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Implement "Flip screen" setting for E-Ink displays #3871

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May 13, 2024
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Implement "Flip screen" setting for E-Ink displays #3871

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9 changes: 8 additions & 1 deletion src/graphics/EInkDisplay2.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -62,12 +62,19 @@ bool EInkDisplay::forceDisplay(uint32_t msecLimit)
return false;

// FIXME - only draw bits have changed (use backbuf similar to the other displays)
const bool flipped = config.display.flip_screen;
for (uint32_t y = 0; y < displayHeight; y++) {
for (uint32_t x = 0; x < displayWidth; x++) {
// get src pixel in the page based ordering the OLED lib uses FIXME, super inefficient
auto b = buffer[x + (y / 8) * displayWidth];
auto isset = b & (1 << (y & 7));
adafruitDisplay->drawPixel(x, y, isset ? GxEPD_BLACK : GxEPD_WHITE);

// Handle flip here, rather than with setRotation(),
// Avoids issues when display width is not a multiple of 8
if (flipped)
adafruitDisplay->drawPixel((displayWidth - 1) - x, (displayHeight - 1) - y, isset ? GxEPD_BLACK : GxEPD_WHITE);
else
adafruitDisplay->drawPixel(x, y, isset ? GxEPD_BLACK : GxEPD_WHITE);
}
}

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