The copy was fixed at 1600px, so a hidpi screen was already stretching it at
1:1 and every wheel notch made it worse. The stage now reports the size it is
painting at — the contain-fit times the pixel ratio times the zoom — and the
app re-cuts the source copy to match, quantised and capped at 3200px, which is
the largest copy the grade can still afford. The wheel keeps its instant
transform; the sharper copy lands once the gesture stops.
3dtours
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