pixi.js/lib/rendering/renderers/gl/texture/utils/unpremultiplyAlpha.js

PixiJS — The HTML5 Creation Engine =============

'use strict';

"use strict";
function unpremultiplyAlpha(pixels) {
  if (pixels instanceof Uint8ClampedArray) {
    pixels = new Uint8Array(pixels.buffer);
  }
  const n = pixels.length;
  for (let i = 0; i < n; i += 4) {
    const alpha = pixels[i + 3];
    if (alpha !== 0) {
      const a = 255.001 / alpha;
      pixels[i] = pixels[i] * a + 0.5;
      pixels[i + 1] = pixels[i + 1] * a + 0.5;
      pixels[i + 2] = pixels[i + 2] * a + 0.5;
    }
  }
}

exports.unpremultiplyAlpha = unpremultiplyAlpha;
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