POWER-FINAL-23 — Reborn Cover Flow and Genres

Status: INSTALLED; Cover Flow looks right but ran at ≈10 fps → 24 (2026-10-13). Package out/y2linux-platform-v1-power-final-candidate-23/ (fallback = 22), receipts out/deep-sleep-final/build23-receipts/. BOOTIMG 9ea7a94377b0f63977a8732569c357a837112b69f321f8f501424b2a72a475cb, Y2ROOT 8fff0f839836ca5583ac9bdd76eb71d82840a45a0df347ecf6e75468fae0d297. Identity: build Y2LINUX-PLATFORM-V1-POWER-FINAL-23, kernel 6.18.56-y2linux-platform-v1-power-final-23, root 2026.08-platform-v1.53, release 1.0.0-platform-v1-power-final-candidate.23; Linux 7f5445d, Reborn 83c9127 (new). The platform is 22 unchanged. Flash BOOTIMG + ANDROID only with MT6582_preserve_data_scatter.txt, Download Only. Scope audit: "POWER-FINAL-23 Reborn Cover Flow and Genres scope audit" in the roadmap gap audit.

Owner request and decisions

Cover Flow for albums, highly optimised (smooth scrolling, an animation opening the album), and Genre in the main list. Decisions: Albums opens Cover Flow, Settings → Display → Album view switches back to the Grid; Genre → Albums (headed by All Songs) → Songs.

What changes (Reborn 58670c8, 116f673, 83c9127)

• Genres: the library stores the genre tag (additive column; METADATA_REVISION 3, so an existing library

  re-reads every song's tags once during the next scan, no rebuild). Home and Music get Genres (the home menu now has seven rows; spacing follows the count). A genre opens its albums in the chosen album view, headed by **All Songs; untagged songs are listed as No Genre**.

• Cover Flow: each cover is a square turned about its vertical axis and pushed back, projected (focal length

  300 px) into a perspective-correct quadrilateral, with a mirrored reflection fading into the background; title, artist, length and "n of N" below. The row glides to the focus with time-based easing (≈0.4 s to rest, smooth at any frame rate and under fast wheel spins). Select flies the centre cover into the album page while its list rises in (300 ms); Back flies it home. Once the row rests, the centre cover is decoded at 160 px by the artwork worker (the side covers use the 96-px thumbnails).

• Renderer: Quad.warp (four corners, per-corner tints), sampled with texture2DProj so the projective divide

  happens in the texture unit at full precision. A first version divided in the fragment shader; on the host it shifted glyph sampling (Mali-400 fragment shaders are fp16), caught by the GLES comparison and fixed.

• Setting: Settings → Display → Album view (Cover Flow / Grid).

Tests

Reborn: rustfmt, clippy -D warnings, 370 workspace tests (new: genre storage and pre-genre migration, Genres navigation, seven-row home fit, Cover Flow geometry and easing, view switch, flight and full-resolution cover request). Host GLES: ordinary screens render bit-identically to 22's renderer; all 77 preview screens match the reference rasteriser. Y2Linux: container suite 693, exit 0; package validation, ELF, installed ARM, privacy, inventory PASS.

What to check on the device

1. After the first boot the library re-reads tags once (a scan); then Home shows Genres with a count.
2. Albums: Cover Flow; spin the wheel slowly and fast — the glide should stay smooth; the centre cover sharpens a

   moment after stopping. Select → the cover flies into the album page; Back → it flies home.

3. Genres → a genre → All Songs and its albums; No Genre lists untagged songs.
4. Settings → Display → Album view → Grid restores the old grid.
5. Frame times: graphics_frame_time_ms in Reborn's metrics while scrolling (target ≤ 16.7 ms).