fix: 完善 libyuv 静态库构建

res/vcpkg/libyuv/build.rs

@@ -86,6 +86,21 @@ fn generate_bindings(cpp_dir: &Path) {
 }
 
 fn link_libyuv() {
+    println!("cargo:rerun-if-env-changed=ONE_KVM_LIBS_PATH");
+    println!("cargo:rerun-if-env-changed=LIBYUV_STATIC");
+
+    // An explicit library root must take precedence over host discovery.
+    if env::var("ONE_KVM_LIBS_PATH")
+        .ok()
+        .is_some_and(|path| !path.trim().is_empty())
+    {
+        if link_system() {
+            return;
+        }
+
+        panic!("libyuv not found under ONE_KVM_LIBS_PATH");
+    }
+
     // Try vcpkg first
     if let Some(vcpkg_installed) = vcpkg_installed_root() {
         if link_vcpkg(vcpkg_installed) {
@@ -232,9 +247,13 @@ fn link_system() -> bool {
     // Build custom library paths based on target architecture:
     // 1. Check ONE_KVM_LIBS_PATH environment variable (explicit override)
     // 2. Fall back to architecture-based detection
-    let custom_lib_path = if let Ok(path) = env::var("ONE_KVM_LIBS_PATH") {
-        format!("{}/lib", path)
-    } else {
+    let explicit_lib_root = env::var("ONE_KVM_LIBS_PATH")
+        .ok()
+        .filter(|path| !path.trim().is_empty());
+    let custom_lib_path = explicit_lib_root
+        .as_ref()
+        .map(|path| format!("{}/lib", path))
+        .unwrap_or_else(|| {
             match target_arch.as_str() {
                 "x86_64" => "/usr/local/lib",
                 "aarch64" => "/usr/aarch64-linux-gnu/lib",
@@ -242,7 +261,7 @@ fn link_system() -> bool {
                 _ => "",
             }
             .to_string()
-    };
+        });
 
     // Try common system library paths (custom paths first)
     let mut lib_paths: Vec<String> = Vec::new();
@@ -252,7 +271,8 @@ fn link_system() -> bool {
         lib_paths.push(custom_lib_path);
     }
 
-    // Then standard paths
+    // An explicit root is strict: do not silently fall back to host libraries.
+    if explicit_lib_root.is_none() {
         lib_paths.extend(
             [
                 "/usr/local/lib", // Custom builds
@@ -266,6 +286,7 @@ fn link_system() -> bool {
             .iter()
             .map(|s| s.to_string()),
         );
+    }
 
     for path in &lib_paths {
         let lib_path = Path::new(path);

res/vcpkg/libyuv/src/lib.rs

@@ -1391,4 +1391,15 @@ mod tests {
         assert_eq!(converter.dimensions(), (8, 8));
         assert_eq!(converter.nv12_buffer().len(), nv12_size(8, 8));
     }
+
+    #[test]
+    fn test_bgr24_to_nv12() {
+        let src = [0u8; 2 * 2 * 3];
+        let mut dst = [0xffu8; 2 * 2 * 3 / 2];
+
+        bgr24_to_nv12(&src, &mut dst, 2, 2).unwrap();
+
+        assert_eq!(&dst[..4], &[16, 16, 16, 16]);
+        assert_eq!(&dst[4..], &[128, 128]);
+    }
 }