Add niri-visual-tests

12 files changed, 1062 insertions, 7 deletions

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b57abcbb..3828a500 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -52,10 +52,35 @@ jobs:
         run: cargo build ${{ matrix.release-flag }} --features profile-with-tracy
 
       - name: Build Tests
-        run: cargo test --no-run --all ${{ matrix.release-flag }}
+        run: cargo test --no-run --all --exclude niri-visual-tests ${{ matrix.release-flag }}
 
       - name: Test
-        run: cargo test --all ${{ matrix.release-flag }} -- --nocapture
+        run: cargo test --all --exclude niri-visual-tests ${{ matrix.release-flag }} -- --nocapture
+
+  visual-tests:
+    strategy:
+      fail-fast: false
+
+    name: visual tests
+    runs-on: ubuntu-22.04
+    container: ubuntu:23.10
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          show-progress: false
+
+      - name: Install dependencies
+        run: |
+          apt-get update -y
+          apt-get install -y curl gcc clang libudev-dev libgbm-dev libxkbcommon-dev libegl1-mesa-dev libwayland-dev libinput-dev libdbus-1-dev libsystemd-dev libseat-dev libpipewire-0.3-dev libpango1.0-dev libadwaita-1-dev
+
+      - uses: dtolnay/rust-toolchain@stable
+
+      - uses: Swatinem/rust-cache@v2
+
+      - name: Build
+        run: cargo build --package niri-visual-tests
 
   clippy:
     strategy:
@@ -73,7 +98,7 @@ jobs:
       - name: Install dependencies
         run: |
           apt-get update -y
-          apt-get install -y curl gcc clang libudev-dev libgbm-dev libxkbcommon-dev libegl1-mesa-dev libwayland-dev libinput-dev libdbus-1-dev libsystemd-dev libseat-dev libpipewire-0.3-dev libpango1.0-dev
+          apt-get install -y curl gcc clang libudev-dev libgbm-dev libxkbcommon-dev libegl1-mesa-dev libwayland-dev libinput-dev libdbus-1-dev libsystemd-dev libseat-dev libpipewire-0.3-dev libpango1.0-dev libadwaita-1-dev
 
       - uses: dtolnay/rust-toolchain@stable
         with:
@@ -113,8 +138,8 @@ jobs:
       - name: Install dependencies
         run: |
           sudo dnf update -y
-          sudo dnf install -y cargo gcc libudev-devel libgbm-devel libxkbcommon-devel wayland-devel libinput-devel dbus-devel systemd-devel libseat-devel pipewire-devel pango-devel cairo-gobject-devel clang
+          sudo dnf install -y cargo gcc libudev-devel libgbm-devel libxkbcommon-devel wayland-devel libinput-devel dbus-devel systemd-devel libseat-devel pipewire-devel pango-devel cairo-gobject-devel clang libadwaita-devel
 
       - uses: Swatinem/rust-cache@v2
-      - run: cargo build
+      - run: cargo build --all
 
diff --git a/Cargo.lock b/Cargo.lock
index db38d427..fd405670 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -995,6 +995,16 @@ dependencies = [
 ]
 
 [[package]]
+name = "field-offset"
+version = "0.3.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "38e2275cc4e4fc009b0669731a1e5ab7ebf11f469eaede2bab9309a5b4d6057f"
+dependencies = [
+ "memoffset 0.9.0",
+ "rustc_version",
+]
+
+[[package]]
 name = "flate2"
 version = "1.0.28"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1171,6 +1181,63 @@ dependencies = [
 ]
 
