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fix(epaper): correct vertical orientation for Y-decrement transposed panels 

A panel driven with a Y-decrement entry mode through the rotation-1 transpose
(BadgeOS on the Badger 2350) rendered upside-down: its text read vertically
flipped. The transpose was calibrated against the standard Y-increment
(GxEPD2 / raw-SSD1680) path, where the source index maps to display row via
Wn-1-x; under Y-decrement the source axis ends up flipped, so map it straight
(x) to the display row for that case. Gated on the same yTopIsHigh signal
already used for the RAM read, so Y-increment panels are byte-for-byte
unchanged. Verified: the BadgeOS factory menu now renders upright ("BadgeOS"
title + app icons readable). 23 decoder/epaper tests still pass.
This commit is contained in:
David Montero Crespo 2026-08-06 04:59:14 +02:00
parent 6442217893
commit bd063bfef8
1 changed files with 12 additions and 1 deletions
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13
frontend/src/simulation/displays/SSD168xDecoder.ts
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@ -344,12 +344,23 @@ export class SSD168xDecoder {
// Transposed (rotation 1): native actual width = H. Inverse of
// Adafruit_GFX rotation 1: native(x_raw,y_raw) -> display(xd=y_raw,
// yd=Wn-1-x_raw), Wn = true native width = H.
//
// Under a Y-decrement entry mode (BadgeOS) the source axis ends up
// vertically flipped in the display versus the standard Y-increment
// (GxEPD2 / raw-SSD1680) path this transpose was calibrated against, so
// the whole image renders upside-down (its text reads flipped). Map the
// source index straight to the display row for the Y-decrement case;
// Y-increment panels keep the Wn-1-x mapping and are byte-for-byte
// unchanged.
const out = new Uint8Array(W * H).fill(fill);
const Wn = H;
for (let ny = 0; ny < nh; ny++) {
if (ny >= W) break;
const s = ny * nw;
for (let x = 0; x < Wn; x++) out[(Wn - 1 - x) * W + ny] = src[s + x];
for (let x = 0; x < Wn; x++) {
const dispRow = yTopIsHigh ? x : Wn - 1 - x;
out[dispRow * W + ny] = src[s + x];
}
}
return out;
}