Use value-type values for some of DrawImageOption's members

ebitenutil/debugprint.go

@@ -58,11 +58,10 @@ func (d *debugPrintState) drawText(rt *ebiten.Image, str string, x, y int, c col
 	g := float64(cc.G) / math.MaxUint16
 	b := float64(cc.B) / math.MaxUint16
 	a := float64(cc.A) / math.MaxUint16
-	clr := ebiten.ScaleColor(r, g, b, a)
 	rt.DrawImageAt(d.textImage, x+1, y, &ebiten.DrawImageOptions{
 		DstParts:    dsts,
 		SrcParts:    srcs,
-		ColorMatrix: &clr,
+		ColorMatrix: ebiten.ScaleColor(r, g, b, a),
 	})
 }
 

example/alphablending/main.go

@@ -49,9 +49,8 @@ func update(screen *ebiten.Image) error {
 		return err
 	}
 	for i := 0; i < 10; i++ {
-		clr := ebiten.ScaleColor(1.0, 1.0, 1.0, 0.5)
 		op := &ebiten.DrawImageOptions{
-			ColorMatrix: &clr,
+			ColorMatrix: ebiten.ScaleColor(1.0, 1.0, 1.0, 0.5),
 		}
 		if err := tmpRenderTarget.DrawImageAt(ebitenImage, 15+int(float64(i)*diff), 20, op); err != nil {
 			return err

example/blocks/blocks/font.go

@@ -63,8 +63,8 @@ func drawText(rt *ebiten.Image, images *Images, str string, ox, oy, scale int, c
 	rt.DrawImage(fontImageId, &ebiten.DrawImageOptions{
 		DstParts:       dsts,
 		SrcParts:       srcs,
-		GeometryMatrix: &geo,
-		ColorMatrix:    &clr,
+		GeometryMatrix: geo,
+		ColorMatrix:    clr,
 	})
 }
 

example/blocks/blocks/gamescene.go

@@ -114,10 +114,9 @@ func (s *GameScene) Draw(r *ebiten.Image, images *Images) {
 	w, h := field.Size()
 	geo := ebiten.ScaleGeometry(float64(fieldWidth)/float64(w), float64(fieldHeight)/float64(h))
 	geo.Concat(ebiten.TranslateGeometry(20, 20)) // TODO: magic number?
-	clr := ebiten.ScaleColor(0.0, 0.0, 0.0, 0.5)
 	r.DrawImage(field, &ebiten.DrawImageOptions{
-		GeometryMatrix: &geo,
-		ColorMatrix:    &clr,
+		GeometryMatrix: geo,
+		ColorMatrix:    ebiten.ScaleColor(0.0, 0.0, 0.0, 0.5),
 	})
 
 	s.field.Draw(r, images, 20, 20)

example/blocks/blocks/scenemanager.go

@@ -74,9 +74,8 @@ func (s *SceneManager) Draw(r *ebiten.Image, images *Images) {
 	r.DrawImage(from, nil)
 
 	alpha := float64(s.transitionCount) / float64(transitionMaxCount)
-	clr := ebiten.ScaleColor(1, 1, 1, alpha)
 	op := &ebiten.DrawImageOptions{
-		ColorMatrix: &clr,
+		ColorMatrix: ebiten.ScaleColor(1, 1, 1, alpha),
 	}
 	r.DrawImage(to, op)
 }

example/mosaic/main.go

@@ -34,14 +34,11 @@ var (
 )
 
 func update(screen *ebiten.Image) error {
-	geo := ebiten.ScaleGeometry(1.0/mosaicRatio, 1.0/mosaicRatio)
 	gophersRenderTarget.DrawImage(gophersImage, &ebiten.DrawImageOptions{
-		GeometryMatrix: &geo,
+		GeometryMatrix: ebiten.ScaleGeometry(1.0/mosaicRatio, 1.0/mosaicRatio),
 	})
-
-	geo = ebiten.ScaleGeometry(mosaicRatio, mosaicRatio)
 	screen.DrawImage(gophersRenderTarget, &ebiten.DrawImageOptions{
-		GeometryMatrix: &geo,
+		GeometryMatrix: ebiten.ScaleGeometry(mosaicRatio, mosaicRatio),
 	})
 	return nil
 }

example/paint/main.go

@@ -46,7 +46,7 @@ func Update(screen *ebiten.Image) error {
 		theta := 2.0 * math.Pi * float64(count%60) / 60.0
 		clr.Concat(ebiten.RotateHue(theta))
 		canvasRenderTarget.DrawImageAt(brushRenderTarget, mx, my, &ebiten.DrawImageOptions{
-			ColorMatrix: &clr,
+			ColorMatrix: clr,
 		})
 	}
 

example/perspective/main.go

@@ -46,7 +46,7 @@ func update(screen *ebiten.Image) error {
 	screen.DrawImage(gophersImage, &ebiten.DrawImageOptions{
 		DstParts:       dsts,
 		SrcParts:       srcs,
-		GeometryMatrix: &geo,
+		GeometryMatrix: geo,
 	})
 	return nil
 }

example/rotate/main.go

@@ -57,7 +57,7 @@ func update(screen *ebiten.Image) error {
 	geo.Concat(ebiten.RotateGeometry(float64(count%720) * 2 * math.Pi / 720))
 	geo.Concat(ebiten.TranslateGeometry(screenWidth/2, screenHeight/2))
 	if err := screen.DrawImage(gophersImage, &ebiten.DrawImageOptions{
-		GeometryMatrix: &geo,
+		GeometryMatrix: geo,
 	}); err != nil {
 		return err
 	}

graphicscontext.go

@@ -66,11 +66,8 @@ func (c *graphicsContext) postUpdate() error {
 	}
 
 	scale := float64(c.screenScale)
-	geo := ScaleGeometry(scale, scale)
-	clr := NewColorMatrix()
 	option := &DrawImageOptions{
-		GeometryMatrix: &geo,
-		ColorMatrix:    &clr,
+		GeometryMatrix: ScaleGeometry(scale, scale),
 	}
 	if err := c.defaultR.drawImage(c.screen, option); err != nil {
 		return err

image.go

@@ -68,15 +68,7 @@ func (i *innerImage) drawImage(img *innerImage, options *DrawImageOptions) error
 		}
 	}
 	geo := options.GeometryMatrix
-	if geo == nil {
-		i := NewGeometryMatrix()
-		geo = &i
-	}
 	clr := options.ColorMatrix
-	if clr == nil {
-		i := NewColorMatrix()
-		clr = &i
-	}
 
 	if err := i.framebuffer.SetAsViewport(); err != nil {
 		return err
@@ -176,12 +168,7 @@ func (i *Image) DrawImageAt(image *Image, x, y int, options *DrawImageOptions) (
 	if options == nil {
 		options = &DrawImageOptions{}
 	}
-	if options.GeometryMatrix == nil {
-		geo := TranslateGeometry(float64(x), float64(y))
-		options.GeometryMatrix = &geo
-	} else {
 	options.GeometryMatrix.Concat(TranslateGeometry(float64(x), float64(y)))
-	}
 	return i.drawImage(image.inner, options)
 }
 
@@ -228,6 +215,6 @@ func (i *Image) At(x, y int) color.Color {
 type DrawImageOptions struct {
 	DstParts       []image.Rectangle
 	SrcParts       []image.Rectangle
-	GeometryMatrix *GeometryMatrix
-	ColorMatrix    *ColorMatrix
+	GeometryMatrix GeometryMatrix
+	ColorMatrix    ColorMatrix
 }