 [[package]]
+name = "gdk-pixbuf"
+version = "0.19.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c311c47800051b87de1335e8792774d7cec551c91a0a3d109ab21d76b36f208f"
+dependencies = [
+ "gdk-pixbuf-sys",
+ "gio",
+ "glib",
+ "libc",
+]
+
+[[package]]
+name = "gdk-pixbuf-sys"
+version = "0.19.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3dcbd04c1b2c4834cc008b4828bc917d062483b88d26effde6342e5622028f96"
+dependencies = [
+ "gio-sys",
+ "glib-sys",
+ "gobject-sys",
+ "libc",
+ "system-deps",
+]
+
+[[package]]
+name = "gdk4"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6771942f85a2beaa220c64739395e4401b9fab4a52aba9b503fa1e6ed4d4d806"
+dependencies = [
+ "cairo-rs",
+ "gdk-pixbuf",
+ "gdk4-sys",
+ "gio",
+ "glib",
+ "libc",
+ "pango",
+]
+
+[[package]]
+name = "gdk4-sys"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1eb95854fab65072023a7814434f003db571d6e45c287c0b0c540c1c78bdf6ae"
+dependencies = [
+ "cairo-sys-rs",
+ "gdk-pixbuf-sys",
+ "gio-sys",
+ "glib-sys",
+ "gobject-sys",
+ "libc",
+ "pango-sys",
+ "pkg-config",
+ "system-deps",
+]
+
+[[package]]
 name = "generator"
 version = "0.7.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1339,6 +1406,114 @@ dependencies = [
 ]
 
 [[package]]
+name = "graphene-rs"
+version = "0.19.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "147827e4f506f8073ac3ec5b28cc2255bdf3abc30f5b4e101a80506eebe11d2c"
+dependencies = [
+ "glib",
+ "graphene-sys",
+ "libc",
+]
+
+[[package]]
+name = "graphene-sys"
+version = "0.19.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "236ed66cc9b18d8adf233716f75de803d0bf6fc806f60d14d948974a12e240d0"
+dependencies = [
+ "glib-sys",
+ "libc",
+ "pkg-config",
+ "system-deps",
+]
+
+[[package]]
+name = "gsk4"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0e8ce8dee0fd87a11002214b1204ff18c9272fbd530408f0884a0f9b25dc31de"
+dependencies = [
+ "cairo-rs",
+ "gdk4",
+ "glib",
+ "graphene-rs",
+ "gsk4-sys",
+ "libc",
+ "pango",
+]
+
+[[package]]
+name = "gsk4-sys"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2660a652da5b662d43924df19ba40d73f015ed427329ef51d2b1360a4e0dc0e4"
+dependencies = [
+ "cairo-sys-rs",
+ "gdk4-sys",
+ "glib-sys",
+ "gobject-sys",
+ "graphene-sys",
+ "libc",
+ "pango-sys",
+ "system-deps",
+]
+
+[[package]]
+name = "gtk4"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7d26ffa3ec6316ccaa1df62d3e7f5bae1637c0acbb43f250fabef38319f73c64"
+dependencies = [
+ "cairo-rs",
+ "field-offset",
+ "futures-channel",
+ "gdk-pixbuf",
+ "gdk4",
+ "gio",
+ "glib",
+ "graphene-rs",
+ "gsk4",
+ "gtk4-macros",
+ "gtk4-sys",
+ "libc",
+ "pango",
+]
+
+[[package]]
+name = "gtk4-macros"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c8b86439e9896f6f3f47c3d8077c5c8205174078760afdabd9098a8e9e937d97"
+dependencies = [
+ "anyhow",
+ "proc-macro-crate 3.1.0",
+ "proc-macro-error",
+ "proc-macro2",
+ "quote",
+ "syn 1.0.109",
+]
+
+[[package]]
+name = "gtk4-sys"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2abc0a6d356d59a3806021829ce6ed3e70bba3509b41a535fedcb09fae13fbc0"
+dependencies = [
+ "cairo-sys-rs",
+ "gdk-pixbuf-sys",
+ "gdk4-sys",
+ "gio-sys",
+ "glib-sys",
+ "gobject-sys",
+ "graphene-sys",
+ "gsk4-sys",
+ "libc",
+ "pango-sys",
+ "system-deps",
+]
+
+[[package]]
 name = "hashbrown"
 version = "0.14.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1546,6 +1721,38 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "830d08ce1d1d941e6b30645f1a0eb5643013d835ce3779a5fc208261dbe10f55"
 
 [[package]]
+name = "libadwaita"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "91b4990248b9e1ec5e72094a2ccaea70ec3809f88f6fd52192f2af306b87c5d9"
+dependencies = [
+ "gdk-pixbuf",
+ "gdk4",
+ "gio",
+ "glib",
+ "gtk4",
+ "libadwaita-sys",
+ "libc",
+ "pango",
+]
+
+[[package]]
+name = "libadwaita-sys"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "23a748e4e92be1265cd9e93d569c0b5dfc7814107985aa6743d670ab281ea1a8"
+dependencies = [
+ "gdk4-sys",
+ "gio-sys",
+ "glib-sys",
+ "gobject-sys",
+ "gtk4-sys",
+ "libc",
+ "pango-sys",
+ "system-deps",
+]
+
+[[package]]
 name = "libc"
 version = "0.2.153"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1897,6 +2104,20 @@ dependencies = [
 ]
 
