Module entropy_coding 

Entropy coding for JPEG XL encoder.

This module provides ANS (Asymmetric Numeral Systems) and Huffman encoding implementations for compressing symbols in the JXL bitstream.

Re-exports

pub use ans::ANS_LOG_TAB_SIZE;

pub use ans::ANS_MAX_ALPHABET_SIZE;

pub use ans::ANS_SIGNATURE;

pub use ans::ANS_TAB_MASK;

pub use ans::ANS_TAB_SIZE;

pub use ans::ANSEncodingHistogram;

pub use ans::ANSHistogramStrategy;

pub use ans::AnsEncoder;

pub use ans::get_population_count_precision;

pub use histogram::HISTOGRAM_ROUNDING;

pub use histogram::Histogram;

pub use histogram::MIN_DISTANCE_FOR_DISTINCT;

pub use histogram::histogram_distance;

pub use histogram::histogram_kl_divergence;

Modules

ans

ANS (Asymmetric Numeral Systems) encoder.

ans_decode

histogram

Histogram data structure with entropy calculations.

Structs

ClusterResult

Result of clustering histograms.

HuffmanTable

Result of building a Huffman table.

Enums

ClusteringType

Clustering aggressiveness level.

EntropyType

Entropy coding method - affects header cost estimation for clustering.

Lz77Method

LZ77 method selection.

Functions

build_and_store_huffman_tree

Builds and stores a Huffman table from a histogram.

cluster_histograms

Full clustering pipeline.

convert_bit_depths_to_symbols

Converts code depths to canonical Huffman codes.

create_huffman_tree

Creates an optimal Huffman tree from symbol frequencies.

encode_context_map

Encode context map to bitstream.

fast_cluster_histograms

Fast k-means-like clustering.

inverse_move_to_front_transform

Inverse move-to-front transform (for testing).

move_to_front_transform

Move-to-front transform for better compression.

store_huffman_tree

Stores a full Huffman tree to the bitstream.

write_huffman_tree

Compresses a depth array into RLE-encoded code length codes.