Split most of the masonry crate into masonry_core sub-crate. (#910)

This change is done very carefully to minimize the number of changed
files, and use almost only file renames.
This is both for avoiding merge conflicts, keeping file history
unbroken, and keeping the PR easy to review.

A future PR will rename masonry to masonry_core, masonry_winit to
masonry change all the doc tests and snapshots that depend on those
names, etc.

After *that*, future PRs will have actual code changes splitting winit
away from masonry_core.

.gitattributes

@@ -1,3 +1,4 @@
 # LFS settings
-# If changing, also change in .github/workflows/ci.yml
-masonry/**/screenshots/*.png filter=lfs diff=lfs merge=lfs -text
+# If changed, also change in .github/workflows/ci.yml
+# We assume that any PNG file in a folder named "screenshots/" is a screenshot test output.
+**/screenshots/*.png filter=lfs diff=lfs merge=lfs -text

.github/workflows/ci.yml

@@ -10,14 +10,13 @@ env:
   # plus all the README.md files of the affected packages.
   RUST_MIN_VER: "1.85"
   # List of packages that can not target Wasm.
-  NO_WASM_PKGS: "--exclude masonry --exclude xilem"
+  NO_WASM_PKGS: "--exclude masonry --exclude masonry_winit --exclude xilem"
   # Only some of our examples support Android (primarily due to extra required boilerplate).
   ANDROID_TARGETS: "-p xilem --example mason_android --example calc_android --example stopwatch_android --example variable_clock_android --example http_cats_android --example to_do_mvc_android"
   # Whether the workspace contains Rust code using the debug_assertions configuration option.
   USING_DEBUG_ASSERTIONS: "true"
   # The files stored in LFS the tests need to access
-  # This should mirror the values in .gitattributes
-  LFS_FILES: "masonry/**/screenshots/*.png"
+  LFS_FILES: "**/screenshots/*.png"
 
 
 # Rationale
@@ -109,6 +108,9 @@ jobs:
       - name: Run cargo rdme (masonry)
         run: cargo rdme --check --heading-base-level=0 --workspace-project=masonry
 
+      - name: Run cargo rdme (masonry_winit)
+        run: cargo rdme --check --heading-base-level=0 --workspace-project=masonry_winit
+    
       - name: Run cargo rdme (tree_arena)
         run: cargo rdme --check --heading-base-level=0 --workspace-project=tree_arena
       

.typos.toml

@@ -28,7 +28,7 @@ seeked = "seeked" # Part of the HTML standard
 # Include .github, .cargo, etc.
 ignore-hidden = false
 extend-exclude = [
-    "masonry/resources/i18n",
+    "masonry_core/resources/i18n",
     # /.git isn't in .gitignore, because git never tracks it.
     # Typos doesn't know that, though.
     "/.git",

ARCHITECTURE.md

@@ -87,3 +87,14 @@ An implementation of Xilem running on the DOM.
 
 ### `masonry/`
 See `ARCHITECTURE.md` file located under `crates/masonry/doc`
+
+## Screenshot tests
+
+Multiple crates in this repository use screenshot tests to ensure the UI renders as expected.
+
+Screenshots are all saved as PNG files in `screenshots/` folders at different places in the repo.
+Because of this, we assume that any file matching `**/screenshots/*.png` is a saved screenshot.
+
+The screenshots are stored using git LFS, which adds some minor complications but avoids the overhead of committing files directly to Git.
+In theory, using LFS gives us a stronger dependency on Github.
+In practice, the screenshots can be re-generated at any point by running the test suite, and they're guaranteed to be valid since only commits passing the test suite are merged.

