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cape.go
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/
cape.go
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package main
import (
"bytes"
"fmt"
"image"
"image/png"
"log"
"net/http"
"github.com/nfnt/resize"
"github.com/oliamb/cutter"
)
func getCapeImg(username string) (image.Image, error) {
resp, err := http.Get(fmt.Sprintf("http://s.optifine.net/capes/%v.png", username))
if err != nil {
return nil, err
}
defer resp.Body.Close()
if resp.StatusCode == 200 {
img, _ := png.Decode(resp.Body)
return img, nil
}
return nil, fmt.Errorf("cape not found on user %v", username)
}
func cropCape(cape image.Image) (image.Image, bool, error) {
var config cutter.Config
var customCape bool
bounds := cape.Bounds()
if bounds.Max.X == 46 {
config = cutter.Config{
Width: 10,
Height: 16,
Anchor: image.Point{1, 1},
Mode: cutter.TopLeft,
}
customCape = false
} else if bounds.Max.X == 92 {
config = cutter.Config{
Width: 20,
Height: 32,
Anchor: image.Point{2, 2},
Mode: cutter.TopLeft,
}
customCape = true
} else {
return nil, false, fmt.Errorf("invalid cape size of %v", bounds.Max.X)
}
croppedImg, err := cutter.Crop(cape, config)
if err != nil {
log.Fatal(err)
}
return croppedImg, customCape, nil
}
func scaleCape(cape image.Image, scale int, customCape bool) (image.Image, error) {
var xSize uint = uint(cape.Bounds().Max.X)
scaleTo := xSize * uint(scale)
if !customCape {
scaleTo *= 2
}
m := resize.Resize(scaleTo, 0, cape, resize.NearestNeighbor)
return m, nil
}
func getCapeBytes(username string, scale int) ([]byte, error) {
originalImage, err := getCapeImg(username)
if err != nil {
return []byte{}, err
}
croppedCape, isCustomCape, err := cropCape(originalImage)
if err != nil {
return []byte{}, err
}
scaledCape, err := scaleCape(croppedCape, scale, isCustomCape)
if err != nil {
return []byte{}, err
}
buf := new(bytes.Buffer)
err = png.Encode(buf, scaledCape)
if err != nil {
return []byte{}, err
}
return buf.Bytes(), nil
}