Add path-bool library (#1952)

* Add path-bool library * Cleanup code * Cargo format * Integrate boolean ops into graphite * Add test for editor crash * Fix edge sort floating point instability * Add unit test for red-dress failure * Backport tests and aux functions * Use curvature based sorting * Convert linear cubic splines to line segments * Deduplicate reversed path segments * Fix epsilon for empty segments * Remove parameter based intersection pruning * Add support for reversed paths * Add benchmark infrastructure * Add intersection benchmark * Add recursion bound * Implement support for overlapping path segments * Remove rouge prinln * Fix sorting for bezier segments with one control point at the start of the segment * Cleanup log statements * Directly translate graphite paths to Path segments * Round data before passing it to path_bool * Fix flag_faces traversal order * Add test for white dots in bottom right of painted dreams * Make rounding configurable * Update demo artwork to remove manual path modifications * Convert from path segments to manipulator groups directly * Remove dead code * Fix clippy lints * Replace functions in path segment with methods and add documentation * Add more documentation * Close subpaths * Reorganize files and add README.md * Add license information * Code review * Fix license info * Adopt new node macro and fix demo artwork * Close subpaths with Z --------- Co-authored-by: Keavon Chambers <keavon@keavon.com>
2024-09-21 11:06:43 +02:00 · 2024-09-21 11:06:43 +02:00 · 3eb98c6d6d
parent 2febbfd698
commit 3eb98c6d6d
165 changed files with 5990 additions and 78 deletions
--- a/Cargo.lock
+++ b/Cargo.lock
@ -563,6 +563,12 @@ version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d2c54ff287cfc0a34f38a6b832ea1bd8e448a330b3e40a50859e6488bee07f22"

+[[package]]
+name = "bit_field"
+version = "0.10.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dc827186963e592360843fb5ba4b973e145841266c1357f7180c43526f2e5b61"
+
 [[package]]
 name = "bitflags"
 version = "1.3.2"
@ -1645,6 +1651,22 @@ dependencies = [
 "pin-project-lite",
 ]

+[[package]]
+name = "exr"
+version = "1.72.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "887d93f60543e9a9362ef8a21beedd0a833c5d9610e18c67abe15a5963dcb1a4"
+dependencies = [
+ "bit_field",
+ "flume",
+ "half",
+ "lebe",
+ "miniz_oxide 0.7.4",
+ "rayon-core",
+ "smallvec",
+ "zune-inflate",
+]
+
 [[package]]
 name = "fastnoise-lite"
 version = "1.1.1"
@ -1732,6 +1754,15 @@ dependencies = [
 "bitflags 1.3.2",
 ]

+[[package]]
+name = "flume"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "55ac459de2512911e4b674ce33cf20befaba382d05b62b008afc1c8b57cbf181"
+dependencies = [
+ "spin",
+]
+
 [[package]]
 name = "fnv"
 version = "1.0.7"
@ -2453,6 +2484,7 @@ dependencies = [
 "js-sys",
 "log",
 "node-macro",
+ "path-bool",
 "rand 0.8.5",
 "rand_chacha 0.3.1",
 "reqwest 0.12.7",
@ -3085,7 +3117,13 @@ dependencies = [
 "bytemuck",
 "byteorder",
 "color_quant",
+ "exr",
+ "gif",
+ "jpeg-decoder",
 "num-traits",
+ "png",
+ "qoi",
+ "tiff",
 ]

 [[package]]
@ -3312,6 +3350,9 @@ name = "jpeg-decoder"
 version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f5d4a7da358eff58addd2877a45865158f0d78c911d43a5784ceb7bbf52833b0"
+dependencies = [
+ "rayon",
+]

 [[package]]
 name = "js-sys"
@ -3392,6 +3433,12 @@ version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bbd2bcb4c963f2ddae06a2efc7e9f3591312473c50c6685e1f298068316e66fe"

+[[package]]
+name = "lebe"
+version = "0.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "03087c2bad5e1034e8cace5926dec053fb3790248370865f5117a7d0213354c8"
+
 [[package]]
 name = "libc"
 version = "0.2.158"
@ -4269,6 +4316,20 @@ version = "1.0.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "57c0d7b74b563b49d38dae00a0c37d4d6de9b432382b2892f0574ddcae73fd0a"

+[[package]]
+name = "path-bool"
+version = "0.1.0"
+dependencies = [
+ "criterion",
+ "glam",
+ "glob",
+ "image 0.24.9",
+ "regex",
+ "resvg",
+ "slotmap",
+ "svg",
+]
+
 [[package]]
 name = "pathdiff"
 version = "0.2.1"
@ -4650,6 +4711,15 @@ version = "1.0.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "43d84d1d7a6ac92673717f9f6d1518374ef257669c24ebc5ac25d5033828be58"

