41 lines
1.1 KiB
JavaScript
41 lines
1.1 KiB
JavaScript
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @providesModule processColor
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* @flow
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*/
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'use strict';
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const Platform = require('Platform');
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const normalizeColor = require('normalizeColor');
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/* eslint no-bitwise: 0 */
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function processColor(color?: string | number): ?number {
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if (color === undefined || color === null) {
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return color;
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}
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let int32Color = normalizeColor(color);
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if (int32Color === null || int32Color === undefined) {
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return undefined;
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}
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// Converts 0xrrggbbaa into 0xaarrggbb
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int32Color = (int32Color << 24 | int32Color >>> 8) >>> 0;
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if (Platform.OS === 'android') {
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// Android use 32 bit *signed* integer to represent the color
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// We utilize the fact that bitwise operations in JS also operates on
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// signed 32 bit integers, so that we can use those to convert from
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// *unsigned* to *signed* 32bit int that way.
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int32Color = int32Color | 0x0;
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}
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return int32Color;
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}
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module.exports = processColor;
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