fix integration tests

Cargo.toml

@@ -2,7 +2,7 @@
 name = "imageproc"
 version = "0.26.0"
 authors = ["theotherphil"]
-rust-version = "1.82.0"
+rust-version = "1.85.1"
 edition = "2021"
 license = "MIT"
 description = "Image processing operations"
@@ -46,6 +46,10 @@ assert_approx_eq = "1.1.0"
 proptest = "1.4.0"
 wasm-bindgen-test = "0.3.38"
 
+[build-dependencies]
+cargo_metadata = "0.23"
+semver = "1.0.27"
+
 [package.metadata.docs.rs]
 # See https://github.com/image-rs/imageproc/issues/358
 # all-features = true

build.rs

@@ -0,0 +1,22 @@
+use cargo_metadata::MetadataCommand;
+use semver::Version;
+
+fn main() {
+    println!("cargo::rustc-check-cfg=cfg(lagacy_image)");
+    println!("cargo:rerun-if-changed=Cargo.lock");
+
+    let metadata = MetadataCommand::new()
+        .exec()
+        .expect("Failed to fetch metadata");
+
+    let image_version = &metadata
+        .packages
+        .iter()
+        .find(|p| p.name == "image")
+        .expect("image crate not found in dependencies")
+        .version;
+
+    if image_version < &Version::parse("0.25.8").unwrap() {
+        println!("cargo:rustc-cfg=lagacy_image");
+    }
+}

tests/regression.rs

@@ -42,7 +42,11 @@ use imageproc::{
 const INPUT_DIR: &str = "./tests/data";
 
 /// The directory containing the truth images to compare against test outputs.
-const TRUTH_DIR: &str = "./tests/data/truth";
+const TRUTH_DIR: &str = if cfg!(lagacy_image) {
+    "./tests/data/legacy"
+} else {
+    "./tests/data/truth"
+};
 
 // If the REGENERATE environment variable is set then running tests will update the truth files
 // to match the output of the current code.