Sets the given pixbuf as the source pattern for cr.
The pattern has an extend mode of cairo_extend_none and is aligned so that the origin of pixbuf
is pixbuf_x, pixbuf_y.
| cr |
a cairo context |
| pixbuf |
a Pixbuf |
| pixbuf_x |
X coordinate of location to place upper left corner of |
| pixbuf_y |
Y coordinate of location to place upper left corner of |