Jakub d1a88c8277 fix(screenshot): send GxEPD2 rotation in header; full rot 0-3 decode in Python ...

Firmware (7-byte header):
  Byte 7 = display->screenshotRotation() — GxEPD2/GFX rotation value (0-3).
  DisplayDriver::screenshotRotation() defaults to 0 (OLED).
  GxEPDDisplay::screenshotRotation() returns display.getRotation(), the
  live GxEPD2 value (reflects runtime setDisplayRotation() calls, not just
  the compile-time DISPLAY_ROTATION macro).

Python decoder:
  - Parse 7-byte header; pass rotation to eink_buffer_to_image().
  - Implement all four GxEPD2 drawPixel coordinate transforms:
      rot 0: phys_x=lx,            phys_y=ly
      rot 1: phys_x=vis_w-1-ly,    phys_y=lx
      rot 2: phys_x=vis_w-1-lx,    phys_y=vis_h-1-ly  (180° flip)
      rot 3: phys_x=ly,            phys_y=vis_h-1-lx
  - vis_w/vis_h derived from log dimensions + rotation parity (no constants).
  - Print rot= in the status line so the user sees which rotation was used.

This fixes the 180° rotated image seen with rotation=2 (portrait inverted)
without hardcoding a flip — correct for any rotation value.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

2026-05-28 08:10:16 +02:00

..

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fix(screenshot): send GxEPD2 rotation in header; full rot 0-3 decode in Python

2026-05-28 08:10:16 +02:00

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