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 tinycolor = require('tinycolor');
var Platform = require('Platform');
/* eslint no-bitwise: 0 */
function processColor(color) {
if (!color || typeof color === 'number') {
return color;
} else if (color instanceof Array) {
return color.map(processColor);
} else {
var color = tinycolor(color);
if (color.isValid()) {
var rgb = color.toRgb();
// All bitwise operations happen on 32-bit numbers, so we shift the 1 first
// then multiply it with the actual value.
var colorInt = Math.round(rgb.a * 255) * (1 << 24) + rgb.r * (1 << 16) + rgb.g * (1 << 8) + rgb.b;
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
// *unsiged* to *signed* 32bit int that way.
colorInt = colorInt | 0x0;
}
return colorInt;
}
return 0;
}
}
module.exports = processColor;