Cargo.lock

@@ -1966,6 +1966,41 @@ dependencies = [
  "winit",
 ]
 
+[[package]]
+name = "masonry_winit"
+version = "0.2.0"
+dependencies = [
+ "accesskit",
+ "accesskit_winit",
+ "anymap3",
+ "assert_matches",
+ "cursor-icon",
+ "dpi",
+ "float-cmp",
+ "futures-intrusive",
+ "image",
+ "insta",
+ "keyboard-types",
+ "masonry",
+ "once_cell",
+ "parley",
+ "pollster",
+ "profiling",
+ "serde",
+ "serde_json",
+ "smallvec",
+ "time",
+ "tracing",
+ "tracing-subscriber",
+ "tracing_android_trace",
+ "tree_arena",
+ "vello",
+ "web-time",
+ "wgpu",
+ "wgpu-profiler",
+ "winit",
+]
+
 [[package]]
 name = "matchers"
 version = "0.1.0"

Cargo.toml

@@ -4,6 +4,7 @@ members = [
     "xilem",
     "xilem_core",
     "masonry",
+    "masonry_core",
 
     "xilem_web",
     "xilem_web/web_examples/counter",
@@ -84,7 +85,7 @@ clippy.wildcard_dependencies = "warn"
 # END LINEBENDER LINT SET
 
 [workspace.dependencies]
-masonry = { version = "0.2.0", path = "masonry" }
+masonry = { version = "0.2.0", path = "masonry_core" }
 xilem_core = { version = "0.1.0", path = "xilem_core" }
 tree_arena = { version = "0.1.0", path = "tree_arena" }
 vello = "0.4.0"

masonry/Cargo.toml

@@ -1,5 +1,5 @@
 [package]
-name = "masonry"
+name = "masonry_winit"
 version = "0.2.0"
 description = "Data-oriented Rust UI design toolkit."
 keywords = ["gui", "ui", "toolkit"]
@@ -21,20 +21,14 @@ cargo-args = ["-Zunstable-options", "-Zrustdoc-scrape-examples"]
 
 [features]
 default = []
-# Enables tracing using tracy if the default Masonry tracing is used.
-# https://github.com/wolfpld/tracy can be connected to when this feature is enabled.
-tracy = [
-    "tracing-tracy/enable",
-    "dep:tracing-tracy",
-    "dep:wgpu-profiler",
-    "wgpu-profiler/tracy",
-    "vello/wgpu-profiler",
-]
+tracy = ["masonry/tracy"]
 
 [lints]
 workspace = true
 
 [dependencies]
+# TODO - Rename this dependency to masonry_core
+masonry.workspace = true
 vello.workspace = true
 wgpu.workspace = true
 parley.workspace = true
@@ -54,11 +48,9 @@ accesskit_winit.workspace = true
 time = { workspace = true, features = ["macros", "formatting"] }
 cursor-icon = "1.1.0"
 dpi.workspace = true
-tracing-tracy = { version = "0.11.3", optional = true }
 wgpu-profiler = { optional = true, version = "0.19.0", default-features = false }
 anymap3 = "1.0.1"
 keyboard-types = "0.7.0"
-oxipng = { version = "9.1.4", default-features = false }
 