+[[package]]
+name = "qoi"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7f6d64c71eb498fe9eae14ce4ec935c555749aef511cca85b5568910d6e48001"
+dependencies = [
+ "bytemuck",
+]
+
 [[package]]
 name = "quick-xml"
 version = "0.31.0"
@ -5844,6 +5914,12 @@ version = "2.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "13c2bddecc57b384dee18652358fb23172facb8a2c51ccc10d74c157bdea3292"

+[[package]]
+name = "svg"
+version = "0.13.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "02d815ad337e8449d2374d4248448645edfe74e699343dd5719139d93fa87112"
+
 [[package]]
 name = "svg_fmt"
 version = "0.4.3"
@ -8274,6 +8350,15 @@ version = "0.4.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3f423a2c17029964870cfaabb1f13dfab7d092a62a29a89264f4d36990ca414a"

+[[package]]
+name = "zune-inflate"
+version = "0.2.54"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "73ab332fe2f6680068f3582b16a24f90ad7096d5d39b974d1c0aff0125116f02"
+dependencies = [
+ "simd-adler32",
+]
+
 [[package]]
 name = "zune-jpeg"
 version = "0.4.13"
--- a/Cargo.toml
+++ b/Cargo.toml
@ -16,6 +16,7 @@ members = [
 	"node-graph/gpu-executor",
 	"node-graph/gpu-compiler/gpu-compiler-bin-wrapper",
 	"libraries/dyn-any",
+	"libraries/path-bool",
 	"libraries/bezier-rs",
 	"libraries/raw-rs",
 	"libraries/raw-rs/tag-derive",
@ -32,6 +33,7 @@ graphene-core = { path = "node-graph/gcore" }
 graph-craft = { path = "node-graph/graph-craft", features = ["serde"] }
 wgpu-executor = { path = "node-graph/wgpu-executor" }
 bezier-rs = { path = "libraries/bezier-rs", features = ["dyn-any"] }
+path-bool = { path = "libraries/path-bool", features = ["parsing"] }
 node-macro = { path = "node-graph/node-macro" }

 # Workspace dependencies
--- a/demo-artwork/painted-dreams.graphite
+++ b/demo-artwork/painted-dreams.graphite
--- a/editor/src/messages/portfolio/document/graph_operation/utility_types.rs
+++ b/editor/src/messages/portfolio/document/graph_operation/utility_types.rs
@ -145,15 +145,15 @@ impl<'a> ModifyInputsContext<'a> {
 	}

 	pub fn insert_vector_data(&mut self, subpaths: Vec<Subpath<PointId>>, layer: LayerNodeIdentifier) {
-		let shape = resolve_document_node_type("Shape")
-			.expect("Shape node does not exist")
+		let path = resolve_document_node_type("Path")
+			.expect("Path node does not exist")
 			.node_template_input_override([Some(NodeInput::value(TaggedValue::Subpaths(subpaths), false))]);
 		let transform = resolve_document_node_type("Transform").expect("Transform node does not exist").default_node_template();
 		let fill = resolve_document_node_type("Fill").expect("Fill node does not exist").default_node_template();
 		let stroke = resolve_document_node_type("Stroke").expect("Stroke node does not exist").default_node_template();

 		let shape_id = NodeId(generate_uuid());
-		self.network_interface.insert_node(shape_id, shape, &[]);
+		self.network_interface.insert_node(shape_id, path, &[]);
 		self.network_interface.move_node_to_chain_start(&shape_id, layer, &[]);

 		let transform_id = NodeId(generate_uuid());
--- a/editor/src/messages/portfolio/document/node_graph/document_node_definitions.rs
+++ b/editor/src/messages/portfolio/document/node_graph/document_node_definitions.rs
@ -2159,12 +2159,13 @@ fn static_nodes() -> Vec<DocumentNodeDefinition> {
 							DocumentNode {
 								inputs: vec![NodeInput::network(concrete!(VectorData), 0), NodeInput::network(concrete!(vector::style::Fill), 1)],
 								implementation: DocumentNodeImplementation::ProtoNode(ProtoNodeIdentifier::new("graphene_std::vector::BooleanOperationNode")),
+								manual_composition: Some(generic!(T)),
 								..Default::default()
 							},
 							DocumentNode {
 								inputs: vec![NodeInput::node(NodeId(0), 0)],
 								implementation: DocumentNodeImplementation::ProtoNode(ProtoNodeIdentifier::new("graphene_core::memo::ImpureMemoNode")),
-								manual_composition: Some(concrete!(Footprint)),
+								manual_composition: Some(generic!(T)),
 								..Default::default()
 							},
 						]
--- a/editor/src/messages/portfolio/document/node_graph/node_properties.rs
+++ b/editor/src/messages/portfolio/document/node_graph/node_properties.rs
@ -2268,17 +2268,10 @@ pub(crate) fn generate_node_properties(document_node: &DocumentNode, node_id: No
 }

