Reshape

The Reshape transform modifies the Layout metadata of a plane without altering the underlying byte array.

Theory

Certain downstream codecs (like the row-aware Order-1 Scale AC) require the plane to have a specific shape, such as a Rows layout with a particular row_len.

The Reshape operation converts a Flat layout into a structured Rows layout (provided the total length is perfectly divisible by the row length), or conversely collapses a Rows layout back into a Flat one.

Inverse

Because no bytes are actually moved or modified, the inverse of Reshape is a pass-through of the bytes, with the original layout context restored automatically by the preceding node in the inverse Preprocessing Graph.