M6: .fig export writes vector region paints (#2302)

Each vector region with paints of its own (an empty list included) now names an entry of the network's style table, so the paints come back on import; equal lists share one entry and a region without paints writes style 0. Only the paint frame of a region, which the importer cannot read, still warns.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Model-Effort: Opus 5.5 drove; Fable 5.2 briefed; Sonnet 5.5 wrote at medium

crates/format/src/fig/export/shape.rs

@@ -170,8 +170,8 @@ impl<'d> Exporter<'d> {
     /// The editable network (with per-point corner radii, handle mirroring and end caps) and,
     /// when it has filled areas, their outline.
     pub(super) fn vector(&mut self, n: &Node, net: &VectorNetwork, f: &mut Fields) {
-        if net.regions.iter().any(|region| region.fills.is_some() || region.paint_space.is_some()) {
-            self.warn("vector region paints were left out of the .fig export");
+        if net.regions.iter().any(|region| region.paint_space.is_some()) {
+            self.warn("vector region paint frames were left out (their gradients and images follow the layer's box)");
         }
         let entries: usize = net.regions.iter().flat_map(|r| &r.loops).map(Vec::len).sum();
         if net.vertices.len() + net.segments.len() + entries > MAX_NETWORK {
@@ -249,11 +249,19 @@ impl<'d> Exporter<'d> {
                     tb: (finite(sg.tb.0), finite(sg.tb.1)),
                 })
                 .collect();
-            let regions = net
-                .regions
-                .iter()
-                .map(|r| network::Region { style: 0, non_zero: r.winding == WindingRule::NonZero, loops: r.loops.clone() })
-                .collect();
+            // A region with paints of its own (an empty list included) names a style entry that
+            // holds them; one without writes style 0 and shows the layer's fills.
+            let mut regions = Vec::with_capacity(net.regions.len());
+            for r in &net.regions {
+                let style = match &r.fills {
+                    Some(paints) => {
+                        let list = self.paints(paints, true, &Bound::default());
+                        style_of(vec![("fillPaints", list)])
+                    }
+                    None => 0,
+                };
+                regions.push(network::Region { style, non_zero: r.winding == WindingRule::NonZero, loops: r.loops.clone() });
+            }
             let blob = network::encode(&network::Network { vertices, segments, regions });
             let table = styles.into_iter().zip(1u32..).map(|(mut st, id)| {
                 st.insert(0, ("styleID", u(id)));

crates/format/src/fig/export_tests.rs

@@ -843,21 +843,38 @@ fn round_trip_keeps_the_details() {
 }
 
 #[test]
-fn fig_export_warns_when_region_paints_are_left_out() {
-    let mut doc = generate(3);
-    let Some(id) = doc.nodes().find_map(|node| match &node.kind {
-        NodeKind::Vector { network } if !network.regions.is_empty() => Some(node.id),
-        _ => None,
-    }) else {
-        panic!("generated document has no filled vector");
-    };
-    let node = doc.node_mut(id).unwrap();
-    let NodeKind::Vector { network } = &mut node.kind else { panic!("expected vector fixture") };
-    let region = network.regions.first_mut().unwrap();
-    region.fills = Some(Vec::new());
+fn vector_region_paints_round_trip() {
+    let square = [(0.0, 0.0), (100.0, 0.0), (100.0, 100.0), (0.0, 100.0)].map(|(x, y)| Point::new(x, y));
+    let mut doc = Document::new("regions");
+    let page = doc.first_page().unwrap();
+    let mut two = VectorNetwork::from_points(&square, true);
+    let again = two.regions[0].clone();
+    two.regions.push(again);
+    let mut half = Paint::solid(Color { r: 0.25, g: 0.5, b: 0.75, a: 1.0 });
+    half.opacity = 0.5;
+    let gradient = Paint::gradient(Gradient::default_for(GradientKind::Linear, Color { r: 1.0, g: 0.0, b: 0.0, a: 1.0 }));
+    two.regions[0].fills = Some(vec![half, gradient]);
+    two.regions[1].fills = Some(Vec::new());
+    let id = doc.create(page, NodeKind::Vector { network: two }, "Painted", 0.0, 0.0, 100.0, 100.0).unwrap();
+    doc.node_mut(id).unwrap().fills = vec![Paint::solid(Color::BLACK)];
+    let inherit = VectorNetwork::from_points(&square, true);
+    let id2 = doc.create(page, NodeKind::Vector { network: inherit }, "Inherits", 0.0, 0.0, 100.0, 100.0).unwrap();
+    doc.node_mut(id2).unwrap().fills = vec![Paint::solid(Color::BLACK)];
 
