Update .gitignore

.gitignore

@@ -2,3 +2,6 @@ child_porn
 imageutils.test
 cpu.out
 profile.out
+*.png
+*.jpg
+*.jpeg

README

@@ -1,3 +0,0 @@
-(with a dummy as fuck image rescaling)
-utilities work in theory, but doing everything very slow.
-i really love Go's image.Image interface type, but its really hard to do something with it well.

README.md

@@ -0,0 +1,9 @@
+# imageutils
+## that is exactly image utilities, what i made for myself
+
+||(with a dummy as fuck image rescaling)||
+utilities work in theory, but doing everything very slow.
+i really love Go's image.Image interface type, but its really hard to do something with it well.
+
+TODO: 
+	- create main binary that give access to all implemented things in cmd/

circle.go

@@ -0,0 +1,24 @@
+package imageutils
+
+import (
+	"image"
+	"image/color"
+)
+
+// go.dev/blog/image-draw#drawing-through-a-mask
+type Circle struct {
+	image.Point
+	R int
+}
+
+func (c Circle) ColorModel() color.Model { return color.Alpha16Model }
+func (c Circle) Bounds() image.Rectangle {
+	return image.Rect(c.Point.X-c.R, c.Point.Y-c.R, c.Point.X+c.R, c.Point.Y+c.R)
+}
+func (c Circle) At(x, y int) color.Color {
+	xx, yy, rr := float64(x-c.Point.X)+0.5, float64(y-c.Point.Y)+0.5, float64(c.R)
+	if xx*xx+yy*yy < rr*rr {
+		return color.Opaque
+	}
+	return color.Transparent
+}

cmd/dither/main.go

@@ -0,0 +1,22 @@
+package main
+
+import (
+	"flag"
+	"image"
+
+	"git.nkpl.cc/twocookedfaggots/imageutils/pkg/dithering"
+	"git.nkpl.cc/twocookedfaggots/imageutils/util"
+)
+
+var factor = flag.Float64("n", 0.75, "dithering effect 'magic' number")
+
+func main() {
+	flag.Parse()
+
+	println(*factor)
+	if err := util.ProcessStdio(func(img image.Image) image.Image {
+		return dithering.Dithering{img, *factor}
+	}); err != nil {
+		panic(err)
+	}
+}

cmd/jpg2png/jpg2png.go

@@ -0,0 +1,18 @@
+package main
+
+import (
+	"image/jpeg"
+	"image/png"
+	"os"
+)
+
+func main() {
+	img, err := jpeg.Decode(os.Stdin)
+	if err != nil {
+		panic(err)
+	}
+	err = png.Encode(os.Stdout, img)
+	if err != nil {
+		panic(err)
+	}
+}

cmd/negate/negate.go

@@ -0,0 +1,39 @@
+package main
+
+import (
+	"image"
+	"image/color"
+
+	"git.nkpl.cc/twocookedfaggots/imageutils/util"
+)
+
+func NegateRGBA(c color.RGBA) color.RGBA {
+	c.R = 255 - c.R
+	c.G = 255 - c.G
+	c.B = 255 - c.B
+	return c
+}
+
+type Negate struct{ image.Image }
+
+func (n Negate) ColorModel() color.Model { return n.Image.ColorModel() }
+func (n Negate) Bounds() image.Rectangle { return n.Image.Bounds() }
+func (n Negate) At(x, y int) color.Color {
+	c := n.Image.At(x, y)
+	r, g, b, a := c.RGBA()
+	RGBAColor := color.RGBA{
+		R: uint8(r >> 8),
+		G: uint8(g >> 8),
+		B: uint8(b >> 8),
+		A: uint8(a >> 8),
+	}
+	return NegateRGBA(RGBAColor)
+}
+
+func main() {
+	if err := util.ProcessStdio(func(img image.Image) image.Image {
+		return Negate{img}
+	}); err != nil {
+		panic(err)
+	}
+}

cmd/playground/circles/circles.go

@@ -0,0 +1,65 @@
+package main
+
+import (
+	"image"
+	"image/color"
+	"image/draw"
+	"image/png"
+	"math/rand"
+	"os"
+
+	iu "git.nkpl.cc/twocookedfaggots/imageutils"
+)
+
+func square(side int) image.Rectangle { return image.Rect(0, 0, side, side) }
+
+func Circles(b image.Rectangle, radius int) chan iu.Circle {
+	ch := make(chan iu.Circle)
+	go func() {
+		defer close(ch)
+		for {
+			x, y := rand.Int()%b.Dx(), rand.Int()%b.Dy()
+			dxdy := b.Dx() * b.Dy()
+			r := rand.Int() % (dxdy / (dxdy / radius))
+			ch <- iu.Circle{image.Point{x, y}, r}
+		}
+	}()
+	return ch
+}
+
+var exchange = color.ModelFunc(
+	func(c color.Color) color.Color {
+		if color.Alpha16Model.Convert(c) == color.Transparent {
+			return color.Opaque
+		}
+		return color.Transparent
+	},
+)
+
+type Exchange struct{ image.Image }
+
+func (e Exchange) ColorModel() color.Model { return color.Alpha16Model }
+func (e Exchange) Bounds() image.Rectangle { return e.Image.Bounds() }
+func (e Exchange) At(x, y int) color.Color {
+	c := e.ColorModel().Convert(e.Image.At(x, y))
+	return exchange.Convert(c)
+}
+
+var blackAndWhite = color.ModelFunc(
+	func(c color.Color) color.Color {
+		if color.Alpha16Model.Convert(c) == color.Transparent {
+			return color.Black
+		}
+		return color.White
+	},
+)
+
+// Black and white's alpha image.
+type BlackAndWhite struct{ image.Image }
+
+func (b BlackAndWhite) ColorModel() color.Model { return color.GrayModel }
+func (b BlackAndWhite) Bounds() image.Rectangle { return b.Image.Bounds() }
+func (b BlackAndWhite) At(x, y int) color.Color {
+	c := b.Image.At(x, y)
+	return blackAndWhite.Convert(c)
+}

cmd/playground/circles/colored.go

@@ -0,0 +1,24 @@
+//go:build colored
+
+package main
+
+/*
+const (
+	red = iota
+	green
+	blue
+)
+*/
+
+func main() {
+	canvas := image.NewRGBA(image.Rect(0, 0, 3840, 2160))
+	circles := Circles(canvas.Bounds(), 2160/6)
+
+	palette := []color.Color{
+		color.RGBA{R: 255, A: 255},
+		color.RGBA{G: 255, A: 255},
+		color.RGBA{B: 255, A: 255},
+	}
+	c := palette[rand.Int()%2]
+
+}

cmd/playground/circles/main.go

@@ -0,0 +1,28 @@
+package main
+
+func main() {
+	canvas := image.NewRGBA(image.Rect(0, 0, 3840, 2160))
+	circles := Circles(canvas.Bounds(), 2160/6)
+
+	// draw n circles
+	for i := 0; i < 24; i++ {
+		c := <-circles
+
+		draw.Draw(canvas, c.Bounds(), xor{c, canvas}, c.Bounds().Min, draw.Src)
+		/*
+			draw.DrawMask(
+				canvas, canvas.Bounds(), &image.Uniform{color.White},
+				image.Point{}, xor{c, canvas}, image.Point{}, draw.Src,
+			)
+		*/
+	}
+	/*
+		newCanvas := image.NewRGBA(canvas.Bounds())
+		draw.Draw(newCanvas, newCanvas.Bounds(), &image.Uniform{color.RGBA{255, 255, 0, 255}}, image.ZP, draw.Over)
+		draw.Draw(newCanvas, newCanvas.Bounds(), canvas, image.ZP, draw.Over)
+	*/
+	err := png.Encode(os.Stdout, BlackAndWhite{canvas})
+	if err != nil {
+		panic(err)
+	}
+}

