33 lines
1.1 KiB
C
33 lines
1.1 KiB
C
/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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// Some native low-level image processing functions.
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#ifndef ANDROID_FILTERFW_JNI_IMGPROCUTIL_H
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#define ANDROID_FILTERFW_JNI_IMGPROCUTIL_H
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inline int getIntensityFast(int R, int G, int B) {
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return (R + R + R + B + G + G + G + G) >> 3; // see http://stackoverflow.com/a/596241
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}
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inline int clamp(int min, int val, int max) {
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return val < min ? min : (val > max ? max : val);
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// Note that for performance reasons, this function does *not* check if min < max!
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}
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#endif // ANDROID_FILTERFW_JNI_IMGPROCUTIL_H
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