create_pixmap(-Pixmap, +Attributes) create_pixmap(-Pixmap, +Attributes, +Graphics_attribs)
Pixmap is a newly created pixmap having the specified attributes.
If Graphics_attribs is given, it is a list of graphics attributes to
be given to the pixmap.
create_pixmap(P,A,G) is equivalent to
create_pixmap(P,A), put_graphics_attributes(P,G), but slightly more
efficient. But mainly it's more convenient.