You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
57 lines
1.0 KiB
57 lines
1.0 KiB
package utils
|
|
|
|
import (
|
|
"errors"
|
|
"github.com/nfnt/resize"
|
|
"golang.org/x/image/bmp"
|
|
"image"
|
|
"image/gif"
|
|
"image/jpeg"
|
|
"image/png"
|
|
"io"
|
|
"os"
|
|
)
|
|
|
|
func GenSmallImage(src, dst string) error {
|
|
fIn, _ := os.Open(src)
|
|
defer fIn.Close()
|
|
|
|
fOut, _ := os.Create(dst)
|
|
defer fOut.Close()
|
|
|
|
if err := scale(fIn, fOut, 0, 0, 0); err != nil {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func scale(in io.Reader, out io.Writer, width, height, quality int) error {
|
|
origin, fm, err := image.Decode(in)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if width == 0 || height == 0 {
|
|
width = origin.Bounds().Max.X / 2
|
|
height = origin.Bounds().Max.Y / 2
|
|
}
|
|
if quality == 0 {
|
|
quality = 25
|
|
}
|
|
canvas := resize.Thumbnail(uint(width), uint(height), origin, resize.Lanczos3)
|
|
|
|
switch fm {
|
|
case "jpeg":
|
|
return jpeg.Encode(out, canvas, &jpeg.Options{quality})
|
|
case "png":
|
|
return png.Encode(out, canvas)
|
|
case "gif":
|
|
return gif.Encode(out, canvas, &gif.Options{})
|
|
case "bmp":
|
|
return bmp.Encode(out, canvas)
|
|
default:
|
|
return errors.New("ERROR FORMAT")
|
|
}
|
|
|
|
return nil
|
|
}
|