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/*
* Copyright (C) 2014 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 com.android.contacts.common.util;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.os.Parcel;
import android.os.Parcelable;
import android.os.Trace;
import com.android.contacts.common.R;
public class MaterialColorMapUtils {
private final TypedArray sPrimaryColors;
private final TypedArray sSecondaryColors;
public MaterialColorMapUtils(Resources resources) {
sPrimaryColors =
resources.obtainTypedArray(com.android.contacts.common.R.array.letter_tile_colors);
sSecondaryColors =
resources.obtainTypedArray(com.android.contacts.common.R.array.letter_tile_colors_dark);
}
public static MaterialPalette getDefaultPrimaryAndSecondaryColors(Resources resources) {
final int primaryColor = resources.getColor(R.color.quickcontact_default_photo_tint_color);
final int secondaryColor =
resources.getColor(R.color.quickcontact_default_photo_tint_color_dark);
return new MaterialPalette(primaryColor, secondaryColor);
}
/**
* Returns the hue component of a color int.
*
* @return A value between 0.0f and 1.0f
*/
public static float hue(int color) {
int r = (color >> 16) & 0xFF;
int g = (color >> 8) & 0xFF;
int b = color & 0xFF;
int V = Math.max(b, Math.max(r, g));
int temp = Math.min(b, Math.min(r, g));
float H;
if (V == temp) {
H = 0;
} else {
final float vtemp = V - temp;
final float cr = (V - r) / vtemp;
final float cg = (V - g) / vtemp;
final float cb = (V - b) / vtemp;
if (r == V) {
H = cb - cg;
} else if (g == V) {
H = 2 + cr - cb;
} else {
H = 4 + cg - cr;
}
H /= 6.f;
if (H < 0) {
H++;
}
}
return H;
}
/**
* Return primary and secondary colors from the Material color palette that are similar to {@param
* color}.
*/
public MaterialPalette calculatePrimaryAndSecondaryColor(int color) {
Trace.beginSection("calculatePrimaryAndSecondaryColor");
final float colorHue = hue(color);
float minimumDistance = Float.MAX_VALUE;
int indexBestMatch = 0;
for (int i = 0; i < sPrimaryColors.length(); i++) {
final int primaryColor = sPrimaryColors.getColor(i, 0);
final float comparedHue = hue(primaryColor);
// No need to be perceptually accurate when calculating color distances since
// we are only mapping to 15 colors. Being slightly inaccurate isn't going to change
// the mapping very often.
final float distance = Math.abs(comparedHue - colorHue);
if (distance < minimumDistance) {
minimumDistance = distance;
indexBestMatch = i;
}
}
Trace.endSection();
return new MaterialPalette(
sPrimaryColors.getColor(indexBestMatch, 0), sSecondaryColors.getColor(indexBestMatch, 0));
}
public static class MaterialPalette implements Parcelable {
public static final Creator<MaterialPalette> CREATOR =
new Creator<MaterialPalette>() {
@Override
public MaterialPalette createFromParcel(Parcel in) {
return new MaterialPalette(in);
}
@Override
public MaterialPalette[] newArray(int size) {
return new MaterialPalette[size];
}
};
public final int mPrimaryColor;
public final int mSecondaryColor;
public MaterialPalette(int primaryColor, int secondaryColor) {
mPrimaryColor = primaryColor;
mSecondaryColor = secondaryColor;
}
private MaterialPalette(Parcel in) {
mPrimaryColor = in.readInt();
mSecondaryColor = in.readInt();
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj == null) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
MaterialPalette other = (MaterialPalette) obj;
if (mPrimaryColor != other.mPrimaryColor) {
return false;
}
if (mSecondaryColor != other.mSecondaryColor) {
return false;
}
return true;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + mPrimaryColor;
result = prime * result + mSecondaryColor;
return result;
}
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeInt(mPrimaryColor);
dest.writeInt(mSecondaryColor);
}
}
}
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