merging all related stuff here

http/blank/blank.go

@@ -0,0 +1,48 @@
+package blank
+
+import (
+	"image"
+	"image/color"
+	"image/draw"
+
+	"git.nkpl.cc/twocookedfaggots/imageutils"
+)
+
+type blank struct {
+	image.Image
+	color.Color
+	imageutils.Side
+}
+
+func (b blank) ColorModel() color.Model { return b.Image.ColorModel() }
+
+func (b blank) Bounds() image.Rectangle {
+	rect := image.Rectangle{}
+	switch b.Side {
+	case imageutils.Left:
+		fallthrough
+	case imageutils.Right:
+		rect = image.Rectangle{
+			image.ZP,
+			image.Point{
+				1, b.Image.Bounds().Dy(),
+			},
+		}
+	case imageutils.Up:
+		fallthrough
+	case imageutils.Down:
+		rect = image.Rectangle{
+			image.ZP,
+			image.Point{
+				b.Image.Bounds().Dx(), 1,
+			},
+		}
+	}
+	return rect
+}
+
+func (b blank) At(x, y int) color.Color { return b.Color }
+
+func Blank(img image.Image, clr color.Color, side imageutils.Side) image.Image {
+	return imageutils.Concat(img, blank{img, clr, side}, side)
+}

http/http.go

@@ -10,12 +10,15 @@ type imageTransform struct {
 	TransformFunc func(image.Image) image.Image
 }
 
+type BlankFill struct {
+}
+
 func (t imageTransform) ServeHTTP(w http.ResponseWriter, r *http.Request) {
-	
+
 }
 
 func indexHTML(w http.ResponseWriter, r *http.Request) {
-	f, err := os.Open("index.html")
+	f, err := os.Open("")
 	if err != nil {
 		w.WriteHeader(http.StatusInternalServerError)
 		log.Fatalln("error opening file:", err)

http/test.go

@@ -0,0 +1,33 @@
+//go:build ignore	
+package main
+
+import "git.nkpl.cc/twocookedfaggots/imageutils/http/blank"
+
+func BlankFillWhiteUp(img image.Image) image.Image {
+	for i := 0; i < img.Bounds().Dx(); i++ {
+		img = blank.Blank(img, color.White, Up)
+	}
+	return img
+}
+
+func ProcessImageStdio(f func(image.Image) image.Image) error {
+	img, err := png.Decode(os.Stdin)
+	if err != nil {
+		return err
+	}
+	img = f(img)	
+	err := img.Encode(os.Stdout, img)
+	if err != nil {
+		return err
+	}
+	return nil	
+}
+
+func main() {
+	err := ProcessImageStdio(
+		BlankFillWhiteUp,
+	)
+	if err != nil {
+		panic(err)
+	}
+}