cmd/playground/circles/xor.go

@@ -0,0 +1,19 @@
+package main
+
+var Opaque, Transparent = color.Alpha{0xff}, color.Alpha{0}
+
+type xor struct{ dst, src image.Image }
+
+func (t xor) ColorModel() color.Model { return t.dst.ColorModel() }
+func (t xor) Bounds() image.Rectangle { return t.src.Bounds() }
+func (t xor) At(x, y int) color.Color {
+	dstColor := t.ColorModel().Convert(t.dst.At(x, y))
+	srcColor := t.ColorModel().Convert(t.src.At(x, y))
+
+	// xor operation (a || b) && !(a && b)
+	if ((dstColor == color.Opaque) || (srcColor == color.Opaque)) &&
+		!((dstColor == color.Opaque) && (srcColor == color.Opaque)) {
+		return color.Opaque
+	}
+	return color.Transparent
+}

cmd/playground/circles/xor_colored.go

@@ -0,0 +1 @@
+package main

cmd/playground/main.go

@@ -0,0 +1,9 @@
+package main
+
+import (
+	iu "git.nkpl.cc/twocookedfaggots/imageutils"
+)
+
+func main() {
+
+}

cmd/playground/mask/circles.go

@@ -0,0 +1,80 @@
+package main
+
+import (
+	"image"
+	"image/color"
+	"math/rand"
+
+	iu "git.nkpl.cc/twocookedfaggots/imageutils"
+)
+
+func square(side int) image.Rectangle { return image.Rect(0, 0, side, side) }
+
+func Circles(b image.Rectangle, radius int) chan iu.Circle {
+	ch := make(chan iu.Circle)
+	go func() {
+		defer close(ch)
+		for {
+			x, y := rand.Int()%b.Dx(), rand.Int()%b.Dy()
+			dxdy := b.Dx() * b.Dy()
+			r := rand.Int() % (dxdy / (dxdy / radius))
+			ch <- iu.Circle{image.Point{x, y}, r}
+		}
+	}()
+	return ch
+}
+
+var Opaque, Transparent = color.Alpha{0xff}, color.Alpha{0}
+
+type xor struct{ dst, src image.Image }
+
+func (t xor) ColorModel() color.Model { return t.dst.ColorModel() }
+func (t xor) Bounds() image.Rectangle { return t.src.Bounds() }
+func (t xor) At(x, y int) color.Color {
+	dstColor := t.ColorModel().Convert(t.dst.At(x, y))
+	srcColor := t.ColorModel().Convert(t.src.At(x, y))
+
+	// xor operation (a || b) && !(a && b)
+	if ((dstColor == color.Opaque) || (srcColor == color.Opaque)) &&
+		!((dstColor == color.Opaque) && (srcColor == color.Opaque)) {
+		return color.Opaque
+	}
+	return color.Transparent
+}
+
+var exchange = color.ModelFunc(
+	func(c color.Color) color.Color {
+		if color.Alpha16Model.Convert(c) == color.Transparent {
+			return color.Opaque
+		}
+		return color.Transparent
+	},
+)
+
+type Exchange struct{ image.Image }
+
+func (e Exchange) ColorModel() color.Model { return color.Alpha16Model }
+func (e Exchange) Bounds() image.Rectangle { return e.Image.Bounds() }
+func (e Exchange) At(x, y int) color.Color {
+	c := e.ColorModel().Convert(e.Image.At(x, y))
+	return exchange.Convert(c)
+}
+
+var blackAndWhite = color.ModelFunc(
+	func(c color.Color) color.Color {
+		if color.Alpha16Model.Convert(c) == color.Transparent {
+			return color.Black
+		}
+		return color.White
+	},
+)
+
+// Black and white's alpha image.
+type BlackAndWhite struct{ image.Image }
+
+func (b BlackAndWhite) ColorModel() color.Model { return color.Gray16Model }
+func (b BlackAndWhite) Bounds() image.Rectangle { return b.Image.Bounds() }
+func (b BlackAndWhite) At(x, y int) color.Color {
+	c := b.Image.At(x, y)
+	return blackAndWhite.Convert(c)
+}

cmd/playground/mask/mask.go

@@ -0,0 +1,62 @@
+package main
+
+import (
+	"image"
+	"image/color"
+	"image/draw"
+	"image/png"
+	"os"
+)
+
+type XORMask struct {
+	dst, src image.Image
+}
+
+func (m XORMask) ColorModel() color.Model { return color.Gray16Model }
+func (m XORMask) Bounds() image.Rectangle { return m.dst.Bounds() }
+func (m XORMask) At(x, y int) color.Color {
+	srcColor := m.src.At(x, y)
+	dstColor := m.dst.At(x, y)
+
+	if ((dstColor == color.Black) || (srcColor == color.Black)) &&
+		!((dstColor == color.Black) && (srcColor == color.Black)) {
+		return color.Black
+	}
+	return color.White
+}
+
+func main() {
+	img, err := png.Decode(os.Stdin)
+	if err != nil {
+		panic(err)
+	}
+
+	grayImg := image.NewGray16(img.Bounds())
+	for y := img.Bounds().Min.Y; y < img.Bounds().Max.Y; y++ {
+		for x := img.Bounds().Min.X; x < img.Bounds().Max.X; x++ {
+			c := img.At(x, y)
+			grayImg.Set(x, y, color.Gray16Model.Convert(c))
+		}
+	}
+	canvas := image.NewRGBA(img.Bounds())
+	circle := Circles(canvas.Bounds(), canvas.Bounds().Dy()/6)
+	for i := 0; i < 24; i++ {
+		c := <-circle
+		draw.Draw(canvas, c.Bounds(), xor{c, canvas}, c.Bounds().Min, draw.Src)
+	}
+
+	err = png.Encode(
+		os.Stdout, XORMask{
+			grayImg,
+			BlackAndWhite{
+				Exchange{
+					canvas,
+				},
+			},
+		},
+	)
+	if err != nil {
+		panic(err)
+	}
+
+}

cmd/scale/downscale.go

@@ -0,0 +1,22 @@
+//go:build upsampling
+
+package main
+
+import (
+	"flag"
+	"image"
+
+	"git.nkpl.cc/twocookedfaggots/imageutils"
+	"git.nkpl.cc/twocookedfaggots/imageutils/util"
+)
+
+var scale = flag.Int("n", 2, "rescale by factor")
+
+func main() {
+	flag.Parse()
+	if err := util.ProcessStdio(func(img image.Image) image.Image {
+		return imageutils.Scale(img, *scale)
+	}); err != nil {
+		panic(err)
+	}
+}

cmd/scale/griddownscale.go

@@ -0,0 +1,24 @@
+package main
+
+import (
+	"flag"
+	"image"
+
+	"git.nkpl.cc/twocookedfaggots/imageutils/pkg/downscale"
+	"git.nkpl.cc/twocookedfaggots/imageutils/util"
+)
+
+var x = flag.Int("x", 1024, "dx value of new bounds")
+var y = flag.Int("y", 1024, "dy value of new bounds")
+
+func main() {
+	flag.Parse()
+	if err := util.ProcessStdio(func(img image.Image) image.Image {
+		return downscale.GridDownscale{
+			Image:     img,
+			NewBounds: image.Rect(0, 0, *x, *y),
+		}
+	}); err != nil {
+		panic(err)
+	}
+}

cmd/textonimage/main.go

@@ -0,0 +1,36 @@
+package main
+
+var (
+	x    = flag.Int("x", 0, "")
+	y    = flag.Int("y", 0, "")
+	size = flag.Int("size", 24, "size of font")
+	// img = flag.String("path", "", "path to image")
+)
+
+func main() {
+	flag.Parse()
+
+	f, err := truetype.Parse(gomono.TTF)
+	if err != nil {
+		panic(err)
+	}
+	face := truetype.NewFace(f, &truetype.Options{
+		Size:    float64(img.Bounds().Dx() / size),
+		DPI:     72,
+		Hinting: font.HintingNone,
+	})
+
+	d := &font.Drawer{
+		Dst:  dst,
+		Src:  image.NewUniform(color.Black),
+		Face: face,
+		Dot: fixed.Point26_6{fixed.Int26_6(img.Bounds().Dx() /
+			x,
+		),
+			fixed.Int26_6(img.Bounds().Dy() /
+				y,
+			),
+		},
+	}
+	d.DrawString(time.Now().Format(time.Kitchen))
+}

color/test.go

@@ -0,0 +1,12 @@
+package main
+
+import "image/color"
+
+func main() {
+	c1, c2 := color.Black,
+		color.Gray16Model.Convert(color.RGBA{})
+
+	println(c1.RGBA())
+	println(c2.RGBA())
+	println(c1 == c2)
+}

go.mod

@@ -1,5 +1,13 @@
-module git.niplace.ru/XoxJlopeZi4BB/imageutils
+module git.nkpl.cc/twocookedfaggots/imageutils
 
