[Marc-André Moreau (mamoreau-devolutions)]

Two things the code-first API could not do, which an image editor or a capture tool needs: put pixels Rust produced on screen while getting the raw pointer stream, and show a tray icon without a view-model schema compiled into the host. Jiffshot (a screen capture tool and editor) is built entirely on these, with no AXAML or C#.

What's in it

• IAvnApplication7 (stage 34), a separately versioned capability. Published vtables are unchanged; older hosts answer E_NOINTERFACE.
• Pixel surfaces (IAvnPixelSurface, Rust-implemented IAvnPixelSurfaceHandler):
  • A host control drawing up to 8 bitmap layers that Rust fills (premultiplied RGBA or BGRA). Each layer is placed at a rectangle in DIPs or over the whole control, with an interpolation mode and opacity, over an optional background.
  • Input goes to a Rust closure: press/move (coalesced intermediate points included)/release/wheel/enter/exit/capture lost with buttons, modifiers and click count; keys; text input; size and scaling changes. A press captures the pointer until its release.
  • Rust: rustolonia::pixel_surface (PixelSurface, SurfaceInput, AppContext::create_pixel_surface), and examples/pixel_surface.rs, a small paint program.
• Tray icons built from Rust (IAvnShellTray, IAvnShellTrayHandler):
  • Stage 33's tray needs a schema compiled into the host, which a code-first app on the prebuilt host doesn't have.
  • Rust: rustolonia::ShellTray with TrayMenuItem (commands, check boxes, separators, submenus) and AppContext::create_tray. Icons are released when Run ends, like stage 33's.
• Docs: rust/COMPATIBILITY.md, rust/rustolonia/README.md.
• rust/prepare-release.ps1: skips in-repository lock files that do not use rustolonia (an app with more than one workspace).

Testing

• rustolonia-sys unit tests: 49 passed, including vtable slot counts and both Rust-implemented handlers.
• rustolonia unit tests: 63 passed; cargo check --examples clean; the module's doc example compiles.
• rustolonia-sys nativeaot_fixture: 12 passed, including the new capability against a locally published host. Bitmaps need the platform Run initializes, so before Run the fixture checks argument validation and the calls that don't render.
• In use: Jiffshot's editor canvas, selection overlay (one window per monitor), Screen Draw, recording toolbar and tray icon run on these. Its scripted UI test and a live tray-mode run (menu, switches, capture hotkey) passed on a host built from this code.

Notes for review

• A new host capability: per rust/COMPATIBILITY.md it belongs in a release that bumps all three crates. No version is bumped here. Jiffshot needs that release to build outside this repository on the prebuilt host.
• Known gaps hit while building Jiffshot, not addressed here (follow-ups): menu headers can't carry access keys (header_text wraps a TextBlock; AccessText isn't projected); file-drop events carry no position; Rust can't start a drag; no "frame rendered" notification; a window's decoration theme can't be set.

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