@raven-js/cortex
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Zero-dependency machine learning, AI, and data processing library for modern JavaScript
27 lines (24 loc) • 892 B
JavaScript
/**
* @author Anonyfox <max@anonyfox.com>
* @license MIT
* @see {@link https://github.com/Anonyfox/ravenjs}
* @see {@link https://ravenjs.dev}
* @see {@link https://anonyfox.com}
*/
/**
* @file JPEG zig-zag index mapping utilities.
*
* Provides the standard 8×8 zig-zag order mapping from serialized index
* to natural [row,col] index, represented as a single Uint8Array of length 64
* that maps zigzagIndex -> naturalIndex (row*8 + col).
*/
/**
* Standard JPEG zig-zag order mapping (zigzag index -> natural index).
* Source: ITU T.81 Annex K.
* @type {Uint8Array}
*/
export const zigZagToNatural = new Uint8Array([
0, 1, 8, 16, 9, 2, 3, 10, 17, 24, 32, 25, 18, 11, 4, 5, 12, 19, 26, 33, 40, 48, 41, 34, 27, 20, 13, 6, 7, 14, 21, 28,
35, 42, 49, 56, 57, 50, 43, 36, 29, 22, 15, 23, 30, 37, 44, 51, 58, 59, 52, 45, 38, 31, 39, 46, 53, 60, 61, 54, 47,
55, 62, 63,
]);