adopt RGB and Alpha

batch.go

@@ -28,7 +28,7 @@ var _ BasicTarget = (*Batch)(nil)
 func NewBatch(container Triangles, pic Picture) *Batch {
 	b := &Batch{cont: Drawer{Triangles: container, Picture: pic}}
 	b.SetMatrix(IM)
-	b.SetColorMask(RGBA{1, 1, 1, 1})
+	b.SetColorMask(Alpha(1))
 	return b
 }
 
@@ -62,7 +62,7 @@ func (b *Batch) SetMatrix(m Matrix) {
 // SetColorMask sets a mask color used in the following draws onto the Batch.
 func (b *Batch) SetColorMask(c color.Color) {
 	if c == nil {
-		b.col = RGBA{1, 1, 1, 1}
+		b.col = Alpha(1)
 		return
 	}
 	b.col = ToRGBA(c)

data.go

@@ -45,7 +45,7 @@ func (td *TrianglesData) SetLen(len int) {
 				Color     RGBA
 				Picture   Vec
 				Intensity float64
-			}{V(0, 0), RGBA{1, 1, 1, 1}, V(0, 0), 0})
+			}{V(0, 0), Alpha(1), V(0, 0), 0})
 		}
 	}
 	if len < td.Len() {

imdraw/imdraw.go

@@ -23,7 +23,7 @@ import (
 //
 // Use various methods to change properties of Pushed points:
 //
-//   imd.Color(pixel.RGBA{R: 1, G: 0, B: 0, A: 1})
+//   imd.Color(pixel.RGB(1, 0, 0))
 //   imd.Push(pixel.V(200, 200))
 //   imd.Circle(400, 0)
 //
@@ -87,7 +87,7 @@ func New(pic pixel.Picture) *IMDraw {
 		batch: pixel.NewBatch(tri, pic),
 	}
 	im.SetMatrix(pixel.IM)
-	im.SetColorMask(pixel.RGBA{R: 1, G: 1, B: 1, A: 1})
+	im.SetColorMask(pixel.Alpha(1))
 	im.Reset()
 	return im
 }

interface.go

@@ -153,7 +153,7 @@ type TargetPicture interface {
 // PictureColor specifies Picture with Color property, so that every position inside the Picture's
 // Bounds has a color.
 //
-// Positions outside the Picture's Bounds must return full transparent (RGBA{R: 0, G: 0, B: 0, A: 0}).
+// Positions outside the Picture's Bounds must return full transparent (Alpha(0)).
 type PictureColor interface {
 	Picture
 	Color(at Vec) RGBA

pixelgl/canvas.go

@@ -96,7 +96,7 @@ func (c *Canvas) SetMatrix(m pixel.Matrix) {
 
 // SetColorMask sets a color that every color in triangles or a picture will be multiplied by.
 func (c *Canvas) SetColorMask(col color.Color) {
-	rgba := pixel.RGBA{R: 1, G: 1, B: 1, A: 1}
+	rgba := pixel.Alpha(1)
 	if col != nil {
 		rgba = pixel.ToRGBA(col)
 	}

pixelgl/glframe.go

@@ -67,7 +67,7 @@ func (gf *GLFrame) Color(at pixel.Vec) pixel.RGBA {
 		gf.dirty = false
 	}
 	if !gf.bounds.Contains(at) {
-		return pixel.RGBA{}
+		return pixel.Alpha(0)
 	}
 	bx, by, bw, _ := intBounds(gf.bounds)
 	x, y := int(at.X())-bx, int(at.Y())-by

pixelgl/glpicture.go

@@ -84,7 +84,7 @@ func (gp *glPicture) Texture() *glhf.Texture {
 
 func (gp *glPicture) Color(at pixel.Vec) pixel.RGBA {
 	if !gp.bounds.Contains(at) {
-		return pixel.RGBA{}
+		return pixel.Alpha(0)
 	}
 	bx, by, bw, _ := intBounds(gp.bounds)
 	x, y := int(at.X())-bx, int(at.Y())-by

sprite.go

@@ -28,7 +28,7 @@ func NewSprite(pic Picture, frame Rect) *Sprite {
 		d:   Drawer{Triangles: tri},
 	}
 	s.matrix = IM
-	s.mask = RGBA{1, 1, 1, 1}
+	s.mask = Alpha(1)
 	s.Set(pic, frame)
 	return s
 }