Picasso transformation that rounds up top-left and top-right corners. Rest of the image remains the same

TopRoundedCornersTransformation.java

import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffColorFilter;
import android.os.Build;

public class TopRoundedTransformation implements com.squareup.picasso.Transformation {

    @Override
    public Bitmap transform(final Bitmap source) {
        int width = source.getWidth();
        int height = source.getHeight();

        int x = 0;
        int y = 0;

        Bitmap squaredBitmap = Bitmap.createBitmap(source, x, y, width, height);
        if (squaredBitmap != source) {
            source.recycle();
        }

        Bitmap bitmap = Bitmap.createBitmap(width, height, 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);
        paint.setColorFilter(new PorterDuffColorFilter(Color.WHITE, PorterDuff.Mode.DST_OVER));

        float r = 16f;

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            canvas.drawRoundRect((float) x, (float) y, (float) width, (float) height, r, r, paint);
            canvas.drawRect((float) x, r, (float) width, (float) height, paint);
        } else {
            canvas.drawRect(0f, r, width, height - r, paint);
            canvas.drawRect(r, 0f, width - r, height, paint);
            canvas.drawCircle(r, r, r, paint); // Upper-left
            canvas.drawCircle(width - r, r, r, paint); // Upper-right

            canvas.drawRect(0, height - r, r, height, paint); // Bottom-left
            canvas.drawRect(width - r, height - r, width, height, paint); // Bottom-right
        }

        squaredBitmap.recycle();
        return bitmap;
    }

    @Override
    public String key() {
        return "toprounded";
    }
}