Remove Noise merged each small component into its most common neighbour
in one pass. When a speck was merged into a small region that was itself
merged away later, the region's flood fill skipped the speck's pixels
(already seen), so they stayed behind as a new island of the region's old
label. Higher Noise values merge more regions, so they left more such
islands: on noisy images the path count rose with Noise (70 -> 126 -> 206
paths from Noise 50 to 200 on one test image). denoise now repeats its pass
until one changes nothing; each merge joins two components, so it ends
(with a cap of 64 passes as a backstop). Labels shorter than w x h are left
alone instead of indexed past their end.
Tests: the minimal one-row case, a property test on random blocky noise
(no mergeable region under the minimum is left, and a larger minimum never
leaves more regions), and two noisy images whose path count must not rise
with Noise (both fail without the fix).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
A fourth Image Trace mode for flat-colour logos. The existing tracer follows hard pixel
edges, so an outline can only be as good as the pixel grid; here each pixel is read as a
blend of the logo's flat colours, the blend is interpolated smoothly (cubic B-spline), and
every outline is placed where two colours are equally present, to a fraction of a pixel.
Outlines are then cleaned the way a person would:
- corners the blur rounded are put back (line fits either side of a bend, intersected);
- near-straight runs and near-circular arcs become exact lines and arcs (Snap Curves To Lines);
- the rest is fitted with as few cubic Beziers as the tolerance allows (Schneider);
- touching colours overlap by 0.06 px so no hairline gap opens between independent fits;
- shapes are painted biggest first; transparent areas fully enclosed by artwork (letters
knocked out of a badge, the counters of an "o") are painted white so the logo reads the
same on any background, or become real holes with Ignore White (each hole belongs to the
smallest outline containing it);
- an outline whose fit strays more than 1.4 px from the raw contour is fitted plainly.
Colours are found automatically (and completed from pixels no blend of the known colours
explains, so a small accent is not lost) or named with `logoColors: ["#rrggbb", ...]` (white is
always its own class; colours closer than 12 count as one; at most ten). Gradients and photos
are refused with advice to use Color (a flat-colour score of the solid areas, 0.93). A
hard-edged source with no anti-aliasing is softened by under a pixel and fitted with looser
snap tolerances. Images over 1024 px on the long side are averaged down first (further, if
they are busy enough to make the unmixing expensive) and the result is mapped back exactly.
More real outlines than we will fit are refused, not silently truncated.
Also: a "Flat Logo" preset, the mode in the Image Trace panel (Method hidden: it always
stacks), the command docs and MCP prompt, es/fr/it/ru translations for the two new messages
and the mode name, and the ROADMAP.
Never-crash: no unwrap/expect/panic, every size and float is bounded and checked, with
tests for degenerate and extreme input (NaN/infinite parameters, 0x0 and 1x1 images, sparse
outlines, an anchor budget, a 200,000-entry palette) and a 250-run randomised no-panic
property test. The B-spline interpolation follows Unser et al. and Thevenaz et al., and the
curve fitter follows Schneider (Graphics Gems); both are written from the papers.
Measured (local experiment, not in CI): a flat-colour logo's vector original rendered down
to a soft 199x100 px PNG and traced. Mean edge error vs the original at 1600 px wide:
built-in colour presets 2.5 to 3.4 px, Flat Logo 0.78 px (0.48 px from a crisp source);
region overlap 0.88-0.91 vs 0.966. About 0.1 s for a 200 px logo.
Tests: 60 new in the trace crate (unmix, field, contours, geometry, Beziers, corners,
outline fitting, palette, end-to-end on synthetic shapes made in code) and 3 in the engine.
cargo xtask ci passes (fmt, clippy, test, assets, brands, layers, wasm): 4,290 tests.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Advanced › Create: Fills and/or Strokes, with Stroke (the widest line, px).
With Strokes, each colour's 8-connected parts no wider than the stroke width
(chamfer distance transform) trace as open centre lines instead of filled
outlines: the line is thinned to one pixel (Zhang-Suen with each removal
re-checked, so two-pixel lines survive; staircase corners dropped), its
skeleton becomes runs between ends and junctions (junction pixels merged,
spurs pruned, runs through two-way junctions joined, rings closed), and each
run is simplified and fitted with curves. The stroke width is the line's mean
width (pixels over length). Traced lines get round caps and joins in the
document. Without Fills, wider areas become 1 px stroked outlines.
`imageTrace.make` takes fills, strokes and strokeWidth, and refuses neither
fills nor strokes and a non-positive width.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Color mode's colours now come from a Palette (`palette` in imageTrace.make's
params), shown in the Image Trace panel under Mode:
- Limited: the `colors` best colours (what Color did before; the default).
- Full Tone: median cut until no colour box spans more than 96 (Less) … 8
(More) levels per channel, up to 256 colours, set by `colorDetail` 0-100
(the panel's Colors slider for this palette).
- Automatic: flat art (90% of the pixels in a few tight colours) traces with
exactly its colours, anything else as Full Tone.
- Document Library: the most used (at most `colors`) colours of the
document's swatches or of a swatch library (`library`: "document" or a
library id or name, chosen in the panel's Library list), used as they are;
traced shapes fill with the swatch's own colour, its colour model kept.
The library's colours are looked up at every trace, not saved.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Tracing a 2048 x 2048 photo with High Fidelity Photo made 733,000 paths
and 7.8 million anchors. The selected result's outlines and anchor
squares then made an egui mesh of 1.8 GB, over the GPU's largest buffer:
wgpu panicked while painting and the app quit (or ran out of memory
first, at 6.4 GB).
- Canvas: a selection with more than 100,000 anchors shows its bounds
instead of every outline and anchor, and the hover highlight skips
such an object. The Contextual Task Bar and that outline read the
selection's bounds from a per-revision cache (VectorcraftApp::
selection_bounds): a selected trace drew a frame in 20 ms, not 170.
- Image Trace: the colour layers are traced in parallel (26 s to 1.9 s
for that photo; the web traces them in turn). trace_within stops once
the paths pass an anchor budget; imageTrace.make allows two million
and otherwise reports the trace as too complex, with what to change.
Images over 64 megapixels are refused from their header, before they
are decoded.
- The trace crate's messages are translated (es, it) and scanned.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Shipped code no longer unwraps, expects or panics: every one of the 124
unwrap()/expect()/panic!/unreachable! sites outside tests now handles the
failure (Result/Option, ?, let-else, defaults) and reports errors to the user.
- Lints: workspace clippy denies unwrap_used, expect_used, panic, todo,
unimplemented and unreachable; clippy.toml allows them in tests, and
integration tests, examples and testkit opt out explicitly.
- Safety net (vectorcraft_engine::guard): a panic in a top-level command rolls
the document back and returns EngineError::Internal; a panicking tool is
reset; the MCP server answers with an internal error and keeps serving; the
UI frame and each control request are guarded.
- APIs that hid failures now return them: Rendered::to_png/to_jpeg/to_webp
return Result (JPEG/WebP errors used to write empty files),
FontDb::face returns Option, Region::top returns Option.
- Fuzzing: engine/tests/import_fuzz.rs feeds garbage, hostile and mutated SVG
and PDF through import → render → export (30k cases locally, no panics).
- Docs: AGENTS.md/CLAUDE.md rule, docs/development.md "Robustness" section,
README pointer and a PR template checklist.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
mateususa
Jax Spenser
bflatastic
Brandon Thomas