[Unreleased]

Added

Opt-in DMA for ESP32 hardware SPI (CONFIG_ESP32_SPI_DMA_ENABLE, off by default): routes the ESP32 SPI transport through a DMA channel with a DMA-capable flush buffer (size via CONFIG_ESP32_SPI_DMA_BUFFER_SIZE, default 512), so bulk pixel writes go out as large DMA transactions. Transfers stay blocking, so data/command (DC) line ordering is preserved; with the macro undefined the SPI path is byte-for-byte identical to before. Drivers are unchanged (the DMA logic lives entirely in the SPI HAL).
Per-group exact font width in fontgenerator.py (issue #139): the -g option now takes an optional 3rd argument — -g <first> <count> <width> — that forces every char in that group to an exact pixel width, keeping the glyph centered (narrow chars padded, wider chars cropped). The width is stored per char in the new-format jump table, so it is free at runtime and works with setSpacing(). Ideal for widening thin chars (space, colon, period) without expanding the whole font to a single fixed width (-fw).
Adafruit_GFX-compatible facade (src/canvas/gfx_compat.h): new header-only GfxCompat<D> adapter (plus makeGfxCompat() helper) that exposes the Adafruit_GFX drawing API on top of any lcdgfx display or canvas, with no external Adafruit_GFX library required.
- Geometry: drawPixel, drawFast{H,V}Line, drawLine, draw/fillRect, fillScreen, draw/fillCircle, draw/fillTriangle, draw/fillRoundRect, drawBitmap.
- Text: setCursor, setTextColor, setTextSize, write, print/println overloads, and Adafruit GFXfont custom-font rendering via setFont(const GFXfont*) (works on paged monochrome and colour displays; PROGMEM fonts supported).
- Monochrome 0/1 colour is mapped to lcdgfx's mask at compile time (zero runtime cost); colour values pass through unchanged.
- Docs: docs/gfx_compat.md; example: examples/direct_draw/gfx_compat.

Changed

**drawLine now coalesces bus transactions.** Instead of addressing the controller once per pixel, diagonal lines are emitted as runs of same-row / same-column spans (a single drawHLine/drawVLine per run). Near-horizontal and near-vertical lines drop from one set-window burst per pixel to a small handful, cutting bus traffic several-fold at zero RAM cost. Output is pixel-identical for all existing use; no driver or API changes.

Fixed

Steep and vertical drawLine on 1-bit (page-addressed) displays. In bufferless mode each putPixel rewrites a whole 8-pixel page byte, so a per-pixel diagonal/vertical line clobbered earlier pixels sharing a page and rendered with gaps. Routing runs through drawVLine builds the correct page bytes, so these lines are now solid. Colour displays were unaffected.

[1.3.1] - 2026-04-29

Fixed

GUI widgets
- LcdGfxMenu / LcdGfxCheckboxMenu — eliminate flicker and scroll artifacts; do not invert checkbox mark itself when row is highlighted (only label text is inverted); checkbox toggle now reflects on screen immediately without needing to move selection.
- LcdGfxSlider — page-aligned 3-fillRect rendering on SSD1306: knob band lives in full pages strictly between the top/bottom border rows, so border lines are never disturbed and the slider does not flicker.
- LcdGfxSpinbox — central text band cleared explicitly each frame so value updates do not leave artifacts; border + arrows redrawn cleanly.

[1.3.0] - 2026-04-28

Added

GUI widgets
- LcdGfxSlider — horizontal value slider with bounded range and keyboard navigation (up/down). See examples/gui/slider_demo.
- LcdGfxSpinbox — bounded integer spinbox with configurable step. See examples/gui/spinbox_demo.
- LcdGfxTextEntry — single-line text-entry widget with cursor and cycleable charset (ASCII default; UTF-8 charset works with a secondary font). See examples/gui/text_entry_demo.
Touch input
- LcdGfxXpt2046 — templated SPI driver for XPT2046 resistive touch controllers. Median-of-3 sampling, pressure detection, swappable SPI transport. See examples/touch_demo.
- TouchCalibration — per-axis affine calibration helper with swap/invert and clamping.
- LcdGfxMenu::onTouch() and itemAtPoint() — touch-driving the existing menu widget without changing its key API. See examples/gui/menu_touch_demo.
Core API
- lcdgfx::color namespace — header-only, constexpr, to_rgb565 / to_rgb332 / from_rgb / gray (BT.601 weights). Bit-identical to the existing RGB_COLOR16 / RGB_COLOR8 macros.
- nano_utf8_decode() — stateless UTF-8 decoder in canvas/font_utf8.h. Rejects overlongs, surrogates and codepoints above U+10FFFF.
- ssd1306xled_font6x8_Cyrillic — proof secondary font covering U+0410..U+042F (А..Я). See examples/utf8_demo.
Build / CI
- Opt-in CXXSTD knob in Makefile (defaults to c++11).
- CI matrix now builds the library and runs the unit tests under c++11, c++14 and c++17.
Documentation
- docs/controller_matrix.md — capability matrix for every supported display controller.
- docs/migration_v1_v2.md — migration guide from the v1 API to the v2 API.

Fixed

SSD1325::fillRect 4-bit nibble-packing now respects setColor() for odd columns.
Linux sysfs GPIO fallback no longer leaks the export handle on early-return error paths.

Tests

Unit-test count: 363 → 470 (107 new tests across 7 new test files), all green under make ARCH=linux SDL_EMULATION=y check.

[1.2.0] - prior release

ILI9341 SDL emulator 90° CW rotation fix.
Comprehensive Doxygen documentation overhaul.
Checkbox menu widget and scroll indicators.
libgpiod line-ownership bug fix (issue #134).
Other fixes covering issues #28, #74, #92, #96, #98, #100, #125, #137.