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Picasso Transformation that transforms the image in a Circle

View CircleTransform.java
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package com.example.picassodemo;
 
import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Paint;
 
import com.squareup.picasso.Transformation;
 
/**
* Created by julian on 13/6/21.
*/
public class CircleTransform implements Transformation {
@Override
public Bitmap transform(Bitmap source) {
int size = Math.min(source.getWidth(), source.getHeight());
 
int x = (source.getWidth() - size) / 2;
int y = (source.getHeight() - size) / 2;
 
Bitmap squaredBitmap = Bitmap.createBitmap(source, x, y, size, size);
if (squaredBitmap != source) {
source.recycle();
}
 
Bitmap bitmap = Bitmap.createBitmap(size, size, source.getConfig());
 
Canvas canvas = new Canvas(bitmap);
Paint paint = new Paint();
BitmapShader shader = new BitmapShader(squaredBitmap, BitmapShader.TileMode.CLAMP, BitmapShader.TileMode.CLAMP);
paint.setShader(shader);
paint.setAntiAlias(true);
 
float r = size/2f;
canvas.drawCircle(r, r, r, paint);
 
squaredBitmap.recycle();
return bitmap;
}
 
@Override
public String key() {
return "circle";
}
}
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