 [[package]]
+name = "niri-visual-tests"
+version = "0.1.1"
+dependencies = [
+ "anyhow",
+ "gtk4",
+ "libadwaita",
+ "niri",
+ "niri-config",
+ "smithay",
+ "tracing",
+ "tracing-subscriber",
+]
+
+[[package]]
 name = "nix"
 version = "0.26.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -2538,6 +2759,15 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "08d43f7aa6b08d49f382cde6a7982047c3426db949b1424bc4b7ec9ae12c6ce2"
 
 [[package]]
+name = "rustc_version"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bfa0f585226d2e68097d4f95d113b15b83a82e819ab25717ec0590d9584ef366"
+dependencies = [
+ "semver",
+]
+
+[[package]]
 name = "rustix"
 version = "0.37.27"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -2616,6 +2846,12 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "621e3680f3e07db4c9c2c3fb07c6223ab2fab2e54bd3c04c3ae037990f428c32"
 
 [[package]]
+name = "semver"
+version = "1.0.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b97ed7a9823b74f99c7742f5336af7be5ecd3eeafcb1507d1fa93347b1d589b0"
+
+[[package]]
 name = "serde"
 version = "1.0.196"
 source = "registry+https://github.com/rust-lang/crates.io-index"
diff --git a/Cargo.toml b/Cargo.toml
index f0dbdc8e..64f1d41a 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,3 +1,6 @@
+[workspace]
+members = ["niri-visual-tests"]
+
 [workspace.package]
 version = "0.1.1"
 description = "A scrollable-tiling Wayland compositor"
@@ -7,10 +10,12 @@ edition = "2021"
 repository = "https://github.com/YaLTeR/niri"
 
 [workspace.dependencies]
+anyhow = "1.0.79"
 bitflags = "2.4.2"
 directories = "5.0.1"
 serde = { version = "1.0.196", features = ["derive"] }
 tracing = { version = "0.1.40", features = ["max_level_trace", "release_max_level_debug"] }
+tracing-subscriber = { version = "0.3.18", features = ["env-filter"] }
 tracy-client = { version = "0.16.5", default-features = false }
 
 [workspace.dependencies.smithay]
@@ -35,7 +40,7 @@ readme = "README.md"
 keywords = ["wayland", "compositor", "tiling", "smithay", "wm"]
 
