Fix image quality

maptool-go/go.mod

@@ -0,0 +1,5 @@
+module gitea.hijack.moe/huashui/a3web/maptool
+
+go 1.13
+
+require github.com/disintegration/imaging v1.6.2 // indirect

maptool-go/go.sum

@@ -0,0 +1,5 @@
+github.com/disintegration/imaging v1.6.2 h1:w1LecBlG2Lnp8B3jk5zSuNqd7b4DXhcjwek1ei82L+c=
+github.com/disintegration/imaging v1.6.2/go.mod h1:44/5580QXChDfwIclfc/PCwrr44amcmDAg8hxG0Ewe4=
+golang.org/x/image v0.0.0-20191009234506-e7c1f5e7dbb8 h1:hVwzHzIUGRjiF7EcUjqNxk3NCfkPxbDKRdnNE1Rpg0U=
+golang.org/x/image v0.0.0-20191009234506-e7c1f5e7dbb8/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=

maptool-go/main.go

@@ -0,0 +1,91 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"image"
+	"image/color"
+	"image/jpeg"
+	"log"
+	"os"
+	"strings"
+	"sync"
+
+	"github.com/disintegration/imaging"
+)
+
+var (
+	origMap  string
+	maxLevel int
+)
+
+func init() {
+	flag.StringVar(&origMap, "map", "Enoch.png", "original map file")
+	flag.IntVar(&maxLevel, "level", 3, "resize level")
+}
+
+func main() {
+	flag.Parse()
+
+	origImgFile, err := os.Open(origMap)
+	if err != nil {
+		panic(err)
+	}
+	defer origImgFile.Close()
+
+	config, format, err := image.DecodeConfig(origImgFile)
+	if err != nil {
+		panic(err)
+	}
+	fmt.Println("Width:", config.Width, "Height:", config.Height, "Format:", format)
+
+	origImgFile.Seek(0, 0)
+	img, _, err := image.Decode(origImgFile)
+	if err != nil {
+		panic(err)
+	}
+	//////////////////////
+	width := config.Width
+	dirName := strings.Split(origMap, ".")[0]
+	os.Mkdir(dirName, os.ModeDir)
+
+	for i := 3; i > 0; i-- {
+		log.Println(i)
+		corpImage(img, width, i, dirName)
+		width = width / 2
+		img = imaging.Resize(img, width, 0, imaging.Lanczos)
+	}
+}
+
+type subImager interface {
+	SubImage(r image.Rectangle) image.Image
+}
+
+func corpImage(img image.Image, width int, level int, dirname string) {
+	lveledirname := fmt.Sprintf("%s/%d", dirname, level)
+	os.Mkdir(lveledirname, os.ModeDir)
+	var wg sync.WaitGroup
+	if img, ok := img.(subImager); ok {
+		for i := 0; i < width; i = i + 1000 {
+			for j := 0; j < width; j = j + 1000 {
+				wg.Add(1)
+				go func(wg *sync.WaitGroup, i, j int, img subImager) {
+					rect := image.Rect(i, j, i+1000, j+1000)
+					imgOut := img.SubImage(rect)
+					imgOut = imaging.Paste(imaging.New(1000, 1000, color.NRGBA{0, 0, 0, 0}), imgOut, image.Pt(0, 0))
+					fileName := fmt.Sprintf("%s/%d/x%d_y%d.jpg", dirname, level, i/1000, j/1000)
+					fileOut, err := os.Create(fileName)
+					if err != nil {
+						panic(err)
+					}
+					jpeg.Encode(fileOut, imgOut, &jpeg.Options{Quality: 85})
+					fileOut.Close()
+					wg.Done()
+				}(&wg, i, j, img)
+			}
+		}
+	} else {
+		log.Fatalln("Cannot take a SubImage")
+	}
+	wg.Wait()
+}