 pub(crate) fn boolean_operation_properties(document_node: &DocumentNode, node_id: NodeId, _context: &mut NodePropertiesContext) -> Vec<LayoutGroup> {
-	let group_of_paths_index = 0;
 	let operation_index = 1;
-
-	let mut widgets = start_widgets(document_node, node_id, group_of_paths_index, "Group of Paths", FrontendGraphDataType::Graphic, true);
-
-	widgets.push(Separator::new(SeparatorType::Unrelated).widget_holder());
-	widgets.push(TextLabel::new("The output of a layer stack, which contains all elements to operate on").widget_holder());
-
 	let operation = boolean_operation_radio_buttons(document_node, node_id, operation_index, "Operation", true);

-	vec![LayoutGroup::Row { widgets }, operation]
+	vec![operation]
 }

 pub(crate) fn copy_to_points_properties(document_node: &DocumentNode, node_id: NodeId, _context: &mut NodePropertiesContext) -> Vec<LayoutGroup> {
--- a/libraries/bezier-rs/src/bezier/core.rs
+++ b/libraries/bezier-rs/src/bezier/core.rs
@ -113,16 +113,9 @@ impl Bezier {

 	/// Return the string argument used to create a curve in an SVG `path`, excluding the start point.
 	pub fn svg_curve_argument(&self) -> String {
-		let handle_args = match self.handles {
-			BezierHandles::Linear => SVG_ARG_LINEAR.to_string(),
-			BezierHandles::Quadratic { handle } => {
-				format!("{SVG_ARG_QUADRATIC}{} {}", handle.x, handle.y)
-			}
-			BezierHandles::Cubic { handle_start, handle_end } => {
-				format!("{SVG_ARG_CUBIC}{} {} {} {}", handle_start.x, handle_start.y, handle_end.x, handle_end.y)
-			}
-		};
-		format!("{handle_args} {} {}", self.end.x, self.end.y)
+		let mut out = String::new();
+		self.write_curve_argument(&mut out).unwrap();
+		out
 	}

