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* M2: snap shrunk interpolated images to whole pixels so scans stay sharp A scanned page (one 300 dpi image with /Interpolate true) was shrunk to a ceil-sized raster and then sampled a second time at a fractional scale and offset, which softened every edge next to Acrobat. An axis-aligned shrunk interpolated image is now shrunk once to its rounded device rectangle and drawn 1:1 at the rounded corner. Rotated, skewed, flipped, Type 3 and non-interpolated images are unchanged. On a synthetic scan page the mean error against an area-average reference falls from 3.4 to 1.6 grey levels at 96 dpi (3.0 to 1.5 at 144 dpi). Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> * vendor: list the hayro snap patch as (14) in the Patches and Tests columns; correct gaps.md patch counts The patch description had been appended to the Tests column of one of the two hayro rows. gaps.md now counts the distinct patches vendor/README.md lists (26 hayro-interpret, 15 hayro, 3 hayro-jbig2, 17 hayro-syntax). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> --------- Co-authored-by: Claude Sonnet 5.5 <noreply@anthropic.com> Co-authored-by: Brandon Thomas <echelon@gmail.com> |
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| .. | ||
| examples | ||
| src | ||
| .cargo-ok | ||
| .cargo_vcs_info.json | ||
| Cargo.lock | ||
| Cargo.toml | ||
| Cargo.toml.orig | ||
| LICENSE-APACHE | ||
| LICENSE-MIT | ||
| README.md | ||
README.md
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.