/*
* 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.internal.util;
import android.content.Context;
import android.content.res.ColorStateList;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.Color;
import android.graphics.drawable.AnimationDrawable;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.VectorDrawable;
import android.text.SpannableStringBuilder;
import android.text.Spanned;
import android.text.style.TextAppearanceSpan;
import android.util.Log;
import android.util.Pair;
import java.util.Arrays;
import java.util.WeakHashMap;
/**
* Helper class to process legacy (Holo) notifications to make them look like material notifications.
*
* @hide
*/
public class NotificationColorUtil {
private static final String TAG = "NotificationColorUtil";
private static final Object sLock = new Object();
private static NotificationColorUtil sInstance;
private final ImageUtils mImageUtils = new ImageUtils();
private final WeakHashMap<Bitmap, Pair<Boolean, Integer>> mGrayscaleBitmapCache =
new WeakHashMap<Bitmap, Pair<Boolean, Integer>>();
private final int mGrayscaleIconMaxSize; // @dimen/notification_large_icon_width (64dp)
public static NotificationColorUtil getInstance(Context context) {
synchronized (sLock) {
if (sInstance == null) {
sInstance = new NotificationColorUtil(context);
}
return sInstance;
}
}
private NotificationColorUtil(Context context) {
mGrayscaleIconMaxSize = context.getResources().getDimensionPixelSize(
com.android.internal.R.dimen.notification_large_icon_width);
}
/**
* Checks whether a Bitmap is a small grayscale icon.
* Grayscale here means "very close to a perfect gray"; icon means "no larger than 64dp".
*
* @param bitmap The bitmap to test.
* @return True if the bitmap is grayscale; false if it is color or too large to examine.
*/
public boolean isGrayscaleIcon(Bitmap bitmap) {
// quick test: reject large bitmaps
if (bitmap.getWidth() > mGrayscaleIconMaxSize
|| bitmap.getHeight() > mGrayscaleIconMaxSize) {
return false;
}
synchronized (sLock) {
Pair<Boolean, Integer> cached = mGrayscaleBitmapCache.get(bitmap);
if (cached != null) {
if (cached.second == bitmap.getGenerationId()) {
return cached.first;
}
}
}
boolean result;
int generationId;
synchronized (mImageUtils) {
result = mImageUtils.isGrayscale(bitmap);
// generationId and the check whether the Bitmap is grayscale can't be read atomically
// here. However, since the thread is in the process of posting the notification, we can
// assume that it doesn't modify the bitmap while we are checking the pixels.
generationId = bitmap.getGenerationId();
}
synchronized (sLock) {
mGrayscaleBitmapCache.put(bitmap, Pair.create(result, generationId));
}
return result;
}
/**
* Checks whether a Drawable is a small grayscale icon.
* Grayscale here means "very close to a perfect gray"; icon means "no larger than 64dp".
*
* @param d The drawable to test.
* @return True if the bitmap is grayscale; false if it is color or too large to examine.
*/
public boolean isGrayscaleIcon(Drawable d) {
if (d == null) {
return false;
} else if (d instanceof BitmapDrawable) {
BitmapDrawable bd = (BitmapDrawable) d;
return bd.getBitmap() != null && isGrayscaleIcon(bd.getBitmap());
} else if (d instanceof AnimationDrawable) {
AnimationDrawable ad = (AnimationDrawable) d;
int count = ad.getNumberOfFrames();
return count > 0 && isGrayscaleIcon(ad.getFrame(0));
} else if (d instanceof VectorDrawable) {
// We just assume you're doing the right thing if using vectors
return true;
} else {
return false;
}
}
/**
* Checks whether a drawable with a resoure id is a small grayscale icon.
* Grayscale here means "very close to a perfect gray"; icon means "no larger than 64dp".
*
* @param context The context to load the drawable from.
* @return True if the bitmap is grayscale; false if it is color or too large to examine.
*/
public boolean isGrayscaleIcon(Context context, int drawableResId) {
if (drawableResId != 0) {
try {
return isGrayscaleIcon(context.getDrawable(drawableResId));
} catch (Resources.NotFoundException ex) {
Log.e(TAG, "Drawable not found: " + drawableResId);
return false;
}
} else {
return false;
}
}
/**
* Inverts all the grayscale colors set by {@link android.text.style.TextAppearanceSpan}s on
* the text.
*
* @param charSequence The text to process.
* @return The color inverted text.
*/
public CharSequence invertCharSequenceColors(CharSequence charSequence) {
if (charSequence instanceof Spanned) {
Spanned ss = (Spanned) charSequence;
Object[] spans = ss.getSpans(0, ss.length(), Object.class);
SpannableStringBuilder builder = new SpannableStringBuilder(ss.toString());
for (Object span : spans) {
Object resultSpan = span;
if (span instanceof TextAppearanceSpan) {
resultSpan = processTextAppearanceSpan((TextAppearanceSpan) span);
}
builder.setSpan(resultSpan, ss.getSpanStart(span), ss.getSpanEnd(span),
ss.getSpanFlags(span));
}
return builder;
}
return charSequence;
}
private TextAppearanceSpan processTextAppearanceSpan(TextAppearanceSpan span) {
ColorStateList colorStateList = span.getTextColor();
if (colorStateList != null) {
int[] colors = colorStateList.getColors();
boolean changed = false;
for (int i = 0; i < colors.length; i++) {
if (ImageUtils.isGrayscale(colors[i])) {
// Allocate a new array so we don't change the colors in the old color state
// list.
if (!changed) {
colors = Arrays.copyOf(colors, colors.length);
}
colors[i] = processColor(colors[i]);
changed = true;
}
}
if (changed) {
return new TextAppearanceSpan(
span.getFamily(), span.getTextStyle(), span.getTextSize(),
new ColorStateList(colorStateList.getStates(), colors),
span.getLinkTextColor());
}
}
return span;
}
private int processColor(int color) {
return Color.argb(Color.alpha(color),
255 - Color.red(color),
255 - Color.green(color),
255 - Color.blue(color));
}
}
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