SH1106: Cyrillic/UTF-8 support via U8g2_for_Adafruit_GFX overlay - #3222
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strasharo wants to merge 1 commit into
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SH1106: Cyrillic/UTF-8 support via U8g2_for_Adafruit_GFX overlay#3222strasharo wants to merge 1 commit into
strasharo wants to merge 1 commit into
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Renders non-ASCII text (Cyrillic etc) using U8g2_for_Adafruit_GFX layered on top of the existing Adafruit_SH110X/GFX driver, gated behind a new DISPLAY_UTF8_FONTS build flag so it's opt-in per board. ASCII text still goes through the fast native Adafruit path. Also adds word-wrap and scrolling for long messages (with manual joystick up/down control on the Wio Tracker L1), and fixes a UTF-8-safe truncation bug in drawTextEllipsized(). Enabled on wio-tracker-l1 and lilygo_tbeam_supreme_SX1262 for now; other SH1106 boards are untouched.
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Adds Cyrillic support for SH1106 displays (Wio Tracker L1, T-Beam Supreme for now), same technique ANTodorov used on their fork (display-utf8-support) for GxEPD/SSD1306 - keeps the stock Adafruit_SH110X/GFX driver untouched and layers U8g2_for_Adafruit_GFX on top just for non-ASCII text. ASCII still goes through the normal fast path.
Gated behind a
DISPLAY_UTF8_FONTSbuild flag so it's opt-in, nothing changes for boards that don't set it.Also threw in word-wrap + scrolling for long messages since without it a long Cyrillic message would just run off the bottom of the screen invisibly (the exact bug I ran into while testing this). Wio Tracker L1 gets manual scroll via the joystick up/down buttons too, since those were wired up but unused before.
Tested on real hardware - L1 Pro and T-Beam Supreme, both working (icons intact, wrap/scroll working, Cyrillic renders correctly).
I'd previously opened #3175 which did this by swapping the whole display backend to native U8g2, but that touched every board sharing SH1106Display and caused an icon-rendering regression from a bitmap byte-order mismatch. This is a much smaller, safer diff - closed that one and did this instead.