source in cr with the cairo-set-source function.

The x and y parameters give the user-space coordinate at which the surface origin should appear. The surface origin is its upper-left corner before any transformation has been applied. The x and y parameters are negated and then set as translation values in the pattern matrix.

Other than the initial translation pattern matrix, as described above, all other pattern attributes, such as its extend mode, are set to the default values as in the cairo-pattern-create-for-surface function. The resulting pattern can be queried with the cairo-get-source function so that these attributes can be modified if desired, e.g. to create a repeating pattern with with the cairo-pattern-set-extend function.