如何在ImagePicker中创建圆形编辑区域而不是矩形？

public class CircleCropTransformation 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, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
        paint.setShader(shader);
        paint.setAntiAlias(true);
        
        float radius = size / 2f;
        canvas.drawCircle(radius, radius, radius, paint);
        
        squaredBitmap.recycle();
        return bitmap;
    }
    
    @Override
    public String key() {
        return "circle";
    }
}

ImagePicker.create(this)
    .setCropShape(CropImageView.CropShape.RECTANGLE)  // 设置为矩形裁剪
    .setCropOvalDimmedLayer(true)  // 设置裁剪时的背景为圆形
    .start();