cairo-mesh-pattern-curve-to (pattern x1 y1 x2 y2 x3 y3)

pattern -- a cairo-pattern-t instance
x1 -- the double float x coordinate of the first control point
y1 -- the double float y coordinate of the first control point
x2 -- the double float y coordinate of the second control point
y2 -- the double float y coordinate of the second control point
x3 -- the double float x coordinate of the end of the curve
y3 -- the double float y coordinate of the end of the curve

Adds a cubic Bézier spline to the current patch from the current point to position (x3, y3) in pattern-space coordinates, using (x1, y1) and (x2, y2) as the control points.

If the current patch has no current point before the call to the function cairo-mesh-pattern-curve-to, this function will behave as if preceded by a call

(cairo-mesh-pattern-move-to pattern x1 y1)  

After this call the current point will be (x3, y3). If pattern is not a mesh pattern then pattern will be put into an error status with a status of :pattern-type-mismatch. If pattern has no current patch or the current patch already has 4 sides, pattern will be put into an error status with a status of :invalid-mesh-construction.