-go 1.22.6
+go 1.25.5
 
-require github.com/potassium5703/texture v0.0.0-20240820054037-fce43fc4b0f0 // indirect
+require (
+	github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0
+	golang.org/x/image v0.43.0
+)
+
+require (
+	github.com/dbriemann/pixel v0.5.1 // indirect
+	github.com/go-gl/mathgl v1.2.0 // indirect
+)

go.sum

@@ -1,2 +1,10 @@
-github.com/potassium5703/texture v0.0.0-20240820054037-fce43fc4b0f0 h1:sowjIIVme5ovcdB0kjP3w+4xbVNrlOPdx7Up4LIGJz8=
-github.com/potassium5703/texture v0.0.0-20240820054037-fce43fc4b0f0/go.mod h1:KwM7hMpZhr3XySWuK/SZ7s1BXVQe8p1IyZftYg9KtWY=
+github.com/dbriemann/pixel v0.5.1 h1:9iPqkfolOW2VRu8IzEbUBii9/S5ubMwPTQP7xBGkNX8=
+github.com/dbriemann/pixel v0.5.1/go.mod h1:iWjzS4T3euA4FW04ULyz3SCkZB5LyK7pwTR1vyZFv0E=
+github.com/go-gl/mathgl v1.2.0 h1:v2eOj/y1B2afDxF6URV1qCYmo1KW08lAMtTbOn3KXCY=
+github.com/go-gl/mathgl v1.2.0/go.mod h1:pf9+b5J3LFP7iZ4XXaVzZrCle0Q/vNpB/vDe5+3ulRE=
+github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 h1:DACJavvAHhabrF08vX0COfcOBJRhZ8lUbR+ZWIs0Y5g=
+github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0/go.mod h1:E/TSTwGwJL78qG/PmXZO1EjYhfJinVAhrmmHX6Z8B9k=
+golang.org/x/image v0.36.0 h1:Iknbfm1afbgtwPTmHnS2gTM/6PPZfH+z2EFuOkSbqwc=
+golang.org/x/image v0.36.0/go.mod h1:YsWD2TyyGKiIX1kZlu9QfKIsQ4nAAK9bdgdrIsE7xy4=
+golang.org/x/image v0.43.0 h1:FLxcP4ec2350nTfOC8ysKtqYSIFbk/QGjw1ZHNP4tsY=
+golang.org/x/image v0.43.0/go.mod h1:rrpelvGFt+kLPAjPM4HeWPgrl0FtafueU//e5N0qk/Q=

http/blank/blank.go

@@ -0,0 +1,47 @@
+package blank
+
+import (
+	"image"
+	"image/color"
+
+	"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

@@ -0,0 +1,43 @@
+package main
+
+import (
+	"log"
+	"net/http"
+)
+
+type imageTransform struct {
+	image.Image
+	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("")
+	if err != nil {
+		w.WriteHeader(http.StatusInternalServerError)
+		log.Fatalln("error opening file:", err)
+		return
+	}
+	_, err := io.Copy(w, f)
+	if err != nil {
+		w.WriteHeader(http.StatusInternalServerError)
+		log.Println("copy error:", err)
+		return
+	}
+}
+
+func main() {
+	http.HandleFunc("/", indexHTML)
+	http.Handle("POST /upload", imageTransform)
+
+	err := http.ListenAndServe(":8080", nil)
+	if err != nil {
+		log.Panicln(err)
+	}
+}

http/index.html

@@ -0,0 +1,4 @@
+<form action="/upload" method="POST" enctype="multipart/form-data">
+    <input type="file" name="image" accept="image/*" required>
+    <button type="submit">Upload Image</button>
+</form>

http/test.go

@@ -0,0 +1,49 @@
+//go:build ignore
+
+// works as i wanted
+
+package main
+
+import (
+	"git.nkpl.cc/twocookedfaggots/imageutils"
+	"git.nkpl.cc/twocookedfaggots/imageutils/http/blank"
+	"image"
+	"image/color"
+	"image/jpeg"
+	"image/png"
+	"os"
+)
+
+func BlankFillWhite(img image.Image) image.Image {
+	dy := img.Bounds().Dy()
+	up, down := dy*2/3, dy*1/3
+	for i := 0; i < up; i++ {
+		img = blank.Blank(img, color.White, imageutils.Up)
+	}
+	for i := 0; i < down; i++ {
+		img = blank.Blank(img, color.White, imageutils.Down)
+	}
+	return img
+}
+
+func ProcessImageStdio(f func(image.Image) image.Image) error {
+	img, err := jpeg.Decode(os.Stdin)
+	if err != nil {
+		return err
+	}
+	img = f(img)
+	err = png.Encode(os.Stdout, img)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func main() {
+	err := ProcessImageStdio(
+		BlankFillWhite,
+	)
+	if err != nil {
+		panic(err)
+	}
+}

pkg/center/main.go

@@ -0,0 +1,18 @@
+package center
+
+type Into struct {
+	Src, Dst image.Image
+}
+
+func (i Into) Bounds() image.Rectangle { return i.Dst.Bounds() }
+func (i Into) ColorModel() color.Model { return i.Dst.ColorModel }
+func (i Into) At(x, y int) color.Color {
+	x1, y1 := (i.Dst.Bounds().Dx()/2)-(i.Src.Bounds().Dx()/2),
+		(i.Dst.Bounds().Dy()/2)-(i.Src.Bounds().Dy()/2)
+	r := image.Rect(x1, y1,
+		x1+i.Src.Bounds().Dx(), y1+i.Src.Bounds().Dy())
+	if (image.Point{x, y}).In(r) {
+		return i.Src.At(x-x1, y-y2)
+	}
+	return i.Dst.At(x, y)
+}

pkg/clock/README.md

@@ -0,0 +1,8 @@
+залил как есть.
+любая кринжовая хуйня которая здесь найдется... просто зайбейте на это хуй, не обращайте внимания  
+
+запускается значится так:
+заходите в cmd и...
+> go run .
+
+заходите в бровз и пишите адрес с портом 

pkg/clock/clock.go

@@ -0,0 +1,82 @@
+//go:build draft
+package clock
+
+import (
+	"image"
+	"image/color"
+	"image/png"
+	"io"
+	"strconv"
+	"time"
+
+	"git.niplace.ru/XoxJlopeZi4BB/clock/letter"
+	"git.niplace.ru/XoxJlopeZi4BB/imageutils"
+)
+
+
+
+var img1, img2 = letter.Render(letter.Nums[6]), letter.Render(letter.Nums[9])
+
+func DownRightBlank(img image.Image) image.Image {
+	clr := color.White
+	img = letter.Blank(img, clr, imageutils.Down)
+	return letter.Blank(img, clr, imageutils.Right)
+}
+
+func LeftUpBlank(img image.Image) image.Image {
+	clr := color.White
+	img = letter.Blank(img, clr, imageutils.Left)
+	return letter.Blank(img, clr, imageutils.Up)
+}
+
+func RenderNum(n int) image.Image {
+	var img image.Image = image.NewRGBA(image.Rect(0, 0, 0, 0))
+	s := strconv.Itoa(n)
+	for i := range s {
+		n, err := strconv.Atoi(string(s[i]))
+		if err != nil {
+			panic(err)
+		}
+
+		num := letter.Render(letter.Nums[n])
+		num = DownRightBlank(num)
+		img = imageutils.Concat(img, num, imageutils.Right)
+	}
+	img = LeftUpBlank(img)
+	return img
+}
+
+func RenderTime(t time.Time) image.Image {
+	hour := RenderNum(t.Hour())
+	if t.Hour() < 10 {
+		hour = imageutils.Concat(
+			DownRightBlank(letter.Empty), hour, imageutils.Right)
+	}
+	minute := RenderNum(t.Minute())
+	if t.Minute() < 10 {
+		minute = imageutils.Concat(
+			DownRightBlank(letter.Empty), minute, imageutils.Right)
+	}
+
+	img := imageutils.Concat(hour, minute, imageutils.Down)
+	return img
+}
+
+func Margin(img image.Image, length int) image.Image {
+	for i := 0; i < length; i++ {
+		img = LeftUpBlank(DownRightBlank(img))
+	}
+	return img
+}
+
+func Time(w io.Writer) {
+	t := time.Now()
+	img := RenderTime(t)
+	img = Margin(img, 3)
+	img = imageutils.Scale(img, 1<<6)
+
+	err := png.Encode(w, img)
+	if err != nil {
+		panic(err)
+	}
+}

