GUI widget polish release.

Fixed

• Slider — page-aligned 3-fillRect rendering on SSD1306; knob band confined to full pages strictly between top/bottom border rows. No flicker, borders preserved.
• Spinbox — explicit central text-band clear each frame; clean border + arrows.
• Menu / CheckboxMenu — eliminated flicker and scroll artifacts; checkbox mark itself no longer inverted on highlighted row (only label text); checkbox toggle now reflects on screen immediately.
• slider_demo — rect adjusted to {{8,31},{120,40}} (page-aligned for clean SSD1306 rendering).

All 470 unit tests pass.

What's New in v1.2.0

Bug Fixes

• Fix CS pin typo in SSD1331 SPI initialization (#92)
• Fix missing #ifdef guards causing compilation errors on some platforms (#96)
• Fix narrowing conversion warning in ST7789 init (#100)
• Fix setContrast() sending wrong command on SSD1306 (#28)
• Fix ST7789 170x320 resolution support (#137)
• Fix clearRect() not clearing last pixel row (#74)
• Fix drawHLine off-by-one error in 4/8/16-bit canvas modes
• Fix drawLine Bresenham algorithm pixel ordering
• Fix SDL emulator crash on Ctrl+C (proper signal handling & cleanup)
• Fix SH1107 emulator off-by-one in page addressing
• Fix IL9163 emulator state leak between tests
• Fix memory leak in SDL emulator cleanup
• Fix macOS compilation: add I2C_SLAVE fallback define (#98)
• Fix ILI9341 SDL emulator showing content rotated 90° CW

New Features

• Add normalMode() / invertMode() API for ST7789, IL9163/ST7735, ILI9341 (#125)
• Add SDL emulators for SSD1327, SH1106, ST7735, ST7789
• Add shared SDL emulator helpers (sdl_emulator_common.h)
• Add 55+ missing multi-byte command handlers to SDL emulators

Testing & Quality

• Expand unit test suite from 2 to 347 tests
• Achieve 86.4% line coverage / 90.6% function coverage
• Add comprehensive tests for all display controllers, canvas operations, rotation, and TFT commands
• Fix cppcheck warnings across SDL emulators

Maintenance

• Triage and close 33 open GitHub issues with detailed responses
• Update documentation and ticket comments for known limitations

Bug Fixes

• Fix CS pin initialization typo in ESP32 SPI (#92)
• Fix narrowing conversion warnings in display constructors (#100)
• Fix drawHLine off-by-one bug in 4-bit/8-bit/16-bit modes
• Fix drawLine Bresenham pixel ordering bug (display and canvas)
• Fix SDL emulator segfault on Ctrl+C
• Fix SDL emulator state leaks, memory leaks, and uninitialized reads
• Fix SH1107 emulator multiplex ratio off-by-one
• Fix IL9163 emulator state leak
• Fix cppcheck warnings (constVariable, uselessOverride)

New Features

• Add setContrast() for SSD1325, SSD1327, SSD1331, SSD1351 (#28)
• Add ST7789 170x320 resolution support (#137)
• Add clearRect() convenience method to NanoDisplayOps (#74)
• Guard SPI/I2C display classes with #ifdef macros for selective compilation (#96)

SDL Emulator Improvements

• Extract shared pixel advance helpers into sdl_emulator_common.h to reduce code duplication
• Add 55+ missing multi-byte command handlers across SSD1306, SSD1331, SSD1351, ILI9341
• Prevent argument bytes from being misinterpreted as new commands

Testing

• Expand unit test suite from 2 tests to 344 tests
• Increase code coverage from ~20% to 86.4% line / 90.6% function coverage
• Add comprehensive tests for all SDL display emulators, graphics operations, canvas, fonts, rotation, and display modes

What's Changed

• Adding a library.json file to fix platformio for ESP-IDF by @MiguelBarro in #110
• Fix integer overflow for framerates less than 4 fps by @dlitz in #114
• Raspberry Pi Pico HAL by @simon-77 in #117
• Fix convert from UTF-8 to Unicode by @cwl769 in #123
• added invertMode and normalMode by @lukkass222 in #127
• Define CONFIG_ESP32_SPI_AVAILABLE if ESP32 is defined by @reconbot in #131
• Fix esp8266_spi compilation by @jonware in #135

The changes are:

• Added RGB mode control API for ST7735
• ESP32 IDF v5 compatibility
• Fixing SPI compilation
• Added setSelection for LcdGfx menu
• Added rotate functions for 1-bit canvas

Changes:

• ESP32 compilation fix
• Canvas capabilities improvements

The changes:

• Fixed compilation for ESP32
• SSD1351 96x96 display support
• Updated putPixel for 4-bit displays
• Hot fix in SPI displays procedure initialization
• ST7789 support is added (including TTGO T-Display)

• Fixed display templates
• Added GPIO read support for Linux
• Added RGB/BGR mode support for SSD1351
• Fixed ESP32 compilation for platformio

The changes:

• Auto verification is moved to circle-ci
• Fixed a lot of cppcheck warnings
• Wio terminal support is added
• Fixed script for generating fonts
• Added print function for floating point numbers
• Added ST7735S 80x160 display support
• Added RGB/BGR modes for SSD1351 display

Updates:

• Fixed cppcheck warnings
• Added custom display support (refer to examples)
• Thinary board support
• Added simple GUI API (refer to examples)
• Added CMake support
• Fixed ESP8266 spi compilation
• Added SH1107 displays support (first version)
• Added drawCircle API for canvas