impl_js.go (955B)
1 // Copyright 2018 The Ebiten Authors 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 package devicescale 16 17 import ( 18 "syscall/js" 19 ) 20 21 func impl(x, y int) float64 { 22 if go2cpp := js.Global().Get("go2cpp"); go2cpp.Truthy() { 23 return go2cpp.Get("devicePixelRatio").Float() 24 } 25 26 window := js.Global().Get("window") 27 if !window.Truthy() { 28 return 1 29 } 30 ratio := window.Get("devicePixelRatio").Float() 31 if ratio == 0 { 32 ratio = 1 33 } 34 return ratio 35 }