 	/// Write the curve argument to the string
--- a/libraries/path-bool/.gitignore
+++ b/libraries/path-bool/.gitignore
@ -0,0 +1,2 @@
+/target
+test-results
--- a/libraries/path-bool/Cargo.toml
+++ b/libraries/path-bool/Cargo.toml
@ -0,0 +1,38 @@
+[package]
+name = "path-bool"
+version = "0.1.0"
+rust-version = "1.81"
+authors = ["Graphite Authors <contact@graphite.rs>"]
+edition = "2021"
+keywords = ["bezier", "boolean", "path", "ops", "operations", "2d"]
+categories = ["graphics", "mathematics"]
+license = "MIT OR Apache-2.0"
+
+
+[features]
+logging = ["parsing"]
+parsing = []
+default = ["parsing"]
+
+[dependencies]
+glam = "0.28.0"
+regex = "1.10.6"
+slotmap = "1.0.7"
+
+[dev-dependencies]
+glob = "0.3"
+svg = "0.13"
+resvg = "0.42"
+image = "0.24"
+
+# Required dependencies
+criterion = { version = "0.5", features = ["html_reports"]}
+
+# Benchmarks
+[[bench]]
+name = "painted_dreams"
+harness = false
+
+[[bench]]
+name = "path_segment_intersection"
+harness = false
--- a/libraries/path-bool/LICENSE-APACHE
+++ b/libraries/path-bool/LICENSE-APACHE
@ -0,0 +1,201 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
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--- a/libraries/path-bool/LICENSE-MIT
+++ b/libraries/path-bool/LICENSE-MIT
@ -0,0 +1,10 @@
+MIT License
+
+Copyright (c) 2024 Adam Platkevič
+Copyright (c) 2024 Graphite Authors
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice (including the next paragraph) shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
--- a/libraries/path-bool/NOTICE
+++ b/libraries/path-bool/NOTICE
@ -0,0 +1,6 @@
+NOTICE
+
+This project includes software originally developed by Adam Platkevič.
+The original project is licensed under the MIT License.
+
+Rust port and modifications are (c) 2024 Graphite Authors.
--- a/libraries/path-bool/README.md
+++ b/libraries/path-bool/README.md
@ -0,0 +1,68 @@
+# Path Bool
+
+A Rust library for performing boolean operations on SVG paths.
+
+Path Bool is a port of [PathBool.js](https://github.com/r-flash/PathBool.js), providing low-level functionality for boolean operations on complex 2D paths. It handles paths with multiple subpaths, self-intersections, and different fill rules.
+
+## Features
+
+- Supports multiple boolean operations: Union, Intersection, Difference, Exclusion, Division, and Fracture.
+- Handles both `NonZero` and `EvenOdd` fill rules.
+- Works with paths containing lines, cubic Bézier curves, quadratic Bézier curves, and elliptical arcs.
+- Provides utilities for parsing and generating SVG path data.
+
+## Installation
+
+Add this to your `Cargo.toml`:
+
+```toml
+[dependencies]
+path-bool = "0.1.0"
+```
+
+## Usage
+
+Here's a basic example of performing an intersection operation on two paths:
+
+```rust
+use path_bool::{path_boolean, FillRule, PathBooleanOperation, path_from_path_data, path_to_path_data};
+
+fn main() {
+    let path_a = path_from_path_data("M 10 10 L 50 10 L 30 40 Z");
+    let path_b = path_from_path_data("M 20 30 L 60 30 L 60 50 L 20 50 Z");
+
+    let result = path_boolean(
+        &path_a,
+        FillRule::NonZero,
+        &path_b,
+        FillRule::NonZero,
+        PathBooleanOperation::Intersection
+    ).unwrap();
+
+    let result_data = path_to_path_data(&result[0], 0.001);
+    println!("Result: {}", result_data);
+}
+```
+
+## Algorithm
+
+The boolean operations are implemented using a graph-based approach. After the parsing the input, self-intersecting cubic beziers curves are simplified. Then the intersection points between all edges are calculated. These are then turned into a graph representation where every intersection becomes a new vertex. We then apply edge contractions to remove vertices with a degree of 2 to compute the [graph minor](https://en.wikipedia.org/wiki/Graph_minor). At this stage, identical edges are deduplicated. Because we are ultimately interested in the faces of the graph to decide if they should be included in the final output, we then compute the dual graph in which the faces become vertices and vertices become the new faces. That dual structure is then used to determine which faces (dual vertices) should be included in the final output.
+
+## Development status
+
+This project is a port of PathBool.js and is still in early stages of development. Contributions, bug reports, and feedback are welcome.
+
+Future work includes:
+
+- Comprehensive test suite
+- Performance optimizations
+- Additional examples and documentation
+
+## License and acknowledgements
+
+This library is a Rust port of [PathBool.js](https://github.com/r-flash/PathBool.js) by Adam Platkevič.
+
