| /* |
| * 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 quantum 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>>(); |
| |
| public static NotificationColorUtil getInstance() { |
| synchronized (sLock) { |
| if (sInstance == null) { |
| sInstance = new NotificationColorUtil(); |
| } |
| return sInstance; |
| } |
| } |
| |
| /** |
| * Checks whether a bitmap is grayscale. Grayscale here means "very close to a perfect |
| * gray". |
| * |
| * @param bitmap The bitmap to test. |
| * @return Whether the bitmap is grayscale. |
| */ |
| public boolean isGrayscale(Bitmap bitmap) { |
| 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 grayscale. Grayscale here means "very close to a perfect |
| * gray". |
| * |
| * @param d The drawable to test. |
| * @return Whether the drawable is grayscale. |
| */ |
| public boolean isGrayscale(Drawable d) { |
| if (d == null) { |
| return false; |
| } else if (d instanceof BitmapDrawable) { |
| BitmapDrawable bd = (BitmapDrawable) d; |
| return bd.getBitmap() != null && isGrayscale(bd.getBitmap()); |
| } else if (d instanceof AnimationDrawable) { |
| AnimationDrawable ad = (AnimationDrawable) d; |
| int count = ad.getNumberOfFrames(); |
| return count > 0 && isGrayscale(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 grayscale. Grayscale here means "very close |
| * to a perfect gray". |
| * |
| * @param context The context to load the drawable from. |
| * @return Whether the drawable is grayscale. |
| */ |
| public boolean isGrayscale(Context context, int drawableResId) { |
| if (drawableResId != 0) { |
| try { |
| return isGrayscale(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)); |
| } |
| } |