62 lines
1.1 KiB
Go
62 lines
1.1 KiB
Go
package glfw
|
|
|
|
import (
|
|
"math"
|
|
"os"
|
|
"strconv"
|
|
|
|
"fyne.io/fyne/v2"
|
|
)
|
|
|
|
const (
|
|
baselineDPI = 120.0
|
|
scaleEnvKey = "FYNE_SCALE"
|
|
scaleAuto = float32(-1.0) // some platforms allow setting auto-scale (linux/BSD)
|
|
)
|
|
|
|
func calculateDetectedScale(widthMm, widthPx int) float32 {
|
|
dpi := float32(widthPx) / (float32(widthMm) / 25.4)
|
|
if dpi > 1000 || dpi < 10 {
|
|
dpi = baselineDPI
|
|
}
|
|
|
|
scale := float32(float64(dpi) / baselineDPI)
|
|
if scale < 1.0 {
|
|
return 1.0
|
|
}
|
|
return scale
|
|
}
|
|
|
|
func calculateScale(user, system, detected float32) float32 {
|
|
if user < 0 {
|
|
user = 1.0
|
|
}
|
|
|
|
if system == scaleAuto {
|
|
system = detected
|
|
}
|
|
|
|
raw := system * user
|
|
return float32(math.Round(float64(raw*10.0))) / 10.0
|
|
}
|
|
|
|
func userScale() float32 {
|
|
env := os.Getenv(scaleEnvKey)
|
|
|
|
if env != "" && env != "auto" {
|
|
scale, err := strconv.ParseFloat(env, 32)
|
|
if err == nil && scale != 0 {
|
|
return float32(scale)
|
|
}
|
|
fyne.LogError("Error reading scale", err)
|
|
}
|
|
|
|
if env != "auto" {
|
|
if setting := fyne.CurrentApp().Settings().Scale(); setting > 0 {
|
|
return setting
|
|
}
|
|
}
|
|
|
|
return 1.0 // user preference for auto is now passed as 1 so the system auto is picked up
|
|
}
|