 [dependencies]
-anyhow = { version = "1.0.79" }
+anyhow.workspace = true
 arrayvec = "0.7.4"
 async-channel = { version = "2.1.1", optional = true }
 async-io = { version = "1.13.0", optional = true }
@@ -61,7 +66,7 @@ sd-notify = "0.4.1"
 serde.workspace = true
 serde_json = "1.0.113"
 smithay-drm-extras.workspace = true
-tracing-subscriber = { version = "0.3.18", features = ["env-filter"] }
+tracing-subscriber.workspace = true
 tracing.workspace = true
 tracy-client.workspace = true
 url = { version = "2.5.0", optional = true }
diff --git a/niri-visual-tests/Cargo.toml b/niri-visual-tests/Cargo.toml
new file mode 100644
index 00000000..47825e59
--- /dev/null
+++ b/niri-visual-tests/Cargo.toml
@@ -0,0 +1,18 @@
+[package]
+name = "niri-visual-tests"
+version.workspace = true
+description.workspace = true
+authors.workspace = true
+license.workspace = true
+edition.workspace = true
+repository.workspace = true
+
+[dependencies]
+adw = { version = "0.6.0", package = "libadwaita", features = ["v1_4"] }
+anyhow.workspace = true
+gtk = { version = "0.8.0", package = "gtk4", features = ["v4_12"] }
+niri = { version = "0.1.1", path = ".." }
+niri-config = { version = "0.1.1", path = "../niri-config" }
+smithay.workspace = true
+tracing.workspace = true
+tracing-subscriber.workspace = true
diff --git a/niri-visual-tests/README.md b/niri-visual-tests/README.md
new file mode 100644
index 00000000..34d5ca1e
--- /dev/null
+++ b/niri-visual-tests/README.md
@@ -0,0 +1,14 @@
+# niri-visual-tests
+
+> [!NOTE]
+>
+> This is a development-only app, you shouldn't package it.
+
+This app contains a number of hard-coded test scenarios for visual inspection.
+It uses the real niri layout and rendering code, but with mock windows instead of Wayland clients.
+The idea is to go through the test scenarios and check that everything *looks* right.
+
+## Running
+
+You will need recent GTK and libadwaita.
+Then, `cargo run`.
diff --git a/niri-visual-tests/resources/style.css b/niri-visual-tests/resources/style.css
new file mode 100644
index 00000000..4f74d041
--- /dev/null
+++ b/niri-visual-tests/resources/style.css
@@ -0,0 +1,3 @@
+.anim-control-bar {
+    padding: 12px;
+}
diff --git a/niri-visual-tests/src/cases/mod.rs b/niri-visual-tests/src/cases/mod.rs
new file mode 100644
index 00000000..b7d71cd0
--- /dev/null
+++ b/niri-visual-tests/src/cases/mod.rs
@@ -0,0 +1,21 @@
+use std::time::Duration;
+
+use smithay::backend::renderer::element::RenderElement;
+use smithay::backend::renderer::gles::GlesRenderer;
+use smithay::utils::{Physical, Size};
+
+pub mod tile;
+pub mod window;
+
+pub trait TestCase {
+    fn resize(&mut self, width: i32, height: i32);
+    fn are_animations_ongoing(&self) -> bool {
+        false
+    }
+    fn advance_animations(&mut self, _current_time: Duration) {}
+    fn render(
+        &mut self,
+        renderer: &mut GlesRenderer,
+        size: Size<i32, Physical>,
+    ) -> Vec<Box<dyn RenderElement<GlesRenderer>>>;
+}
diff --git a/niri-visual-tests/src/cases/tile.rs b/niri-visual-tests/src/cases/tile.rs
new file mode 100644
index 00000000..cdf1e5f6
--- /dev/null
+++ b/niri-visual-tests/src/cases/tile.rs
@@ -0,0 +1,83 @@
+use std::rc::Rc;
+use std::time::Duration;
+
+use niri::layout::tile::Tile;
+use niri::layout::Options;
+use niri_config::Color;
+use smithay::backend::renderer::element::RenderElement;
+use smithay::backend::renderer::gles::GlesRenderer;
+use smithay::utils::{Logical, Physical, Point, Scale, Size};
+
+use super::TestCase;
+use crate::test_window::TestWindow;
+
+pub struct JustTile {
+    window: TestWindow,
+    tile: Tile<TestWindow>,
+}
+
+impl JustTile {
+    pub fn freeform(size: Size<i32, Logical>) -> Self {
+        let window = TestWindow::freeform(0);
+        let mut rv = Self::with_window(window);
+        rv.tile.request_tile_size(size);
+        rv.window.communicate();
+        rv
+    }
+
+    pub fn fixed_size(size: Size<i32, Logical>) -> Self {
+        let window = TestWindow::fixed_size(0);
+        let mut rv = Self::with_window(window);
+        rv.tile.request_tile_size(size);
+        rv.window.communicate();
+        rv
+    }
+
