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