diff --git a/image.go b/image.go
index c51ca2b2c..92a8cc0c8 100644
--- a/image.go
+++ b/image.go
@@ -23,7 +23,6 @@ import (
 
 	"github.com/hajimehoshi/ebiten/internal/driver"
 	"github.com/hajimehoshi/ebiten/internal/graphics"
-	"github.com/hajimehoshi/ebiten/internal/shareable"
 )
 
 var (
@@ -748,9 +747,8 @@ type DrawImageOptions struct {
 //
 // Error returned by NewImage is always nil as of 1.5.0-alpha.
 func NewImage(width, height int, filter Filter) (*Image, error) {
-	s := shareable.NewImage(width, height)
 	i := &Image{
-		mipmap: newMipmap(s),
+		mipmap: newMipmap(width, height),
 		filter: filter,
 	}
 	i.addr = i
@@ -780,7 +778,7 @@ func (i *Image) makeVolatile() {
 	if i.isDisposed() {
 		return
 	}
-	i.mipmap.orig.MakeVolatile()
+	i.mipmap.makeVolatile()
 	i.disposeMipmaps()
 }
 
@@ -797,9 +795,8 @@ func NewImageFromImage(source image.Image, filter Filter) (*Image, error) {
 
 	width, height := size.X, size.Y
 
-	s := shareable.NewImage(width, height)
 	i := &Image{
-		mipmap: newMipmap(s),
+		mipmap: newMipmap(width, height),
 		filter: filter,
 	}
 	i.addr = i
@@ -810,7 +807,7 @@ func NewImageFromImage(source image.Image, filter Filter) (*Image, error) {
 
 func newScreenFramebufferImage(width, height int) *Image {
 	i := &Image{
-		mipmap: newMipmap(shareable.NewScreenFramebufferImage(width, height)),
+		mipmap: newScreenFramebufferMipmap(width, height),
 		filter: FilterDefault,
 	}
 	i.addr = i
diff --git a/imagedumper_desktop.go b/imagedumper_desktop.go
index 5d90b5733..94e4012ee 100644
--- a/imagedumper_desktop.go
+++ b/imagedumper_desktop.go
@@ -52,7 +52,7 @@ func takeScreenshot(screen *Image) error {
 		return err
 	}
 
-	if err := screen.mipmap.orig.Dump(newname); err != nil {
+	if err := screen.mipmap.dump(newname); err != nil {
 		return err
 	}
 
diff --git a/mipmap.go b/mipmap.go
index 3448fdfb3..7b4d8d29a 100644
--- a/mipmap.go
+++ b/mipmap.go
@@ -31,9 +31,16 @@ type mipmap struct {
 	imgs map[image.Rectangle]levelToImage
 }
 
-func newMipmap(s *shareable.Image) *mipmap {
+func newMipmap(width, height int) *mipmap {
 	return &mipmap{
-		orig: s,
+		orig: shareable.NewImage(width, height),
+		imgs: map[image.Rectangle]levelToImage{},
+	}
+}
+
+func newScreenFramebufferMipmap(width, height int) *mipmap {
+	return &mipmap{
+		orig: shareable.NewScreenFramebufferImage(width, height),
 		imgs: map[image.Rectangle]levelToImage{},
 	}
 }
@@ -42,6 +49,14 @@ func (m *mipmap) original() *shareable.Image {
 	return m.orig
 }
 
+func (m *mipmap) makeVolatile() {
+	m.orig.MakeVolatile()
+}
+
+func (m *mipmap) dump(name string) error {
+	return m.orig.Dump(name)
+}
+
 func (m *mipmap) level(r image.Rectangle, level int) *shareable.Image {
 	if level == 0 {
 		panic("ebiten: level must be non-zero at level")