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decenc.go
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decenc.go
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package resizeimg
import (
"image"
"image/gif"
"image/jpeg"
"image/png"
"os"
)
func decgif(filename string) (image.Image, error) {
f, err := os.Open(filename)
if err != nil {
return nil, err
}
defer f.Close()
return gif.Decode(f)
}
func encgif(filename string, img image.Image) error {
f, err := os.Create(filename)
if err != nil {
return err
}
defer f.Close()
return gif.Encode(f, img, nil)
}
func decjpg(filename string) (image.Image, error) {
f, err := os.Open(filename)
if err != nil {
return nil, err
}
defer f.Close()
return jpeg.Decode(f)
}
func encjpg(filename string, img image.Image) error {
f, err := os.Create(filename)
if err != nil {
return err
}
defer f.Close()
return jpeg.Encode(f, img, nil)
}
func decpng(filename string) (image.Image, error) {
f, err := os.Open(filename)
if err != nil {
return nil, err
}
defer f.Close()
return png.Decode(f)
}
func encpng(filename string, img image.Image) error {
f, err := os.Create(filename)
if err != nil {
return err
}
defer f.Close()
return png.Encode(f, img)
}