ios – The right way to annotate rounded, aspect-fill picture in PDFView (swift PDFKit)

I’m engaged on annotate a picture to an present PDFView.
That is my present state:

And beneath is my desired state:

In a single sentence, I wish to obtain:

1. a rounded corder of my picture annotation
2. picture must also keep the unique facet ratio
   I’ve tried and searched many sources however none of them works.

Under is my present code:

class PDFImageAnnotation: PDFAnnotation {

var picture: UIImage?

comfort init(_ picture: UIImage?, bounds: CGRect, properties: [AnyHashable : Any]?) {
    self.init(bounds: bounds, forType: PDFAnnotationSubtype.stamp, withProperties: properties)
    self.picture = picture
}

override func draw(with field: PDFDisplayBox, in context: CGContext) {
    tremendous.draw(with: field, in: context)

    // Drawing the picture inside the annotation's bounds.
    guard let cgImage = picture?.cgImage else { return }
    context.draw(cgImage, in: bounds)
}

}

Implementation in ViewDidLoad:

if let picture = pet.image?.getImage() {
        let imageAnnotation = PDFImageAnnotation(picture, bounds: CGRect(x: 80, y: 1100, width: 300, peak: 300), properties: nil)
        pdfView.currentPage?.addAnnotation(imageAnnotation)
    }