librsvg source for verification 2026-05-22

rsvg/tests/errors.rs

@@ -0,0 +1,58 @@
+//! Tests for loading errors.
+//!
+//! Note that all the tests in this module are `#[ignore]`.  This is because they
+//! take a much longer time to run than normal tests, as they depend upon actually
+//! hitting the limits in librsvg for the number of loaded elements, or the number
+//! of referenced elements during rendering.
+//!
+//! There is a *big* difference in the run-time of these tests when compiled with
+//! `--release` versus `--debug`.  So, we will only run them in release-mode tests.
+
+#![cfg(test)]
+
+use rsvg::{CairoRenderer, ImplementationLimit, Loader, LoadingError, RenderingError};
+
+#[ignore]
+#[test]
+fn too_many_elements() {
+    let name = "tests/fixtures/errors/bug515-too-many-elements.svgz";
+
+    assert!(matches!(
+        Loader::new().read_path(name),
+        Err(LoadingError::LimitExceeded(
+            ImplementationLimit::TooManyLoadedElements
+        ))
+    ));
+}
+
+fn rendering_instancing_limit(name: &str) {
+    let handle = Loader::new()
+        .read_path(name)
+        .unwrap_or_else(|e| panic!("could not load: {}", e));
+
+    let surface = cairo::ImageSurface::create(cairo::Format::ARgb32, 500, 500).unwrap();
+    let cr = cairo::Context::new(&surface).expect("Failed to create a cairo context");
+
+    // Note that at least 515-patttern-billion-laughs.svg requires a viewport of this size
+    // or bigger; a smaller one causes the recursive patterns to get so small that they
+    // are culled out, and so the document doesn't reach the instancing limit.
+    match CairoRenderer::new(&handle)
+        .render_document(&cr, &cairo::Rectangle::new(0.0, 0.0, 500.0, 500.0))
+    {
+        Ok(_) => (),
+        Err(RenderingError::LimitExceeded(ImplementationLimit::TooManyReferencedElements)) => (),
+        _ => panic!("unexpected error code"),
+    }
+}
+
+#[ignore]
+#[test]
+fn instancing_limit1() {
+    rendering_instancing_limit("tests/fixtures/errors/bug323-nested-use.svg");
+}
+
+#[ignore]
+#[test]
+fn instancing_limit2() {
+    rendering_instancing_limit("tests/fixtures/errors/bug515-pattern-billion-laughs.svg");
+}