pkg/clock/clock_test.go

@@ -0,0 +1,13 @@
+//go:build ignore
+package clock
+
+import (
+	"io"
+	"testing"
+)
+
+func BenchmarkNumber(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		Numbers(io.Discard)
+	}
+}

pkg/clock/cmd/main.go

@@ -0,0 +1,22 @@
+package main
+
+import (
+	"net/http"
+
+	"git.niplace.ru/XoxJlopeZi4BB/clock"
+)
+
+func main() {
+	addrwithport := ":8080"
+	http.HandleFunc("/",
+		func(w http.ResponseWriter, req *http.Request) {
+			clock.Time(w)
+		},
+	)
+
+	println("this thingy running on", addrwithport)
+	err := http.ListenAndServe(addrwithport, nil)
+	if err != nil {
+		panic(err)
+	}
+}

pkg/clock/digit/digit.go

@@ -0,0 +1,22 @@
+package main
+
+import (
+	"fmt"
+	"time"
+)
+
+func main() {
+	d, err := time.ParseDuration("1s")
+	if err != nil {
+		panic(err)
+	}
+	t := time.Tick(d)
+	go func() {
+		fmt.Printf("\033[2J\033[H")
+		for {
+			<-t
+			fmt.Printf("\r%s", time.Now().Format(time.TimeOnly))
+		}
+	}()
+	select {}
+}

pkg/clock/go.mod

@@ -0,0 +1,5 @@
+module git.niplace.ru/XoxJlopeZi4BB/clock
+
+go 1.25.3
+
+require git.niplace.ru/XoxJlopeZi4BB/imageutils v0.0.0-20241224134015-2709034fc322

pkg/clock/go.sum

@@ -0,0 +1,4 @@
+git.niplace.ru/XoxJlopeZi4BB/imageutils v0.0.0-20241224134015-2709034fc322 h1:jefEdqKZ/JKnmky9LipaS/UH0phAhz/56ORHIjmHREk=
+git.niplace.ru/XoxJlopeZi4BB/imageutils v0.0.0-20241224134015-2709034fc322/go.mod h1:QieEgSGk9ZYISDv5XyMMktQXi/2qlTmdHuxTlt1Xfq8=
+github.com/potassium5703/texture v0.0.0-20240820054037-fce43fc4b0f0 h1:sowjIIVme5ovcdB0kjP3w+4xbVNrlOPdx7Up4LIGJz8=
+github.com/potassium5703/texture v0.0.0-20240820054037-fce43fc4b0f0/go.mod h1:KwM7hMpZhr3XySWuK/SZ7s1BXVQe8p1IyZftYg9KtWY=

pkg/clock/letter/image.go

@@ -0,0 +1,106 @@
+package letter
+
+import (
+	"embed"
+	"encoding/csv"
+	"image"
+	"image/color"
+	"image/draw"
+	"io"
+
+	"git.niplace.ru/XoxJlopeZi4BB/imageutils"
+)
+
+type Letter string
+
+//go:embed map.csv
+var fs embed.FS
+var mapFile = func() io.Reader {
+	f, err := fs.Open("map.csv")
+	if err != nil {
+		panic(err)
+	}
+	return f
+}()
+
+var Letters = func(r io.Reader) (m map[string]string) {
+	records, err := csv.NewReader(r).ReadAll()
+	if err != nil {
+		panic(err)
+	}
+	for _, v := range records {
+		if len(v) < 2 {
+			panic("csv file isn's key-value pair")
+		}
+		m[v[0]] = v[1]
+	}
+	return m
+}(mapFile)
+
+// implements image.Image interface.
+func (l Letter) ColorModel() color.Model {
+	return color.Alpha16Model
+}
+
+// implements image.Image interface.
+func (l Letter) Bounds() image.Rectangle {
+	return image.Rect(0, 0, 3, 3)
+}
+
+// implements image.Image interface.
+func (l Letter) At(x, y int) color.Color {
+	if len(l) != 9 {
+		panic("len(Letter) != 9")
+	}
+	target := l[x+y*3]
+	if target != '1' {
+		return color.Opaque
+	}
+	return color.Transparent
+}
+
+func Render(l Letter) image.Image {
+	img := image.NewRGBA(l.Bounds())
+	draw.Draw(img, l.Bounds(), image.White, image.ZP, draw.Src)
+	draw.Draw(img, l.Bounds(), l, image.ZP, draw.Over)
+	return img
+}
+
+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)
+}

pkg/clock/letter/map.csv

@@ -0,0 +1,11 @@
+0, 	111101111
+1,	010010010
+2,	110010011
+3, 	111011111
+4,	101111001
+5,	011010110
+6,	001111111
+7, 	111001001
+8, 	011111111
+9,	111111001
+:,	010000010

pkg/clock/string.go

@@ -0,0 +1,35 @@
+package clock
+
+import (
+	"git.nkpl.cc/twocookedfaggots/imageutils/clock/letter"
+)
+
+var blank = Letter("000000000")
+
+type String struct {
+	S string
+}
+
+func (s String) Bounds() image.Rectangle {
+	splitted := strings.Split(s.S, '\n')
+	max := 0
+	for _, v := range splitted {
+		max = max(len(v), max)
+	}
+	x, y := max*4+1, len(splitted)*4+1
+	return image.Rect(0,0,x,y)
+}
+
+func (s String) ColorModel() color.Model { return color.Alpha16Model }
+func (s String) At(x, y int) color.Color {
+	splitted := string.Split(s.S, '\n')
+	if y/4 > len(splitted) {
+		return blank.At(0, 0)
+	}
+	if x/4 > len(splitted[y/4]) {
+		return blank.At(0, 0)
+	}
+	c := splitted[y/4][x/4] 
+	return Letter(c).At(x%4, y%4)
+}
+

pkg/dithering/cmd/jpg2png.go

@@ -0,0 +1,20 @@
+//go:build ignore
+
+package main
+
+import (
+	"image/jpeg"
+	"image/png"
+	"os"
+)
+
+func main() {
+	img, err := jpeg.Decode(os.Stdin)
+	if err != nil {
+		panic(err)
+	}
+	err = png.Encode(os.Stdout, img)
+	if err != nil {
+		panic(err)
+	}
+}

pkg/dithering/cmd/main.go

@@ -0,0 +1,17 @@
+package main
+
+import (
+	"image"
+
+	"git.nkpl.cc/twocookedfaggots/imageutils/pkg/dithering"
+	"git.nkpl.cc/twocookedfaggots/imageutils/util"
+)
+
+func main() {
+	err := util.ProcessStdio(func(img image.Image) image.Image {
+		return dithering.Dithering{img}
+	})
+	if err != nil {
+		panic(err)
+	}
+}

