app/internal/window: correct baseline DPI on Windows, iOS

Updates gio#53

Signed-off-by: Elias Naur <mail@eliasnaur.com>

app/internal/window/os_android.go

@@ -309,6 +309,7 @@ func (w *window) draw(sync bool) {
 	if width == 0 || height == 0 {
 		return
 	}
+	const inchPrDp = 1.0 / 160
 	ppdp := float32(w.dpi) * inchPrDp
 	w.callbacks.Event(FrameEvent{
 		FrameEvent: system.FrameEvent{

app/internal/window/os_ios.go

@@ -81,6 +81,7 @@ func onDraw(view C.CFTypeRef, dpi, sdpi, width, height C.CGFloat, sync C.int, to
 	if sync != 0 {
 		isSync = true
 	}
+	const inchPrDp = 1.0 / 163
 	w.w.Event(FrameEvent{
 		FrameEvent: system.FrameEvent{
 			Size: image.Point{

app/internal/window/os_windows.go

@@ -486,6 +486,7 @@ func convertKeyCode(code uintptr) (rune, bool) {
 func configForDC(hdc syscall.Handle) config {
 	hmon := monitorFromPoint(point{}, _MONITOR_DEFAULTTOPRIMARY)
 	dpi := getDpiForMonitor(hmon, _MDT_EFFECTIVE_DPI)
+	const inchPrDp = 1.0 / 96.0
 	ppdp := float32(dpi) * inchPrDp
 	return config{
 		pxPerDp: ppdp,

app/internal/window/window.go

@@ -106,7 +106,3 @@ func newWindowRendezvous() *windowRendezvous {
 	}()
 	return wr
 }
-
-const (
-	inchPrDp = 1.0 / 160
-)