repl: add scale, rotate

render/image.go

@@ -6,6 +6,7 @@ import (
 	_ "image/gif" // register gif, jpeg, png format handlers
 	_ "image/jpeg"
 	"image/png"
+	"math"
 	"os"
 
 	"golang.org/x/image/draw"
@@ -63,10 +64,28 @@ func ImgColorFilter(img *image.NRGBA, from, to color.NRGBA) *image.NRGBA {
 	return r
 }
 
-func ScaleImage(img image.Image, factor int) (scaled *image.NRGBA) {
+func ScaleImage(img image.Image, factorX, factorY float64, highQuality bool) (scaled *image.NRGBA) {
 	b := img.Bounds()
-	scaledBounds := image.Rect(0, 0, b.Max.X*factor, b.Max.Y*factor)
+	newX := int(math.Ceil(factorX * float64(b.Max.X)))
+	newY := int(math.Ceil(factorY * float64(b.Max.Y)))
+	scaledBounds := image.Rect(0, 0, newX, newY)
 	scaledImg := image.NewNRGBA(scaledBounds)
-	draw.NearestNeighbor.Scale(scaledImg, scaledBounds, img, b, draw.Src, nil)
+	scaler := draw.NearestNeighbor
+	if highQuality {
+		scaler = draw.CatmullRom
+	}
+	scaler.Scale(scaledImg, scaledBounds, img, b, draw.Src, nil)
 	return scaledImg
 }
+
+func RotateImage90(img *image.NRGBA) (rotated *image.NRGBA) {
+	b := img.Bounds()
+	rotated = image.NewNRGBA(image.Rect(0, 0, b.Max.Y, b.Max.X))
+	for x := b.Min.X; x < b.Max.X; x++ {
+		for y := b.Min.Y; y < b.Max.Y; y++ {
+			col := img.NRGBAAt(x, y)
+			rotated.SetNRGBA(b.Max.Y-y, x, col)
+		}
+	}
+	return
+}

render/text.go

@@ -16,7 +16,7 @@ func pt(p fixed.Point26_6) image.Point {
 	}
 }
 
-func RenderText(text string, scale int, texture, bgTex image.Image) *image.NRGBA {
+func RenderText(text string, scale float64, texture, bgTex image.Image) *image.NRGBA {
 	face := basicfont.Face7x13
 	stringBounds, _ := font.BoundString(face, text)
 
@@ -38,5 +38,5 @@ func RenderText(text string, scale int, texture, bgTex image.Image) *image.NRGBA
 	img.Rect = img.Bounds().Sub(img.Bounds().Min)
 
 	// scale up, as this font is quite small
-	return ScaleImage(img, scale)
+	return ScaleImage(img, scale, scale, false)
 }

rpc/repl.go

@@ -28,7 +28,7 @@ const textMode = "txt"
 // RunREPL starts reading os.Stdin for commands to apply to the given Fluter
 func RunREPL(f Fluter) {
 	mode := commandMode
-	textSize := 10
+	textSize := 10.0
 	var textCol image.Image = image.White
 	var bgCol image.Image = image.Transparent
 
@@ -109,7 +109,7 @@ func RunREPL(f Fluter) {
 			case "txt":
 				if len(args) > 0 {
 					if size, err := strconv.Atoi(args[0]); err == nil {
-						textSize = size
+						textSize = float64(size)
 					}
 				}
 				if len(args) > 1 {
@@ -138,6 +138,33 @@ func RunREPL(f Fluter) {
 					}
 				}
 
+			case "scale", "s":
+				quality := true
+				var facX, facY float64
+				var err error
+				if len(args) >= 1 {
+					facX, err = strconv.ParseFloat(args[0], 64)
+					if err != nil {
+						fmt.Println(err)
+						continue
+					}
+					facY = facX
+					if len(args) >= 2 {
+						facY, err = strconv.ParseFloat(args[1], 64)
+						if err != nil {
+							fmt.Println(err)
+							continue
+						}
+					}
+					if len(args) > 2 {
+						quality = false
+					}
+					t.Img = render.ScaleImage(t.Img, facX, facY, quality)
+				}
+
+			case "rotate", "r":
+				t.Img = render.RotateImage90(t.Img)
+
 			// the commands below don't affect the task, so we don't need to apply it to clients -> continue
 
 			case "metrics":
@@ -176,6 +203,8 @@ func printHelp() {
 		i <filepath>                         set image
 		txt <scale> <color <bgcolor> <txt>   send text
 		txt [<scale> [<color> [<bgcolor>]]   enter interactive text mode
+		scale <facX> [<facY> [lofi]]         scale content
+		rotate                               rotate content 90°
 	draw modes
 		o                                    set order (l,r,t,b,random)
 		of <x> <y>                           set top-left offset