test(cpu-gui-egui-test): egui/eframe offscreen render + interaction carpet - #1876
test(cpu-gui-egui-test): egui/eframe offscreen render + interaction carpet#1876Lfan-ke wants to merge 1 commit into
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…arpet egui GUI carpet (C-side, pure CPU). egui (immediate-mode Rust GUI) renders via egui_kittest + egui_wgpu on the wgpu crate landing on Mesa lavapipe (software Vulkan CPU adapter, backend=Vulkan device_type=Cpu - the same lavapipe path cpu-wgpu-render proved on musl). Every assertion is per-pixel closed-form / exact layout Rect / real event-injection state - "widget built" is NOT a test. egui_kittest (the official egui test harness) does the render+ event work; only comparison + goldens are self-written. Deterministic; official crates.io. Cells (three-gate fail==0 && total==EXPECTED==pass, mutation-tested; egui 0.32.3): - egui_render (31): painter rect_filled interior is exactly (0,200,80,255) per pixel (no AA, physical coords), background exactly the panel fill #1B1B1B, edge/corner boundary, all- opaque framebuffer, byte-identical re-render (determinism), font-AA-tolerant label ink bbox. - egui_layout (33): exact Response.rect vs closed form from live style (margin=8, item_spacing=(8,3)) for vertical/horizontal/2x2-grid add_sized widgets, adjacency gaps, resize re-layout, determinism. - egui_interact (24): real egui_kittest simulation - get_by_label(..).click() increments a counter + asserts pixels changed; checkbox toggle asserts bool + indicator pixels; slider arrow-key value steps; TextEdit focus+type_text asserts backing String; disabled-button no-op negative control. - egui_snapshot (7): a robust 8x8 pooled-luminance signature vs a committed golden (calibrated to 0.32.3, tolerance absorbs AA jitter) + a SHA-256 fingerprint, cross-process stable over 3 runs. Builds against official crates.io (no CN mirror); prebuild cross-compiles to dynamic-musl per arch. Snapshot golden + EXPECTED calibrated to egui 0.32.3 on lavapipe (re-run egui_snapshot with UPDATE_SNAPSHOT_GRID=1 on an egui bump). This is the egui/eframe path of the browser GUI stack (campaign rcore-os#392), alongside the Qt Widgets carpet. Signed-off-by: 林晨/禾可 <chengkelfan@qq.com>
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本 PR 新增 apps/starry/cpu-gui-egui-test：通过 egui_kittest/wgpu/lavapipe 为 StarryOS 提供四个离屏 GUI carpet，包含 rootfs 预构建、四架构 QEMU 配置和失败传播脚本。
book/guideline/feature-development.md 适用；该变更是局部的应用测试能力，不改内核 ABI 或公共接口。实现复用现有 app 的 prebuild/QEMU 模式，run_all.sh 会把任一 cell 的退出失败传递为 TEST FAILED。已对比 dev 的 cpu-concurrency，并检索开放 PR：#1820 的 wgpu 渲染 carpet 是互补的底层 WebGPU 覆盖，不与本 egui 交互/布局覆盖重复。未发现 [patch.crates-io]。
验证：git diff --check、bash -n prebuild.sh、sh -n run_all.sh 和全部新增 TOML 解析通过；但四个新增 carpet crate 的 cargo fmt --check 都失败，详见行内阻塞意见。CI 当前头部有 34 个成功、35 个预期跳过、1 个取消和 1 个失败；失败的是未触及的 Axvisor 自托管板卡 job，和该应用无关。常规 CI 未运行此 Starry app；Starry Apps workflow仅定时/手动触发，因此没有当前头部的应用 QEMU 运行证据。鉴于格式门禁已阻塞，本次未继续启动耗时的四架构 app 运行。
已检查既有 review/issue 评论：当前无历史 review 或行内讨论需要处理。清单其余审阅项已完成；未完成项仅为修复格式后重新验证并运行文档化 QEMU 流程。
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阻塞：这里及同文件多处格式不符合仓库 rustfmt。(cd apps/starry/cpu-gui-egui-test/programs/carpets/egui_interact && cargo fmt --check) 当前退出码为 1，首个差异就是该 import 的排序/合并方式，后续还有多处长调用换行差异。请对新增的四个 carpet crate 执行 cargo fmt 并提交结果，再重新验证格式检查；否则当前新增 Rust 源码不能通过项目的格式门禁。
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概述
apps/starry/cpu-gui-egui-test：egui/eframe GUI carpet(C 侧纯 CPU)。egui(immediate-mode Rust GUI)经 egui_kittest + egui_wgpu 跑 wgpu crate 落到 Mesa lavapipe(软件 Vulkan CPU adapter, backend=Vulkan device_type=Cpu, 同 cpu-wgpu-render 已证 musl 路径)。每断言都是逐像素闭式 / 精确布局 Rect / 真事件注入状态,不是"widget built"。egui_kittest(官方测试框架)负责渲染+事件,仅比对+golden 自写。官方 crates.io。Cells 与断言(host 真跑绿 lavapipe, 三门 fail==0 && total==EXPECTED==pass, mutation-tested; egui 0.32.3)
egui_renderegui_layoutegui_interactegui_snapshot共 95 断言。官方 crates.io 构建(无 CN 镜像), prebuild 交叉编译 dynamic-musl per-arch. snapshot golden+EXPECTED 标定 egui 0.32.3 on lavapipe(egui 升级重跑 UPDATE_SNAPSHOT_GRID=1)。
复用 egui/egui_kittest 官方不造 GUI 渲染器; wgpu 后端跑 lavapipe(同 wgpu-render proven). 逐像素+精确布局+真事件注入交互(状态+像素双断言). 浏览器 GUI 栈(#392)egui/eframe 路径, 与 Qt Widgets carpet(#1873)并列。
关键文件: carpets、prebuild.sh。