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ImgResize.go
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ImgResize.go
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package main
import (
"bytes"
"encoding/json"
"fmt"
"image"
"image/jpeg"
"image/png"
"io/ioutil"
"net/http"
"os"
"path/filepath"
"runtime"
"strings"
"github.com/peterhellberg/lossypng"
"github.com/nfnt/resize"
)
//ImageType for check
type ImageType int
const (
//Non do not know
Non ImageType = iota
//Png type of image
Png
//Jpeg type of image
Jpeg
)
type IosContents struct {
Images []IosImages `json:"images"`
Info IosInfo `json:"info"`
}
type IosImages struct {
Idiom string `json:"idiom"`
Filename string `json:"filename"`
Scale string `json:"scale"`
}
type IosInfo struct {
Version int `json:"version"`
Author string `json:"author"`
}
func main() {
// maximize CPU usage for maximum performance
runtime.GOMAXPROCS(runtime.NumCPU())
fmt.Println("Mission Start")
root, err := filepath.Abs(filepath.Dir(os.Args[0]))
if err != nil {
fmt.Println(err)
os.Exit(1)
}
root = root + "/"
fmt.Println("MAP:" + root)
androidRoot := root + "/android/"
// ldpiPath := androidRoot + "drawable-ldpi/"
mdpiPath := androidRoot + "drawable-mdpi/"
hdpiPath := androidRoot + "drawable-hdpi/"
xhdpiPath := androidRoot + "drawable-xhdpi/"
xxhdpiPath := androidRoot + "drawable-xxhdpi/"
xxxhdpiPath := androidRoot + "drawable-xxxhdpi/"
iosRoot := root + "/ios/"
flutterRoot := root + "/flutter/"
flutter1_5Path := flutterRoot + "/1.5x/"
flutter2_0Path := flutterRoot + "/2.0x/"
flutter3_0Path := flutterRoot + "/3.0x/"
flutter4_0Path := flutterRoot + "/4.0x/"
// mkDir(ldpiPath)
mkDir(mdpiPath)
mkDir(hdpiPath)
mkDir(xhdpiPath)
mkDir(xxhdpiPath)
mkDir(xxxhdpiPath)
mkDir(iosRoot)
mkDir(flutterRoot)
mkDir(flutter1_5Path)
mkDir(flutter2_0Path)
mkDir(flutter3_0Path)
mkDir(flutter4_0Path)
files, err := ioutil.ReadDir(root)
for _, f := range files {
if !f.IsDir() {
filePath := root + f.Name()
file, err := os.Open(filePath)
if err != nil {
fmt.Println(err)
os.Exit(1)
}
buff := make([]byte, 512) // why 512 bytes ? see http://golang.org/pkg/net/http/#DetectContentType
_, err = file.Read(buff)
filetype := http.DetectContentType(buff)
file.Close()
var t = Non
switch filetype {
case "image/jpeg", "image/jpg":
t = Jpeg
case "image/png":
t = Png
default:
}
if t != Non {
fmt.Println("Find target, name:" + f.Name())
getFilenameWithoutExt := getFilenameWithoutExt(f.Name())
pngName := getFilenameWithoutExt + ".png"
iOSInfo := IosInfo{
Version: 1,
Author: "KNightING",
}
iosContents := IosContents{
Info: iOSInfo,
}
iOSImgGroup := iosRoot + getFilenameWithoutExt + ".imageset/"
mkDir(iOSImgGroup)
//@4x,drawable-xxxhdpi
targetPath := flutter4_0Path + pngName
androidPath := xxxhdpiPath + pngName
if t != Png {
if imgResize(t, filePath, 1.0, targetPath) {
copyFile(targetPath, androidPath)
} else {
fmt.Println("Mission fail at 4x")
}
} else {
copyFile(filePath, targetPath)
copyFile(filePath, androidPath)
}
//@3x,drawable-xxhdpi
targetPath = flutter3_0Path + pngName
iOSFileName := getFilenameWithoutExt + "@3x.png"
iOSPath := iOSImgGroup + iOSFileName
androidPath = xxhdpiPath + pngName
if imgResize(t, filePath, 3.0/4, targetPath) {
iosContents.Images = append(iosContents.Images, IosImages{
Idiom: "universal",
Filename: iOSFileName,
Scale: "3x",
})
copyFile(targetPath, iOSPath)
copyFile(targetPath, androidPath)
} else {
fmt.Println("Mission fail at 3x")
}
//@2x,drawable-xhdpi
targetPath = flutter2_0Path + pngName
iOSFileName = getFilenameWithoutExt + "@2x.png"
iOSPath = iOSImgGroup + iOSFileName
androidPath = xhdpiPath + pngName
if imgResize(t, filePath, 2.0/4, targetPath) {
iosContents.Images = append(iosContents.Images, IosImages{
Idiom: "universal",
Filename: iOSFileName,
Scale: "2x",
})
copyFile(targetPath, iOSPath)
copyFile(targetPath, androidPath)
} else {
fmt.Println("Mission fail at 2x")
}
//@1.5x,drawable-hdpi
targetPath = flutter1_5Path + pngName
androidPath = hdpiPath + pngName
if imgResize(t, filePath, 3.0/8, targetPath) {
copyFile(targetPath, androidPath)
} else {
fmt.Println("Mission fail at 1.5x")
}
//@1x,drawable-mhdpi
targetPath = flutterRoot + pngName
iOSPath = iOSImgGroup + pngName
androidPath = mdpiPath + pngName
if imgResize(t, filePath, 1.0/4, targetPath) {
iosContents.Images = append(iosContents.Images, IosImages{
Idiom: "universal",
Filename: pngName,
Scale: "1x",
})
copyFile(targetPath, iOSPath)
copyFile(targetPath, androidPath)
} else {
fmt.Println("Mission fail at 1x")
}
// //@4x,drawable-xxxhdpi
// targetPath = flutter4_0Path + f.Name()
// androidPath = xxxhdpiPath + f.Name()
// copyFile(filePath, targetPath)
// copyFile(filePath, androidPath)
writeIosContent(iOSImgGroup, iosContents)
fmt.Println("Knock down !!!")
