Xojo Drawing Model: Regions, screen coordinates

Question 1: Does Xojo have a model for arbitrary regions created by a collection of rectangles? For example, adding / subtracting rectangles with screen coordinates to build up a non-rectangular “region”, which can be filled, inverted, framed, and which a point coordinate can be tested to see if it falls inside the region bounds? (obviously, each platform has its OWN methods for this operation – my question is does Xojo’s drawing model offer any abstraction for this type of operation?)

Question 2: Last time I checked, Xojo’s text drawing model (even for drawing Retina / HDPI text) assumed 72 DPI screen coordinates, is that still correct?

Question 3: In a scrolled view / canvas, if I were drawing a line of text (NOT in a text control) that BEGAN above and off-screen, but extended down into the top of the view/canvas, can drawing be moved to a NEGATIVE position above the view/canvas, then drawn, with the position of the text drawn above the view properly clipped?