无损压缩GIF
This commit is contained in:
52
bin/main.go
52
bin/main.go
@@ -18,17 +18,61 @@ import (
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)
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func init() {
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// 设置日志格式
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log.SetFlags(log.Ldate | log.Ltime | log.Lshortfile)
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}
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// 实现一个 web api 服务(获取指定尺寸的图片)
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// string 转换为 int, 如果转换失败则返回默认值
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func stringToInt(str string, defaultValue int) int {
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if str == "" {
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return defaultValue
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}
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value, err := strconv.Atoi(str)
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if err != nil {
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return defaultValue
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}
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return value
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}
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func main() {
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runtime.GOMAXPROCS(runtime.NumCPU())
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models.GetMysql() // 测试连接数据库
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var mysqlConnection models.MysqlConnection
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mysqlConnection.Init()
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// 直接走 CDN 的请求不缓存本地, 因此直接使用参数
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http.HandleFunc("/webp/", func(w http.ResponseWriter, r *http.Request) {
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log.Println(r.Method, r.URL.Path)
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// URL 格式: /img/{id}.{格式}?width=320&height=320&fit=cover
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reg := regexp.MustCompile(`^/webp/([0-9a-zA-Z]+).(jpg|jpeg|png|webp)$`)
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matches := reg.FindStringSubmatch(r.URL.Path)
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if len(matches) != 3 {
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log.Println("URL 格式错误", matches)
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w.WriteHeader(http.StatusNotFound)
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return
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}
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id, format, width, height, fit := matches[1], matches[2], stringToInt(r.URL.Query().Get("width"), 0), stringToInt(r.URL.Query().Get("height"), 0), r.URL.Query().Get("fit")
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content, err := mysqlConnection.GetImageContent(id)
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if err != nil {
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log.Println("获取图片失败", format, err)
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w.WriteHeader(http.StatusBadRequest)
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}
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var img models.Image
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img.Init(content)
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data, err := img.ToWebP(width, height, fit)
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if err != nil {
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log.Println("转换图片失败", err)
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w.WriteHeader(http.StatusBadRequest)
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}
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w.Header().Set("Content-Type", "image/webp")
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w.Header().Set("Cache-Control", "max-age=31536000")
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w.Write(data)
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})
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http.HandleFunc("/img/", func(w http.ResponseWriter, r *http.Request) {
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// URL 格式: /img/{id}-{version}@{倍图}{宽度}.{格式}
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reg := regexp.MustCompile(`^/img/([0-9a-zA-Z]+)-([0-9a-zA-Z]+)@([0-9]{1,4})x([0-9]{1,4}).(jpg|jpeg|png|webp)$`)
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matches := reg.FindStringSubmatch(r.URL.Path)
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@@ -28,7 +28,7 @@ func 生成配置文件() {
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viper.Set("mysql.charset", "utf8mb4")
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viper.Set("mysql.maxOpenConns", 100)
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viper.Set("oss.host", "")
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viper.Set("oss.accessId", "")
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viper.Set("oss.endpoint", "")
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viper.Set("oss.accessID", "")
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viper.Set("oss.accessKey", "")
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}
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121
models/image.go
Normal file
121
models/image.go
Normal file
@@ -0,0 +1,121 @@
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package models
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import (
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"image"
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"io/ioutil"
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"log"
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"net/http"
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"regexp"
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"github.com/chai2010/webp"
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"github.com/disintegration/imaging"
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giftowebp "github.com/sizeofint/gif-to-webp"
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)
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// Image is a struct that contains the information of an image
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type Image struct {
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image image.Image
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format string
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data []byte
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}
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// 初始化图片
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func (img *Image) Init(content string) {
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if len(regexp.MustCompile(`image.gameuiux.cn`).FindStringSubmatch(content)) > 0 {
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key := regexp.MustCompile(`^https?://image.gameuiux.cn/`).ReplaceAllString(content, "")
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// 从OSS中读取图片
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bucket := GetBucket("gameui-image2")
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body, err := bucket.GetObject(key)
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if err != nil {
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log.Println("读取图片失败", err)
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return
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}
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defer body.Close()
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// 判断图片格式是否为 gif 或 GIF
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if len(regexp.MustCompile(`\.gif$`).FindStringSubmatch(key)) > 0 {
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img.format = "gif"
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img.data, err = ioutil.ReadAll(body)
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if err != nil {
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log.Println("读取图片失败", err)
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return
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}
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return
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}
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// 将文件解码为 image.Image
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img.image, img.format, err = image.Decode(body)
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if err != nil {
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log.Println("解码图像失败", err)
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return
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}
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return
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} else {
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log.Println("直接从网络下载图片:", content)
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resp, err := http.Get(content)
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if err != nil {
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log.Println("下载图片失败", err)
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return
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}
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defer resp.Body.Close()
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// 判断图片格式是否为 gif 或 GIF
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if len(regexp.MustCompile(`\.gif$`).FindStringSubmatch(content)) > 0 {
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img.format = "gif"
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img.data, err = ioutil.ReadAll(resp.Body)
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if err != nil {
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log.Println("读取图片失败", err)
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return
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}
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println("数据长度:", len(img.data))
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return
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}
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// 将文件解码为 image.Image
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img.image, img.format, err = image.Decode(resp.Body)
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if err != nil {
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log.Println("解码图像失败", err)
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return
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}
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}
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}
