Inserts data into the buffer.
Inserts snip at position (x, y) in a drawing plane just in front of snip. If snip is null, then snip is inserted behind all other snips.
Inserts snip at position (x, y) in a drawing plane behind all other snips.
Inserts snip in the center of the buffer (with respect to the total width and height of the buffer) in a drawing plane just in front of snip. If snip is null, then snip is inserted behind all other snips.
Inserts a snip into the buffer. A snip cannot be inserted into multiple buffers or multiple times within a single buffer.