Specific file causes assertions in lighting.rs
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Description
Hi,
Running On Windows 11, latest version, this code:
use std::fs;
use resvg::{
tiny_skia::{Pixmap, Transform},
usvg::{Options, Tree},
};
fn main() -> Result<(), Box<dyn std::error::Error>> {
let svg_data = fs::read("circle_black.svg")?;
let mut opt = Options::default();
opt.fontdb_mut().load_system_fonts();
let tree = Tree::from_data(&svg_data, &opt)?;
let size = tree.size().to_int_size();
let mut pixmap = Pixmap::new(size.width(), size.height())
.ok_or("Failed to create pixmap")?;
resvg::render(&tree, Transform::default(), &mut pixmap.as_mut());
pixmap.save_png("output.png")?;
println!("Rendered to output.png");
Ok(())
}
And this file
Causes this assert
thread 'main' (42028) panicked at crates\resvg\src\filter\lighting.rs:185:5:
assertion failed: src.width == dest.width && src.height == dest.height
stack backtrace:
0: std::panicking::panic_handler
at /rustc/59807616e1fa2540724bfbac14d7976d7e4a3860/library\std\src\panicking.rs:689
1: core::panicking::panic_fmt
at /rustc/59807616e1fa2540724bfbac14d7976d7e4a3860/library\core\src\panicking.rs:80
2: core::panicking::panic
at /rustc/59807616e1fa2540724bfbac14d7976d7e4a3860/library\core\src\panicking.rs:150
3: resvg::filter::lighting::specular_lighting
at e:\smo\GitHub\resvg\crates\resvg\src\filter\lighting.rs:185
4: resvg::filter::apply_specular_lighting
at e:\smo\GitHub\resvg\crates\resvg\src\filter\mod.rs:1045
5: resvg::filter::apply_inner
at e:\smo\GitHub\resvg\crates\resvg\src\filter\mod.rs:446
6: resvg::filter::apply
at e:\smo\GitHub\resvg\crates\resvg\src\filter\mod.rs:340
7: resvg::render::render_group
at e:\smo\GitHub\resvg\crates\resvg\src\render.rs:110
8: resvg::render::render_node
at e:\smo\GitHub\resvg\crates\resvg\src\render.rs:29
9: resvg::render::render_nodes
at e:\smo\GitHub\resvg\crates\resvg\src\render.rs:17
10: resvg::render
at e:\smo\GitHub\resvg\crates\resvg\src\lib.rs:49
11: svg_render_demo::main
at e:\smo\GitHub\resvg\crates\c-api\examples\svg_render_demo\src\main.rs:22
12: core::ops::function::FnOnce::call_once<enum2$<core::result::Result<tuple$<>,alloc::boxed::Box<dyn$<core::error::Error>,alloc::alloc::Global> > > (*)(),tuple$<> >
at C:\Users\simon\.rustup\toolchains\stable-x86_64-pc-windows-msvc\lib\rustlib\src\rust\library\core\src\ops\function.rs:250
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
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First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start at crates/resvg/src/filter/lighting.rs:185, then follow the apply_specular_lighting call in crates/resvg/src/filter/mod.rs. Reproduce the panic with the supplied SVG and rendering example, and verify that the file no longer triggers the assertion while producing output.png.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- rust
- Domain
- computer-graphics
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Quiet
- Clarity
- Mostly clear
- Newbie friendliness
- 52/100