}
}
}
fmt.Println("Mission Complete!!!")
fmt.Scanln()
os.Exit(0)
}
func mkDir(path string) error {
err := os.MkdirAll(path, os.ModePerm)
if err != nil && !os.IsExist(err) {
fmt.Println("Create dir error")
fmt.Println(err)
return err
}
return nil
}
func imgResizeWork(imgType ImageType, path string) {
// imgResize(imgType, path, 3.0/4) //@3x,drawable-xxhdpi
// imgResize(imgType, path, 2.0/4) //@2x,drawable-xhdpi
// imgResize(imgType, path, 3.0/8) //@1.5x,drawable-hdpi
// imgResize(imgType, path, 1.0/4) //@1x,drawable-mdpi
// imgResize(imgType, path, 3.0/16) //@0.75x,drawable-ldpi
}
func imgResize(imgType ImageType, path string, ratio float32, targetPath string) bool {
file, err := os.Open(path)
defer file.Close()
if err != nil {
fmt.Println(err)
return false
}
var img image.Image
if imgType == Png {
// decode png into image.Image
img, err = png.Decode(file)
}
if imgType == Jpeg {
// decode jpeg into image.Image
img, err = jpeg.Decode(file)
}
if err != nil {
fmt.Println(err)
return false
}
file.Close()
b := img.Bounds()
width := uint(float32(b.Max.X) * ratio)
height := uint(float32(b.Max.Y) * ratio)
img = resize.Resize(width, height, img, resize.Bilinear)
// out, err := os.Create(fmt.Sprintf("test_resized_%f.png", ratio))
// if err != nil {
// fmt.Println(err)
// }
// defer out.Close()
// jpeg.Encode(out, m, nil)
// write new image to file
img = lossypng.Optimize(img, lossypng.RGBAConversion, 10)
buf := new(bytes.Buffer)
// png.Encode(buf, img)
pngEncoder := png.Encoder{
CompressionLevel: png.BestCompression,
}
pngEncoder.Encode(buf, img)
// fileName := fmt.Sprintf("%s_%d.png", getFilenameWithoutExt(file.Name()), width)
err = ioutil.WriteFile(targetPath, buf.Bytes(), 0644)
if err != nil {
fmt.Println(err)
return false
}
return true
}
func getFilenameWithoutExt(filename string) string {
return strings.TrimSuffix(filename, filepath.Ext(filename))
}
func copyFile(src string, dst string) {
input, err := ioutil.ReadFile(src)
if err != nil {
fmt.Println(err)
return
}
err = ioutil.WriteFile(dst, input, 0644)
if err != nil {
fmt.Println("Error creating", dst)
fmt.Println(err)
return
}
}
func writeIosContent(groupPath string, contents IosContents) {
json, _ := json.Marshal(contents)
// fmt.Println(string(json))
ioutil.WriteFile(groupPath+"Contents.json", json, 0644)
}
/* build any platform
On Linux and mac
===MAC===
CGO_ENABLED=0 GOOS=darwin GOARCH=amd64 go build main.go
===LINUX===
CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build main.go
===WINDOWS===
CGO_ENABLED=0 GOOS=windows GOARCH=amd64 go build main.go
On Windows
===MAC===
SET CGO_ENABLED=0
SET GOOS=darwin
SET GOARCH=amd64
go build main.go
===LINUX===
SET CGO_ENABLED=0
SET GOOS=linux
SET GOARCH=amd64
go build main.go
===WINDOWS===
SET CGO_ENABLED=0
SET GOOS=windows
SET GOARCH=amd64
go build main.go
GOOS:目標平台的操作系統(darwin、freebsd、linux、windows)
GOARCH:目標平台的體系架構(386、amd64、arm)
交叉編譯不支持CGO所以要禁用它
*/