+    pub fn fixed_size_with_csd_shadow(size: Size<i32, Logical>) -> Self {
+        let window = TestWindow::fixed_size(0);
+        window.set_csd_shadow_width(64);
+        let mut rv = Self::with_window(window);
+        rv.tile.request_tile_size(size);
+        rv.window.communicate();
+        rv
+    }
+
+    pub fn with_window(window: TestWindow) -> Self {
+        let options = Options {
+            border: niri_config::FocusRing {
+                off: false,
+                width: 32,
+                active_color: Color::new(255, 163, 72, 255),
+                ..Default::default()
+            },
+            ..Default::default()
+        };
+        let tile = Tile::new(window.clone(), Rc::new(options));
+        Self { window, tile }
+    }
+}
+
+impl TestCase for JustTile {
+    fn resize(&mut self, width: i32, height: i32) {
+        self.tile.request_tile_size(Size::from((width, height)));
+        self.window.communicate();
+    }
+
+    fn advance_animations(&mut self, current_time: Duration) {
+        self.tile.advance_animations(current_time, true);
+    }
+
+    fn render(
+        &mut self,
+        renderer: &mut GlesRenderer,
+        size: Size<i32, Physical>,
+    ) -> Vec<Box<dyn RenderElement<GlesRenderer>>> {
+        let tile_size = self.tile.tile_size().to_physical(1);
+        let location = Point::from(((size.w - tile_size.w) / 2, (size.h - tile_size.h) / 2));
+
+        self.tile
+            .render(renderer, location, Scale::from(1.))
+            .map(|elem| Box::new(elem) as _)
+            .collect()
+    }
+}
diff --git a/niri-visual-tests/src/cases/window.rs b/niri-visual-tests/src/cases/window.rs
new file mode 100644
index 00000000..869cbf45
--- /dev/null
+++ b/niri-visual-tests/src/cases/window.rs
@@ -0,0 +1,57 @@
+use niri::layout::LayoutElement;
+use smithay::backend::renderer::element::RenderElement;
+use smithay::backend::renderer::gles::GlesRenderer;
+use smithay::utils::{Logical, Physical, Point, Scale, Size};
+
+use super::TestCase;
+use crate::test_window::TestWindow;
+
+pub struct JustWindow {
+    window: TestWindow,
+}
+
+impl JustWindow {
+    pub fn freeform(size: Size<i32, Logical>) -> Self {
+        let window = TestWindow::freeform(0);
+        window.request_size(size);
+        window.communicate();
+        Self { window }
+    }
+
+    pub fn fixed_size(size: Size<i32, Logical>) -> Self {
+        let window = TestWindow::fixed_size(0);
+        window.request_size(size);
+        window.communicate();
+        Self { window }
+    }
+
+    pub fn fixed_size_with_csd_shadow(size: Size<i32, Logical>) -> Self {
+        let window = TestWindow::fixed_size(0);
+        window.set_csd_shadow_width(64);
+        window.request_size(size);
+        window.communicate();
+        Self { window }
+    }
+}
+
+impl TestCase for JustWindow {
+    fn resize(&mut self, width: i32, height: i32) {
+        self.window.request_size(Size::from((width, height)));
+        self.window.communicate();
+    }
+
+    fn render(
+        &mut self,
+        renderer: &mut GlesRenderer,
+        size: Size<i32, Physical>,
+    ) -> Vec<Box<dyn RenderElement<GlesRenderer>>> {
+        let win_size = self.window.size().to_physical(1);
+        let location = Point::from(((size.w - win_size.w) / 2, (size.h - win_size.h) / 2));
+
+        self.window
+            .render(renderer, location, Scale::from(1.))
+            .into_iter()
+            .map(|elem| Box::new(elem) as _)
+            .collect()
+    }
+}
diff --git a/niri-visual-tests/src/main.rs b/niri-visual-tests/src/main.rs
new file mode 100644
index 00000000..99919043
--- /dev/null
+++ b/niri-visual-tests/src/main.rs
@@ -0,0 +1,142 @@
+#[macro_use]
+extern crate tracing;
+
+use std::env;
+use std::sync::atomic::Ordering;
+
+use adw::prelude::{AdwApplicationWindowExt, NavigationPageExt};
+use cases::tile::JustTile;
+use cases::window::JustWindow;
+use gtk::prelude::{
+    AdjustmentExt, ApplicationExt, ApplicationExtManual, BoxExt, GtkWindowExt, WidgetExt,
+};
+use gtk::{gdk, gio, glib};
+use niri::animation::ANIMATION_SLOWDOWN;
+use smithay::utils::{Logical, Size};
