Massive speedup on closing RT having a large image cache

see issue 1494

rtengine/safegtk.cc

@@ -97,6 +97,48 @@ Glib::RefPtr<Gio::FileInfo> safe_query_file_info (Glib::RefPtr<Gio::File> &file)
 # define SAFE_ENUMERATOR_CODE_END 	} if (error.get())	printf ("%s\n", error->what().c_str());}while (0)
 #endif
 
+#ifdef WIN32
+
+// High speed Windows version
+void safe_build_file_list (Glib::RefPtr<Gio::File> &dir, std::vector<FileMTimeInfo> &flist)
+{
+    Glib::ustring fullPath=dir->get_path() + Glib::ustring("\\*");
+
+    DWORD dwVersion=GetVersion();
+    bool win7Plus=(LOBYTE(LOWORD(dwVersion))>6) || ((LOBYTE(LOWORD(dwVersion))==6) && HIBYTE(LOWORD(dwVersion))>=1);  // 6.1 or better
+
+    wchar_t *wDirName = (wchar_t*)g_utf8_to_utf16 (fullPath.c_str(), -1, NULL, NULL, NULL);
+    WIN32_FIND_DATAW fi;
+
+    HANDLE hFF=FindFirstFileExW(wDirName,
+        //win7Plus ? FindExInfoBasic :    // TODO: Add if MinGW is updated, makes it even faster
+        FindExInfoStandard,&fi,
+        FindExSearchNameMatch,NULL,
+        win7Plus ? 2 : 0);  // Win7 large fetch
+
+    if (hFF != INVALID_HANDLE_VALUE) {
+        do {
+            SYSTEMTIME stUTC;
+            FileTimeToSystemTime(&fi.ftLastWriteTime, &stUTC);
+            char time[64];
+            sprintf(time,"%d-%02d-%02dT%02d:%02d:%02dZ",stUTC.wYear,stUTC.wMonth,stUTC.wDay,stUTC.wHour,stUTC.wMinute,stUTC.wSecond);
+            Glib::TimeVal timeVal;
+            timeVal.assign_from_iso8601(Glib::ustring(time));
+
+            char pathA[MAX_PATH];
+            WideCharToMultiByte(CP_UTF8,0,(WCHAR*)fi.cFileName,-1,pathA,MAX_PATH,0,0);
+            flist.push_back (FileMTimeInfo (removeExtension(Glib::ustring(pathA)), timeVal));
+
+        } while (FindNextFileW(hFF, &fi));
+
+        FindClose(hFF);
+    }
+
+    g_free(wDirName);
+}
+#else
+
+// Generic file list build
 void safe_build_file_list (Glib::RefPtr<Gio::File> &dir, std::vector<FileMTimeInfo> &flist)
 {
 	Glib::RefPtr<Gio::FileEnumerator> dirList;
@@ -106,7 +148,7 @@ void safe_build_file_list (Glib::RefPtr<Gio::File> &dir, std::vector<FileMTimeIn
 		SAFE_ENUMERATOR_CODE_END;
 	}
 }
-
+#endif
 /*
  * safe_build_file_list can now filter out at the source all files that doesn't have the extensions specified (if provided)
  */