68 lines
1.7 KiB
JavaScript
68 lines
1.7 KiB
JavaScript
|
/**
|
||
|
|
* @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( './../../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;
|