chromosomix 0.4.1

What changed in chromosomix 0.4.1, released on 4 August 2026.

Changed

• A real app icon, dark, everywhere an icon appears. The mark is the thing the viewer draws — a block-diagonal contact map, three genomes on the diagonal and two long-range contacts off it — on a macOS-style plate. It replaces the flat blue square with two white blocks, and it is now one drawing rather than two: scripts/make-app-icons.py renders the browser tab favicon, the install prompt’s 192 and 512, a new apple-touch-icon.png for the iOS home screen, and the 1024 square electron-builder derives every macOS, Windows and Linux icon from. The favicon is written into index.html by the same script, from the same constants, so the tab icon and the dock icon cannot drift apart the way the two hand-kept drawings could.

  The dark variant is the one that ships at every size. The light one is still drawn, into an ignored out/, so the mark exists in both values — but nothing in the build reads it.

  The plate’s edge is now a ring band — the difference of two squircles, filled with a vertical gradient — rather than a stroked outline clipped back to the silhouette. The old way drew the border at full strength and then threw most of it away in the compositing, against a mask whose own edge is antialiased, which is why the light plate had a border only in the sense that something was there. Each variant now names a rim and a bevel: the light plate gets a warm dark hairline with a white highlight inside it, the dark plate the white hairline it already had, crisper.

• The Linux window carries the icon too. electron-builder installs the launcher entry and the hicolor ladder, but the window itself is drawn from what the process declares, so the taskbar and the alt-tab switcher showed the default Electron icon. build/icon.png now ships beside the asar as an extra resource and BrowserWindow names it. No change on macOS or Windows, where the bundle and the .exe already answer that question.

Removed

• scripts/make-app-icons.mjs, superseded by scripts/make-app-icons.py. It wrote the same three files, so leaving it would have meant one npm run icons:app away from silently reinstating the old mark. icons:app now runs the Python script and takes METACOOLER_PYTHON the way fixtures does; it needs pillow and numpy, and the icons it draws stay committed, so no clone and no CI runner has to have either.