Added webp image conversion.

Author: msimms

DataMgr.py

@@ -34,6 +34,7 @@
 import BmiCalculator
 import FtpCalculator
 import HeartRateCalculator
+import Image
 import Importer
 import InputChecker
 import Keys
@@ -483,9 +484,12 @@ def attach_photo_to_activity(self, user_id, uploaded_file_data, activity_id):
         if len(decoded_file_data) > self.config.get_photos_max_file_size():
             raise Exception("The file is too large.")
 
+        # Convert the image to webp.
+        webp_file_data = Image.to_webp_scaled_50(decoded_file_data)
+
         # Hash the photo. This will prevent duplicates as well as give us a unique name.
         h = hashlib.sha512()
-        h.update(str(decoded_file_data).encode('utf-8'))
+        h.update(str(webp_file_data).encode('utf-8'))
         hash_str = h.hexdigest()
 
         # Where are we storing photos?
@@ -496,7 +500,7 @@ def attach_photo_to_activity(self, user_id, uploaded_file_data, activity_id):
             local_file_name = os.path.join(user_photos_dir, hash_str)
             if not os.path.isfile(local_file_name):
                 with open(local_file_name, 'wb') as local_file:
-                    local_file.write(decoded_file_data)
+                    local_file.write(webp_file_data)
         except:
             raise Exception("Could not save the photo.")
 

Image.py

@@ -0,0 +1,49 @@
+# -*- coding: utf-8 -*-
+# 
+# # MIT License
+# 
+# Copyright (c) 2025 Michael J Simms
+# 
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+# 
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+# 
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+
+from io import BytesIO
+from PIL import Image
+
+def to_webp_scaled_50(image_bytes: bytes, *, quality: int = 80, lossless: bool = False) -> bytes:
+    """Converts an in-memory image (bytes) to WebP scaled to 50%. Returns WebP bytes."""
+    with Image.open(BytesIO(image_bytes)) as img:
+
+        # Calculate 50% size
+        new_w = max(1, img.width // 2)
+        new_h = max(1, img.height // 2)
+
+        # High-quality downscale
+        img_resized = img.resize((new_w, new_h), Image.Resampling.LANCZOS)
+
+        # Write to an in-memory buffer as WebP
+        out = BytesIO()
+        img_resized.save(
+            out,
+            format="WEBP",
+            quality=quality,    # 0-100 (ignored when lossless=True)
+            lossless=lossless,  # set True for lossless WebP
+            method=6,           # 0-6, slower = better compression
+            optimize=True
+        )
+        return out.getvalue()