A container that probes a child's size was still doing it with a real
draw, so `Painter::measure` existed and almost nothing used it. Tracing
every draw of one streamed frame: 1,083 `Widget::draw` calls over 113
distinct widgets, the worst drawn 11 times at nesting depth 7-8, every
one of them mode `Draw` and none of them dirty. The cache was working --
each of the 11 was offered a genuinely different region, alternating
between an oversized probe box and a real one.
ScrollArea::draw was one of the two sources. It drew its whole content
at a box built from a stale hint, read the length back, corrected the
scroll position, and drew the content again where it belonged. The first
of those is now a measurement.
The other half is the measure fast path. A widget's reported size is a
function of its own state and the size it was offered, not of where it
was offered -- so an undirtied widget already drawn at a region of this
size has already answered, and `active.size` is the answer. This is the
same assumption `mov` makes one branch further down (same offered size,
therefore identical output, therefore a translation); it is only stated
as a size here rather than acted on as a move. Without it a measurement
costs a full recursive walk, which is what made the nesting compound.
A measurement now also peeks at the redraw mark instead of consuming it
-- it is not the redraw the mark asked for, and swallowing it would
leave the widget stale until something marked it again.
453 draws from 1,083, and the streamed frame is p50 1.18ms (from 1.22ms,
and 2.20ms before this run of work). The headless phone render is
byte-identical to the previous commit's on the real GPU.
What is deliberately NOT here: the same change to `Span::draw`'s phase 1,
which is the remaining 2x and which moves the layout by a few pixels.
The layout stays intact -- it is a position difference, not a broken
frame -- but which of the two is correct was not established, and the
suspicion (that phase 2 now takes `mov`, and `mov` accumulates deltas
where a redraw recomputes) points at a bug in `mov` rather than in
`Span`. Written up in docs/IRIS_TODO.md with Iris's target shape for
`Span`: no probe phase at all for `abs` children, and a `rest` child
forcing a reposition pass rather than a redraw.
Iris: "the organization of the rust rewrite is a mess right now... there
shouldn't be anything related to the app inside of iris. Iris is supposed
to be the UI framework alone." And, on the crate count: "I'm confused why
the app only code needs more than one crate though."
Nine cargo workspaces become three, and the port's project code -- which
sat in five places, four of them inside the framework -- becomes one crate,
`ai-app`, in `app-rust/`:
client-core -> app-rust/src/client
iris/transcript-ui -> app-rust/src/ui
iris/transcript-fixture -> app-rust/src/ui/fixture.rs + tests/ + touch/
iris/desktop-app -> app-rust/src/desktop + src/bin_desktop.rs
iris/android-app -> app-rust/src/android + android-project/
android-shell -> app-rust/src/shell
iris/ keeps core, macro, the iris crate, tabs-ui and rig-input, and now
mentions no session, transcript, setup or server anywhere.
Only two of the old splits had a reason that survived reading. event-model
stays a crate at the repo root because server/ depends on it too, so a
crate is what makes the backend and the app agree by construction. The two
Android .so names looked like a hard constraint -- a package produces one
library artifact -- until P2 turned out to already plan merging those two
Android apps into one; both faces now come out of libai_app.so, picked
apart by features so `--no-default-features --features shell` keeps wgpu,
parley and iris out of the Compose app's APK. docs/RUST.md's "One app
crate" has the rest, including what each remaining feature is for.
DECISIONS.md and SUBAGENTS.md move into docs/ with everything else.
Verified: ./run-tests.sh and `cd iris && cargo test` green, clippy and fmt
clean in all five workspaces, `cargo ndk -t x86_64` links libai_app.so,
build-apk.sh produces an APK that installs and launches on this checkout's
emulator (Gl ... virgl, as expected), and the phone-sized headless
screenshot renders the transcript unchanged.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
iris
