Spec v19 §11 invariant 1 requires shell-native to compile on iOS / Android
cargo check, with the `GlContextProvider` trait (invariant 2) importable on
every non-wasm target. Previously the desktop GL stack (glutin / winit /
skia-safe) was referenced unconditionally in src/, so mobile cargo check
broke the moment the Cargo.toml target-gated those deps to macOS / Linux /
Windows.
This change cfg-gates the desktop-only modules and items so the mobile
cargo check builds only the cross-platform surface:
- src/lib.rs: gate `backend` + `canvas_view_stub` modules and their
re-exports to desktop OS targets; add `EaglProvider` / `AndroidEglProvider`
re-exports under `target_os = "ios"` / `"android"`. `GlContextProvider`,
`ProviderError`, `ProviderResult` stay always-on (per §11 invariant 2).
- src/context/mod.rs: split into a cross-platform trait surface +
per-platform provider re-exports; gate `shared` (depends on `skia_safe` +
`winit`) to desktop only.
- src/context/provider.rs: cfg-gate `GlutinProvider` struct + impls + the
`pick_display_api` helper to desktop OS only; localize `CString` /
`NonZeroU32` imports inside fn bodies; gate `from_error` to desktop to
silence dead_code on mobile (the only caller is `GlutinProvider`).
- Cargo.toml: split deps into a cross-platform `cfg(not(wasm32))` block
(jian-core + glow + raw-window-handle, all required by the trait
signature on every non-wasm target) and a desktop-only block (skia-safe,
glutin, glutin-winit, winit, scopeguard, jian-skia, jian-host-desktop).
Merges the previously duplicate desktop `[target...]` table headers that
cargo rejected.
- ci: rust-multiplatform.yml mobile-check job now runs cargo check on
shell-native too (per the comment update there).
Verification:
- cargo check -p openpencil-shell-native --target aarch64-apple-darwin: PASS
- cargo check -p openpencil-shell-native --target aarch64-apple-ios: PASS
- cargo check -p openpencil-shell-native --target aarch64-linux-android: PASS
- cargo check -p openpencil-shell-native --target wasm32-unknown-unknown:
FAILS with the spec §1.2 `compile_error!` (intended).
- cargo test -p openpencil-shell-native: 14/14 PASS.
- cargo clippy -p openpencil-shell-native --all-targets -- -D warnings: clean
on macOS, iOS, Android targets.
- cargo fmt --check: clean.
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