+It is dual-licensed under the MIT License or Apache-2.0 License. You may opt to comply with either license.
+
+Copyright © 2024 Adam Platkevič
+Copyright © 2024 Graphite Authors
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+<svg width="48" height="48" viewBox="0 0 48 48" version="1.1" id="svg1" xmlns="http://www.w3.org/2000/svg">
+    <path style="fill:#ff0000;stroke:#000000;stroke-width:1.99937;stroke-linecap:round;stroke-linejoin:round" d="M 26.811783335962,37.120515321746 A 8.683698700000 8.683698700000 0.000000000000 0 0 30.189140000000,37.804209000000 A 8.683698700000 8.683698700000 0.000000000000 0 0 38.872839000000,29.120510000000 A 8.683698700000 8.683698700000 0.000000000000 0 0 34.638239102979,21.663154743066 A 8.683698700000 8.683698700000 0.000000000000 0 0 30.189140000000,20.436811000000 A 8.683698700000 8.683698700000 0.000000000000 0 0 27.251230394932,20.948893816238 A 12.347054000000 12.347054000000 0.000000000000 0 0 17.706438000000,16.434252000000 A 12.347054000000 12.347054000000 0.000000000000 0 0 5.359384500000,28.781305000000 A 12.347054000000 12.347054000000 0.000000000000 0 0 17.706438000000,41.128359000000 A 12.347054000000 12.347054000000 0.000000000000 0 0 26.811783336064,37.120515321723"/>
+    
+</svg>
--- a/libraries/path-bool/fixtures/visual-tests/dangling-03/difference.svg
+++ b/libraries/path-bool/fixtures/visual-tests/dangling-03/difference.svg
@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg width="48" height="48" viewBox="0 0 48 48" version="1.1" id="svg1" xmlns="http://www.w3.org/2000/svg">
+    <path style="fill:#ff0000;stroke:#000000;stroke-width:1.99937;stroke-linecap:round;stroke-linejoin:round" d=""/>
+    
+</svg>
--- a/libraries/path-bool/fixtures/visual-tests/dangling-03/division.svg
+++ b/libraries/path-bool/fixtures/visual-tests/dangling-03/division.svg
@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg width="48" height="48" viewBox="0 0 48 48" version="1.1" id="svg1" xmlns="http://www.w3.org/2000/svg">
+    
+    
+</svg>
--- a/libraries/path-bool/fixtures/visual-tests/dangling-03/exclusion.svg
+++ b/libraries/path-bool/fixtures/visual-tests/dangling-03/exclusion.svg
@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg width="48" height="48" viewBox="0 0 48 48" version="1.1" id="svg1" xmlns="http://www.w3.org/2000/svg">
+    <path style="fill:#ff0000;stroke:#000000;stroke-width:1.99937;stroke-linecap:round;stroke-linejoin:round" d=""/>
+    
+</svg>
--- a/libraries/path-bool/fixtures/visual-tests/dangling-03/fracture.svg
+++ b/libraries/path-bool/fixtures/visual-tests/dangling-03/fracture.svg
@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg width="48" height="48" viewBox="0 0 48 48" version="1.1" id="svg1" xmlns="http://www.w3.org/2000/svg">
+    
+    
+</svg>
--- a/libraries/path-bool/fixtures/visual-tests/dangling-03/intersection.svg
+++ b/libraries/path-bool/fixtures/visual-tests/dangling-03/intersection.svg
@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg width="48" height="48" viewBox="0 0 48 48" version="1.1" id="svg1" xmlns="http://www.w3.org/2000/svg">
+    <path style="fill:#ff0000;stroke:#000000;stroke-width:1.99937;stroke-linecap:round;stroke-linejoin:round" d=""/>
+    
+</svg>
--- a/libraries/path-bool/fixtures/visual-tests/dangling-03/original.svg
+++ b/libraries/path-bool/fixtures/visual-tests/dangling-03/original.svg
@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg width="48"
+     height="48"
+     viewBox="0 0 48 48"
+     version="1.1"
+     id="svg1"
+     xmlns="http://www.w3.org/2000/svg">
+    <path style="fill:#ff0000;stroke:#000000;stroke-width:1.99937;stroke-linecap:round;stroke-linejoin:round"
+          d="M 7.5980087,6.9364914 C 18.588406,7.9541084 22.115946,15.280819 21.098329,20.776017 c -1.017617,5.495199 -1.899419,10.583615 2.171049,14.179063 4.070468,3.595448 2.103141,10.040025 -14.2466391,8.886924"
+          id="a"/>
+    <path style="fill:#ff0000;stroke:#000000;stroke-width:1.99937;stroke-linecap:round;stroke-linejoin:round"
+          d="m 32.835045,8.3612215 c 0,0 -17.028192,1.6281211 -17.0961,10.1082635 -0.06791,8.480142 10.379893,5.2239 10.990397,8.276751 0.610504,3.052851 -9.362276,7.530433 -8.887255,10.515377 0.47502,2.984943 6.580391,13.364505 20.555732,3.52754"
+          id="b"/>
+</svg>
--- a/libraries/path-bool/fixtures/visual-tests/dangling-03/union.svg
+++ b/libraries/path-bool/fixtures/visual-tests/dangling-03/union.svg
@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg width="48" height="48" viewBox="0 0 48 48" version="1.1" id="svg1" xmlns="http://www.w3.org/2000/svg">
