internal/ui: refactoring: remove sizeChanged

It is safe to call Layout every frame.

internal/ui/ui_mobile.go

@@ -58,7 +58,6 @@ var (
 		// Give a default outside size so that the game can start without initializing them.
 		outsideWidth:  640,
 		outsideHeight: 480,
-		sizeChanged:   true,
 	}
 )
 
@@ -99,7 +98,6 @@ type UserInterface struct {
 	outsideWidth  float64
 	outsideHeight float64
 
-	sizeChanged bool
 	foreground int32
 	errCh      chan error
 
@@ -273,10 +271,6 @@ func (u *UserInterface) run(game Game, mainloop bool) (err error) {
 		}
 	}()
 
-	u.m.Lock()
-	u.sizeChanged = true
-	u.m.Unlock()
-
 	u.context = newContextImpl(game)
 
 	if mainloop {
@@ -306,8 +300,6 @@ func (u *UserInterface) layoutIfNeeded() {
 	var outsideWidth, outsideHeight float64
 
 	u.m.RLock()
-	sizeChanged := u.sizeChanged
-	if sizeChanged {
 	if u.gbuildWidthPx == 0 || u.gbuildHeightPx == 0 {
 		outsideWidth = u.outsideWidth
 		outsideHeight = u.outsideHeight
@@ -317,14 +309,10 @@ func (u *UserInterface) layoutIfNeeded() {
 		outsideWidth = float64(u.gbuildWidthPx) / d
 		outsideHeight = float64(u.gbuildHeightPx) / d
 	}
-	}
-	u.sizeChanged = false
 	u.m.RUnlock()
 
-	if sizeChanged {
 	u.context.layout(outsideWidth, outsideHeight)
 }
-}
 
 func (u *UserInterface) update() error {
 	<-renderCh
@@ -353,7 +341,6 @@ func (u *UserInterface) SetOutsideSize(outsideWidth, outsideHeight float64) {
 	if u.outsideWidth != outsideWidth || u.outsideHeight != outsideHeight {
 		u.outsideWidth = outsideWidth
 		u.outsideHeight = outsideHeight
-		u.sizeChanged = true
 	}
 	u.m.Unlock()
 }
@@ -362,7 +349,6 @@ func (u *UserInterface) setGBuildSize(widthPx, heightPx int) {
 	u.m.Lock()
 	u.gbuildWidthPx = widthPx
 	u.gbuildHeightPx = heightPx
-	u.sizeChanged = true
 	u.m.Unlock()
 
 	u.once.Do(func() {