Unify JPEG capture, metadata, and saving; reducing duplication

src/openflexure_microscope_server/things/camera/opencv.py

@@ -7,14 +7,13 @@ See repository root for licensing information.
 """
 
 from __future__ import annotations
-import io
-import json
+
 import logging
 from typing import Literal, Optional
 from threading import Thread
 
 import cv2
-import piexif
+from PIL import Image
 
 import labthings_fastapi as lt
 from labthings_fastapi.types.numpy import NDArray
@@ -100,30 +99,16 @@ class OpenCVCamera(BaseCamera):
             )
         return frame
 
-    @lt.thing_action
-    def capture_jpeg(
+    def capture_image(
         self,
-        metadata_getter: lt.deps.GetThingStates,
-        resolution: Literal["main", "full"] = "main",
+        stream_name: Literal["main", "full"] = "main",
+        wait: Optional[float] = None,
     ) -> JPEGBlob:
         """Acquire one image from the camera and return as a JPEG blob.
 
         This function will produce a JPEG image.
         """
-        logging.warning(f"OpenCV camera doesn't respect {resolution} setting")
-        frame = self.capture_array()
-        jpeg = cv2.imencode(".jpg", frame)[1].tobytes()
-        exif_dict = {
-            "Exif": {
-                piexif.ExifIFD.UserComment: json.dumps(metadata_getter()).encode(
-                    "utf-8"
-                )
-            },
-            "GPS": {},
-            "Interop": {},
-            "1st": {},
-            "thumbnail": None,
-        }
-        output = io.BytesIO()
-        piexif.insert(piexif.dump(exif_dict), jpeg, output)
-        return JPEGBlob.from_bytes(output.getvalue())
+        logging.warning(
+            f"Simulation camera doesn't respect {stream_name=} or {wait=} arguments."
+        )
+        return Image.fromarray(self.capture_array())