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fix(display): undefined-glyph box overlapped the line above on OLED

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drawLemonChar()'s "y" is the top of the current text row on SH1106 (real
glyphs render at y + 7 + yo + row), unlike GxEPDDisplay's version, where
y IS the baseline. The undefined-glyph fallback box copied GxEPD's
y - 7*sz formula verbatim during the font-unification pass, sending it
7px above the row's top edge -- into the previous line's space. Drawing
it at plain y (already baseline minus the font's 7px ascent) lands it in
the same relative position GxEPD's version occupies, within its own row.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
This commit is contained in:
Jakub
2026-07-17 20:53:56 +02:00
parent afdfca6f9b
commit fe1e0d29ce
1 changed files with 7 additions and 1 deletions
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8
src/helpers/ui/SH1106Display.cpp
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@@ -93,7 +93,13 @@ int16_t SH1106Display::drawLemonChar(int16_t x, int16_t y, uint32_t cp) {
// Font glyphs come from misc-fixed 6x9 (full Latin/Greek/Cyrillic, ascent 7) —
// baseline +7. The custom UI icons above keep +6, so they sit 1px higher.
if (cp < MiscFixed.first || cp > MiscFixed.last) {
if (cp >= 0x20) display.fillRect(x + sz, y - 7*sz, 4*sz, 6*sz, _color);
// y here is the top of the current text row, i.e. already baseline minus
// the font's 7px ascent (see real-glyph rendering just below: y + 7 + yo +
// row) -- unlike GxEPDDisplay's drawLemonChar, where y IS the baseline and
// the box sits at y - 7*sc for the same reason. Drawing this box at plain
// `y` (not y - 7*sz) lands it in the same ascent-top position, within its
// own row instead of bleeding into the row above.
if (cp >= 0x20) display.fillRect(x + sz, y, 4*sz, 6*sz, _color);
return x + 6 * sz;
}
const GFXglyph* g = &MiscFixedGlyphs[cp - MiscFixed.first];