@amaui/utils/esm/canvasFilterInvert.js

Utils

import clamp from './clamp';

const canvasFilterInvert = (value, canvas) => {
  const context = canvas.getContext('2d');
  const imageData = context.getImageData(0, 0, canvas.width, canvas.height);
  const {
    data
  } = imageData;

  for (let i = 0; i < data.length; i += 4) {
    data[i + 0] = clamp(255 - data[i + 0], 0, 255);
    data[i + 1] = clamp(255 - data[i + 1], 0, 255);
    data[i + 2] = clamp(255 - data[i + 2], 0, 255);
  }

  context.putImageData(imageData, 0, 0);
  return canvas;
};

export default canvasFilterInvert;