ConstReadonlyFillMax: "fill-max"ReadonlyFillMin: "fill-min"Canvas is resized to fit minimum design resolution; content is scaled to design aspect ratio

ReadonlyFit: "fit"Letterboxed; the DESIGN RESOLUTION is kept and the whole frame is scaled to the largest factor that fits, leaving the rest as margin.
The one mode where the game always sees exactly the world it was
authored for: every other mode resizes the renderer, so the viewport
grows or shrinks with the window. It is also the only mode
scaleRounding applies to, since it is the only one with a fixed
factor to round.

ReadonlyFlex: "flex"Canvas width & height is resized to fit; content is scaled to design aspect ratio

ReadonlyFlexHeight: "flex-height"Canvas height is resized to fit; content is scaled to design aspect ratio

ReadonlyFlexWidth: "flex-width"Canvas width is resized to fit; content is scaled to design aspect ratio

ReadonlyManual: "manual"Manual; no automatic scaling is performed. The canvas keeps the size it was given and nothing is measured.
No illustration: there is nothing to show. The one that used to sit
here was Fit's.
ReadonlyStretch: "stretch"Canvas is resized to fit; content is scaled to screen aspect ratio

Canvas is resized to fit maximum design resolution; content is scaled to design aspect ratio