pixi.js
Version:
PixiJS — The HTML5 Creation Engine =============
20 lines (18 loc) • 521 B
JavaScript
;
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;
}
}
}
export { unpremultiplyAlpha };
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