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feat(display): compensate for the panel's scan order while scrolling (#634)

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A 1:N-scan HUB75 panel lights the two rows either side of its middle at opposite ends of each refresh, so a scroll at one pixel per refresh shows a 1px step across the middle of every panel. While something scrolls at one frame per refresh, DisplayManager now shows the half whose seam row lights first one refresh behind the other (src/scan_order.py), which lines the two up again. Only for layouts whose row order is known; display.scan_order_compensation "off" disables it. Confirmed on hdpi before and after.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Chuck
2026-09-24 19:47:44 -04:00
committed by GitHub
co-authored by Claude Opus 5.5
parent 8ad9d191a7
commit 865d62f67b
6 changed files with 360 additions and 8 deletions
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docs/CONFIG_REFERENCE.md
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@@ -105,6 +105,7 @@ logical image to multiple chained physical panels.
| `display_durations` | object, `{}` | Per-plugin display duration in seconds, keyed by plugin id (e.g. `"clock": 15`) | `DisplayController._get_display_duration()` (`src/display_controller.py`) |
| `plugin_rotation_order` | array, `[]` | Explicit rotation order of plugin ids; empty = all enabled plugins in discovery order | `DisplayController._apply_plugin_rotation_order()` (`src/display_controller.py`) |
| `use_short_date_format` | bool, `true` | Compact date rendering in sports scoreboards | Nothing since `src/base_classes` was removed; scoreboards read `display.use_short_date_format` from their own plugin config |
| `scan_order_compensation` | string, `"auto"` | `"auto"` shows one half of each panel a refresh behind while something scrolls at one frame per refresh, which removes the 1px step a 1:N-scan panel shows across its middle; `"off"` disables it. Applies only to layouts whose row order is known: plain or parallel chains, 0 or 180 degree orientation, `multiplexing` 0, `scan_mode` 0, and not in the emulator | `DisplayManager._setup_scan_order_compensation()` (`src/display_manager.py`, `src/scan_order.py`) |
| `dynamic_duration.max_duration_seconds` | int, optional | Cap for plugins that request dynamic display time | `DisplayController._get_global_dynamic_cap()` (`src/display_controller.py`) |
## `display.vegas_scroll` — continuous scroll mode