pkg/dithering/grid.go

@@ -0,0 +1,66 @@
+package dithering
+
+import (
+	"image"
+	"image/color"
+)
+
+const side = 16
+
+// tile
+type grid struct {
+	color.Gray
+	Factor float64
+}
+
+func (_ grid) ColorModel() color.Model {
+	return color.RGBAModel
+}
+
+func (_ grid) Bounds() image.Rectangle {
+	return image.Rect(0, 0, side, side)
+}
+
+func (g grid) At(x, y int) color.Color {
+	n := uint8(float64(g.Gray.Y) * g.Factor)
+
+	if n == 0 {
+		return color.Black
+	}
+	step := int((side*side - 1) / n)
+	if (y*side+x)%step == 0 {
+		return color.White
+	}
+	return color.Black
+}
+
+type uniformGrid struct {
+	image.Image
+}
+
+func (g uniformGrid) ColorModel() color.Model {
+	return g.Image.ColorModel()
+}
+
+func (g uniformGrid) Bounds() image.Rectangle {
+	// just need to return something
+	return g.Image.Bounds()
+}
+
+func (g uniformGrid) At(x, y int) color.Color {
+	dx, dy := g.Image.Bounds().Dx(), g.Image.Bounds().Dy()
+	return g.Image.At(x%dx, y%dy)
+}
+
+type Dithering struct {
+	image.Image
+	Factor float64
+}
+
+func (d Dithering) ColorModel() color.Model { return color.GrayModel }
+func (d Dithering) Bounds() image.Rectangle { return d.Image.Bounds() }
+func (d Dithering) At(x, y int) color.Color {
+	c := color.GrayModel.Convert(d.Image.At(x, y))
+	return uniformGrid{grid{c.(color.Gray), d.Factor}}.
+		At(x, y)
+}

pkg/dithering/grid_test.go

@@ -0,0 +1,73 @@
+package dithering
+
+import (
+	"image"
+	"image/color"
+	"image/png"
+	"math/rand"
+	"os"
+	"os/exec"
+	"testing"
+	"time"
+
+	"git.nkpl.cc/twocookedfaggots/imageutils"
+)
+
+func init() {
+	rand.Seed(time.Now().UnixNano())
+}
+
+func callImage(img image.Image) {
+	for y := 0; y < img.Bounds().Dy(); y++ {
+		for x := 0; x < img.Bounds().Dx(); x++ {
+			_ = img.At(x, y)
+		}
+	}
+}
+
+func TestGrid(t *testing.T) {
+	command := exec.Command("imv", "-")
+	w, err := command.StdinPipe()
+	if err != nil {
+		t.Fatal(err)
+	}
+	err = command.Start()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	n := uint8(rand.Int() % 256)
+	t.Log(n)
+	img := imageutils.Scale(1<<6, grid{color.Gray{n}})
+	err = png.Encode(w, img)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	callImage(grid{color.Gray{4}})
+	callImage(grid{color.Gray{0}})
+}
+
+func TestDithering(t *testing.T) {
+	r, err := os.Open("/home/potassium/documents/wallpaper/8.png")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer r.Close()
+
+	w, err := os.Create("sample.png")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer w.Close()
+
+	img, err := png.Decode(r)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = png.Encode(w, Dithering{img})
+	if err != nil {
+		t.Fatal(err)
+	}
+}

pkg/downscale/downscale.go

@@ -0,0 +1,58 @@
+package downscale
+
+import (
+	"errors"
+	"image"
+	"image/color"
+)
+
+var errOutOfBounds error = errors.New("downscale: out of bounds")
+
+type Downscaled struct {
+	image.Image
+	Factor int
+}
+
+func isOutOfBounds(pt image.Point, img image.Image) bool {
+	x, y := img.Bounds().Dx(), img.Bounds().Dy()
+	if pt.X > x || pt.Y > y {
+		return true
+	}
+	return false
+}
+
+func meanColor(palette color.Palette) color.Color {
+	var r, g, b int
+	for _, v := range palette {
+		c := color.RGBAModel.Convert(v).(color.RGBA)
+		r += int(c.R)
+		g += int(c.G)
+		b += int(c.B)
+	}
+	r, g, b = r/len(palette), g/len(palette), b/len(palette)
+	return color.RGBA{uint8(r), uint8(g), uint8(b), 0xff}
+}
+
+func (d Downscaled) ColorModel() color.Model { return d.Image.ColorModel() }
+func (d Downscaled) Bounds() image.Rectangle {
+	return image.Rect(0, 0, d.Image.Bounds().Dx()/d.Factor, d.Image.Bounds().Dy()/d.Factor)
+}
+func (d Downscaled) At(x, y int) color.Color {
+	palette := color.Palette{}
+	pt := image.Point{x * d.Factor, y * d.Factor}
+	if isOutOfBounds(pt, d.Image) {
+		panic(errOutOfBounds)
+	}
+	for i := 0; i < d.Factor; i++ {
+		for j := 0; j < d.Factor; j++ {
+			currentPt := image.Point{pt.X + i, pt.Y + j}
+			if i > 0 || j > 0 {
+				if isOutOfBounds(currentPt, d.Image) {
+					continue
+				}
+			}
+			palette = append(palette, d.Image.At(currentPt.X, currentPt.Y))
+		}
+	}
+	return palette.Convert(meanColor(palette))
+}

pkg/downscale/grid.go

@@ -0,0 +1,75 @@
+package downscale
+
+import (
+	"image"
+	"image/color"
+)
+
+type sub struct {
+	image.Image
+	image.Rectangle
+}
+
+func (sub sub) ColorModel() color.Model { return sub.Image.ColorModel() }
+func (sub sub) Bounds() image.Rectangle { return sub.Rectangle }
+func (sub sub) At(x, y int) color.Color {
+	return sub.Image.At(x, y)
+}
+
+type GridDownscale struct {
+	image.Image
+	NewBounds image.Rectangle
+}
+
+func blend(c1, c2 color.Color) color.RGBA {
+	r1, g1, b1, a1 := c1.RGBA()
+	r2, g2, b2, a2 := c2.RGBA()
+
+	r := r1/2 + r2/2
+	g := g1/2 + g2/2
+	b := b1/2 + b2/2
+	a := a1/2 + a2/2
+
+	return color.RGBA{
+		R: uint8(r >> 8),
+		G: uint8(g >> 8),
+		B: uint8(b >> 8),
+		A: uint8(a >> 8),
+	}
+}
+
+func avgColor(img image.Image) (c color.Color) {
+	b := img.Bounds()
+	c = img.At(b.Min.X, b.Min.Y)
+	for y := b.Min.Y; y < b.Max.Y; y++ {
+		for x := b.Min.X + 1; x < b.Max.X; x++ {
+			c = blend(c, img.At(x, y))
+		}
+	}
+	return
+}
+
+func (grid GridDownscale) ColorModel() color.Model { return grid.Image.ColorModel() }
+func (grid GridDownscale) Bounds() image.Rectangle { return grid.NewBounds }
+func (grid GridDownscale) At(x, y int) color.Color {
+	b := grid.Image.Bounds()
+	dx, dy := b.Dx(), b.Dy()
+	cellBounds := image.Rect(
+		0, 0,
+		dx/grid.NewBounds.Dx(),
+		dy/grid.NewBounds.Dy(),
+	)
+
+	r := grid.Image.Bounds().Intersect(
+		// move cell
+		cellBounds.Add(
+			image.Point{
+				x * cellBounds.Dx(),
+				y * cellBounds.Dy(),
+			},
+		),
+	)
+	println(r.Min.X, r.Min.Y)
+
+	return avgColor(sub{grid.Image, r})
+}

pkg/downscale/grid_test.go

@@ -0,0 +1 @@
+package downscale

pkg/grayscale/main.go

@@ -0,0 +1,41 @@
+package main
+
+import (
+	"image"
+	"image/color"
+	"image/png"
+	"os"
+)
+
+// processImage takes input png image from stdin, processes it with f and outputs it to stdout.
+func processImage(f func(image.Image) image.Image) error {
+	img, err := png.Decode(os.Stdin)
+	if err != nil {
+		return err
+	}
+	err = png.Encode(os.Stdout, f(img))
+	if err != nil {
+		return err
+	}
+	return err
+}
+
+type convert struct {
+	image.Image
+	color.Model
+}
+
+func (c convert) ColorModel() color.Model { return c.Model }
+func (c convert) Bounds() image.Rectangle { return c.Image.Bounds() }
+func (c convert) At(x, y int) color.Color { return c.Model.Convert(c.Image.At(x, y)) }
+
+func grayscale(img image.Image) image.Image {
+	return convert{img, color.GrayModel}
+}
+
+func main() {
+	err := processImage(grayscale)
+	if err != nil {
+		panic(err)
+	}
+}

