a filename for the PS output (must be writable), NULL may be used to specify no output. This will generate a PS surface that may be queried and used as a source, without generating a temporary file.
width of the surface, in points (1 point == 1/72.0 inch)
height of the surface, in points (1 point == 1/72.0 inch)
a pointer to the newly created surface. The caller owns the surface and should call cairo_surface_destroy() when done with it. This function always returns a valid pointer, but it will return a pointer to a "nil" surface if an error such as out of memory occurs. You can use cairo_surface_status() to check for this.
Creates a PostScript surface of the specified size in points to be written to filename. See cairo_ps_surface_create_for_stream() for a more flexible mechanism for handling the PostScript output than simply writing it to a named file. Note that the size of individual pages of the PostScript output can vary. See cairo_ps_surface_set_size(). Since 1.2