+    <path style="fill:#ff0000;stroke:#000000;stroke-width:1.99937;stroke-linecap:round;stroke-linejoin:round" d=""/>
+    
+</svg>
--- a/libraries/path-bool/fixtures/visual-tests/dangling-04/difference.svg
+++ b/libraries/path-bool/fixtures/visual-tests/dangling-04/difference.svg
@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg width="48" height="48" viewBox="0 0 48 48" version="1.1" id="svg1" xmlns="http://www.w3.org/2000/svg">
+    <path style="fill:#ff0000;stroke:#000000;stroke-width:2;stroke-linecap:round;stroke-linejoin:round" d="M 24.477098604512,9.669417777521 C 14.819439929541,11.947535742517 12.676649436509,16.038615428837 14.333890728881,19.259441941784 A 14.414713000000 14.414713000000 0.000000000000 0 1 24.000000000000,15.538198000000 A 14.414713000000 14.414713000000 0.000000000000 0 1 33.122169882593,18.791819319278 C 34.069717470896,15.767492825406 31.940527089963,12.079149310707 24.477098604560,9.669417777522"/>
+    
+</svg>
--- a/libraries/path-bool/fixtures/visual-tests/dangling-04/division.svg
+++ b/libraries/path-bool/fixtures/visual-tests/dangling-04/division.svg
@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg width="48" height="48" viewBox="0 0 48 48" version="1.1" id="svg1" xmlns="http://www.w3.org/2000/svg">
+    <path style="fill:#ff0000;stroke:#000000;stroke-width:2;stroke-linecap:round;stroke-linejoin:round" d="M 24.477098604512,9.669417777521 C 14.819439929541,11.947535742517 12.676649436509,16.038615428837 14.333890728881,19.259441941784 A 14.414713000000 14.414713000000 0.000000000000 0 1 24.000000000000,15.538198000000 A 14.414713000000 14.414713000000 0.000000000000 0 1 33.122169882593,18.791819319278 C 34.069717470896,15.767492825406 31.940527089963,12.079149310707 24.477098604560,9.669417777522"/><path style="fill:#ff0000;stroke:#000000;stroke-width:2;stroke-linecap:round;stroke-linejoin:round" d="M 33.122169882593,18.791819319278 A 14.414713000000 14.414713000000 0.000000000000 0 0 24.000000000000,15.538198000000 A 14.414713000000 14.414713000000 0.000000000000 0 0 14.333890728979,19.259441941746 C 15.689970608910,21.894965236658 19.590455736640,23.947789000000 24.000000000000,23.947789000000 C 28.530465205736,23.947789000000 32.220212847621,21.670632574670 33.122169882598,18.791819319326"/>
+    
+</svg>
--- a/libraries/path-bool/fixtures/visual-tests/dangling-04/exclusion.svg
+++ b/libraries/path-bool/fixtures/visual-tests/dangling-04/exclusion.svg
@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg width="48" height="48" viewBox="0 0 48 48" version="1.1" id="svg1" xmlns="http://www.w3.org/2000/svg">
+    <path style="fill:#ff0000;stroke:#000000;stroke-width:2;stroke-linecap:round;stroke-linejoin:round" d="M 24.477098604512,9.669417777521 C 14.819439929541,11.947535742517 12.676649436509,16.038615428837 14.333890728881,19.259441941784 A 14.414713000000 14.414713000000 0.000000000000 0 1 24.000000000000,15.538198000000 A 14.414713000000 14.414713000000 0.000000000000 0 1 33.122169882593,18.791819319278 C 34.069717470896,15.767492825406 31.940527089963,12.079149310707 24.477098604560,9.669417777522 M 33.122169882598,18.791819319326 C 32.220212847621,21.670632574670 28.530465205736,23.947789000000 24.000000000000,23.947789000000 C 19.590455736640,23.947789000000 15.689970608910,21.894965236658 14.333890728881,19.259441941784 A 14.414713000000 14.414713000000 0.000000000000 0 0 9.585287100000,29.952911000000 A 14.414713000000 14.414713000000 0.000000000000 0 0 24.000000000000,44.367624000000 A 14.414713000000 14.414713000000 0.000000000000 0 0 38.414713000000,29.952911000000 A 14.414713000000 14.414713000000 0.000000000000 0 0 33.122169882593,18.791819319278"/>
+    
+</svg>
--- a/libraries/path-bool/fixtures/visual-tests/dangling-04/fracture.svg
+++ b/libraries/path-bool/fixtures/visual-tests/dangling-04/fracture.svg
@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg width="48" height="48" viewBox="0 0 48 48" version="1.1" id="svg1" xmlns="http://www.w3.org/2000/svg">
