1 /*
2  * Copyright (C) 2012 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 // Some native low-level image processing functions.
18 
19 
20 #ifndef ANDROID_FILTERFW_JNI_IMGPROCUTIL_H
21 #define ANDROID_FILTERFW_JNI_IMGPROCUTIL_H
22 
getIntensityFast(int R,int G,int B)23 inline int getIntensityFast(int R, int G, int B) {
24     return (R + R + R + B + G + G + G + G) >> 3;  // see http://stackoverflow.com/a/596241
25 }
26 
clamp(int min,int val,int max)27 inline int clamp(int min, int val, int max) {
28     return val < min ? min : (val > max ? max : val);
29         // Note that for performance reasons, this function does *not* check if min < max!
30 }
31 
32 #endif // ANDROID_FILTERFW_JNI_IMGPROCUTIL_H
33