react-native/Libraries/StyleSheet/processColor.js

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/**
* Copyright (c) 2015-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*
* @providesModule processColor
*/
'use strict';
var Platform = require('Platform');
var normalizeColor = require('normalizeColor');
/* eslint no-bitwise: 0 */
function processColor(color) {
if (color === undefined || color === null) {
return color;
}
var int32Color = normalizeColor(color);
if (int32Color === null) {
return undefined;
}
// Converts 0xrrggbbaa into 0xaarrggbb
int32Color = (int32Color << 24 | int32Color >>> 8) >>> 0;
if (Platform.OS === 'android') {
// Android use 32 bit *signed* integer to represent the color
// We utilize the fact that bitwise operations in JS also operates on
// signed 32 bit integers, so that we can use those to convert from
// *unsigned* to *signed* 32bit int that way.
int32Color = int32Color | 0x0;
}
return int32Color;
}
module.exports = processColor;