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main.go
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package main
import (
"flag"
"image"
"image/draw"
"image/png"
"math/rand"
"os"
"path/filepath"
"time"
"cloud.google.com/go/vision/apiv1"
"github.com/disintegration/imaging"
"github.com/paulvasilenko/go-transcolor"
"golang.org/x/net/context"
)
var facesDir = flag.String("faces", "faces", "The directory to search for faces.")
func main() {
rand.Seed(time.Now().UTC().UnixNano())
flag.Parse()
var err error
var facesPath string
if *facesDir != "" {
facesPath, err = filepath.Abs(*facesDir)
if err != nil {
panic(err)
}
}
chrisFaces := FaceList{}
err = chrisFaces.Load(facesPath)
if err != nil {
panic(err)
}
if len(chrisFaces) == 0 {
panic("no faces found")
}
file := flag.Arg(0)
baseImage := loadImage(file)
ctx := context.Background()
client, err := vision.NewImageAnnotatorClient(ctx)
if err != nil {
panic(err)
}
f, err := os.Open(file)
if err != nil {
panic(err)
}
defer f.Close()
imageToDetect, err := vision.NewImageFromReader(f)
faces, err := client.DetectFaces(ctx, imageToDetect, nil, 100)
if err != nil {
panic(err)
}
bounds := baseImage.Bounds()
canvas := canvasFromImage(baseImage)
numberList := rand.Perm(len(chrisFaces))
for i, face := range faces {
rect := image.Rect(
int(face.BoundingPoly.Vertices[0].X),
int(face.BoundingPoly.Vertices[0].Y),
int(face.BoundingPoly.Vertices[2].X),
int(face.BoundingPoly.Vertices[2].Y))
newFace := chrisFaces[numberList[i%len(chrisFaces)]]
if newFace == nil {
panic("nil face")
}
draw.Draw(
canvas,
rect,
transcolor.Transfer(
canvasFromImage(baseImage).SubImage(rect),
imaging.Resize(
newFace, rect.Dx(), rect.Dy(), imaging.Lanczos,
),
),
bounds.Min,
draw.Over,
)
}
if len(faces) == 0 {
face := imaging.Resize(
chrisFaces[0],
bounds.Dx()/3,
0,
imaging.Lanczos,
)
faceBounds := face.Bounds()
draw.Draw(
canvas,
bounds,
face,
bounds.Min.Add(image.Pt(-bounds.Max.X/2+faceBounds.Max.X/2, -bounds.Max.Y+int(float64(faceBounds.Max.Y)/1.9))),
draw.Over,
)
}
png.Encode(os.Stdout, canvas)
}