PdfImageRenderInfoQuadPoints Property

The four corners of the rendered image as they appear after any rotation has been applied, in points and with the same origin as BoundingBox. The corners follow the original orientation of the image: TopLeft is the corner that was top-left before rotation, and so on. Use this property to draw connecting lines or annotations that follow the rotation of the image instead of an axis-aligned bounding box

public PdfQuadF QuadPoints { get; }