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* M2: clip intersection starts its row walk at the first shared row clip::intersect in vello_common, the step every clipped path passes through, began its walk over strip rows at the earlier of the two paths' first rows. Each path therefore visited every row above it, although rows where one path has no strips produce no output. Every page is clipped (the crop box is a clip), so this ran for every stroke of every render: on the A1 engineering sample it was the hottest function in a full-page render. Start at the later first row, as vello_common 0.1 does. The strips and the pixels are unchanged; a test counts the rows the walk visits and fails without the change. vello_common 0.0.8 is vendored with that one-line PdfCraft patch (marked in the source), its unit test, the vendor/README.md row and an ATTRIBUTION.toml entry for its reference image. Cargo.lock records it as a path crate. Co-Authored-By: Claude Haiku 5.5 <noreply@anthropic.com> * Refresh catalog hashes after merging main --------- Co-authored-by: Claude Haiku 5.5 <noreply@anthropic.com> Co-authored-by: Brandon Thomas <echelon@gmail.com>
101 lines
4.1 KiB
Markdown
101 lines
4.1 KiB
Markdown
<div align="center">
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# Vello Common
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**Shared data structures**
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[](https://crates.io/crates/vello_common)
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[](https://docs.rs/vello_common)
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[](#license)
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\
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[](https://xi.zulipchat.com/#narrow/channel/197075-vello)
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[](https://github.com/linebender/vello/actions)
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[](https://deps.rs/crate/vello_common)
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</div>
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<!-- We use cargo-rdme to update the README with the contents of lib.rs.
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To edit the following section, update it in lib.rs, then run:
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cargo rdme --workspace-project=vello_common
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Full documentation at https://github.com/orium/cargo-rdme -->
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<!-- Intra-doc links used in lib.rs should be evaluated here.
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See https://linebender.org/blog/doc-include/ for related discussion. -->
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[libm]: https://crates.io/crates/libm
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[crate::pixmap::Pixmap]: https://docs.rs/vello_common/latest/vello_common/pixmap/struct.Pixmap.html
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<!-- cargo-rdme start -->
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This crate includes common geometry representations, tiling logic, and other fundamental components used by both [Vello CPU][vello_cpu] and Vello Hybrid.
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## Usage
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This crate should not be used on its own, and you should instead use one of the renderers which use it.
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At the moment, only [Vello CPU][vello_cpu] is published, and you probably want to use that.
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We also develop [Vello](https://crates.io/crates/vello), which makes use of the GPU for 2D rendering and has higher performance than Vello CPU.
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Vello CPU is being developed as part of work to address shortcomings in Vello.
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Vello does not use this crate.
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## Features
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- `std` (enabled by default): Get floating point functions from the standard library
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(likely using your target's libc).
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- `libm`: Use floating point implementations from [libm][].
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- `png` (enabled by default): Allow loading [`Pixmap`][crate::pixmap::Pixmap]s from PNG images.
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Also required for rendering glyphs with an embedded PNG.
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Implies `std`.
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At least one of `std` and `libm` is required; `std` overrides `libm`.
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## Contents
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- Shared data structures for paths, tiles, and strips
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- Geometry processing utilities
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- Common logic for rendering stages
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This crate acts as a foundation for `vello_cpu` and `vello_hybrid`, providing essential components to minimize duplication.
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[vello_cpu]: https://crates.io/crates/vello_cpu
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<!-- cargo-rdme end -->
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## Minimum supported Rust Version (MSRV)
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This version of Vello Common has been verified to compile with **Rust 1.92** and later.
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Future versions of Vello Common might increase the Rust version requirement.
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It will not be treated as a breaking change and as such can even happen with small patch releases.
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<details>
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<summary>Click here if compiling fails.</summary>
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As time has passed, some of Vello Common's dependencies could have released versions with a higher Rust requirement.
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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.
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```sh
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# Use the problematic dependency's name and version
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cargo update -p package_name --precise 0.1.1
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```
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</details>
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## Community
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Discussion of Vello Common development happens in the [Linebender Zulip](https://xi.zulipchat.com/), specifically the [#vello channel](https://xi.zulipchat.com/#narrow/channel/197075-vello).
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All public content can be read without logging in.
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Contributions are welcome by pull request.
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The [Rust code of conduct] applies.
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## License
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Licensed under either of
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- Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or <http://www.apache.org/licenses/LICENSE-2.0>)
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- MIT license ([LICENSE-MIT](LICENSE-MIT) or <http://opensource.org/licenses/MIT>)
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at your option.
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[Rust code of conduct]: https://www.rust-lang.org/policies/code-of-conduct
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