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// 将图片输出为指定尺寸的 webp 格式(默认使用 Lanczos 缩放算法)
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func (img *Image) ToWebP(width int, height int, fit string) ([]byte, error) {
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// 如果原图是GIF格式的动态图片，直接不作尺寸处理，直接转换为webp格式
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if img.format == "gif" {
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converter := giftowebp.NewConverter()
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converter.LoopCompatibility = true // 是否兼容循环动画
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converter.WebPConfig.SetLossless(1) // 0 有损压缩 1无损压缩
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converter.WebPConfig.SetMethod(6) // 压缩速度 0-6 0最快 6质量最好
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converter.WebPConfig.SetQuality(100) // 压缩质量 0-100
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converter.WebPAnimEncoderOptions.SetKmin(9)
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converter.WebPAnimEncoderOptions.SetKmax(17)
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return converter.Convert(img.data)
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}
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// 如果指定了宽高却没有指定fit, 则默认fit为cover
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if width != 0 && height != 0 && fit == "" {
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fit = "cover"
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}
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// 如果未指定宽高和fit, 则不缩放图片直接返回webp
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if width == 0 && height == 0 && fit == "" {
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return webp.EncodeRGBA(img.image, 100)
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}
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switch fit {
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case "cover":
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return webp.EncodeRGBA(imaging.Fill(img.image, width, height, imaging.Center, imaging.Lanczos), 100)
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case "contain":
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return webp.EncodeRGBA(imaging.Fit(img.image, width, height, imaging.Lanczos), 100)
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case "fill":
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return webp.EncodeRGBA(imaging.Fill(img.image, width, height, imaging.Center, imaging.Lanczos), 100)
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case "inside":
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return webp.EncodeRGBA(imaging.Fit(img.image, width, height, imaging.Lanczos), 100)
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case "outside":
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return webp.EncodeRGBA(imaging.Fill(img.image, width, height, imaging.Center, imaging.Lanczos), 100)
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case "scale-down":
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return webp.EncodeRGBA(imaging.Fit(img.image, width, height, imaging.Lanczos), 100)
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default:
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return webp.EncodeRGBA(imaging.Resize(img.image, width, height, imaging.Lanczos), 100)
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}
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}
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@@ -8,7 +8,12 @@ import (
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_ "github.com/go-sql-driver/mysql"
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)
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func GetMysql() {
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type MysqlConnection struct {
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db *sql.DB
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}
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// 初始化数据库连接
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func (m *MysqlConnection) Init() (err error) {
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viper := Viper // 从 models/config.go 中获取 viper 对象
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user := viper.Get("mysql.user").(string)
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password := viper.Get("mysql.password").(string)
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@@ -16,29 +21,17 @@ func GetMysql() {
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port := viper.Get("mysql.port").(int)
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database := viper.Get("mysql.database").(string)
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sqlconf := user + ":" + password + "@tcp(" + host + ":" + strconv.Itoa(port) + ")/" + database + "?charset=utf8mb4&parseTime=True&loc=Local"
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// 连接数据库
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db, err := sql.Open("mysql", sqlconf)
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m.db, err = sql.Open("mysql", sqlconf) // 连接数据库
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if err != nil {
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log.Println("连接数据库失败", err)
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return
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}
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// 从 web_images 表读取图片 id, version, width, height, format
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rows, err := db.Query("SELECT id, width, height, content FROM web_images WHERE id = 8888")
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if err != nil {
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log.Println("查询数据库失败", err)
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return
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}
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defer rows.Close()
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// 遍历查询结果
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for rows.Next() {
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var id, width, height, content string
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if err = rows.Scan(&id, &width, &height, &content); err != nil {
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log.Println("读取数据库失败", err)
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return
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}
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log.Println(id, width, height, content)
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}
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}
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// 根据 id 获取图片的 content
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func (m *MysqlConnection) GetImageContent(id string) (key string, err error) {
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var content string
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err = m.db.QueryRow("SELECT content FROM web_images WHERE id=" + id).Scan(&content)
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return content, err
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}
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@@ -1,55 +0,0 @@
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package models
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import (
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//"gocv.io/x/gocv"
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//"github.com/xuyu/gotool/torch"
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"fmt"
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"github.com/wangkuiyi/gotorch"
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)
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func init() {
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// 模型文件地址: https://download.pytorch.org/models/resnet50-19c8e357.pth
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// 模型地址: "/home/satori/webp/data/resnet-50.t7"
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tensor := gotorch.Load("/home/satori/webp/data/resnet-50.t7")
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fmt.Println(tensor)
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//model := torch.NewModel()
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//err := model.ReadFromFile("/home/satori/webp/data/resnet-50.t7")
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//if err != nil {
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// panic(err)
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//}
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/**
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t7 := "/home/satori/webp/data/resnet-50.t7"
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// 加载t7格式的模型
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model := gocv.ReadNetFromTorch(t7)
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if model.Empty() {
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panic("Failed to load model")
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}
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fmt.Println("==============================")
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img := gocv.IMRead("data/test.jpeg", gocv.IMReadColor)
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if img.Empty() {
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panic("Failed to read image")
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}
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fmt.Println("==============================")
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inputBlob := gocv.BlobFromImage(img, 1.0, image.Pt(224, 224), gocv.NewScalar(0, 0, 0, 0), true, false)
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defer inputBlob.Close()
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fmt.Println("==============================")
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model.SetInput(inputBlob, "input")
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outputBlob := model.Forward("output")
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defer outputBlob.Close()
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fmt.Println("==============================")
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features := outputBlob.Reshape(1, 1)
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defer features.Close()
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fmt.Println("==============================")
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fmt.Println(features.ToBytes())
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**/
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}
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