| /* |
| * 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; |
| |
| 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); |
| } |
| |
| /** |
| * 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); |
| } |
| } |
| } |