-    let (_, warnings) = export(&doc, None).unwrap();
-    assert!(warnings.iter().any(|warning| warning == "vector region paints were left out of the .fig export"), "{warnings:?}");
+    let (back, warnings) = round_trip(&doc, "region paints");
+    assert!(!warnings.iter().any(|w| w.contains("region")), "{warnings:?}");
+    let regions_of = |d: &Document, name: &str| match d.nodes().find(|n| n.name == name).map(|n| &n.kind) {
+        Some(NodeKind::Vector { network }) => network.regions.clone(),
+        k => panic!("{name}: {k:?}"),
+    };
+    let painted = regions_of(&back, "Painted");
+    assert_eq!(painted.len(), 2);
+    let fills = painted[0].fills.as_ref().expect("the first region keeps its paints");
+    assert_eq!(fills.len(), 2);
+    assert!(matches!(&fills[0].kind, PaintKind::Solid { .. }) && (fills[0].opacity - 0.5).abs() < 1e-6);
+    assert!(matches!(&fills[1].kind, PaintKind::Gradient(_)));
+    assert_eq!(painted[1].fills, Some(Vec::new()), "an unfilled region stays unfilled");
+    assert_eq!(regions_of(&back, "Inherits")[0].fills, None, "a region with no paints of its own still shows the layer's");
 }
 
 #[test]
@@ -875,16 +892,18 @@ fn fig_export_warns_when_inherited_region_paints_have_a_paint_frame() {
     let region = network.regions.first_mut().unwrap();
     region.fills = None;
     region.paint_space = Some(RegionPaintSpace { width: 20.0, height: 10.0, transform: Affine::translate((4.0, 8.0)) });
+    let text = "vector region paint frames were left out (their gradients and images follow the layer's box)";
 
     let (_, warnings) = export(&doc, None).unwrap();
-    assert!(warnings.iter().any(|warning| warning == "vector region paints were left out of the .fig export"), "{warnings:?}");
+    assert!(warnings.iter().any(|warning| warning == text), "{warnings:?}");
 
     let mut plain = doc;
     let node = plain.node_mut(id).unwrap();
     let NodeKind::Vector { network } = &mut node.kind else { panic!("expected vector fixture") };
     network.regions[0].paint_space = None;
+    network.regions[0].fills = Some(vec![Paint::solid(Color::BLACK)]);
     let (_, warnings) = export(&plain, None).unwrap();
-    assert!(!warnings.iter().any(|warning| warning == "vector region paints were left out of the .fig export"), "{warnings:?}");
+    assert!(!warnings.iter().any(|warning| warning.contains("region paint")), "{warnings:?}");
 }
 
 #[test]

crates/format/src/fig/tail_tests.rs

@@ -359,6 +359,28 @@ fn vector_region_missing_and_empty_paints_remain_distinct() {
     assert_eq!(network_of(&empty, "Wave").regions[0].fills, Some(Vec::new()));
 }
 
+#[test]
+fn vector_region_fills_survive_a_fig_export() {
+    let solid = o(vec![("type", e("SOLID")), ("color", o(vec![("r", f(0.2)), ("g", f(0.4)), ("b", f(0.8)), ("a", f(1.0))])), ("opacity", f(0.5))]);
+    let gradient = o(vec![
+        ("type", e("GRADIENT_LINEAR")),
+        (
+            "stops",
+            arr(vec![
+                o(vec![("position", f(0.0)), ("color", o(vec![("r", f(1.0)), ("g", f(0.0)), ("b", f(0.0)), ("a", f(1.0))]))]),
+                o(vec![("position", f(1.0)), ("color", o(vec![("r", f(0.0)), ("g", f(0.0)), ("b", f(1.0)), ("a", f(1.0))]))]),
+            ]),
+        ),
+    ]);
+    let (doc, _) = import(&region_canvas(Some(vec![solid, gradient]), 1), "Region fills").unwrap();
+    let first = network_of(&doc, "Wave").regions[0].fills.clone();
+    assert!(first.as_ref().is_some_and(|fills| fills.len() == 2), "{first:?}");
+    let (bytes, warnings) = crate::fig::export::export(&doc, None).unwrap();
+    assert!(!warnings.iter().any(|warning| warning.contains("region paints")), "{warnings:?}");
+    let (back, _) = import(&bytes, "Again").unwrap();
+    assert_eq!(network_of(&back, "Wave").regions[0].fills, first);
+}
+
 #[test]
 fn vector_region_linked_fill_uses_style_paints_without_recording_definition() {
     let linked = solid(0.9, 0.1, 0.2);

