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/*
* Copyright 2018 Google LLC All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.skar;
import android.graphics.ColorFilter;
import android.graphics.ColorMatrix;
import android.graphics.ColorMatrixColorFilter;
import java.util.Arrays;
public class PaintUtil {
private static final float MIDDLE_GRAY_GAMMA = 0.466f;
/**
* Returns a ColorFilter that can be used on a Paint to apply color correction effects
* as documented by ARCore.
*
* @param colorCorr output array of getColorCorrection() from ARCore
* @return ColorFilter with effects applied
*/
public static ColorFilter createLightCorrectionColorFilter(float[] colorCorr) {
float[] colorCorrCopy = Arrays.copyOf(colorCorr, 4);
for (int i = 0; i < 3; i++) {
colorCorrCopy[i] *= colorCorrCopy[3] / MIDDLE_GRAY_GAMMA;
}
ColorMatrix m = new ColorMatrix();
m.setScale(colorCorrCopy[0], colorCorrCopy[1], colorCorrCopy[2], 1);
return new ColorMatrixColorFilter(m);
}
}
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