diff --git a/src/include/debug.h b/src/include/debug.h
new file mode 100644
index 00000000..83f7c6c5
--- /dev/null
+++ b/src/include/debug.h
@@ -0,0 +1,74 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+//                          IMPORTANT NOTICE
+//
+// The following open source license statement does not apply to any
+// entity in the Exception List published by FMSoft.
+//
+// For more information, please visit:
+//
+// https://www.fmsoft.cn/exception-list
+//
+//////////////////////////////////////////////////////////////////////////////
+/*
+ *   This file is part of MiniGUI, a mature cross-platform windowing
+ *   and Graphics User Interface (GUI) support system for embedded systems
+ *   and smart IoT devices.
+ *
+ *   Copyright (C) 2002~2020, Beijing FMSoft Technologies Co., Ltd.
+ *   Copyright (C) 1998~2002, WEI Yongming
+ *
+ *   This program is free software: you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation, either version 3 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ *   Or,
+ *
+ *   As this program is a library, any link to this program must follow
+ *   GNU General Public License version 3 (GPLv3). If you cannot accept
+ *   GPLv3, you need to be licensed from FMSoft.
+ *
+ *   If you have got a commercial license of this program, please use it
+ *   under the terms and conditions of the commercial license.
+ *
+ *   For more information about the commercial license, please refer to
+ *   <http://www.minigui.com/blog/minigui-licensing-policy/>.
+ */
+/*
+** debug.h: Some common debug helpers.
+**
+** Create date: 2020/02/12
+*/
+
+#ifndef GUI_DEBUG_H
+    #define GUI_DEBUG_H
+
+#include <string.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif  /* __cplusplus */
+
+static inline void dump_region (const CLIPRGN* rgn, const char* name)
+{
+    _WRN_PRINTF("rcBound of %s: (%d, %d, %d, %d); size (%d x %d)\n", name,
+            rgn->rcBound.left, rgn->rcBound.top,
+            rgn->rcBound.right, rgn->rcBound.bottom,
+            RECTW(rgn->rcBound), RECTH(rgn->rcBound));
+}
+
+#ifdef __cplusplus
+}
+#endif  /* __cplusplus */
+
+#endif  /* GUI_DEBUG_H */
+