mirror of
https://github.com/tvytlx/ai-agent-deep-dive.git
synced 2026-04-04 16:14:50 +08:00
17 lines
372 B
JavaScript
17 lines
372 B
JavaScript
"use strict";
|
|
|
|
module.exports = function paethPredictor(left, above, upLeft) {
|
|
let paeth = left + above - upLeft;
|
|
let pLeft = Math.abs(paeth - left);
|
|
let pAbove = Math.abs(paeth - above);
|
|
let pUpLeft = Math.abs(paeth - upLeft);
|
|
|
|
if (pLeft <= pAbove && pLeft <= pUpLeft) {
|
|
return left;
|
|
}
|
|
if (pAbove <= pUpLeft) {
|
|
return above;
|
|
}
|
|
return upLeft;
|
|
};
|