The centering Translate formula, (1-s)*(ART_SIZE/2), was derived assuming
it's applied in final output pixels. That held up at a moderate zoom
(1.4x) but pushed past the image's actual edge at a strong one (1.7x) --
a real, on-device black border in the bottom-right corner, confirmed with
the calibration tool (true black RGB(0,0,0) pixels, not just dark
content).
Dividing the shift by the scale factor keeps the crop inside the image's
bounds at every zoom level the app offers, verified via the calibration
tool at 1.0/1.15/1.4/1.7x and against a live station -- at the cost of
the most extreme (1.7x) setting being very slightly off-center rather
than perfectly centered, which is a trade worth making since going
outside the art's bounds is worse. Moderate and subtle remain visibly
centered.
dev/calibration.png is a synthetic grid (concentric color rings, corner
markers, a crosshair) and dev/calibration_test.star runs it through the
same zoom logic as the real _art_widget, so cropping can be checked
visually without depending on what a live station happens to be playing.
This is what was used to find and verify the centered-zoom fix.
poprhythm