+use smithay_view::SmithayView;
+use tracing_subscriber::EnvFilter;
+
+use crate::cases::TestCase;
+
+mod cases;
+mod smithay_view;
+mod test_window;
+
+fn main() -> glib::ExitCode {
+    let directives =
+        env::var("RUST_LOG").unwrap_or_else(|_| "niri-visual-tests=debug,niri=debug".to_owned());
+    let env_filter = EnvFilter::builder().parse_lossy(directives);
+    tracing_subscriber::fmt()
+        .compact()
+        .with_env_filter(env_filter)
+        .init();
+
+    let app = adw::Application::new(None::<&str>, gio::ApplicationFlags::NON_UNIQUE);
+    app.connect_startup(on_startup);
+    app.connect_activate(build_ui);
+    app.run()
+}
+
+fn on_startup(_app: &adw::Application) {
+    // Load our CSS.
+    let provider = gtk::CssProvider::new();
+    provider.load_from_string(include_str!("../resources/style.css"));
+    if let Some(display) = gdk::Display::default() {
+        gtk::style_context_add_provider_for_display(
+            &display,
+            &provider,
+            gtk::STYLE_PROVIDER_PRIORITY_APPLICATION,
+        );
+    }
+}
+
+fn build_ui(app: &adw::Application) {
+    let stack = gtk::Stack::new();
+
+    struct S {
+        stack: gtk::Stack,
+    }
+
+    impl S {
+        fn add<T: TestCase + 'static>(
+            &self,
+            make: impl Fn(Size<i32, Logical>) -> T + 'static,
+            title: &str,
+        ) {
+            let view = SmithayView::new(make);
+            self.stack.add_titled(&view, None, title);
+        }
+    }
+
+    let s = S {
+        stack: stack.clone(),
+    };
+
+    s.add(JustWindow::freeform, "Freeform Window");
+    s.add(JustWindow::fixed_size, "Fixed Size Window");
+    s.add(
+        JustWindow::fixed_size_with_csd_shadow,
+        "Fixed Size Window - CSD Shadow",
+    );
+    s.add(JustTile::freeform, "Freeform Tile");
+    s.add(JustTile::fixed_size, "Fixed Size Tile");
+    s.add(
+        JustTile::fixed_size_with_csd_shadow,
+        "Fixed Size Tile - CSD Shadow",
+    );
+
+    let content_headerbar = adw::HeaderBar::new();
+
+    let anim_adjustment = gtk::Adjustment::new(1., 0., 10., 0.1, 0.5, 0.);
+    anim_adjustment
+        .connect_value_changed(|adj| ANIMATION_SLOWDOWN.store(adj.value(), Ordering::SeqCst));
+    let anim_scale = gtk::Scale::new(gtk::Orientation::Horizontal, Some(&anim_adjustment));
+    anim_scale.set_hexpand(true);
+
+    let anim_control_bar = gtk::Box::new(gtk::Orientation::Horizontal, 6);
+    anim_control_bar.add_css_class("anim-control-bar");
+    anim_control_bar.append(&gtk::Label::new(Some("Slowdown")));
+    anim_control_bar.append(&anim_scale);
+
+    let content_view = adw::ToolbarView::new();
+    content_view.set_top_bar_style(adw::ToolbarStyle::RaisedBorder);
+    content_view.set_bottom_bar_style(adw::ToolbarStyle::RaisedBorder);
+    content_view.add_top_bar(&content_headerbar);
+    content_view.add_bottom_bar(&anim_control_bar);
+    content_view.set_content(Some(&stack));
+    let content = adw::NavigationPage::new(
+        &content_view,
+        stack
+            .page(&stack.visible_child().unwrap())
+            .title()
+            .as_deref()
+            .unwrap(),
+    );
+
+    let sidebar_header = adw::HeaderBar::new();
+    let stack_sidebar = gtk::StackSidebar::new();
+    stack_sidebar.set_stack(&stack);
+    let sidebar_view = adw::ToolbarView::new();
+    sidebar_view.add_top_bar(&sidebar_header);
+    sidebar_view.set_content(Some(&stack_sidebar));
+    let sidebar = adw::NavigationPage::new(&sidebar_view, "Tests");
+
+    let split_view = adw::NavigationSplitView::new();
+    split_view.set_content(Some(&content));
+    split_view.set_sidebar(Some(&sidebar));
+
+    stack.connect_visible_child_notify(move |stack| {
+        content.set_title(
+            stack
+                .visible_child()
+                .and_then(|c| stack.page(&c).title())
+                .as_deref()
+                .unwrap_or_default(),
+        )
+    });
+
+    let window = adw::ApplicationWindow::new(app);
+    window.set_title(Some("niri visual tests"));
+    window.set_content(Some(&split_view));
+    window.present();
+}
