Pinch: the image now follows the hand (midpoint drift) and zooms
ABOUT the midpoint — the image point under the fingers stays put
while the scale changes. Per-frame delta math, clamped as before
(fit min, image-edge pan limits).
Live watching: new photos appear in the grid within ~2s of being
written. inotify does not work on Android's FUSE-backed external
storage, so the watcher polls a tree signature (dir mtimes only —
a few dozen stats/s) every second; on change (or a 30s safety-net
full pass) it debounces 600ms for the write burst, then runs the
incremental rescan (walk + DB diff + emit) off the main thread.
Supporting changes:
- Staged corruption: a decode failure no longer marks an id broken
immediately — 3 consecutive failures are required, and a success
clears the count. A photo still being written fails once or twice
and then decodes; genuine garbage gives up and stays gray.
- Grid rebuild preserves the viewport across a live rescan (pins to
the cell that was on top), so a new photo landing at the top does
not jump the scroll position.
Greg Pomerantz
312d87f15d