1 /*
2  * Copyright (C) 2011 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #ifndef _EDGEPOINTERUTIL_H_
18 #define _EDGEPOINTERUTIL_H_
19 
20 typedef short EdgePointer;
21 
sym(EdgePointer a)22 inline EdgePointer sym(EdgePointer a)
23 {
24   return a ^ 2;
25 }
26 
rot(EdgePointer a)27 inline EdgePointer rot(EdgePointer a)
28 {
29   return (((a) + 1) & 3) | ((a) & ~3);
30 }
31 
rotinv(EdgePointer a)32 inline EdgePointer rotinv(EdgePointer a)
33 {
34   return (((a) + 3) & 3) | ((a) & ~3);
35 }
36 
37 #endif //_EDGEPOINTERUTIL_H_
38