cmd

cmd/mkpalette/palette.go

@@ -0,0 +1,67 @@
+package main
+
+import (
+	"encoding/csv"
+	"fmt"
+	"image/color"
+	"image/png"
+	"maps"
+	"os"
+	"slices"
+
+	imgutil "git.niplace.ru/XoxJlopeZi4BB/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)
+}