hayro

A crate for rendering PDF files.

This crate allows you to render pages of a PDF file into bitmaps. It is supposed to be relatively lightweight, since we do not have any dependencies on the GPU. All the rendering happens on the CPU.

The ultimate goal of this crate is to be a feature-complete and performant PDF rasterizer. With that said, we are currently still very far away from reaching that goal: So far, no effort has been put into performance optimizations, as we are still working on implementing missing features. However, this crate is currently the most comprehensive and feature-complete implementation of a PDF rasterizer in pure Rust. This claim is supported by the fact that we currently include over 1000 PDF files in our regression test suite. The majority of those have been scraped from the pdf.js and PDFBOX test suites and therefore represent a very large and diverse sample of PDF files.

As mentioned, there are still some serious limitations, including lack of support for encrypted/password-protected PDF files, blending and isolation, knockout groups as well as a range of smaller features such as color key masking. But you should be able to render the vast majority of PDF files without too many issues.

Safety

This crate forbids unsafe code via a crate-level attribute.

Examples

For usage examples, see the example in the GitHub repository.

Cargo features

This crate has two optional features:

• jpeg2000: See the description of hayro-syntax for more information.
• embed-fonts: See the description of hayro-interpret for more information.

License

This crate is available under the Apache 2.0 license.