pkg/merge/merge.go

@@ -0,0 +1,44 @@
+package main
+
+import (
+	"image"
+	"image/color"
+	_ "image/jpeg"
+	"image/png"
+	_ "image/png"
+	"os"
+)
+
+type Merge struct {
+	first, second image.Image
+}
+
+func (m Merge) ColorModel() color.Model { return m.first.ColorModel() }
+func (m Merge) Bounds() image.Rectangle { return m.first.Bounds() }
+
+func (m Merge) At(x, y int) color.Color {
+	if (x%2 != 0) && (y%2 != 0) {
+		return m.second.At(x, y)
+	}
+	return m.first.At(x, y)
+}
+
+func main() {
+	f1, err := os.Open(os.Args[1])
+	if err != nil {
+		panic(err)
+	}
+	f2, err := os.Open(os.Args[2])
+	if err != nil {
+		panic(err)
+	}
+	img1, _, err := image.Decode(f1)
+	if err != nil {
+		panic(err)
+	}
+	img2, _, err := image.Decode(f2)
+	if err != nil {
+		panic(err)
+	}
+	png.Encode(os.Stdout, Merge{img1, img2})
+}

pkg/merge/palette.go

@@ -0,0 +1,152 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"image"
+	"image/color"
+	_ "image/jpeg"
+	"image/png"
+	_ "image/png"
+	"os"
+
+	"slices"
+)
+
+func paletteFromImage(img image.Image) (p []color.Color) {
+	for i := 0; i < img.Bounds().Dx(); i++ {
+		p = append(p, img.At(i, 0))
+	}
+	return
+}
+
+func parseHexColor(s string) (c color.RGBA, err error) {
+	c.A = 0xff
+	switch len(s) {
+	case 7:
+		_, err = fmt.Sscanf(s, "#%02x%02x%02x", &c.R, &c.G, &c.B)
+	case 4:
+		_, err = fmt.Sscanf(s, "#%1x%1x%1x", &c.R, &c.G, &c.B)
+		// Double the hex digits:
+		c.R *= 17
+		c.G *= 17
+		c.B *= 17
+	default:
+		err = fmt.Errorf("invalid length, must be 7 or 4")
+
+	}
+	return
+}
+
+func mean(c1, c2 color.Color) color.Color {
+	r1, g1, b1, _ := c1.RGBA()
+	r2, g2, b2, _ := c2.RGBA()
+	return color.RGBA{
+		uint8((r1 + r2) / 2),
+		uint8((g1 + g2) / 2),
+		uint8((b1 + b2) / 2),
+		0xFF,
+	}
+}
+
+type Convert struct {
+	image.Image
+	color.Palette
+}
+
+func (c Convert) ColorModel() color.Model { return c.Image.ColorModel() }
+func (c Convert) Bounds() image.Rectangle { return c.Image.Bounds() }
+func (c Convert) At(x, y int) color.Color {
+	if isMeanCloser(c.Palette, c.Image.At(x, y)) {
+		first, second := twoClosest(c.Palette, c.Image.At(x, y))
+		// chessboard texture
+		if (x%2 != 0) && (y%2 != 0) || (x%2 == 0) && (y%2 == 0) {
+			return first
+		}
+		return second
+	}
+	return c.Palette.Convert(c.Image.At(x, y))
+}
+
+func twoClosest(p color.Palette, c color.Color) (first, second color.Color) {
+	first = p.Convert(c)
+	i := p.Index(c)
+	p2 := slices.Delete(slices.Clone(p), i, i+1)
+	second = p2.Convert(c)
+	return
+}
+
+func isMeanCloser(p color.Palette, c color.Color) bool {
+	first, second := twoClosest(p, c)
+	mp := color.Palette{first, mean(first, second), second}
+	i := mp.Index(c)
+	return i == mp.Index(mean(first, second))
+}
+
+func main() {
+	paletteFile := flag.String("p", "", "provide palette file")
+	flag.Parse()
+
+	var palette []color.Color
+
+	var colors []string
+	_ = []string{
+		"#ffffec", // soft-white
+		"#ff0000", // red
+		"#00ff00", // green
+		"#0000ff", // blue
+		"#000000", // black
+	}
+	funniPalette := []string{
+		"#ffffec",
+		"#000000",
+		"#4a3544",
+		"#757575",
+		"#8e8e8e",
+		"#666666",
+		"#4c4c4c",
+		"#3b3b3b",
+		"#949494",
+		"#ffffff",
+		"#665361",
+		"#3f3f3f",
+		"#525252",
+		"#838383",
+		"#111111",
+		"#070707",
+		"#b9b9b9",
+		"#dfdfdf",
+	}
+	colors = funniPalette
+	if *paletteFile != "" {
+		f, err := os.Open(*paletteFile)
+		if err != nil {
+			panic(err)
+		}
+		img, _, err := image.Decode(f)
+		if err != nil {
+			panic(err)
+		}
+		palette = paletteFromImage(img)
+	} else {
+		palette = func() (p []color.Color) {
+			for _, v := range colors {
+				c, err := parseHexColor(v)
+				if err != nil {
+					panic(err)
+				}
+				p = append(p, c)
+			}
+			return
+		}()
+	}
+	img, _, err := image.Decode(os.Stdin)
+	if err != nil {
+		panic(err)
+	}
+	palette = append(palette, color.RGBA{88, 88, 88, 0xFF})
+	err = png.Encode(os.Stdout, Convert{img, palette})
+	if err != nil {
+		panic(err)
+	}
+}

pkg/merge/readme.md

@@ -0,0 +1,5 @@
+experiments with palette and stuff
+
+---
+
+![alt text](converted.png)

pkg/mesh/9p.go

@@ -0,0 +1,41 @@
+//go:build ignore
+
+package main
+
+func ListenAndServe(addr string, filesystem fs.FS) error {
+	styx.HandlerFunc(func(s *styx.Session) {
+		for s.Next() {
+			switch msg := s.Request.(type) {
+			case styx.Twalk:
+				msg.Rwalk(fs.Stat(filesystem, msg.Path()))
+			case styx.Topen:
+				msg.Ropen(filesystem.Open(msg.Path()))
+			case styx.Tstat:
+				msg.Rstat(fs.Stat(filesystem, msg.Path()))
+			}
+		}
+	},
+	)
+}
+
+type FS struct {
+	meshFile
+}
+
+type meshFile struct {
+}
+
+type meshFileInfo struct {
+	bufio.Reader
+	time.Time
+}
+
+func (f meshFileInfo) Name() string       { return "mesh" }
+func (f meshFileInfo) Size() int64        { return f.Reader.Size() }
+func (f meshFileInfo) Mode() fs.FileMode  { return fs.ModePerm }
+func (f meshFileInfo) ModTime() time.Time { return f.Time }
+func (f meshFileInfo) IsDir() bool        { return false }
+func (f meshFileInfo) Sys() any           { return nil }
+
+func (f meshFile) Stat() (fs.FileInfo, error) {
+}

