initial commit

Author: typomedia

.gitignore

@@ -0,0 +1,3 @@
+.idea/
+bin/
+go.sum

Makefile

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+build:
+	go mod tidy
+	go build -ldflags "-s -w" -o bin/ .
+
+icon:
+	go install github.com/akavel/rsrc@latest
+	rsrc -ico go.ico
+
+run:
+	go mod tidy
+	go run .
+
+windows: icon build

go.ico

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+module github.com/typomedia/iconize
+
+go 1.19
+
+require git.shangtai.net/staffan/go-ico v1.0.0-beta.2
+
+require golang.org/x/image v0.0.0-20211028202545-6944b10bf410

go.mod

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+package main
+
+import (
+	"bytes"
+	"fmt"
+	"image"
+	"image/color"
+	"log"
+	"os"
+	"path/filepath"
+	"time"
+
+	"git.shangtai.net/staffan/go-ico"
+	"golang.org/x/image/draw"
+)
+
+func main() {
+
+	start := time.Now()
+
+	if len(os.Args) < 2 {
+		os.Exit(1)
+	}
+	path := os.Args[1]
+
+	file, err := os.ReadFile(path)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	img, _, err := image.Decode(bytes.NewReader(file))
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	width, height := size(img)
+	size := max(width, height)
+
+	alpha := image.NewRGBA(image.Rect(0, 0, size, size))
+
+	rgba := color.RGBA{0, 0, 0, 0}
+	draw.Draw(alpha, alpha.Bounds(), &image.Uniform{C: rgba}, image.Point{}, draw.Src)
+
+	draw.Draw(alpha, img.Bounds().Add(
+		image.Point{
+			X: (size - img.Bounds().Dx()) / 2,
+			Y: (size - img.Bounds().Dy()) / 2,
+		}), img, image.Point{}, draw.Over)
+
+	basename := name(path)
+	icoFile, err := os.Create(basename + ".ico")
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer icoFile.Close()
+
+	icon := ico.NewIcon()
+	// https://learn.microsoft.com/en-us/windows/win32/uxguide/vis-icons
+	sizes := []int{128, 256}
+	for _, size := range sizes {
+		resizedImg := scale(alpha, size, size)
+		icon.AddPng(resizedImg)
+	}
+
+	t := time.Now()
+	elapsed := t.Sub(start)
+	fmt.Println("Elapsed:", elapsed)
+
+	enc, err := icon.Encode()
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	icoFile.Write(enc)
+	os.Exit(0)
+
+}
+
+func max(width, height int) int {
+	size := width
+	if height > width {
+		size = height
+	}
+	return size
+}
+
+func size(img image.Image) (int, int) {
+	width := img.Bounds().Max.X
+	height := img.Bounds().Max.Y
+	return width, height
+}
+
+func scale(img image.Image, width, height int) image.Image {
+	resizedImg := image.NewRGBA(image.Rect(0, 0, width, height))
+	draw.CatmullRom.Scale(resizedImg, resizedImg.Bounds(), img, img.Bounds(), draw.Over, nil)
+
+	return resizedImg
+}
+
+func name(filePath string) string {
+	fileName := filepath.Base(filePath)
+	extension := filepath.Ext(fileName)
+	return fileName[0 : len(fileName)-len(extension)]
+}