a5e378fd4b
A tile of a large page renders the whole page with an offset, and hayro stroked and filled every path on it before vello discarded what fell outside the tile. Vendored hayro patch (9), `may_paint_canvas`, skips a fill or stroke whose box misses the canvas: the box of the path's points and control points (a curve stays inside their hull), grown by the stroke's reach (half the width times the larger of the miter limit and sqrt 2), by 0.5 user units for vello's and kurbo's approximation tolerances, and by 2 device pixels for antialiasing. Empty paths and non-finite bounds or miter limits are always drawn. Renders are byte-identical with and without skipping (`skipping_paths_off_the_canvas_changes_no_pixel`; the hidden per-thread `set_skip_offscreen_paths` exists for that test). On #623's sample at scale 2, a 1024 px tile takes about 38% less CPU time; whole pages are unchanged. Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com> Co-authored-by: Brandon Thomas <echelon@gmail.com>
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 one optional feature:
embed-fonts: See the description ofhayro-interpretfor more information.
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.