[Other] Add static create methods to Mat (#497)

* [Other] Add static create methods to Mat

* [Other] avoid field name conflicts

fastdeploy/vision/common/processors/proc_lib.h

@@ -0,0 +1,32 @@
+// Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#pragma once
+#include "fastdeploy/utils/utils.h"
+
+namespace fastdeploy {
+namespace vision {
+
+enum class FASTDEPLOY_DECL ProcLib { DEFAULT, OPENCV, FLYCV };
+
+struct FASTDEPLOY_DECL DefaultProcLib {
+  // default_lib has the highest priority
+  // all the function in `processor` will force to use
+  // default_lib if this flag is set.
+  // DEFAULT means this flag is not set
+  static ProcLib default_lib;
+};
+
+}  // namespace vision
+}  // namespace fastdeploy