 [target.'cfg(target_arch = "wasm32")'.dependencies]
 web-time.workspace = true

masonry/README.md

@@ -100,7 +100,7 @@ fn main() {
 }
 ```
 
-For more information, see [the documentation module](https://docs.rs/masonry/latest/masonry/doc/).
+For more information, see [the documentation module](masonry::doc).
 
 ### Crate feature flags
 

masonry/src/lib.rs

@@ -1,4 +1,4 @@
-// Copyright 2018 the Xilem Authors and the Druid Authors
+// Copyright 2025 the Xilem Authors
 // SPDX-License-Identifier: Apache-2.0
 
 //! Masonry gives you a platform to create windows (using [winit] as a backend) each with a tree of widgets. It also gives you tools to inspect that widget tree at runtime, write unit tests on it, and generally have an easier time debugging and maintaining your app.
@@ -78,7 +78,7 @@
 //! }
 //! ```
 //!
-//! For more information, see [the documentation module](crate::doc).
+//! For more information, see [the documentation module](masonry::doc).
 //!
 //! ### Crate feature flags
 //!
@@ -117,47 +117,15 @@
         reason = "False-positive with dev-dependencies only used in examples"
     )
 )]
-#![expect(clippy::allow_attributes_without_reason, reason = "Deferred: Noisy")]
-// TODO: Remove any items listed as "Deferred"
+#![cfg_attr(
+    not(test),
+    expect(
+        unused_crate_dependencies,
+        reason = "TODO - Remove masonry_core dependencies from masonry_winit"
+    )
+)]
 #![expect(clippy::needless_doctest_main, reason = "Deferred: Noisy")]
-#![expect(clippy::should_implement_trait, reason = "Deferred: Noisy")]
-#![cfg_attr(not(debug_assertions), expect(unused, reason = "Deferred: Noisy"))]
-#![expect(missing_debug_implementations, reason = "Deferred: Noisy")]
-#![expect(clippy::cast_possible_truncation, reason = "Deferred: Noisy")]
-#![expect(clippy::missing_assert_message, reason = "Deferred: Noisy")]
-#![expect(elided_lifetimes_in_paths, reason = "Deferred: Noisy")]
-#![expect(unreachable_pub, reason = "Potentially controversial code style")]
-#![expect(
-    unnameable_types,
-    reason = "Requires lint_reasons rustc feature for exceptions"
-)]
-#![expect(clippy::todo, reason = "We have a lot of 'real' todos")]
-#![expect(
-    clippy::shadow_unrelated,
-    reason = "Potentially controversial code style"
-)]
-#![expect(clippy::single_match, reason = "General policy not decided")]
 
 // TODO - Add logo
 
-#[macro_use]
-pub mod util;
-
-#[cfg(doc)]
-pub mod doc;
-
-mod passes;
-
-pub mod app;
-pub mod core;
-pub mod properties;
-pub mod testing;
-pub mod theme;
-pub mod widgets;
-
-pub use vello::peniko::color::palette;
-pub use vello::{kurbo, peniko};
-pub use {cursor_icon, dpi, parley, vello};
-
-// TODO - Move to core?
-pub use util::{AsAny, Handled, UnitPoint};
+pub use masonry::*;

masonry_core/.gitignore

@@ -0,0 +1,3 @@
+# Visual snapshots
+**/screenshots/*.diff.png
+**/screenshots/*.new.png

masonry_core/Cargo.toml

@@ -0,0 +1,77 @@
+[package]
+name = "masonry"
+version = "0.2.0"
+description = "Traits and types of the Masonry toolkit."
+
+keywords = ["gui", "ui", "toolkit"]
+categories = ["gui", "internationalization", "accessibility"]
+edition.workspace = true
+license.workspace = true
+repository.workspace = true
+homepage.workspace = true
+exclude = ["/doc/", ".gitignore"]
+rust-version.workspace = true
+
+[package.metadata.docs.rs]
+all-features = true
+# There are no platform specific docs.
+default-target = "x86_64-unknown-linux-gnu"
+targets = []
+# rustdoc-scrape-examples tracking issue https://github.com/rust-lang/rust/issues/88791
+cargo-args = ["-Zunstable-options", "-Zrustdoc-scrape-examples"]
+
+[features]
+default = []
+# Enables tracing using tracy if the default Masonry tracing is used.
+# https://github.com/wolfpld/tracy can be connected to when this feature is enabled.
+tracy = [
+    "tracing-tracy/enable",
+    "dep:tracing-tracy",
+    "dep:wgpu-profiler",
+    "wgpu-profiler/tracy",
+    "vello/wgpu-profiler",
+]
+
+[lints]
+workspace = true
+
+[dependencies]
+vello.workspace = true