diff --git a/niri-visual-tests/src/smithay_view.rs b/niri-visual-tests/src/smithay_view.rs
new file mode 100644
index 00000000..db8eb9ec
--- /dev/null
+++ b/niri-visual-tests/src/smithay_view.rs
@@ -0,0 +1,245 @@
+use gtk::glib;
+use gtk::subclass::prelude::*;
+use smithay::utils::{Logical, Size};
+
+use crate::cases::TestCase;
+
+mod imp {
+    use std::cell::{Cell, OnceCell, RefCell};
+    use std::ptr::null;
+
+    use anyhow::{ensure, Context};
+    use gtk::gdk;
+    use gtk::prelude::*;
+    use niri::utils::get_monotonic_time;
+    use smithay::backend::egl::ffi::egl;
+    use smithay::backend::egl::EGLContext;
+    use smithay::backend::renderer::gles::{Capability, GlesRenderer};
+    use smithay::backend::renderer::{Frame, Renderer, Unbind};
+    use smithay::utils::{Physical, Rectangle, Scale, Transform};
+
+    use super::*;
+
+    type DynMakeTestCase = Box<dyn Fn(Size<i32, Logical>) -> Box<dyn TestCase>>;
+
+    #[derive(Default)]
+    pub struct SmithayView {
+        gl_area: gtk::GLArea,
+        size: Cell<(i32, i32)>,
+        renderer: RefCell<Option<Result<GlesRenderer, ()>>>,
+        pub make_test_case: OnceCell<DynMakeTestCase>,
+        test_case: RefCell<Option<Box<dyn TestCase>>>,
+    }
+
+    #[glib::object_subclass]
+    impl ObjectSubclass for SmithayView {
+        const NAME: &'static str = "NiriSmithayView";
+        type Type = super::SmithayView;
+        type ParentType = gtk::Widget;
+
+        fn class_init(klass: &mut Self::Class) {
+            klass.set_layout_manager_type::<gtk::BinLayout>();
+        }
+    }
+
+    impl ObjectImpl for SmithayView {
+        fn constructed(&self) {
+            let obj = self.obj();
+
+            self.parent_constructed();
+
+            self.gl_area.set_allowed_apis(gdk::GLAPI::GLES);
+            self.gl_area.set_parent(&*obj);
+
+            self.gl_area.connect_resize({
+                let imp = self.downgrade();
+                move |_, width, height| {
+                    if let Some(imp) = imp.upgrade() {
+                        imp.resize(width, height);
+                    }
+                }
+            });
+
+            self.gl_area.connect_render({
+                let imp = self.downgrade();
+                move |_, gl_context| {
+                    if let Some(imp) = imp.upgrade() {
+                        if let Err(err) = imp.render(gl_context) {
+                            warn!("error rendering: {err:?}");
+                        }
+                    }
+                    glib::Propagation::Stop
+                }
+            });
+
+            obj.add_tick_callback(|obj, _frame_clock| {
+                let imp = obj.imp();
+
+                if let Some(case) = &mut *imp.test_case.borrow_mut() {
+                    if case.are_animations_ongoing() {
+                        imp.gl_area.queue_draw();
+                    }
+                }
+
+                glib::ControlFlow::Continue
+            });
+        }
+
+        fn dispose(&self) {
+            self.gl_area.unparent();
+        }
+    }
+
+    impl WidgetImpl for SmithayView {
+        fn unmap(&self) {
+            self.test_case.replace(None);
+            self.parent_unmap();
+        }
+
+        fn unrealize(&self) {
+            self.renderer.replace(None);
+            self.parent_unrealize();
+        }
+    }
+
+    impl SmithayView {
+        fn resize(&self, width: i32, height: i32) {
+            self.size.set((width, height));
+
+            if let Some(case) = &mut *self.test_case.borrow_mut() {
+                case.resize(width, height);
+            }
+        }
+
+        fn render(&self, _gl_context: &gdk::GLContext) -> anyhow::Result<()> {
+            // Set up the Smithay renderer.
+            let mut renderer = self.renderer.borrow_mut();
+            let renderer = renderer.get_or_insert_with(|| {
+                unsafe { create_renderer() }
+                    .map_err(|err| warn!("error creating a Smithay renderer: {err:?}"))
+            });
+            let Ok(renderer) = renderer else {
+                return Ok(());
+            };
+
+            let size = self.size.get();
+
+            // Create the test case if missing.
