ImageCircleTransformation

CircleTransformation.java

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Paint;

import com.bumptech.glide.load.engine.bitmap_recycle.BitmapPool;
import com.bumptech.glide.load.resource.bitmap.BitmapTransformation;

public class CircleTransform extends BitmapTransformation {

   public CircleTransform(Context context) {
       super(context);
   }

   @Override protected Bitmap transform(BitmapPool pool, Bitmap toTransform,
                                        int outWidth, int outHeight) {
       return circleCrop(pool, toTransform);
   }

   private static Bitmap circleCrop(BitmapPool pool, Bitmap source) {
       if (source == null) return null;

       int size = Math.min(source.getWidth(), source.getHeight());
       int x = (source.getWidth() - size) / 2;
       int y = (source.getHeight() - size) / 2;

       Bitmap squared = Bitmap.createBitmap(source, x, y, size, size);

       Bitmap result = pool.get(size, size, Bitmap.Config.ARGB_8888);
       if (result == null) {
           result = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888);
       }

       Canvas canvas = new Canvas(result);
       Paint paint = new Paint();
       paint.setShader(new BitmapShader(squared, BitmapShader.TileMode.CLAMP,
               BitmapShader.TileMode.CLAMP));
       paint.setAntiAlias(true);
       float r = size / 2f;
       canvas.drawCircle(r, r, r, paint);
       return result;
   }

   @Override public String getId() {
       return getClass().getName();
   }
}