+    <path style="fill:#ff0000;stroke:#000000;stroke-width:2;stroke-linecap:round;stroke-linejoin:round" d="M 24.477098604512,9.669417777521 C 14.819439929541,11.947535742517 12.676649436509,16.038615428837 14.333890728881,19.259441941784 A 14.414713000000 14.414713000000 0.000000000000 0 1 24.000000000000,15.538198000000 A 14.414713000000 14.414713000000 0.000000000000 0 1 33.122169882593,18.791819319278 C 34.069717470896,15.767492825406 31.940527089963,12.079149310707 24.477098604560,9.669417777522"/><path style="fill:#ff0000;stroke:#000000;stroke-width:2;stroke-linecap:round;stroke-linejoin:round" d="M 33.122169882598,18.791819319326 C 32.220212847621,21.670632574670 28.530465205736,23.947789000000 24.000000000000,23.947789000000 C 19.590455736640,23.947789000000 15.689970608910,21.894965236658 14.333890728881,19.259441941784 A 14.414713000000 14.414713000000 0.000000000000 0 0 9.585287100000,29.952911000000 A 14.414713000000 14.414713000000 0.000000000000 0 0 24.000000000000,44.367624000000 A 14.414713000000 14.414713000000 0.000000000000 0 0 38.414713000000,29.952911000000 A 14.414713000000 14.414713000000 0.000000000000 0 0 33.122169882593,18.791819319278"/><path style="fill:#ff0000;stroke:#000000;stroke-width:2;stroke-linecap:round;stroke-linejoin:round" d="M 33.122169882593,18.791819319278 A 14.414713000000 14.414713000000 0.000000000000 0 0 24.000000000000,15.538198000000 A 14.414713000000 14.414713000000 0.000000000000 0 0 14.333890728979,19.259441941746 C 15.689970608910,21.894965236658 19.590455736640,23.947789000000 24.000000000000,23.947789000000 C 28.530465205736,23.947789000000 32.220212847621,21.670632574670 33.122169882598,18.791819319326"/>
+    
+</svg>
--- a/libraries/path-bool/fixtures/visual-tests/dangling-04/intersection.svg
+++ b/libraries/path-bool/fixtures/visual-tests/dangling-04/intersection.svg
@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg width="48" height="48" viewBox="0 0 48 48" version="1.1" id="svg1" xmlns="http://www.w3.org/2000/svg">
+    <path style="fill:#ff0000;stroke:#000000;stroke-width:2;stroke-linecap:round;stroke-linejoin:round" d="M 33.122169882593,18.791819319278 A 14.414713000000 14.414713000000 0.000000000000 0 0 24.000000000000,15.538198000000 A 14.414713000000 14.414713000000 0.000000000000 0 0 14.333890728979,19.259441941746 C 15.689970608910,21.894965236658 19.590455736640,23.947789000000 24.000000000000,23.947789000000 C 28.530465205736,23.947789000000 32.220212847621,21.670632574670 33.122169882598,18.791819319326"/>
+    
+</svg>
--- a/libraries/path-bool/fixtures/visual-tests/dangling-04/original.svg
+++ b/libraries/path-bool/fixtures/visual-tests/dangling-04/original.svg
@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg width="48"
+     height="48"
+     viewBox="0 0 48 48"
+     version="1.1"
+     id="svg1"
+     xmlns="http://www.w3.org/2000/svg">
+    <path style="fill:#ff0000;stroke:#000000;stroke-width:2;stroke-linecap:round;stroke-linejoin:round"
+          d="M 3.2052288,7.1229882 C 42.417605,7.1229882 36.314629,23.947789 24,23.947789 11.685371,23.947789 3.3410435,7.9372144 43.299408,7.9372144"
+          id="a"/>
+    <path id="b"
+          style="fill:#ff0000;stroke:#000000;stroke-width:2;stroke-linecap:round;stroke-linejoin:round"
+          d="M 38.414713,29.952911 A 14.414713,14.414713 0 0 1 24,44.367624 14.414713,14.414713 0 0 1 9.5852871,29.952911 14.414713,14.414713 0 0 1 24,15.538198 14.414713,14.414713 0 0 1 38.414713,29.952911 Z"/>
+</svg>
--- a/libraries/path-bool/fixtures/visual-tests/dangling-04/union.svg
+++ b/libraries/path-bool/fixtures/visual-tests/dangling-04/union.svg
@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg width="48" height="48" viewBox="0 0 48 48" version="1.1" id="svg1" xmlns="http://www.w3.org/2000/svg">
+    <path style="fill:#ff0000;stroke:#000000;stroke-width:2;stroke-linecap:round;stroke-linejoin:round" d="M 24.477098604512,9.669417777521 C 14.819439929541,11.947535742517 12.676649436509,16.038615428837 14.333890728881,19.259441941784 A 14.414713000000 14.414713000000 0.000000000000 0 0 9.585287100000,29.952911000000 A 14.414713000000 14.414713000000 0.000000000000 0 0 24.000000000000,44.367624000000 A 14.414713000000 14.414713000000 0.000000000000 0 0 38.414713000000,29.952911000000 A 14.414713000000 14.414713000000 0.000000000000 0 0 33.122169882593,18.791819319278 C 34.069717470896,15.767492825406 31.940527089963,12.079149310707 24.477098604560,9.669417777522"/>
+    
+</svg>
--- a/libraries/path-bool/fixtures/visual-tests/establish-ground-truth.sh
+++ b/libraries/path-bool/fixtures/visual-tests/establish-ground-truth.sh
@ -0,0 +1,5 @@
+for dir in */; do
+    for fn in difference division exclusion fracture intersection union; do
+        cp "${dir}test-results/$fn-ours.svg" "$dir$fn.svg"
+    done
+done
--- a/libraries/path-bool/fixtures/visual-tests/generate-ground-truth.sh
+++ b/libraries/path-bool/fixtures/visual-tests/generate-ground-truth.sh
@ -0,0 +1,10 @@
+INKSCAPE_CMD=inkscape
+OPS=(union difference intersection exclusion division fracture)
+
+for dir in */; do
+  for op in "${OPS[@]}"; do
+    if [ ! -e "$dir/$op.svg" ]; then
+      $INKSCAPE_CMD --actions="select-all; path-$op; export-filename:$dir/$op.svg; export-plain-svg; export-do; file-close" "$dir/original.svg"
