Add new strategy for image resize.
This commit is contained in:
zicla
@ -7,6 +7,7 @@ import (
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"strconv"
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"github.com/disintegration/imaging"
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"net/url"
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"strings"
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)
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//@Service
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@ -40,6 +41,79 @@ func (this *ImageCacheService) Detail(uuid string) *ImageCache {
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return imageCache
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}
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//获取预处理时必要的参数
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func (this *ImageCacheService) ResizeParams(request *http.Request) (needProcess bool, resizeMode string, resizeWidth int, resizeHeight int) {
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var err error
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//老模式准备逐步废弃掉
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if request.FormValue("imageProcess") == "resize" {
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//老模式使用 imageResizeM,imageResizeW,imageResizeH
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imageResizeM := request.FormValue("imageResizeM")
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if imageResizeM == "" {
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imageResizeM = "fit"
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} else if imageResizeM != "fit" && imageResizeM != "fill" && imageResizeM != "fixed" {
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panic("imageResizeM参数错误")
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}
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imageResizeWStr := request.FormValue("imageResizeW")
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var imageResizeW int
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if imageResizeWStr != "" {
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imageResizeW, err = strconv.Atoi(imageResizeWStr)
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this.PanicError(err)
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if imageResizeW < 1 || imageResizeW > 4096 {
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panic("缩放尺寸不能超过4096")
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}
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}
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imageResizeHStr := request.FormValue("imageResizeH")
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var imageResizeH int
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if imageResizeHStr != "" {
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imageResizeH, err = strconv.Atoi(imageResizeHStr)
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this.PanicError(err)
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if imageResizeH < 1 || imageResizeH > 4096 {
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panic("缩放尺寸不能超过4096")
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}
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}
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return true, imageResizeM, imageResizeW, imageResizeH
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} else if request.FormValue("ir") != "" {
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//新模式使用 mode_w_h 如果w或者h为0表示这项值不设置
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imageResizeStr := request.FormValue("ir")
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arr := strings.Split(imageResizeStr, "_")
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if len(arr) != 3 {
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panic("参数不符合规范，格式要求为mode_w_h")
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}
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imageResizeM := arr[0]
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if imageResizeM == "" {
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imageResizeM = "fit"
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} else if imageResizeM != "fit" && imageResizeM != "fill" && imageResizeM != "fixed" {
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panic("imageResizeM参数错误")
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}
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imageResizeWStr := arr[1]
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var imageResizeW int
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if imageResizeWStr != "" {
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imageResizeW, err = strconv.Atoi(imageResizeWStr)
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this.PanicError(err)
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if imageResizeW < 0 || imageResizeW > 4096 {
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panic("缩放尺寸不能超过4096")
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}
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}
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imageResizeHStr := arr[2]
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var imageResizeH int
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if imageResizeHStr != "" {
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imageResizeH, err = strconv.Atoi(imageResizeHStr)
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this.PanicError(err)
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if imageResizeH < 0 || imageResizeH > 4096 {
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panic("缩放尺寸不能超过4096")
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}
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}
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return true, imageResizeM, imageResizeW, imageResizeH
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} else {
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LogInfo("没有有效的处理参数，不进行图片处理")
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return false, "", 0, 0
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}
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}
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//图片预处理功能。
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func (this *ImageCacheService) ResizeImage(request *http.Request, filePath string) *image.NRGBA {
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@ -47,47 +121,24 @@ func (this *ImageCacheService) ResizeImage(request *http.Request, filePath strin
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this.PanicError(err)
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defer diskFile.Close()
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imageResizeM := request.FormValue("imageResizeM")
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if imageResizeM == "" {
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imageResizeM = "fit"
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} else if imageResizeM != "fit" && imageResizeM != "fill" && imageResizeM != "fixed" {
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panic("imageResizeM参数错误")
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}
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imageResizeWStr := request.FormValue("imageResizeW")
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var imageResizeW int
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if imageResizeWStr != "" {
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imageResizeW, err = strconv.Atoi(imageResizeWStr)
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this.PanicError(err)
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if imageResizeW < 1 || imageResizeW > 4096 {
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panic("缩放尺寸不能超过4096")
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}
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}
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imageResizeHStr := request.FormValue("imageResizeH")
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var imageResizeH int
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if imageResizeHStr != "" {
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imageResizeH, err = strconv.Atoi(imageResizeHStr)
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this.PanicError(err)
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if imageResizeH < 1 || imageResizeH > 4096 {
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panic("缩放尺寸不能超过4096")
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}
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}
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_, imageResizeM, imageResizeW, imageResizeH := this.ResizeParams(request)
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//单边缩略
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if imageResizeM == "fit" {
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//将图缩略成宽度为100，高度按比例处理。
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if imageResizeW > 0 {
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if imageResizeW != 0 {
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src, err := imaging.Decode(diskFile)
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this.PanicError(err)
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return imaging.Resize(src, imageResizeW, 0, imaging.Lanczos)
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} else if imageResizeH > 0 {
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} else if imageResizeH != 0 {
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//将图缩略成高度为100，宽度按比例处理。
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src, err := imaging.Decode(diskFile)
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this.PanicError(err)
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return imaging.Resize(src, 0, imageResizeH, imaging.Lanczos)
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} else {
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panic("单边缩略必须指定imageResizeW或imageResizeH")
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panic("单边缩略必须指定宽或者高")
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}
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} else if imageResizeM == "fill" {
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//固定宽高，自动裁剪
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@ -97,7 +148,7 @@ func (this *ImageCacheService) ResizeImage(request *http.Request, filePath strin
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return imaging.Fill(src, imageResizeW, imageResizeH, imaging.Center, imaging.Lanczos)
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} else {
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panic("固定宽高，自动裁剪 必须同时指定imageResizeW和imageResizeH")
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panic("固定宽高，自动裁剪 必须同时指定宽和高")
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}
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} else if imageResizeM == "fixed" {
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//强制宽高缩略
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@ -107,7 +158,7 @@ func (this *ImageCacheService) ResizeImage(request *http.Request, filePath strin
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return imaging.Resize(src, imageResizeW, imageResizeH, imaging.Lanczos)
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} else {
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panic("强制宽高缩略必须同时指定imageResizeW和imageResizeH")
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panic("强制宽高缩略必须同时指定宽和高")
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}
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} else {
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panic("不支持" + imageResizeM + "处理模式")
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