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Expand stroke: compact plain stroke spines before outlining

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Squashed from #3457 onto main.
This commit is contained in:
bflatastic
2026-10-22 02:21:59 +07:00
parent 19c7d61f8a
commit dd2f5da98c
3 changed files with 104 additions and 0 deletions
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crates/effects/src/stroke/tests.rs
+19
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@@ -127,6 +127,25 @@ fn dot_outlines_take_the_cap_shape_and_wind_like_stroked_dashes() {
assert!(o.contains(Point::new(10.5, 0.0)), "the dot overlapping the dash end is painted");
}
#[test]
fn expand_stroke_region_of_a_round_line_stays_compact() {
use std::f64::consts::PI;
use vectorcraft_geom::{FillRule, PathData, Point, SubPath};
let path = PathData::single(SubPath::polyline(&[Point::new(0.0, 50.0), Point::new(100.0, 50.0)], false));
let st = stroke(10.0, |s| s.cap = vectorcraft_doc::LineCap::Round);
let region = crate::stroke::outline::outline_region(&path, FillRule::NonZero, &st);
let anchors = region.subpaths.iter().map(|s| s.anchors.len()).sum::<usize>();
assert!(anchors <= 8, "expand stroke should use few anchors for a round line, got {anchors}");
let area = region.subpaths.iter().map(|s| s.area()).sum::<f64>().abs();
assert!(near(area, 100.0 * 10.0 + PI * 5.0 * 5.0, 1.0), "{area}");
// Extra colinear anchors along the spine must not multiply outline anchors (#3446).
let dense: Vec<Point> = (0..=20).map(|i| Point::new(i as f64 * 5.0, 50.0)).collect();
let dense_path = PathData::single(SubPath::polyline(&dense, false));
let dense_region = crate::stroke::outline::outline_region(&dense_path, FillRule::NonZero, &st);
let dense_anchors = dense_region.subpaths.iter().map(|s| s.anchors.len()).sum::<usize>();
assert_eq!(dense_anchors, anchors, "colinear spine points should not add outline anchors");
}
#[test]
fn line_outline_uses_the_profile_dashes_or_a_plain_stroke() {
let l = line(0.0, 100.0);