ebiten: Remove the returning value from (*Image).DrawImage

Updates #1380

ebitenutil/debugprint.go

@@ -78,7 +78,7 @@ func drawDebugText(rt *ebiten.Image, str string, ox, oy int, shadow bool) {
 		op.GeoM.Reset()
 		op.GeoM.Translate(float64(x), float64(y))
 		op.GeoM.Translate(float64(ox+1), float64(oy))
-		_ = rt.DrawImage(s, op)
+		rt.DrawImage(s, op)
 		x += cw
 	}
 }

ebitenutil/shapes.go

@@ -47,7 +47,7 @@ func DrawLine(dst *ebiten.Image, x1, y1, x2, y2 float64, clr color.Color) {
 	op.ColorM = colormcache.ColorToColorM(clr)
 	// Filter must be 'nearest' filter (default).
 	// Linear filtering would make edges blurred.
-	_ = dst.DrawImage(emptyImage, op)
+	dst.DrawImage(emptyImage, op)
 }
 
 // DrawRect draws a rectangle on the given destination dst.
@@ -64,5 +64,5 @@ func DrawRect(dst *ebiten.Image, x, y, width, height float64, clr color.Color) {
 	op.ColorM = colormcache.ColorToColorM(clr)
 	// Filter must be 'nearest' filter (default).
 	// Linear filtering would make edges blurred.
-	_ = dst.DrawImage(emptyImage, op)
+	dst.DrawImage(emptyImage, op)
 }

examples/camera/main.go

@@ -103,8 +103,8 @@ func (c *Camera) worldMatrix() ebiten.GeoM {
 	return m
 }
 
-func (c *Camera) Render(world, screen *ebiten.Image) error {
-	return screen.DrawImage(world, &ebiten.DrawImageOptions{
+func (c *Camera) Render(world, screen *ebiten.Image) {
+	screen.DrawImage(world, &ebiten.DrawImageOptions{
 		GeoM: c.worldMatrix(),
 	})
 }

image.go

@@ -154,16 +154,14 @@ type DrawImageOptions struct {
 // share the texture atlas with high probability.
 //
 // For more performance tips, see https://ebiten.org/documents/performancetips.html
-//
-// DrawImage always returns nil as of 1.5.0.
-func (i *Image) DrawImage(img *Image, options *DrawImageOptions) error {
+func (i *Image) DrawImage(img *Image, options *DrawImageOptions) {
 	i.copyCheck()
 
 	if img.isDisposed() {
 		panic("ebiten: the given image to DrawImage must not be disposed")
 	}
 	if i.isDisposed() {
-		return nil
+		return
 	}
 
 	// TODO: Implement this.
@@ -192,7 +190,6 @@ func (i *Image) DrawImage(img *Image, options *DrawImageOptions) error {
 
 	srcs := [graphics.ShaderImageNum]*mipmap.Mipmap{img.mipmap}
 	i.mipmap.DrawTriangles(srcs, vs, is, options.ColorM.impl, mode, filter, driver.AddressUnsafe, driver.Region{}, [graphics.ShaderImageNum - 1][2]float32{}, nil, nil, canSkipMipmap(options.GeoM, filter))
-	return nil
 }
 
 // Vertex represents a vertex passed to DrawTriangles.

image_test.go

@@ -142,18 +142,9 @@ func TestImageComposition(t *testing.T) {
 		t.Fatal(err)
 		return
 	}
-	if err := img2.DrawImage(img1, nil); err != nil {
-		t.Fatal(err)
-		return
-	}
-	if err := img3.DrawImage(img2, nil); err != nil {
-		t.Fatal(err)
-		return
-	}
-	if err := img_12_3.DrawImage(img3, nil); err != nil {
-		t.Fatal(err)
-		return
-	}
+	img2.DrawImage(img1, nil)
+	img3.DrawImage(img2, nil)
+	img_12_3.DrawImage(img3, nil)
 
 	img2.Fill(img2Color)
 	img3.Fill(img3Color)
@@ -162,18 +153,9 @@ func TestImageComposition(t *testing.T) {
 		t.Fatal(err)
 		return
 	}
-	if err := img3.DrawImage(img2, nil); err != nil {
-		t.Fatal(err)
-		return
-	}
-	if err := img3.DrawImage(img1, nil); err != nil {
-		t.Fatal(err)
-		return
-	}
-	if err := img_1_23.DrawImage(img3, nil); err != nil {
-		t.Fatal(err)
-		return
-	}
+	img3.DrawImage(img2, nil)
+	img3.DrawImage(img1, nil)
+	img_1_23.DrawImage(img3, nil)
 
 	for j := 0; j < h; j++ {
 		for i := 0; i < w; i++ {
@@ -223,10 +205,7 @@ func TestImageScale(t *testing.T) {
 		op := &DrawImageOptions{}
 		op.GeoM.Scale(float64(scale), float64(scale))
 
-		if err := img1.DrawImage(img0, op); err != nil {
-			t.Fatal(err)
-			return
-		}
+		img1.DrawImage(img0, op)
 
 		for j := 0; j < h*scale; j++ {
 			for i := 0; i < w*scale; i++ {
@@ -255,10 +234,7 @@ func TestImage90DegreeRotate(t *testing.T) {
 	op := &DrawImageOptions{}
 	op.GeoM.Rotate(math.Pi / 2)
 	op.GeoM.Translate(float64(h), 0)
-	if err := img1.DrawImage(img0, op); err != nil {
-		t.Fatal(err)
-		return
-	}
+	img1.DrawImage(img0, op)
 
 	for j := 0; j < h; j++ {
 		for i := 0; i < w; i++ {
@@ -286,10 +262,7 @@ func TestImageDotByDotInversion(t *testing.T) {
 	op := &DrawImageOptions{}
 	op.GeoM.Rotate(math.Pi)
 	op.GeoM.Translate(float64(w), float64(h))
-	if err := img1.DrawImage(img0, op); err != nil {
-		t.Fatal(err)
-		return
-	}
+	img1.DrawImage(img0, op)
 
 	for j := 0; j < h; j++ {
 		for i := 0; i < w; i++ {
@@ -411,10 +384,7 @@ func TestImageCompositeModeLighter(t *testing.T) {
 	img1.Fill(color.RGBA{0x01, 0x02, 0x03, 0x04})
 	op := &DrawImageOptions{}
 	op.CompositeMode = CompositeModeLighter
-	if err := img1.DrawImage(img0, op); err != nil {
-		t.Fatal(err)
-		return
-	}
+	img1.DrawImage(img0, op)
 	for j := 0; j < img1.Bounds().Size().Y; j++ {
 		for i := 0; i < img1.Bounds().Size().X; i++ {
 			got := img1.At(i, j).(color.RGBA)

text/text.go

@@ -56,7 +56,7 @@ func drawGlyph(dst *ebiten.Image, face font.Face, r rune, img *ebiten.Image, x,
 	op := &ebiten.DrawImageOptions{}
 	op.GeoM.Translate(float64((x+b.Min.X)>>6), float64((y+b.Min.Y)>>6))
 	op.ColorM = clr
-	_ = dst.DrawImage(img, op)
+	dst.DrawImage(img, op)
 }
 
 var (

uicontext.go

@@ -240,7 +240,7 @@ func (c *uiContext) draw() {
 	} else {
 		op.Filter = FilterLinear
 	}
-	_ = c.screen.DrawImage(c.offscreen, op)
+	c.screen.DrawImage(c.offscreen, op)
 }
 
 func (c *uiContext) AdjustPosition(x, y float64) (float64, float64) {