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/*
* Copyright (C) 2014 The CyanogenMod 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.cyanogenmod.eleven.utils;
import android.graphics.Bitmap;
import android.graphics.Color;
import android.os.Looper;
import android.support.v7.graphics.Palette;
import android.support.v7.graphics.Target;
import android.util.LruCache;
public class BitmapWithColors {
private static final class BitmapColors {
public final int mVibrantColor;
public final int mVibrantDarkColor;
public final int mVibrantLightColor;
public final int mDominantColor;
public BitmapColors(Palette palette) {
mVibrantColor = determineColor(palette.getVibrantSwatch());
mVibrantDarkColor = determineColor(palette.getDarkVibrantSwatch());
mVibrantLightColor = determineColor(palette.getLightVibrantSwatch());
mDominantColor = determineColor(getDominantSwatch(palette));
}
public BitmapColors(int vibrantColor, int vibrantDarkColor) {
mVibrantColor = vibrantColor;
mVibrantDarkColor = vibrantDarkColor;
mVibrantLightColor = Color.TRANSPARENT;
mDominantColor = vibrantColor;
}
private int determineColor(Palette.Swatch swatch) {
return swatch != null ? swatch.getRgb() : Color.TRANSPARENT;
}
private static Palette.Swatch getDominantSwatch(Palette palette) {
Palette.Swatch dominant = null;
for (Palette.Swatch swatch : palette.getSwatches()) {
if (dominant == null || swatch.getPopulation() > dominant.getPopulation()) {
dominant = swatch;
}
}
return dominant;
}
}
private static final int CACHE_SIZE_MAX = 20;
private static final LruCache<Integer, BitmapColors> sCachedColors =
new LruCache<Integer, BitmapColors>(CACHE_SIZE_MAX);
private Bitmap mBitmap;
private int mBitmapKey;
private BitmapColors mColors;
public BitmapWithColors(Bitmap bitmap, int bitmapKey) {
mBitmap = bitmap;
mBitmapKey = bitmapKey;
if (Thread.currentThread() != Looper.getMainLooper().getThread()) {
// we're already running in background, so do the
// (costly) palette initialization immediately
loadColorsIfNeeded();
}
}
public BitmapWithColors(Bitmap bitmap, int bitmapKey, int vibrantColor, int vibrantDarkColor) {
mBitmap = bitmap;
mBitmapKey = bitmapKey;
mColors = new BitmapColors(vibrantColor, vibrantDarkColor);
}
public Bitmap getBitmap() {
return mBitmap;
}
public int getVibrantColor() {
loadColorsIfNeeded();
if (mColors.mVibrantColor == Color.TRANSPARENT) {
return mColors.mVibrantDarkColor;
}
return mColors.mVibrantColor;
}
public int getVibrantDarkColor() {
loadColorsIfNeeded();
if (mColors.mVibrantDarkColor == Color.TRANSPARENT) {
return mColors.mVibrantColor;
}
return mColors.mVibrantDarkColor;
}
public int getContrastingColor() {
loadColorsIfNeeded();
float contrastToDark = computeContrastBetweenColors(mColors.mDominantColor,
mColors.mVibrantDarkColor);
float contrastToLight = computeContrastBetweenColors(mColors.mDominantColor,
mColors.mVibrantLightColor);
float contrastToVibrant = computeContrastBetweenColors(mColors.mDominantColor,
mColors.mVibrantColor);
int bestColor = mColors.mDominantColor;
float bestContrast = -1;
if (contrastToVibrant > bestContrast) {
bestColor = mColors.mVibrantColor;
bestContrast = contrastToVibrant;
}
if (contrastToDark > bestContrast) {
bestColor = mColors.mVibrantDarkColor;
bestContrast = contrastToDark;
}
if (contrastToLight > bestContrast) {
bestColor = mColors.mVibrantLightColor;
bestContrast = contrastToLight;
}
return bestColor;
}
/** Calculates the constrast between two colors, using the algorithm provided by the WCAG v2. */
private static float computeContrastBetweenColors(int bg, int fg) {
if (bg == Color.TRANSPARENT || fg == Color.TRANSPARENT || bg == fg) {
return -1;
}
float bgR = Color.red(bg) / 255f;
float bgG = Color.green(bg) / 255f;
float bgB = Color.blue(bg) / 255f;
bgR = (bgR < 0.03928f) ? bgR / 12.92f : (float) Math.pow((bgR + 0.055f) / 1.055f, 2.4f);
bgG = (bgG < 0.03928f) ? bgG / 12.92f : (float) Math.pow((bgG + 0.055f) / 1.055f, 2.4f);
bgB = (bgB < 0.03928f) ? bgB / 12.92f : (float) Math.pow((bgB + 0.055f) / 1.055f, 2.4f);
float bgL = 0.2126f * bgR + 0.7152f * bgG + 0.0722f * bgB;
float fgR = Color.red(fg) / 255f;
float fgG = Color.green(fg) / 255f;
float fgB = Color.blue(fg) / 255f;
fgR = (fgR < 0.03928f) ? fgR / 12.92f : (float) Math.pow((fgR + 0.055f) / 1.055f, 2.4f);
fgG = (fgG < 0.03928f) ? fgG / 12.92f : (float) Math.pow((fgG + 0.055f) / 1.055f, 2.4f);
fgB = (fgB < 0.03928f) ? fgB / 12.92f : (float) Math.pow((fgB + 0.055f) / 1.055f, 2.4f);
float fgL = 0.2126f * fgR + 0.7152f * fgG + 0.0722f * fgB;
return Math.abs((fgL + 0.05f) / (bgL + 0.05f));
}
private synchronized void loadColorsIfNeeded() {
if (mColors != null) {
return;
}
synchronized (sCachedColors) {
mColors = sCachedColors.get(mBitmapKey);
}
if (mColors != null) {
return;
}
final Palette p = Palette.from(mBitmap)
.clearTargets()
.addTarget(Target.VIBRANT)
.addTarget(Target.LIGHT_VIBRANT)
.addTarget(Target.DARK_VIBRANT)
.generate();
if (p == null) {
return;
}
mColors = new BitmapColors(p);
synchronized (sCachedColors) {
sCachedColors.put(mBitmapKey, mColors);
}
}
}
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