AffineUI

The first public release of AffineUI. Alpha — features, APIs, and the set of
supported platforms are all still in flux — but verified on Linux (Ubuntu,
x86-64), macOS (Apple Silicon), and Windows (x86-64): the full suite (600+
tests) passes on each, and every demo in the repo runs on all three.

Highlights

IME and international text. Composition (preedit) input now works end to end
on all three desktop platforms: Win32 via IMM32, Linux/X11 via XIM with
on-the-spot inline preedit, and macOS via NSTextInputClient. (#39, #50, #53,
#57, #74) CJK renders properly too — lazy per-glyph font fallback (no more tofu),
kinsoku line breaking, and /utf-8 on MSVC, which was silently corrupting CJK
string literals through the ANSI codepage. (#51) The preedit underline is
Japanese/Chinese convention and is correctly suppressed for Korean, where hangul
assembles jamo-in-place with no clause structure. (#75)

Native text editing and input interception. Selection, word-wise motion,
clipboard, and undo across text controls, with the input pipeline reworked to
route native events correctly. (#57)

Virtual lists and trees. Recycling providers, handle-keyed tree state that
survives expand/collapse renumbering, and full bindings — 200k-row lists scroll
without allocating. (#48)

3D viewport and DENDER. A small 3D engine, a reusable DCC viewport with an
orbit camera and gizmos, and the DENDER sample built on the editor core. (#45)

PhotoEdit on a real raster core. The photo editor now runs on a genuine C++
raster engine (brush, clone, dodge/burn, selection, gradients, blend modes,
filters) rather than a mock. (#38)

Compile-time Decius bundle. The Decius CSS framework, UI fonts, and icon font
are embedded in the library, so Theme::Decius renders fully styled with zero
on-disk assets and zero configuration. (#26, #27)

affinetools devtools. Elements / Sources / Memory panels over a
separate-process protocol, with a working hotkey and launcher.

Bug fixes

• Out-of-bounds read in the IME caret path. snap_utf8_boundary clamped an
  offset with std::min(pos, size()) and then indexed it — but size() is a
  valid offset, not a valid index. It fired on essentially every IME keystroke
  (a composition cursor of -1 means "caret at end of preedit", which resolves
  to exactly text.size()). Silent UB in release builds; a 1-byte overread that
  could mis-position the caret. (#81)
• The published Rust crate could not build. build.rs invoked cmake, which
  generated a header into the source tree — something cargo forbids ("Source
  directory was modified by build.rs"). --no-verify hid it from CI, but every
  consumer's build would have hit it. The generated header now goes to the build
  directory. (#81)
• The two-file SDK didn't compile under gcc. 500+ errors, invisible because
  CI only ever compiled the amalgamation on clang. Three distinct defects: C99
  designated initializers in Lexbor (legal in C, not in C++), an extern "C"
  wrapper that dragged sokol's C++ reference overloads into C linkage, and X11's
  None macro poisoning the single translation unit. (#52)
• Multi-layer CSS backgrounds. Only the bottom background layer could carry
  more than two gradient stops, so a stacked value like .dcs-hw--lacquer
  (a 6-stop specular over a base ramp) painted a blown-out 2-stop white wash —
  or, for a three-layer value, dropped both upper layers and rendered flat. Every
  layer now carries a full N-stop list, painted back-to-front. (#52)
• N-stop radial gradients rendered as nothing. The bottom-layer paint path
  forwarded stop1_pos_pct — a two-stop-only concept that scales the radius —
  into an N-stop ramp, where stop 1 is merely the second stop. The radius
  collapsed to 4% of its size. (#73)
• Win32 IME caret landed to the left of the glyph being typed.
  GCS_CURSORPOS returns the caret in the low 16 bits, and a 0 cursor on a
  non-empty preedit means "no caret placed inside the composition", not "caret at
  zero". (#73)
• DENDER crashed when changing an object's dimensions. The 3D renderer cached
  a raw Painter* across frames, but the painter is a per-frame stack object.
  Regenerating the mesh changed the render target, which forced the stale pointer
  to be dereferenced — into a dead stack frame. (#83)
• Background images were inherited by descendants, making every child restart
  its parent's gradient inside its own box. (#52)
• macOS: multi-second drag lag, from queued native input being ordered behind
  a coalesced frame marker. (#56) 3D demos segfaulted on launch. (#54)
  Cmd-Q didn't work. (#72)
• GL backend: wrong composite format and V orientation. (#32)
• Memory and DOM resource lifecycle hazards; UI object lifetimes and image
  ownership hardened. (#44, #86)
• Dock/paint: column widths, window-edge span and precedence, textarea clip,
  atomic float painting. (#35, #37)

Changes

• ./build.ps1 run <name> / ./build.sh run <name> now work for every
  sample, including the Python ones (PhotoEdit, the component gallery). The
  example list is generated from CMake at configure time rather than hand-
  maintained, so it can't drift. (#52, #58)
• CI now gates the surfaces that had no coverage at all: the language
  bindings (including affineui_c, the C ABI both Rust and C# link against,
  which no job had ever built), every example, and the amalgamation under gcc.
  (#52)
• examples/19_ime_lab — a harness for verifying IME against a real platform
  IME, showing the engine's live composition state (preedit, clause range, caret
  rect) next to the text fields. (#52)
• Unfinished demos retired. (#58)
• Docs: USERS_GUIDE.md and REFERENCE.md, organized by renderer/framework
  layer. (#34) Translated READMEs. Every package README now states the alpha
  status and the verified platforms plainly. (#94)
• Tag-driven release pipeline for crates.io, NuGet, PyPI, and GitHub Releases.
• The project moved to the affineui org (github.com/affineui/affineui),
  along with decius-css and the lexbor / nanovg / yoga forks. (#91)
• Discussion, questions, and show-and-tell: r/affineui. (#93)