docs/file-format-parity.md

@@ -1,6 +1,6 @@
 # File format parity
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-11-10 · **Change:** minor (`.fig` import and export read and write a boolean group's corner radius and smoothing (#2222); `.jam` import: stickies come in as native board stickies (#1808); `.fig` import scales per-point vector corner radii with the row that supplies their network and keeps different instance scales separate in the network cache (#2097); `.fig` export preserves scaled-instance lengths reset to their unscaled main values, including nested linked-style overrides (#2097); `.fig` import: the layers of an instance scaled with the Scale tool draw at its scale factor, not at their main's lengths (#2091); a color profile per PNG, JPG and WebP export setting (Same as file, sRGB or Display P3), the pixels converted; a `.jam` connector end with an `AUTO` or `CENTER` magnet leaves the side facing the other end, not the side its stale saved point named (#1909); a FigJam elbow connector saved with its path (`connectorControlPoints`) keeps it on import, as a board connector reshaped by hand does, instead of being routed again (#1910); JPG exports take a quality, 1 to 100 with 90 the default, and embed the file's colour profile when it is sRGB too (#2004); a FigJam connector without a saved snapshot took no stroke and was invisible; its line's paint, weight, cap and dashes now come from the file's generated line record (#1807); a Dash cap setting (none, round or square) on Dash and Custom strokes, drawn on both ends of every dash; pasted layers whose image the clipboard lacks are named and show a placeholder that reads as missing (#1646); paint-style colours on layers pasted from another design app keep their style instead of turning black (#1638); imported and pasted text finds an installed family under the other names its fonts give it, and with other case and spacing (#1292); `.fig` export writes colour calculations as the colour they show in each mode and leaves out, with a warning, one that resolves to nothing (#1280); `.fig` import budgets four decoded values per compressed byte instead of one, still within 20M–128M, so dense files within that budget open instead of being refused as having too many values (#574); `.fig` ZIP image reads share a total byte budget and count skipped images in the import warnings (#1076); every file a command reads whole by path is a regular file within a cap that fits it: documents 16 GiB, placed images 256 MiB, CLI scripts 1 GiB; folders, devices and pipes are refused before anything is read (#1114); files nested 256 levels deep import on the browser's 1 MB stack (#1101); SVG and PDF exports count pattern sources and the renders they embed from the layer's depth, so one cap bounds a whole export (#1082); opening a `.figcraft` file unpacks at most 6 GiB in all (2 GiB in the browser), every area together (#1079); `.fig` instance expansion no longer walks variable nodes for every instance or copies every outer override row into each nested instance (#1077); a FigJam `.jam` file opens as a board (#1342); FigJam `.jam` files open like `.fig` files: File ▸ Open, drag and drop, `file.import` and the command line (#1342); SVG import reads `color()` and `color-mix()` colours, with a note and a grey for those it can't (#1550); SVG import draws each pattern tile once per scale, within the layer budget (#1080); a file's JPEG thumbnail can't crash the home screen (#1491's progressive JPEG check, now shared); `.fig` import: library text styles linked by asset key, and override rows restating a nested level (#1234); `.fig` import keeps the file's saved line breaks while the text and its box are unedited (#1236); Download a missing free font from the Missing fonts window (`font.download`, #754); offline Penpot 2.x import/export (#1143); `.sketch` import checked against Sketch's renders: master backgrounds, symbol clipping, tints before Sketch 64, mask opacity, bitmap fills, image overrides on shapes, stretching stacks, blur radii, colour adjustments, OKLab gradients, text growth, shape group borders (#1389); FigJam outer shape outlines and sticky body fallback beside author text (#1341, #1397); image member names are checked on read, and REST image placeholders get archive-safe keys (#1086); Android Vector Drawable (XML) export; `.fig` export: files the incumbent imports, with component set properties, and grid track sizes at its field ids; Save and auto-save don't replace changes another app made to the open file (#1330); `.sketch` import, best effort, Sketch 48 and newer; the PNG row names ignore overlapping layers and where include bounding box is offered; the Fonts table's missing-font row describes the Missing fonts window; `.figcraft` carries the file kind (boards); `.fig` import: resized instances and variable modes by asset key; atomic saves; auto-save; SVG export clip of nested frames; SVG/PDF export depth refusal (#208); `.fig` export: instance sizes, variables with modes, shared styles, variable-width strokes; `.fLine truncated
