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A cubic whose second control point is its end point (as the `y` operator builds, ISO 32000-2 8.5.2.1 Table 58) has a zero derivative at its end. kurbo 0.13.1's offset curve looks for cusps with a root search on the curvature, which grows without bound towards that end; at some widths the search stops on the end point and normalising the zero tangent there gives NaN. vello_common's fill drops any outline with NaN, so the whole stroke vanished (a two-curve `y` path drew nothing at 16, 32 and 63 pt; a PDFBox tracker file lost its 32 pt "XX" outline). The NaN fallback that #4913 added to `flatten::stroke` now also moves such a control point the stroke tolerance towards the previous control point before stroking again (the curve moves by at most 4/9 of the tolerance). Outlines that come back finite take the old path unchanged. The vendor ledger row also gets back #4913's entry, which a merge had dropped. Claude-Session: https://claude.ai/code/session_01Pq7HyCHD1R3rywQBPCHXZA Co-authored-by: mtlcl410 <chuanlin@niar.org.tw> Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Vello Common
Shared data structures
This crate includes common geometry representations, tiling logic, and other fundamental components used by both Vello CPU and Vello Hybrid.
Usage
This crate should not be used on its own, and you should instead use one of the renderers which use it. At the moment, only Vello CPU is published, and you probably want to use that.
We also develop Vello, which makes use of the GPU for 2D rendering and has higher performance than Vello CPU. Vello CPU is being developed as part of work to address shortcomings in Vello. Vello does not use this crate.
Features
std(enabled by default): Get floating point functions from the standard library (likely using your target's libc).libm: Use floating point implementations from libm.png(enabled by default): Allow loadingPixmaps from PNG images. Also required for rendering glyphs with an embedded PNG. Impliesstd.
At least one of std and libm is required; std overrides libm.
Contents
- Shared data structures for paths, tiles, and strips
- Geometry processing utilities
- Common logic for rendering stages
This crate acts as a foundation for vello_cpu and vello_hybrid, providing essential components to minimize duplication.
Minimum supported Rust Version (MSRV)
This version of Vello Common has been verified to compile with Rust 1.92 and later.
Future versions of Vello Common might increase the Rust version requirement. It will not be treated as a breaking change and as such can even happen with small patch releases.
Click here if compiling fails.
As time has passed, some of Vello Common's dependencies could have released versions with a higher Rust requirement. If you encounter a compilation issue due to a dependency and don't want to upgrade your Rust toolchain, then you could downgrade the dependency.
# Use the problematic dependency's name and version
cargo update -p package_name --precise 0.1.1
Community
Discussion of Vello Common development happens in the Linebender Zulip, specifically the #vello channel. All public content can be read without logging in.
Contributions are welcome by pull request. The Rust code of conduct applies.
License
Licensed under either of
- Apache License, Version 2.0 (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
- MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)
at your option.