Enhance image processing performance and flexibility by introducing atomic counters, improving file pattern matching, and refining logo positioning logic.

MaddoShared/FileHelperSharp.cs

@@ -88,7 +88,28 @@ namespace MaddoShared
 
             DirectoryInfo destDir;
             destDir = new DirectoryInfo(Path.Combine(dirDest.FullName));
-            foreach (FileInfo file in dir.GetFiles(filter))
+
+            // Support multiple patterns separated by ';' or ','
+            var patterns = (filter ?? "*").Split(new[] { ';', ',' }, StringSplitOptions.RemoveEmptyEntries).Select(p => p.Trim()).ToArray();
+
+            // Collect matching files for all patterns and avoid duplicates
+            var matchedFiles = new List<FileInfo>();
+            foreach (var pat in patterns)
+            {
+                try
+                {
+                    matchedFiles.AddRange(dir.GetFiles(pat));
+                }
+                catch
+                {
+                    // Ignore pattern errors and continue
+                }
+            }
+
+            // Remove duplicates (by FullName)
+            var distinctFiles = matchedFiles.GroupBy(f => f.FullName, StringComparer.OrdinalIgnoreCase).Select(g => g.First()).OrderBy(f => f.Name).ToList();
+
+            foreach (FileInfo file in distinctFiles)
             {
                 contaFilePerDir += 1;