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-11-12 · **Change:** minor (`.fig` export writes vector region paints (#2302); `.fig` import and export read and write a boolean group's corner radius and smoothing (#2222); `.jam` import: stickies come in as native board stickies (#1808); `.fig` import scales per-point vector corner radii with the row that supplies their network and keeps different instance scales separate in the network cache (#2097); `.fig` export preserves scaled-instance lengths reset to their unscaled main values, including nested linked-style overrides (#2097); `.fig` import: the layers of an instance scaled with the Scale tool draw at its scale factor, not at their main's lengths (#2091); a color profile per PNG, JPG and WebP export setting (Same as file, sRGB or Display P3), the pixels converted; a `.jam` connector end with an `AUTO` or `CENTER` magnet leaves the side facing the other end, not the side its stale saved point named (#1909); a FigJam elbow connector saved with its path (`connectorControlPoints`) keeps it on import, as a board connector reshaped by hand does, instead of being routed again (#1910); JPG exports take a quality, 1 to 100 with 90 the default, and embed the file's colour profile when it is sRGB too (#2004); a FigJam connector without a saved snapshot took no stroke and was invisible; its line's paint, weight, cap and dashes now come from the file's generated line record (#1807); a Dash cap setting (none, round or square) on Dash and Custom strokes, drawn on both ends of every dash; pasted layers whose image the clipboard lacks are named and show a placeholder that reads as missing (#1646); paint-style colours on layers pasted from another design app keep their style instead of turning black (#1638); imported and pasted text finds an installed family under the other names its fonts give it, and with other case and spacing (#1292); `.fig` export writes colour calculations as the colour they show in each mode and leaves out, with a warning, one that resolves to nothing (#1280); `.fig` import budgets four decoded values per compressed byte instead of one, still within 20M–128M, so dense files within that budget open instead of being refused as having too many values (#574); `.fig` ZIP image reads share a total byte budget and count skipped images in the import warnings (#1076); every file a command reads whole by path is a regular file within a cap that fits it: documents 16 GiB, placed images 256 MiB, CLI scripts 1 GiB; folders, devices and pipes are refused before anything is read (#1114); files nested 256 levels deep import on the browser's 1 MB stack (#1101); SVG and PDF exports count pattern sources and the renders they embed from the layer's depth, so one cap bounds a whole export (#1082); opening a `.figcraft` file unpacks at most 6 GiB in all (2 GiB in the browser), every area together (#1079); `.fig` instance expansion no longer walks variable nodes for every instance or copies every outer override row into each nested instance (#1077); a FigJam `.jam` file opens as a board (#1342); FigJam `.jam` files open like `.fig` files: File ▸ Open, drag and drop, `file.import` and the command line (#1342); SVG import reads `color()` and `color-mix()` colours, with a note and a grey for those it can't (#1550); SVG import draws each pattern tile once per scale, within the layer budget (#1080); a file's JPEG thumbnail can't crash the home screen (#1491's progressive JPEG check, now shared); `.fig` import: library text styles linked by asset key, and override rows restating a nested level (#1234); `.fig` import keeps the file's saved line breaks while the text and its box are unedited (#1236); Download a missing free font from the Missing fonts window (`font.download`, #754); offline Penpot 2.x import/export (#1143); `.sketch` import checked against Sketch's renders: master backgrounds, symbol clipping, tints before Sketch 64, mask opacity, bitmap fills, image overrides on shapes, stretching stacks, blur radii, colour adjustments, OKLab gradients, text growth, shape group borders (#1389); FigJam outer shape outlines and sticky body fallback beside author text (#1341, #1397); image member names are checked on read, and REST image placeholders get archive-safe keys (#1086); Android Vector Drawable (XML) export; `.fig` export: files the incumbent imports, with component set properties, and grid track sizes at its field ids; Save and auto-save don't replace changes another app made to the open file (#1330); `.sketch` import, best effort, Sketch 48 and newer; the PNG row names ignore overlapping layers and where include bounding box is offered; the Fonts table's missing-font row describes the Missing fonts window; `.figcraft` carries the file kind (boards); `.fig` import: resized instances and variable modes by asset key; atomic saves; auto-save; SVG export clip of nested frames; SVG/PDF export depth refusal (#208); `.fig` export: instance sizes, variables witLine truncated
 