pkg/mesh/mesh.go

@@ -0,0 +1,93 @@
+package main
+
+import (
+	"flag"
+	"image"
+	"image/color"
+	"image/draw"
+	"image/png"
+	"os"
+	"time"
+
+	"github.com/golang/freetype/truetype"
+	"golang.org/x/image/font"
+	"golang.org/x/image/font/gofont/gomono"
+	"golang.org/x/image/math/fixed"
+
+	"git.nkpl.cc/twocookedfaggots/imageutils/pkg/mesh/wallpaper"
+	//	"github.com/droyo/styx"
+	//	"io/fs"
+)
+
+type Mesh struct {
+	image.Image
+	X, Y int // divide
+}
+
+// using source's color.Model
+func (mesh Mesh) ColorModel() color.Model { return mesh.Image.ColorModel() }
+
+// using source's image.Rectangle
+func (mesh Mesh) Bounds() image.Rectangle { return mesh.Image.Bounds() }
+func (mesh Mesh) At(x, y int) color.Color {
+	dx, dy := mesh.Image.Bounds().Dx(), mesh.Image.Bounds().Dy()
+	if (x%(dx/mesh.X)) == 0 || (y%(dy/mesh.Y)) == 0 {
+		return color.Black
+	}
+	return mesh.Image.At(x, y)
+}
+
+func render(img image.Image) draw.Image {
+	dst := image.NewRGBA(img.Bounds())
+	draw.Draw(dst, dst.Bounds(), img, image.Point{}, draw.Src)
+	return dst
+}
+
+func main() {
+	//	x := flag.Int("x", 2, "use to grid by x axis")
+	//	y := flag.Int("y", 2, "use to grid by y axis")
+	flag.Parse() // now flags is ready to use
+
+	img, err := png.Decode(os.Stdin)
+	if err != nil {
+		panic(err)
+	}
+	//		Mesh{ // our image modifyer
+	//			Image: img,
+	//			X:     *x,
+	//			Y:     *y,
+	//		},
+
+	dst := render(
+		img,
+	)
+
+	f, err := truetype.Parse(gomono.TTF)
+	if err != nil {
+		panic(err)
+	}
+	face := truetype.NewFace(f, &truetype.Options{
+		Size:    float64(img.Bounds().Dx() / 19),
+		DPI:     72,
+		Hinting: font.HintingNone,
+	})
+
+	d := &font.Drawer{
+		Dst:  dst,
+		Src:  image.NewUniform(color.Black),
+		Face: face,
+		Dot: fixed.Point26_6{fixed.Int26_6(img.Bounds().Dx() /
+			9 * 64,
+		),
+			fixed.Int26_6(img.Bounds().Dy() /
+				5 * 64,
+			),
+		},
+	}
+	d.DrawString(time.Now().Format(time.Kitchen))
+
+	err = wallpaper.Wallpaper(dst)
+	if err != nil {
+		panic(err)
+	}
+}

pkg/mesh/test_cmd.go

@@ -0,0 +1,23 @@
+package main
+
+import (
+	"os"
+	"os/exec"
+)
+
+func main() {
+	f, err := os.Open("/home/potassium/documents/wallpaper/8.png")
+	if err != nil {
+		panic(err)
+	}
+	cmd := exec.Command(
+		"swaybg",
+		"--image", "/dev/stdin",
+	)
+	cmd.Stderr = os.Stderr
+	cmd.Stdin = f
+	err = cmd.Run()
+	if err != nil {
+		panic(err)
+	}
+}

pkg/mesh/wallpaper/swaybg.go

@@ -0,0 +1,37 @@
+package wallpaper
+
+import (
+	"bytes"
+	"image"
+	"image/png"
+	"os"
+	"os/exec"
+)
+
+var err error
+
+func Wallpaper(img image.Image) error {
+	/*
+		cmd := exec.Command(
+			"swaybg",
+			"--image", "/dev/stdin",
+			"--mode", "fill",
+		)
+	*/
+	cmd := exec.Command("imv", "/dev/stdin")
+
+	var buf = new(bytes.Buffer)
+	err := png.Encode(buf, img)
+	if err != nil {
+		panic(err)
+	}
+
+	cmd.Stderr = os.Stdout
+	cmd.Stdin = buf
+
+	err = cmd.Run()
+	if err != nil {
+		return err
+	}
+	return nil
+}

pkg/mkpalette/palette.go

@@ -0,0 +1,67 @@
+package main
+
+import (
+	"encoding/csv"
+	"fmt"
+	"image/color"
+	"image/png"
+	"maps"
+	"os"
+	"slices"
+
+	imgutil "git.nkpl.cc/twocookedfaggots/imageutils/pkg"
+)
+
+func check(err error) {
+	if err != nil {
+		panic(err)
+	}
+}
+
+type Set[S comparable] map[S]struct{}
+
+func (s Set[S]) Add(v S) {
+	s[v] = struct{}{}
+}
+
+func (s Set[S]) Contains(v S) bool {
+	_, ok := s[v]
+	return ok
+}
+
+func Map[S1 ~[]T1, S2 ~[]T2, T1, T2 any](s S1, f func(T1) T2) S2 {
+	result := make(S2, len(s))
+	for i := range s {
+		result[i] = f(s[i])
+	}
+	return result
+}
+
+type hex string
+
+func (h hex) String() string {
+	return string(fmt.Sprintf("hex value: %s\n", string(h)))
+}
+
+func main() {
+	img, err := png.Decode(os.Stdin)
+	check(err)
+	p := Set[color.Color]{}
+	for y := 0; y < img.Bounds().Dy(); y++ {
+		for x := 0; x < img.Bounds().Dx(); x++ {
+			p.Add(img.At(x, y))
+		}
+	}
+	w := csv.NewWriter(os.Stdout)
+	s := Map[color.Palette, []string](
+		slices.Collect(maps.Keys(p)), imgutil.ColorToHex,
+	)
+	/*
+		h := make([]hex, 0, len(s))
+		for i := range s {
+			h = append(h, hex(s[i]))
+		}
+	*/
+	err = w.Write(s)
+	check(err)
+}

pkg/negate/minus19blue.go

@@ -0,0 +1,39 @@
+//go:build ignore
+
+package main
+
+import (
+	"image"
+	"image/color"
+	"image/png"
+	"os"
+)
+
+type Reshade struct{ image.Image }
+
+func (rs Reshade) ColorModel() color.Model { return rs.Image.ColorModel() }
+func (rs Reshade) Bounds() image.Rectangle { return rs.Image.Bounds() }
+func (rs Reshade) At(x, y int) color.Color {
+	c := rs.Image.At(x, y)
+	r, g, b, a := c.RGBA()
+	// minus 19 blue
+	return color.RGBA{
+		uint8(r >> 8),
+		uint8(g >> 8),
+		uint8(b>>8) - 8*8,
+		uint8(a >> 8),
+	}
+}
+
+func check(err error) {
+	if err != nil {
+		panic(err)
+	}
+}
+
+func main() {
+	img, err := png.Decode(os.Stdin)
+	check(err)
+	err = png.Encode(os.Stdout, Reshade{img})
+	check(err)
+}

pkg/negate/mixed.go

@@ -0,0 +1,70 @@
+package main
+
+import (
+	"image"
+	"image/color"
+	"image/png"
+	"math/rand"
+	"os"
+)
+
+type MixedNegation struct {
+	src     image.Image
+	counter int
+}
+
+func toRGBA(c color.Color) color.RGBA {
+	r, g, b, a := c.RGBA()
+	return color.RGBA{
+		R: uint8(r >> 8),
+		G: uint8(g >> 8),
+		B: uint8(b >> 8),
+		A: uint8(a >> 8),
+	}
+}
+
+func negateRGBA(c color.RGBA) color.RGBA {
+	c.R = 255 - c.R
+	c.G = 255 - c.G
+	c.B = 255 - c.B
+	return c
+}
+
+func Negate(c color.Color) color.Color {
+	return negateRGBA(toRGBA(c))
+}
+
+func randomBool() bool {
+	return rand.Intn(3) == 0
+}
+
+func (mn MixedNegation) ColorModel() color.Model { return mn.src.ColorModel() }
+func (mn MixedNegation) Bounds() image.Rectangle { return mn.src.Bounds() }
+func (mn *MixedNegation) At(x, y int) color.Color {
+	if (x%1 != 0) && (y%8 != 0) {
+		if randomBool() {
+			return Negate(mn.src.At(x, y))
+		}
+
+	}
+	return mn.src.At(x, y)
+}
+
+func pixelCount(img image.Image) int {
+	return img.Bounds().Dx() * img.Bounds().Dy()
+}
+
+func main() {
+	img, err := png.Decode(os.Stdin)
+	if err != nil {
+		panic(err)
+	}
+
+	n := pixelCount(img)
+	println(n)
+
+	err = png.Encode(os.Stdout, &MixedNegation{src: img, counter: n})
+	if err != nil {
+		panic(err)
+	}
+}

