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• .. (вверх)
• [DIR] ..
• [FILE] bitmapper.js
• [FILE] bitpacker.js
• [FILE] chunkstream.js
• [FILE] constants.js
• [FILE] crc.js
• [FILE] filter-pack.js
• [FILE] filter-parse-async.js
• [FILE] filter-parse-sync.js
• [FILE] filter-parse.js
• [FILE] format-normaliser.js
• [FILE] interlace.js
• [FILE] packer-async.js
• [FILE] packer-sync.js
• [FILE] packer.js
• [FILE] paeth-predictor.js
• [FILE] parser-async.js
• [FILE] parser-sync.js
• [FILE] parser.js
• [FILE] png-sync.js
• [FILE] png.js
• [FILE] sync-inflate.js
• [FILE] sync-reader.js

Просмотр файла: paeth-predictor.js

'use strict';

module.exports = function paethPredictor(left, above, upLeft) {

  var paeth = left + above - upLeft;
  var pLeft = Math.abs(paeth - left);
  var pAbove = Math.abs(paeth - above);
  var pUpLeft = Math.abs(paeth - upLeft);

  if (pLeft <= pAbove && pLeft <= pUpLeft) {
    return left;
  }
  if (pAbove <= pUpLeft) {
    return above;
  }
  return upLeft;
};

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