graphics: Remove GraphicsContext.Invalidated

graphicscontext.go

@@ -45,19 +45,10 @@ type graphicsContext struct {
 	screenHeight int
 	screenScale  float64
 	initialized  bool
-	invalidated  bool // browser only
 	offsetX      float64
 	offsetY      float64
 }
 
-func (c *graphicsContext) Invalidate() {
-	// Note that this is called only on browsers so far.
-	// TODO: On mobiles, this function is not called and instead IsTexture is called
-	// to detect if the context is lost. This is simple but might not work on some platforms.
-	// Should Invalidate be called explicitly?
-	c.invalidated = true
-}
-
 func (c *graphicsContext) SetSize(screenWidth, screenHeight int, screenScale float64) {
 	c.screenScale = screenScale
 
@@ -180,6 +171,5 @@ func (c *graphicsContext) restoreIfNeeded() error {
 	if err := shareable.Restore(); err != nil {
 		return err
 	}
-	c.invalidated = false
 	return nil
 }

internal/ui/ui.go

@@ -21,7 +21,6 @@ import (
 type GraphicsContext interface {
 	SetSize(width, height int, scale float64)
 	Update(afterFrameUpdate func()) error
-	Invalidate()
 }
 
 // RegularTermination represents a regular termination.