react-native-reanimated/lib/module/common/web/utils/colors.js

More powerful alternative to Animated library for React Native.

'use strict';

import { processColorInitially } from '../../../Colors';
export function opacifyColor(color, opacity) {
  'worklet';

  const colorNumber = processColorInitially(color);
  if (!colorNumber) {
    return colorNumber === 0x00000000 ? 'transparent' : null;
  }
  const a = colorNumber >> 24 & 0xff;
  const r = colorNumber >> 16 & 0xff;
  const g = colorNumber >> 8 & 0xff;
  const b = colorNumber & 0xff;

  // Combine the existing alpha with the new opacity
  const newAlpha = a / 255 * opacity;
  return `rgba(${r}, ${g}, ${b}, ${newAlpha})`;
}
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