Module scan 

JPEG scan data encoding and decoding.

Decodes entropy-coded scan data into DctGrids (one per component) and re-encodes modified grids back to entropy-coded bytes. Handles interleaved MCU ordering, restart markers, and DC prediction.

Structs

ScanComponent

Component selector for one scan component.

Constants

JPEG_WRITE_STEPS

Encode scan data with optional per-row progress callback.

Functions

decode_progressive_scan

Decode a single progressive scan into existing DctGrids.

decode_scan

Decode the entropy-coded scan data into DctGrids.

encode_scan

Encode DctGrids back to entropy-coded scan data.

encode_scan_with_progress