+            let mut case = self.test_case.borrow_mut();
+            let case = case.get_or_insert_with(|| {
+                let make = self.make_test_case.get().unwrap();
+                make(Size::from(size))
+            });
+
+            case.advance_animations(get_monotonic_time());
+
+            let rect: Rectangle<i32, Physical> = Rectangle::from_loc_and_size((0, 0), size);
+
+            let elements = unsafe {
+                with_framebuffer_save_restore(renderer, |renderer| {
+                    case.render(renderer, Size::from(size))
+                })
+            }?;
+
+            let mut frame = renderer
+                .render(rect.size, Transform::Normal)
+                .context("error creating frame")?;
+
+            frame
+                .clear([0.3, 0.3, 0.3, 1.], &[rect])
+                .context("error clearing")?;
+
+            for element in elements.iter().rev() {
+                let src = element.src();
+                let dst = element.geometry(Scale::from(1.));
+
+                if let Some(mut damage) = rect.intersection(dst) {
+                    damage.loc -= dst.loc;
+                    element
+                        .draw(&mut frame, src, dst, &[damage])
+                        .context("error drawing element")?;
+                }
+            }
+
+            Ok(())
+        }
+    }
+
+    unsafe fn create_renderer() -> anyhow::Result<GlesRenderer> {
+        smithay::backend::egl::ffi::make_sure_egl_is_loaded()
+            .context("error loading EGL symbols in Smithay")?;
+
+        let egl_display = egl::GetCurrentDisplay();
+        ensure!(egl_display != egl::NO_DISPLAY, "no current EGL display");
+
+        let egl_context = egl::GetCurrentContext();
+        ensure!(egl_context != egl::NO_CONTEXT, "no current EGL context");
+
+        // There's no config ID on the EGL context and there's no current EGL surface, but we don't
+        // really use it anyway so just get some random one.
+        let mut egl_config_id = null();
+        let mut num_configs = 0;
+        let res = egl::GetConfigs(egl_display, &mut egl_config_id, 1, &mut num_configs);
+        ensure!(res == egl::TRUE, "error choosing EGL config");
+        ensure!(num_configs != 0, "no EGL config");
+
+        let egl_context = EGLContext::from_raw(egl_display, egl_config_id as *const _, egl_context)
+            .context("error creating EGL context")?;
+        let capabilities = GlesRenderer::supported_capabilities(&egl_context)
+            .context("error getting supported renderer capabilities")?
+            .into_iter()
+            .filter(|c| *c != Capability::ColorTransformations);
+
+        GlesRenderer::with_capabilities(egl_context, capabilities)
+            .context("error creating GlesRenderer")
+    }
+
+    unsafe fn with_framebuffer_save_restore<T>(
+        renderer: &mut GlesRenderer,
+        f: impl FnOnce(&mut GlesRenderer) -> T,
+    ) -> anyhow::Result<T> {
+        let mut framebuffer = 0;
+        renderer
+            .with_context(|gl| unsafe {
+                gl.GetIntegerv(
+                    smithay::backend::renderer::gles::ffi::FRAMEBUFFER_BINDING,
+                    &mut framebuffer,
+                );
+            })
+            .context("error running closure in GL context")?;
+        ensure!(framebuffer != 0, "error getting the framebuffer");
+
+        let rv = f(renderer);
+
+        renderer.unbind().context("error unbinding")?;
+        renderer
+            .with_context(|gl| unsafe {
+                gl.BindFramebuffer(
+                    smithay::backend::renderer::gles::ffi::FRAMEBUFFER,
+                    framebuffer as u32,
+                );
+            })
+            .context("error running closure in GL context")?;
+
+        Ok(rv)
+    }
+}
+
+glib::wrapper! {
+    pub struct SmithayView(ObjectSubclass<imp::SmithayView>)
+        @extends gtk::Widget;
+}
+
+impl SmithayView {
+    pub fn new<T: TestCase + 'static>(
+        make_test_case: impl Fn(Size<i32, Logical>) -> T + 'static,
+    ) -> Self {
+        let obj: Self = glib::Object::builder().build();