forked from maxence-charriere/go-app
/
icon.go
62 lines (50 loc) · 1008 Bytes
/
icon.go
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package main
import (
"image"
"image/color"
"image/png"
"os"
"github.com/disintegration/imaging"
)
type iconInfo struct {
Name string
Width float64
Height float64
Scale float64
Padding bool
}
func generateIcons(original string, resizes ...iconInfo) error {
f, err := os.Open(original)
if err != nil {
return err
}
defer f.Close()
var img image.Image
if img, err = png.Decode(f); err != nil {
return err
}
for _, r := range resizes {
ow := int(r.Width * r.Scale)
oh := int(r.Height * r.Scale)
p := 0
if r.Padding {
p = int((8 * r.Height / 100) * r.Scale)
}
w := ow - p
h := oh - p
rimg := imaging.Fit(img, w, h, imaging.Lanczos)
if p != 0 {
background := imaging.New(ow, oh, color.NRGBA{0, 0, 0, 0})
rimg = imaging.PasteCenter(background, rimg)
}
var icon *os.File
if icon, err = os.Create(r.Name); err != nil {
return err
}
defer icon.Close()
if err = png.Encode(icon, rimg); err != nil {
return err
}
}
return nil
}