 Every format Figma reads or writes, with FigCraft's support. Sources: `Info.plist` of
 `/Applications/Figma.app` (document types only; nothing inside the bundle's code was read), Figma's
@@ -81,8 +81,9 @@ visible and opaque (a page also its background opacity): a reader takes what is
 draws nothing below a hidden page. The message
 lists one node change per layer, parents first, each with its GUID, its parent and a position
 string that orders it among its siblings; vector networks and outlines go in blobs, written once
-each. `.fig` export warns and drops vector region paint stacks; import and editing preserve their
-source paint coordinates.
+each. `.fig` export writes a vector's region paint stacks (each filled area's own paints as an entry of the
+network's style table, named by the area's style id); a region's kept paint frame is left out with a
+warning; import and editing preserve their source paint coordinates.
 
 Scaled instances retain an explicit override when a length is reset to the unscaled main's value,
 rather than losing it to the field diff. This covers corners, strokes, layout and grid lengths,
@@ -93,7 +94,7 @@ scales and empty-style clears; they have not been checked in other software.
 
 - **Written:** pages (name, background); frames, groups, sections, rectangles (as rounded
   rectangles, with their four radii), ellipses (arcs), polygons, stars, lines, vectors (editable
-  network blobs with per-point corner radius, handle mirroring, caps and joins, plus the outline of
+  network blobs with per-point corner radius, handle mirroring, caps and joins, each filled area's own paints, plus the outline of
   their filled areas), text, boolean groups, slices; the fill outline of frames and shapes and the
   stroke outline of plain strokes (a ring around boxes and whole ellipses, the widened path of other
   centred strokes);
@@ -133,7 +134,7 @@ scales and empty-style clears; they have not been checked in other software.
 - **Left out, with a warning each:** colour calculations that resolve to nothing (an operand
   missing, or more than 32 variables to read), variable bindings the format has no field for (component
   properties, arc fields, font weight: written as the values they give), text styles on part of a
-  text (written as values), variables' publishing, code syntax and inheritance settings, extended
+  text (written as values), the paint frames of vector regions, variables' publishing, code syntax and inheritance settings, extended
   collections (written as collections of their own), comments, Developer Mode annotations, statuses,
   resources, measurements and code links, plugin data, ruler
   guides, prototype device settings, slot properties and slot content, brush
@@ -196,6 +197,7 @@ scales and empty-style clears; they have not been checked in other software.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-11-12 | minor | M6, #2302: the `.fig` export writes the paints of a vector's own regions: each region with paints of its own (an empty list means unfilled) names an entry of the network's style table (`styleOverrideTable[].fillPaints`), equal lists share one entry, and a region without paints writes style 0. The fill outline is still one path with style 0. A region's kept paint frame is still left out, with a narrower warning. The importer already read this; not checked in other software |
 | 2026-11-10 | minor | M4, #2222: a boolean group's corner radius and smoothing are read and written by the `.fig` importer and exporter, and by the REST importer |
 | 2026-11-07 | patch | Fonts, #2092: a font loaded with `text.loadFont` is the counterpart of a font uploaded to the organization, which Figma's help center ("Manage conflicting fonts") ranks first, ahead of installed fonts and the web fonts. FigCraft chose the first face added for a family and style, so the built-in Inter 4.x kept Regular, SemiBold and Bold after Inter 3.19 was loaded and only Medium refitted. A loaded face now wins over the other faces of its family and style, the latest load over earlier ones; style matching and fallbacks are unchanged, and `refitted` lists the text whose size changes. Installed versus built-in order is not changed here. Test: `fontdb::tests::a_loaded_face_wins_over_the_built_in_one_of_its_family_and_style`. Numbers unchanged. |
 | 2026-11-08 | minor | M6, #2097 follow-up: per-point vector corner radii take the scale of the row supplying `vectorData`, including nested instance rows; override and derived rows are not scaled twice. Network caching distinguishes the instance scale even when resizing gives two vectors the same final box. Synthetic tests cover missing/unit factors, half/double scale, derived size alone, overridden and derived vector data, nested scale and equal-size cache separation. Layer-radius fallback remains the separate #2115 change. Numbers unchanged. |