+wgpu.workspace = true
+parley.workspace = true
+winit.workspace = true
+tree_arena.workspace = true
+smallvec.workspace = true
+tracing = { workspace = true, features = ["default"] }
+image.workspace = true
+once_cell = "1.19.0"
+serde = { version = "1.0.204", features = ["derive"] }
+serde_json = "1.0.120"
+futures-intrusive = "0.5.0"
+pollster = "0.4.0"
+tracing-subscriber = { version = "0.3.18", features = ["env-filter", "time"] }
+accesskit.workspace = true
+accesskit_winit.workspace = true
+time = { workspace = true, features = ["macros", "formatting"] }
+cursor-icon = "1.1.0"
+dpi.workspace = true
+tracing-tracy = { version = "0.11.3", optional = true }
+wgpu-profiler = { optional = true, version = "0.19.0", default-features = false }
+anymap3 = "1.0.1"
+keyboard-types = "0.7.0"
+oxipng = { version = "9.1.4", default-features = false }
+
+[target.'cfg(target_arch = "wasm32")'.dependencies]
+web-time.workspace = true
+
+[dev-dependencies]
+float-cmp = { version = "0.10.0", features = ["std"], default-features = false }
+image = { workspace = true, features = ["png"] }
+insta = { version = "1.39.0" }
+assert_matches = "1.5.0"
+
+# Make wgpu use tracing for its spans.
+profiling = { version = "1.0.15", features = ["profile-with-tracing"] }
+
+[target.'cfg(target_os = "android")'.dependencies]
+tracing_android_trace = "0.1.0"

masonry_core/README.md

@@ -0,0 +1,4 @@
+# `masonry_core`
+
+Traits and types of the Masonry toolkit.
+See Masonry documentation for more details, examples and resources.

masonry_core/resources/fonts/roboto/LICENSE.txt

@@ -0,0 +1,202 @@
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masonry_core/src/lib.rs

@@ -0,0 +1,66 @@
+// Copyright 2018 the Xilem Authors and the Druid Authors
+// SPDX-License-Identifier: Apache-2.0
+
+//! Traits and types of the Masonry toolkit.
+//! See Masonry documentation for more details, examples and resources.
+
+// LINEBENDER LINT SET - lib.rs - v3
+// See https://linebender.org/wiki/canonical-lints/
+// These lints shouldn't apply to examples or tests.
+#![cfg_attr(not(test), warn(unused_crate_dependencies))]
+// These lints shouldn't apply to examples.
+#![warn(clippy::print_stdout, clippy::print_stderr)]
+// Targeting e.g. 32-bit means structs containing usize can give false positives for 64-bit.
+#![cfg_attr(target_pointer_width = "64", warn(clippy::trivially_copy_pass_by_ref))]
+// END LINEBENDER LINT SET
+#![cfg_attr(docsrs, feature(doc_auto_cfg))]
+#![cfg_attr(
+    test,
+    expect(
+        unused_crate_dependencies,
+        reason = "False-positive with dev-dependencies only used in examples"
+    )
+)]
+#![expect(clippy::allow_attributes_without_reason, reason = "Deferred: Noisy")]
+// TODO: Remove any items listed as "Deferred"
+#![expect(clippy::should_implement_trait, reason = "Deferred: Noisy")]
+#![cfg_attr(not(debug_assertions), expect(unused, reason = "Deferred: Noisy"))]
+#![expect(missing_debug_implementations, reason = "Deferred: Noisy")]
+#![expect(clippy::cast_possible_truncation, reason = "Deferred: Noisy")]
+#![expect(clippy::missing_assert_message, reason = "Deferred: Noisy")]
+#![expect(elided_lifetimes_in_paths, reason = "Deferred: Noisy")]
+#![expect(unreachable_pub, reason = "Potentially controversial code style")]
+#![expect(
+    unnameable_types,
+    reason = "Requires lint_reasons rustc feature for exceptions"
+)]
+#![expect(clippy::todo, reason = "We have a lot of 'real' todos")]
+#![expect(
+    clippy::shadow_unrelated,
+    reason = "Potentially controversial code style"
+)]
+#![expect(clippy::single_match, reason = "General policy not decided")]
+
+// TODO - Add logo
+
+#[macro_use]
+pub mod util;
+
+// TODO - re-add #[doc(hidden)]
+pub mod doc;
+
+mod passes;
+
+pub mod app;
+pub mod core;
+pub mod properties;
+pub mod testing;
+pub mod theme;
+pub mod widgets;
+
+pub use vello::peniko::color::palette;
+pub use vello::{kurbo, peniko};
+pub use {cursor_icon, dpi, parley, vello};
+
+// TODO - Move to core?
+pub use util::{AsAny, Handled, UnitPoint};