diff --git a/image.go b/image.go
index 93a1ec85d..e45855b28 100644
--- a/image.go
+++ b/image.go
@@ -764,7 +764,7 @@ func (i *Image) Set(x, y int, clr color.Color) {
 
 	r, g, b, a := clr.RGBA()
 	pix := []byte{byte(r >> 8), byte(g >> 8), byte(b >> 8), byte(a >> 8)}
-	if err := i.image.ReplaceSmallAreaPixels(pix, x, y, 1, 1); err != nil {
+	if err := i.image.ReplaceSmallRegionPixels(pix, x, y, 1, 1); err != nil {
 		ui.SetError(err)
 	}
 }
@@ -815,8 +815,8 @@ func (i *Image) ReplacePixels(pixels []byte) {
 
 	// Do not need to copy pixels here.
 	// * In internal/mipmap, pixels are copied when necessary.
-	// * In internal/shareable, pixels are copied to make its paddings.
-	if err := i.image.ReplaceLargeAreaPixels(pixels, r.Min.X, r.Min.Y, r.Dx(), r.Dy()); err != nil {
+	// * In internal/atlas, pixels are copied to make its paddings.
+	if err := i.image.ReplaceLargeRegionPixels(pixels, r.Min.X, r.Min.Y, r.Dx(), r.Dy()); err != nil {
 		ui.SetError(err)
 	}
 }
diff --git a/internal/buffered/image.go b/internal/buffered/image.go
index dcea25c18..14159d3cb 100644
--- a/internal/buffered/image.go
+++ b/internal/buffered/image.go
@@ -166,7 +166,10 @@ func (i *Image) DumpScreenshot(graphicsDriver graphicsdriver.Graphics, name stri
 	return i.img.DumpScreenshot(graphicsDriver, name, blackbg)
 }
 
-func (i *Image) ReplaceLargeAreaPixels(pix []byte, x, y, width, height int) error {
+// ReplaceLargeRegionPixels replaces the pixels with the specified region.
+// ReplaceLargeRegionPixels is used for a relatively large region.
+// This call is not accumulated and send one draw call to replace pixels.
+func (i *Image) ReplaceLargeRegionPixels(pix []byte, x, y, width, height int) error {
 	if l := 4 * width * height; len(pix) != l {
 		panic(fmt.Sprintf("buffered: len(pix) was %d but must be %d", len(pix), l))
 	}
@@ -175,7 +178,7 @@ func (i *Image) ReplaceLargeAreaPixels(pix []byte, x, y, width, height int) erro
 		copied := make([]byte, len(pix))
 		copy(copied, pix)
 		if tryAddDelayedCommand(func() error {
-			i.ReplaceLargeAreaPixels(copied, x, y, width, height)
+			i.ReplaceLargeRegionPixels(copied, x, y, width, height)
 			return nil
 		}) {
 			return nil
@@ -188,7 +191,10 @@ func (i *Image) ReplaceLargeAreaPixels(pix []byte, x, y, width, height int) erro
 	return nil
 }
 
-func (i *Image) ReplaceSmallAreaPixels(graphicsDriver graphicsdriver.Graphics, pix []byte, x, y, width, height int) error {
+// ReplaceSmallRegionPixels replaces the pixels with the specified region.
+// ReplaceSmallRegionPixels is used for a relatively small region.
+// This call might be accumulated and send one draw call to replace pixels for the accumulated calls.
+func (i *Image) ReplaceSmallRegionPixels(graphicsDriver graphicsdriver.Graphics, pix []byte, x, y, width, height int) error {
 	if l := 4 * width * height; len(pix) != l {
 		panic(fmt.Sprintf("buffered: len(pix) was %d but must be %d", len(pix), l))
 	}
@@ -197,7 +203,7 @@ func (i *Image) ReplaceSmallAreaPixels(graphicsDriver graphicsdriver.Graphics, p
 		copied := make([]byte, len(pix))
 		copy(copied, pix)
 		if tryAddDelayedCommand(func() error {
-			i.ReplaceSmallAreaPixels(graphicsDriver, copied, x, y, width, height)
+			i.ReplaceSmallRegionPixels(graphicsDriver, copied, x, y, width, height)
 			return nil
 		}) {
 			return nil
diff --git a/internal/mipmap/mipmap.go b/internal/mipmap/mipmap.go
index 899bab926..966a86bcf 100644
--- a/internal/mipmap/mipmap.go
+++ b/internal/mipmap/mipmap.go
@@ -71,16 +71,16 @@ func (m *Mipmap) DumpScreenshot(graphicsDriver graphicsdriver.Graphics, name str
 	return m.orig.DumpScreenshot(graphicsDriver, name, blackbg)
 }
 
-func (m *Mipmap) ReplaceLargeAreaPixels(pix []byte, x, y, width, height int) error {
-	if err := m.orig.ReplaceLargeAreaPixels(pix, x, y, width, height); err != nil {
+func (m *Mipmap) ReplaceLargeRegionPixels(pix []byte, x, y, width, height int) error {
+	if err := m.orig.ReplaceLargeRegionPixels(pix, x, y, width, height); err != nil {
 		return err
 	}
 	m.disposeMipmaps()
 	return nil
 }
 
-func (m *Mipmap) ReplaceSmallAreaPixels(graphicsDriver graphicsdriver.Graphics, pix []byte, x, y, width, height int) error {
-	if err := m.orig.ReplaceSmallAreaPixels(graphicsDriver, pix, x, y, width, height); err != nil {
+func (m *Mipmap) ReplaceSmallRegionPixels(graphicsDriver graphicsdriver.Graphics, pix []byte, x, y, width, height int) error {
+	if err := m.orig.ReplaceSmallRegionPixels(graphicsDriver, pix, x, y, width, height); err != nil {
 		return err
 	}
 	m.disposeMipmaps()
diff --git a/internal/ui/image.go b/internal/ui/image.go
index 40f059603..4686dbb37 100644
--- a/internal/ui/image.go
+++ b/internal/ui/image.go
@@ -60,12 +60,12 @@ func (i *Image) DrawTriangles(srcs [graphics.ShaderImageNum]*Image, vertices []f
 	i.mipmap.DrawTriangles(srcMipmaps, vertices, indices, colorm, mode, filter, address, dstRegion, srcRegion, subimageOffsets, s, uniforms, evenOdd, canSkipMipmap)
 }
 
-func (i *Image) ReplaceLargeAreaPixels(pix []byte, x, y, width, height int) error {
-	return i.mipmap.ReplaceLargeAreaPixels(pix, x, y, width, height)
+func (i *Image) ReplaceLargeRegionPixels(pix []byte, x, y, width, height int) error {
+	return i.mipmap.ReplaceLargeRegionPixels(pix, x, y, width, height)
 }
 
-func (i *Image) ReplaceSmallAreaPixels(pix []byte, x, y, width, height int) error {
-	return i.mipmap.ReplaceSmallAreaPixels(graphicsDriver(), pix, x, y, width, height)
+func (i *Image) ReplaceSmallRegionPixels(pix []byte, x, y, width, height int) error {
+	return i.mipmap.ReplaceSmallRegionPixels(graphicsDriver(), pix, x, y, width, height)
 }
 
 func (i *Image) Pixels(x, y, width, height int) ([]byte, error) {