4 * Copyright 2016 RIFT.IO Inc
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
10 * http://www.apache.org/licenses/LICENSE-2.0
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
20 export default function zoomFactor(element
= document
.body
) {
22 const rect
= element
.getBoundingClientRect();
23 const physicalW
= rect
.right
- rect
.left
;
24 const logicalW
= element
.offsetWidth
;
25 factor
= Math
.round((physicalW
/ logicalW
) * 100) / 100;
26 // if fullscreen mode offsetWidth is 0