pkg/negate/negate.go

@@ -0,0 +1,41 @@
+package main
+
+import (
+	"image"
+	"image/color"
+	"image/png"
+	"os"
+
+	"git.nkpl.cc/twocookedfaggots/imageutils/util"
+)
+
+func NegateRGBA(c color.RGBA) color.RGBA {
+	c.R = 255 - c.R
+	c.G = 255 - c.G
+	c.B = 255 - c.B
+	return c
+}
+
+type Negate struct{ image.Image }
+
+func (n Negate) ColorModel() color.Model { return n.Image.ColorModel() }
+func (n Negate) Bounds() image.Rectangle { return n.Image.Bounds() }
+func (n Negate) At(x, y int) color.Color {
+	c := n.Image.At(x, y)
+	r, g, b, a := c.RGBA()
+	RGBAColor := color.RGBA{
+		R: uint8(r >> 8),
+		G: uint8(g >> 8),
+		B: uint8(b >> 8),
+		A: uint8(a >> 8),
+	}
+	return NegateRGBA(RGBAColor)
+}
+
+func main() {
+	if err := util.ProcessStdio(func(img image.Image) image.Image {
+		return Negate{img}
+	}); err != nil {
+		panic(err)
+	}
+}

pkg/showpalette/show.go

@@ -0,0 +1,74 @@
+package main
+
+import (
+	"encoding/csv"
+	"image"
+	"image/color"
+	"image/png"
+	"math"
+	"os"
+
+	imgutil "git.nkpl.cc/twocookedfaggots/imageutils/pkg"
+)
+
+func nearestHighSqrt(n int) int {
+	if math.Mod(math.Sqrt(float64(n)), 1) == 0 {
+		return n
+	}
+	return nearestHighSqrt(n + 1)
+}
+
+type showColors struct {
+	color.Palette
+}
+
+func (s showColors) ColorModel() color.Model {
+	return color.RGBAModel
+}
+
+func (s showColors) Bounds() image.Rectangle {
+	n := nearestHighSqrt(len(s.Palette))
+	return image.Rect(0, 0, n, n)
+}
+
+func (s showColors) At(x, y int) color.Color {
+	n := nearestHighSqrt(len(s.Palette))
+	return s.Palette[y*n+x]
+}
+
+func check(err error) {
+	if err != nil {
+		panic(err)
+	}
+}
+
+func Must[T any](v T, err error) T {
+	check(err)
+	return v
+}
+
+func Map[S1 ~[]T1, S2 ~[]T2, T1, T2 any](s S1, f func(T1) T2) S2 {
+	result := make(S2, len(s))
+	for i := range s {
+		result[i] = f(s[i])
+	}
+	return result
+}
+
+func main() {
+	r := csv.NewReader(os.Stdin)
+	r.TrailingComma = true
+	colors, err := r.Read()
+	check(err)
+	palette := color.Palette(
+		Map[[]string, color.Palette](colors,
+			func(v string) color.Color {
+				println(v + "cat-v")
+				return Must(imgutil.ParseHexColor(v))
+			},
+		),
+	)
+
+	err = png.Encode(os.Stdout, showColors{palette})
+	check(err)
+}

scale_test.go

@@ -8,7 +8,7 @@ import (
 	"io"
 	"testing"
 
-	"github.com/potassium5703/texture"
+	"git.nkpl.cc/twocookedfaggots/imageutils/pkg/texture"
 )
 
 func Render(img image.Image, rect image.Rectangle) image.Image {
@@ -21,11 +21,11 @@ func Render(img image.Image, rect image.Rectangle) image.Image {
 func BenchmarkScale(b *testing.B) {
 	for i := 0; i < b.N; i++ {
 		err := png.Encode(io.Discard,
-			Scale(Render(
+			Scale(64, Render(
 				texture.New(color.White,
 					color.Black, 2),
 				image.Rect(0, 0, 64, 64),
-			), 64),
+			)),
 		)
 		if err != nil {
 			panic(err)
@@ -33,10 +33,24 @@ func BenchmarkScale(b *testing.B) {
 	}
 }
 
+type SinglePixel struct{}
+
+func (s SinglePixel) At(x, y int) color.Color {
+	return color.White
+}
+
+func (s SinglePixel) ColorModel() color.Model {
+	return color.RGBAModel
+}
+
+func (s SinglePixel) Bounds() image.Rectangle {
+	return image.Rect(0, 0, 1, 1)
+}
+
 func BenchmarkSinglePixel(b *testing.B) {
 	instance := SinglePixel{}
 	err := png.Encode(io.Discard,
-		Scale(instance, b.N),
+		Scale(b.N, instance),
 	)
 	if err != nil {
 		panic(err)

transform.go

@@ -0,0 +1,5 @@
+package imageutils
+
+type Transformer interface {
+	Transform(image.Image) image.Image
+}

util.go

@@ -1,20 +0,0 @@
-package imageutils
-
-import (
-	"image"
-	"image/color"
-)
-
-type SinglePixel struct{}
-
-func (s SinglePixel) At(x, y int) color.Color {
-	return color.White
-}
-
-func (s SinglePixel) ColorModel() color.Model {
-	return color.RGBAModel
-}
-
-func (s SinglePixel) Bounds() image.Rectangle {
-	return image.Rect(0, 0, 1, 1)
-}

util/hex.go

@@ -0,0 +1,32 @@
+package util
+
+import (
+	"errors"
+	"fmt"
+	"image/color"
+)
+
+var ParseHexColorErr = errors.New("invalid length, must be 7 or 4")
+
+func ParseHexColor(s string) (c color.RGBA, err error) {
+	c.A = 0xff
+	switch len(s) {
+	case 7:
+		_, err = fmt.Sscanf(s, "#%02x%02x%02x", &c.R, &c.G, &c.B)
+	case 4:
+		_, err = fmt.Sscanf(s, "#%1x%1x%1x", &c.R, &c.G, &c.B)
+		// Double the hex digits:
+		c.R *= 17
+		c.G *= 17
+		c.B *= 17
+	default:
+		err = ParseHexColorErr
+
+	}
+	return
+}
+
+func ColorToHex(c color.Color) string {
+	r, g, b, _ := color.NRGBAModel.Convert(c).RGBA()
+	return fmt.Sprintf("#%02x%02x%02x", byte(r), byte(g), byte(b))
+}

util/hex_test.go

@@ -0,0 +1,47 @@
+package util
+
+import (
+	"fmt"
+	"image/png"
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+// Returns path of first occured file
+// with png extension in user's home directory.
+func firstPNG(root string) (filename string,
+	err error) {
+	var fn filepath.WalkFunc = func(path string,
+		info os.FileInfo,
+		fileErr error) error {
+		if fileErr != nil {
+			return fileErr
+		}
+		if !info.IsDir() &&
+			filepath.Ext(path) == ".png" {
+			filename = path
+			return nil
+		}
+		return nil
+	}
+	err = filepath.Walk(root, fn)
+	return
+}
+
+func TestColorToHex(t *testing.T) {
+	root := os.Getenv("HOME")
+	path, err := firstPNG(root)
+	if err != nil {
+		t.Fatal(err)
+	}
+	f, err := os.Open(path)
+	if err != nil {
+		t.Fatal(err)
+	}
+	img, err := png.Decode(f)
+	if err != nil {
+		t.Fatal(err)
+	}
+	fmt.Println(ColorToHex(img.At(0, 0)))
+}

util/stdio.go

@@ -0,0 +1,20 @@
+package util
+
+import (
+	"image"
+	"image/png"
+	"os"
+)
+
+// ProcessImage takes input png image from stdin, processes it with f and outputs it to stdout.
+func ProcessStdio(f func(image.Image) image.Image) error {
+	img, err := png.Decode(os.Stdin)
+	if err != nil {
+		return err
+	}
+	err = png.Encode(os.Stdout, f(img))
+	if err != nil {
+		return err
+	}
+	return err
+}