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* @license Apache-2.0
*
* Copyright (c) 2018 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
// MODULES //
var isUint8ClampedArray = require( '@stdlib/assert/is-uint8clampedarray' );
var GlobalUint8ClampedArray = require( './uint8clampedarray.js' );
// MAIN //
/**
* Tests for native `Uint8ClampedArray` support.
*
* @returns {boolean} boolean indicating if an environment has `Uint8ClampedArray` support
*
* @example
* var bool = hasUint8ClampedArraySupport();
* // returns <boolean>
*/
function hasUint8ClampedArraySupport() { // eslint-disable-line id-length
var bool;
var arr;
if ( typeof GlobalUint8ClampedArray !== 'function' ) {
return false;
}
// Test basic support...
try {
arr = new GlobalUint8ClampedArray( [ -1, 0, 1, 3.14, 4.99, 255, 256 ] );
bool = (
isUint8ClampedArray( arr ) &&
arr[ 0 ] === 0 && // clamped
arr[ 1 ] === 0 &&
arr[ 2 ] === 1 &&
arr[ 3 ] === 3 && // round to nearest
arr[ 4 ] === 5 && // round to nearest
arr[ 5 ] === 255 &&
arr[ 6 ] === 255 // clamped
);
} catch ( err ) { // eslint-disable-line no-unused-vars
bool = false;
}
return bool;
}
// EXPORTS //
module.exports = hasUint8ClampedArraySupport;
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