DarkRoom/third_party

Patched upstream crates

Each directory here is a crate exactly as crates.io publishes it, at the version Cargo.lock resolves, with a local patch on top. The root Cargo.toml routes the dependency here through [patch.crates-io]; the directory is excluded from the workspace, so cargo test --workspace, clippy and fmt leave it alone.

The first commit that adds a directory is the pristine copy (from ~/.cargo/registry/src/*/<crate>-<version>, minus .cargo-ok and the crate's own Cargo.lock). Every later commit touching it is ours, so git log -p -- third_party/<dir> is the patch and nothing else.

Carrying a patch forward

When Slint or wgpu is bumped, the version here stops matching and cargo warns that the patch is unused — the build then silently goes back to the unpatched crate. So a bump is:

1. Copy the new version in beside the old one, as its own commit.
2. Re-apply the diff from git log -p on the old directory.
3. Point [patch.crates-io] at the new directory and delete the old one.
4. Re-check on the device (below) — both patches are behaviour that only a rotated Android display exercises.

Drop a patch entirely once upstream has the fix; each section says what upstream change would make it unnecessary.

wgpu-hal 29.0.4 — Vulkan pre-rotation on Android

Upstream creates every Vulkan swapchain with preTransform = IDENTITY (src/vulkan/swapchain/native.rs, gfx-rs/wgpu#3345). On Android, a window whose orientation differs from the panel's is then rotated by the compositor on the GPU (composition=CLIENT), and on this tablet in portrait those frames tear.

The patch adds two methods to wgpu_hal::vulkan::Surface:

• current_transform(&Adapter) — the surface's currentTransform.
• set_pre_transform(transform) — the preTransform for the next swapchain. Opt-in: nothing calls it but the Skia patch below, and the default is still IDENTITY, so desktop and every other caller behave exactly as upstream.

Setting it is a promise that the caller draws rotated into a swapchain sized in the panel's orientation; wgpu itself rotates nothing.

Unnecessary once wgpu exposes pre-rotation itself (#3345).

i-slint-renderer-skia 1.17.1 — rotate the canvas to match

wgpu_29_surface.rs keeps the promise the wgpu-hal patch lets it make. On Android it reads the surface's transform whenever it configures, sizes the swapchain in the panel's orientation (width and height swapped for a quarter turn), calls set_pre_transform, and concatenates the matching rotation onto the Skia canvas before Slint draws — so the whole UI, including an imported wgpu::Texture, is drawn pre-rotated. It checks the transform before every frame too, because a half turn (landscape to reverse landscape) changes it without resizing the window. Touch input is untouched: only drawing is rotated.

itemrenderer.rs widens the pixel-alignment check from "pure translation" to "any right-angle rotation or flip without scaling". Without that, a rotated canvas silently loses pixel snapping everywhere.

Off Android every path is upstream's: the rotation is always None.

Unnecessary once Slint's Skia wgpu surface pre-rotates on its own — worth offering upstream, since the linuxkms backend already renders through the same rotate-and-translate in render_to_canvas.