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fix(epaper): persist the window union across refreshes (fix partial-refresh tears) 

e-paper RAM persists between refreshes, but the decoder reset the accumulated
window union on every 0x20 MASTER_ACTIVATION. A PARTIAL refresh (BadgeOS redraws
only a strip when you navigate) then set a small window, so composeFrame emitted
just that strip, placed top-left with the rest black — reading as a 90°-rotated
screen with a black band down the side. Keep the union (and the greyscale flag)
across refreshes so it stays at the full-panel extent set by the first full
refresh; every frame now composes the whole persistent RAM and partial updates
land in place. Cleared only by a real RST (0x12). Paged full refreshes (GxEPD2)
re-cover the panel each frame so they are unchanged; the BadgeOS menu render is
byte-identical and all 23 decoder/epaper tests pass.
This commit is contained in:
David Montero Crespo 2026-08-06 16:53:00 +02:00
parent bd063bfef8
commit 66268507c8
1 changed files with 10 additions and 6 deletions
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16
frontend/src/simulation/displays/SSD168xDecoder.ts
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@ -396,12 +396,16 @@ export class SSD168xDecoder {
this.refreshedCount += 1;
const frame = this.composeFrame();
this.onFlush?.(frame);
// Start a fresh window union for the next frame's pages, and a fresh
// red-plane-written flag so a subsequent 1-bit-only refresh (0x24 with
// no 0x26) is not mis-detected as greyscale.
this.winXSet = false;
this.winYSet = false;
this.redWritten = false;
// Do NOT reset the window union or the greyscale flag here. e-paper RAM
// persists between refreshes: a PARTIAL refresh (BadgeOS redraws only a
// strip on navigation) sets a small window, and resetting the union made
// composeFrame emit just that strip — placed top-left with the rest
// black, which reads as a 90°-rotated screen with a black band. Keeping
// the union means it stays at the full-panel extent established by the
// first full refresh, so every frame composes the whole persistent RAM
// and partial updates land in place. Paged full refreshes (GxEPD2) still
// re-cover the full panel each frame, so their union is unchanged. Both
// are cleared only by a real RST (0x12 -> reset()).
return;
}
// WRITE_BLACK/RED are recognized no-ops here; handleData() routes their