pub fn pasteboard_region(
slide_px: (u32, u32),
scale: f64,
extent: Rect,
visible: Region,
) -> RegionExpand description
The pixels the editor renders: the slide (slide_px, its size in pixels at scale pixels per
point) plus the part of extent (slide space, from slide_extent or what a render drew) that
falls within visible, the canvas’s area relative to the slide’s top-left corner. The visible
area is rounded out to whole TILEs.