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images.go
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/
images.go
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package img
import (
"fmt"
"github.com/disintegration/imaging"
"golang.org/x/image/tiff"
"image"
"image/gif"
"image/jpeg"
"image/png"
"os"
"path/filepath"
"strings"
)
const IMAGE_FOLDER_TEMP = "temp-images"
const IMAGE_FOLDER_PERM = "perm-images"
func Resize(fileName string, size int, makeRectangle bool) (*image.NRGBA, error) {
width, height := size, size
i, err := imaging.Open(filepath.Join(IMAGE_FOLDER_TEMP, fileName))
if err != nil {
return nil, err
}
if i == nil {
return nil, fmt.Errorf("i=nil")
}
r := i.Bounds()
if makeRectangle {
if (r.Dx() / r.Dy()) > 1 {
dist := (r.Dx() - r.Dy()*2) / 2
rec := image.Rect(dist, 0, r.Dx()-dist, r.Dy())
i = imaging.Crop(i, rec)
}
if (r.Dy() / r.Dx()) > 1 {
dist := (r.Dy() - r.Dx()*2) / 2
rec := image.Rect(0, dist, r.Dx(), r.Dy()-dist)
i = imaging.Crop(i, rec)
}
}
if r.Dx() < r.Dy() {
width = 0
} else {
height = 0
}
i2 := imaging.Resize(i, width, height, imaging.Lanczos)
return i2, nil
}
func Format(fileName string, format string) (string, error) {
src, err := os.Open(filepath.Join(IMAGE_FOLDER_TEMP, fileName))
if err != nil {
return fileName, err
}
defer src.Close()
decodedImageData, _, err := image.Decode(src)
if err != nil {
return "", err
}
fileName = strings.Join([]string{strings.TrimSuffix(fileName, filepath.Ext(fileName)), format}, ".")
dst, err := os.OpenFile(filepath.Join(IMAGE_FOLDER_TEMP, fileName), os.O_WRONLY|os.O_CREATE, 0666)
defer dst.Close()
switch format {
case "jpg":
{
err = jpeg.Encode(dst, decodedImageData, nil)
}
case "png":
{
err = png.Encode(dst, decodedImageData)
}
case "tiff":
{
err = tiff.Encode(dst, decodedImageData, nil)
}
case "gif":
{
err = gif.Encode(dst, decodedImageData, nil)
}
default:
return "", fmt.Errorf("wrong format")
}
return fileName, err
}