+    fi
+  done
+done
--- a/libraries/path-bool/fixtures/visual-tests/nesting-01/difference.svg
+++ b/libraries/path-bool/fixtures/visual-tests/nesting-01/difference.svg
@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg width="48" height="48" viewBox="0 0 48 48" version="1.1" id="svg1" xmlns="http://www.w3.org/2000/svg">
+    <defs id="defs1"/>
+    <g id="layer1">
+        <path style="fill:#ff0000;stroke:#000000;stroke-width:2;stroke-linecap:round;stroke-linejoin:round" d="M 47.000000000000,24.000000000000 A 23.000000000000 23.000000000000 0.000000000000 0 0 24.000000000000,1.000000000000 A 23.000000000000 23.000000000000 0.000000000000 0 0 1.000000000000,24.000000000000 A 23.000000000000 23.000000000000 0.000000000000 0 0 24.000000000000,47.000000000000 A 23.000000000000 23.000000000000 0.000000000000 0 0 47.000000000000,24.000000000000 M 37.909023000000,24.000000000000 A 13.909023000000 13.909023000000 0.000000000000 0 1 24.000000000000,37.909023000000 A 13.909023000000 13.909023000000 0.000000000000 0 1 10.090978000000,24.000000000000 A 13.909023000000 13.909023000000 0.000000000000 0 1 24.000000000000,10.090978000000 A 13.909023000000 13.909023000000 0.000000000000 0 1 37.909023000000,24.000000000000"/>
+        
+    </g>
+</svg>
--- a/libraries/path-bool/fixtures/visual-tests/nesting-01/division.svg
+++ b/libraries/path-bool/fixtures/visual-tests/nesting-01/division.svg
@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg width="48" height="48" viewBox="0 0 48 48" version="1.1" id="svg1" xmlns="http://www.w3.org/2000/svg">
+    <defs id="defs1"/>
+    <g id="layer1">
+        <path style="fill:#ff0000;stroke:#000000;stroke-width:2;stroke-linecap:round;stroke-linejoin:round" d="M 47.000000000000,24.000000000000 A 23.000000000000 23.000000000000 0.000000000000 0 0 24.000000000000,1.000000000000 A 23.000000000000 23.000000000000 0.000000000000 0 0 1.000000000000,24.000000000000 A 23.000000000000 23.000000000000 0.000000000000 0 0 24.000000000000,47.000000000000 A 23.000000000000 23.000000000000 0.000000000000 0 0 47.000000000000,24.000000000000 M 37.909023000000,24.000000000000 A 13.909023000000 13.909023000000 0.000000000000 0 1 24.000000000000,37.909023000000 A 13.909023000000 13.909023000000 0.000000000000 0 1 10.090978000000,24.000000000000 A 13.909023000000 13.909023000000 0.000000000000 0 1 24.000000000000,10.090978000000 A 13.909023000000 13.909023000000 0.000000000000 0 1 37.909023000000,24.000000000000"/><path style="fill:#ff0000;stroke:#000000;stroke-width:2;stroke-linecap:round;stroke-linejoin:round" d="M 37.909023000000,24.000000000000 A 13.909023000000 13.909023000000 0.000000000000 0 0 24.000000000000,10.090978000000 A 13.909023000000 13.909023000000 0.000000000000 0 0 10.090978000000,24.000000000000 A 13.909023000000 13.909023000000 0.000000000000 0 0 24.000000000000,37.909023000000 A 13.909023000000 13.909023000000 0.000000000000 0 0 37.909023000000,24.000000000000"/>
+        
+    </g>
+</svg>
--- a/libraries/path-bool/fixtures/visual-tests/nesting-01/exclusion.svg
+++ b/libraries/path-bool/fixtures/visual-tests/nesting-01/exclusion.svg
@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg width="48" height="48" viewBox="0 0 48 48" version="1.1" id="svg1" xmlns="http://www.w3.org/2000/svg">
+    <defs id="defs1"/>
+    <g id="layer1">
+        <path style="fill:#ff0000;stroke:#000000;stroke-width:2;stroke-linecap:round;stroke-linejoin:round" d="M 47.000000000000,24.000000000000 A 23.000000000000 23.000000000000 0.000000000000 0 0 24.000000000000,1.000000000000 A 23.000000000000 23.000000000000 0.000000000000 0 0 1.000000000000,24.000000000000 A 23.000000000000 23.000000000000 0.000000000000 0 0 24.000000000000,47.000000000000 A 23.000000000000 23.000000000000 0.000000000000 0 0 47.000000000000,24.000000000000 M 37.909023000000,24.000000000000 A 13.909023000000 13.909023000000 0.000000000000 0 1 24.000000000000,37.909023000000 A 13.909023000000 13.909023000000 0.000000000000 0 1 10.090978000000,24.000000000000 A 13.909023000000 13.909023000000 0.000000000000 0 1 24.000000000000,10.090978000000 A 13.909023000000 13.909023000000 0.000000000000 0 1 37.909023000000,24.000000000000"/>
+        
+    </g>
+</svg>
--- a/libraries/path-bool/fixtures/visual-tests/nesting-01/fracture.svg
+++ b/libraries/path-bool/fixtures/visual-tests/nesting-01/fracture.svg
@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg width="48" height="48" viewBox="0 0 48 48" version="1.1" id="svg1" xmlns="http://www.w3.org/2000/svg">
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