With Skia drawing pre-rotated on wgpu's Vulkan swapchain, Android no
longer needs to draw with Skia over OpenGL, which was the only reason
the develop view read its frame back through memory (TD-1).
So `unstable-wgpu-29` moves back to the common slint dependency. The
android-activity backend then builds `SkiaRenderer::default_wgpu_29`,
and `shared_gpu` loses its Android arm. The one wgpu device is handed to
Slint through `BackendSelector::require_wgpu_29` on both platforms.
`slint::android::init_with_event_listener` runs before `dr_ui::run`, so
the selector reaches the Android adapter before its window exists.
`renderer-femtovg-wgpu` stays desktop-only, since Android has no FemtoVG.
The two `#[cfg(target_os = "android")]` readbacks in `develop::render`
(the frame through `export_pixels` and the focus overlay through
`read_overlay`) are gone. `read_overlay` stays for the tests that check
what the overlay marks.
Built for arm64 and release-signed. Not yet run on the tablet.
FR-CULL-3's focus peaking. One compute dispatch measures local contrast
in WGSL and writes an overlay texture; on desktop it reaches Slint
through the same zero-copy wgpu import the canvas uses, so nothing
per-pixel touches the CPU on the frame path.
With peaking off the cost is zero and structurally so: focus_overlay
opens with `let settings = self.peaking?;` before the frame is touched,
and clearing drops both overlay textures, so no VRAM is held either.
NFR-P14 is met by construction rather than by measurement -- one
dispatch, no second render, no pipeline compile after session open, and
a test asserting allocations stay at 2 over eight frames. The budget
test asserts 50ms at 4K rather than a tight bound, deliberately: a tight
bound fails on a loaded machine and gets deleted, which is worse than a
loose one that still catches the regression that matters.
TD-1 is amended rather than joined by a TD-6: on Android the overlay
rides the readback that already exists there, roughly doubling that
transfer while peaking is on, and TD-1's own "Done when" removes both
because both are the same missing capability.
Verified: cargo fmt clean; clippy --workspace --all-targets -D warnings
green, which also compiles peaking.slint through dr-ui's build.rs; 11
focus GPU tests and 79 baseline dr-gpu tests pass; 511 dr-ui tests pass.
Not verified: the cfg(target_os = "android") arm, which the host-target
clippy never compiled.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
dtourolle
