Refactored PDFium initialization (#440)

runtime/src/pdfium.rs

@@ -0,0 +1,26 @@
+use std::sync::Mutex;
+use once_cell::sync::Lazy;
+use pdfium_render::prelude::Pdfium;
+
+pub static PDFIUM_LIB_PATH: Lazy<Mutex<Option<String>>> = Lazy::new(|| Mutex::new(None));
+
+pub trait PdfiumInit {
+    fn ai_studio_init() -> Pdfium;
+}
+
+impl PdfiumInit for Pdfium {
+
+    /// Initializes the PDFium library for AI Studio.
+    fn ai_studio_init() -> Pdfium {
+        let lib_path = PDFIUM_LIB_PATH.lock().unwrap();
+        if let Some(path) = lib_path.as_ref() {
+            return Pdfium::new(
+                Pdfium::bind_to_library(Pdfium::pdfium_platform_library_name_at_path(path))
+                    .or_else(|_| Pdfium::bind_to_system_library())
+                    .unwrap(),
+            );
+        }
+
+        Pdfium::new(Pdfium::bind_to_system_library().unwrap())
+    }
+}