ebiten/internal/devicescale/impl_desktop.go

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// Copyright 2021 The Ebiten Authors
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//
// 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.
//go:build !android && !ios && !js
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package devicescale
import (
"github.com/hajimehoshi/ebiten/v2/internal/glfw"
)
func monitorAt(x, y int) *glfw.Monitor {
// Note: this assumes that x, y are exact monitor origins.
// If they're not, this arbitrarily returns the first monitor.
monitors := glfw.GetMonitors()
for _, mon := range monitors {
mx, my := mon.GetPos()
if x == mx && y == my {
return mon
}
}
return monitors[0]
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}
func impl(x, y int) float64 {
// Keep calling GetContentScale until the returned scale is 0 (#2051).
// Retry this at most 5 times to avoid an infinite loop.
for i := 0; i < 5; i++ {
// An error can happen e.g. when entering a screensaver on Windows (#2488).
sx, _, err := monitorAt(x, y).GetContentScale()
if err != nil {
continue
}
if sx == 0 {
continue
}
return float64(sx)
}
return 1
}