1 files changed, 24 insertions, 0 deletions
diff --git a/src/mcp_sd15/preprocessors/depth.py b/src/mcp_sd15/preprocessors/depth.py
new file mode 100644
index 0000000..861b889
--- /dev/null
+++ b/src/mcp_sd15/preprocessors/depth.py
@@ -0,0 +1,24 @@
+"""MiDaS depth-map preprocessing."""
+
+from __future__ import annotations
+
+from typing import cast
+
+from PIL import Image
+
+
+class DepthPreprocessor:
+    """Lazily loads the fixed MiDaS annotator from the local cache."""
+
+    def __init__(self) -> None:
+        self._detector: object | None = None
+
+    def __call__(self, image: Image.Image) -> Image.Image:
+        if self._detector is None:
+            from controlnet_aux import MidasDetector
+
+            self._detector = MidasDetector.from_pretrained(
+                "lllyasviel/Annotators", local_files_only=True
+            )
+        result = cast(Image.Image, self._detector(image))  # type: ignore[operator]
+        return result.convert("RGB")