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/*
* Copyright (C) 2017 The Android Open Source Project
*
* 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 android.hardware.display;
import android.os.Parcel;
import android.os.Parcelable;
import android.util.Pair;
import com.android.internal.util.Preconditions;
import java.util.Arrays;
/** @hide */
public final class BrightnessConfiguration implements Parcelable {
private final float[] mLux;
private final float[] mNits;
private BrightnessConfiguration(float[] lux, float[] nits) {
mLux = lux;
mNits = nits;
}
/**
* Gets the base brightness as curve.
*
* The curve is returned as a pair of float arrays, the first representing all of the lux
* points of the brightness curve and the second representing all of the nits values of the
* brightness curve.
*
* @return the control points for the brightness curve.
*/
public Pair<float[], float[]> getCurve() {
return Pair.create(Arrays.copyOf(mLux, mLux.length), Arrays.copyOf(mNits, mNits.length));
}
@Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeFloatArray(mLux);
dest.writeFloatArray(mNits);
}
@Override
public int describeContents() {
return 0;
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder("BrightnessConfiguration{[");
final int size = mLux.length;
for (int i = 0; i < size; i++) {
if (i != 0) {
sb.append(", ");
}
sb.append("(").append(mLux[i]).append(", ").append(mNits[i]).append(")");
}
sb.append("]}");
return sb.toString();
}
@Override
public int hashCode() {
int result = 1;
result = result * 31 + Arrays.hashCode(mLux);
result = result * 31 + Arrays.hashCode(mNits);
return result;
}
@Override
public boolean equals(Object o) {
if (o == this) {
return true;
}
if (!(o instanceof BrightnessConfiguration)) {
return false;
}
final BrightnessConfiguration other = (BrightnessConfiguration) o;
return Arrays.equals(mLux, other.mLux) && Arrays.equals(mNits, other.mNits);
}
public static final Creator<BrightnessConfiguration> CREATOR =
new Creator<BrightnessConfiguration>() {
public BrightnessConfiguration createFromParcel(Parcel in) {
Builder builder = new Builder();
float[] lux = in.createFloatArray();
float[] nits = in.createFloatArray();
builder.setCurve(lux, nits);
return builder.build();
}
public BrightnessConfiguration[] newArray(int size) {
return new BrightnessConfiguration[size];
}
};
/**
* A builder class for {@link BrightnessConfiguration}s.
*/
public static class Builder {
private float[] mCurveLux;
private float[] mCurveNits;
/**
* Sets the control points for the brightness curve.
*
* Brightness curves must have strictly increasing ambient brightness values in lux and
* monotonically increasing display brightness values in nits. In addition, the initial
* control point must be 0 lux.
*
* @throws IllegalArgumentException if the initial control point is not at 0 lux.
* @throws IllegalArgumentException if the lux levels are not strictly increasing.
* @throws IllegalArgumentException if the nit levels are not monotonically increasing.
*/
public Builder setCurve(float[] lux, float[] nits) {
Preconditions.checkNotNull(lux);
Preconditions.checkNotNull(nits);
if (lux.length == 0 || nits.length == 0) {
throw new IllegalArgumentException("Lux and nits arrays must not be empty");
}
if (lux.length != nits.length) {
throw new IllegalArgumentException("Lux and nits arrays must be the same length");
}
if (lux[0] != 0) {
throw new IllegalArgumentException("Initial control point must be for 0 lux");
}
Preconditions.checkArrayElementsInRange(lux, 0, Float.MAX_VALUE, "lux");
Preconditions.checkArrayElementsInRange(nits, 0, Float.MAX_VALUE, "nits");
checkMonotonic(lux, true/*strictly increasing*/, "lux");
checkMonotonic(nits, false /*strictly increasing*/, "nits");
mCurveLux = lux;
mCurveNits = nits;
return this;
}
/**
* Builds the {@link BrightnessConfiguration}.
*
* A brightness curve <b>must</b> be set before calling this.
*/
public BrightnessConfiguration build() {
if (mCurveLux == null || mCurveNits == null) {
throw new IllegalStateException("A curve must be set!");
}
return new BrightnessConfiguration(mCurveLux, mCurveNits);
}
private static void checkMonotonic(float[] vals, boolean strictlyIncreasing, String name) {
if (vals.length <= 1) {
return;
}
float prev = vals[0];
for (int i = 1; i < vals.length; i++) {
if (prev > vals[i] || prev == vals[i] && strictlyIncreasing) {
String condition = strictlyIncreasing ? "strictly increasing" : "monotonic";
throw new IllegalArgumentException(name + " values must be " + condition);
}
prev = vals[i];
}
}
}
}
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