func NewPDFSurface(filename string, widthInPoints, heightInPoints float64, version PDFVersion) *Surface {
cs := C.CString(filename)
defer C.free(unsafe.Pointer(cs))
s := C.cairo_pdf_surface_create(cs, C.double(widthInPoints), C.double(heightInPoints))
C.cairo_pdf_surface_restrict_to_version(s, C.cairo_pdf_version_t(version))
return &Surface{surface: s, context: C.cairo_create(s)}
}
//RestrictTo restricts the generated PDF to the specified verison.
//
//This method should only be called before any drawing operations have been
//performed on this surface.
//
//Originally cairo_pdf_surface_restrict_to_version.
func (s Surface) RestrictTo(v version) error {
C.cairo_pdf_surface_restrict_to_version(s.XtensionRaw(), C.cairo_pdf_version_t(v))
return s.Err()
}
