content: /*
   * Copyright (C) 2016 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.launcher3.dynamicui;
  
  import android.annotation.TargetApi;
  import android.app.WallpaperManager;
  import android.app.job.JobParameters;
  import android.app.job.JobService;
  import android.graphics.Bitmap;
  import android.graphics.BitmapFactory;
  import android.graphics.BitmapRegionDecoder;
  import android.graphics.Rect;
  import android.graphics.drawable.BitmapDrawable;
  import android.os.Build;
  import android.os.Bundle;
  import android.os.Handler;
  import android.os.HandlerThread;
  import android.os.ParcelFileDescriptor;
  import android.support.v7.graphics.Palette;
  import android.util.Log;
  
  import com.android.launcher3.LauncherProvider;
  import com.android.launcher3.LauncherSettings;
  import com.android.launcher3.R;
  import com.android.launcher3.Utilities;
  import com.android.launcher3.config.FeatureFlags;
  
  import java.io.IOException;
  
  /**
   * Extracts colors from the wallpaper, and saves results to {@link LauncherProvider}.
   */
  public class ColorExtractionService extends JobService {
  
      private static final String TAG = "ColorExtractionService";
      private static final boolean DEBUG = false;
  
      /** The fraction of the wallpaper to extract colors for use on the hotseat. */
      private static final float HOTSEAT_FRACTION = 1f / 4;
  
      private HandlerThread mWorkerThread;
      private Handler mWorkerHandler;
  
      @Override
      public void onCreate() {
          super.onCreate();
          mWorkerThread = new HandlerThread("ColorExtractionService");
          mWorkerThread.start();
          mWorkerHandler = new Handler(mWorkerThread.getLooper());
      }
  
      @Override
      public void onDestroy() {
          super.onDestroy();
          mWorkerThread.quit();
      }
  
      @Override
      public boolean onStartJob(final JobParameters jobParameters) {
          if (DEBUG) Log.d(TAG, "onStartJob");
          mWorkerHandler.post(new Runnable() {
              @Override
              public void run() {
                  WallpaperManager wallpaperManager = WallpaperManager.getInstance(
                          ColorExtractionService.this);
                  int wallpaperId = ExtractionUtils.getWallpaperId(wallpaperManager);
  
                  ExtractedColors extractedColors = new ExtractedColors();
                  if (wallpaperManager.getWallpaperInfo() != null) {
                      // We can't extract colors from live wallpapers; always use the default color.
                      extractedColors.updateHotseatPalette(null);
  
                      if (FeatureFlags.QSB_IN_HOTSEAT || FeatureFlags.LAUNCHER3_GRADIENT_ALL_APPS) {
                          extractedColors.updateWallpaperThemePalette(null);
                      }
                  } else {
                      // We extract colors for the hotseat and status bar separately,
                      // since they only consider part of the wallpaper.
                      extractedColors.updateHotseatPalette(getHotseatPalette());
  
                      if (FeatureFlags.LIGHT_STATUS_BAR) {
                          extractedColors.updateStatusBarPalette(getStatusBarPalette());
                      }
  
                      if (FeatureFlags.QSB_IN_HOTSEAT || FeatureFlags.LAUNCHER3_GRADIENT_ALL_APPS) {
                          extractedColors.updateWallpaperThemePalette(getWallpaperPalette());
                      }
                  }
  
                  // Save the extracted colors and wallpaper id to LauncherProvider.
                  String colorsString = extractedColors.encodeAsString();
                  Bundle extras = new Bundle();
                  extras.putInt(LauncherSettings.Settings.EXTRA_WALLPAPER_ID, wallpaperId);
                  extras.putString(LauncherSettings.Settings.EXTRA_EXTRACTED_COLORS, colorsString);
                  getContentResolver().call(
                          LauncherSettings.Settings.CONTENT_URI,
                          LauncherSettings.Settings.METHOD_SET_EXTRACTED_COLORS_AND_WALLPAPER_ID,
                          null, extras);
                  jobFinished(jobParameters, false /* needsReschedule */);
                  if (DEBUG) Log.d(TAG, "job finished!");
              }
          });
          return true;
      }
  
      @Override
      public boolean onStopJob(JobParameters jobParameters) {
          if (DEBUG) Log.d(TAG, "onStopJob");
          mWorkerHandler.removeCallbacksAndMessages(null);
          return true;
      }
  
      @TargetApi(Build.VERSION_CODES.N)
      private Palette getHotseatPalette() {
          WallpaperManager wallpaperManager = WallpaperManager.getInstance(this);
          if (Utilities.ATLEAST_NOUGAT) {
              try (ParcelFileDescriptor fd = wallpaperManager
                      .getWallpaperFile(WallpaperManager.FLAG_SYSTEM)) {
                  BitmapRegionDecoder decoder = BitmapRegionDecoder
                          .newInstance(fd.getFileDescriptor(), false);
                  int height = decoder.getHeight();
                  Rect decodeRegion = new Rect(0, (int) (height * (1f - HOTSEAT_FRACTION)),
                          decoder.getWidth(), height);
                  Bitmap bitmap = decoder.decodeRegion(decodeRegion, null);
                  decoder.recycle();
                  if (bitmap != null) {
                      return Palette.from(bitmap).clearFilters().generate();
                  }
              } catch (IOException | NullPointerException e) {
                  Log.e(TAG, "Fetching partial bitmap failed, trying old method", e);
              }
          }
  
          Bitmap wallpaper = ((BitmapDrawable) wallpaperManager.getDrawable()).getBitmap();
          return Palette.from(wallpaper)
                  .setRegion(0, (int) (wallpaper.getHeight() * (1f - HOTSEAT_FRACTION)),
                          wallpaper.getWidth(), wallpaper.getHeight())
                  .clearFilters()
                  .generate();
      }
  
      @TargetApi(Build.VERSION_CODES.N)
      private Palette getStatusBarPalette() {
          WallpaperManager wallpaperManager = WallpaperManager.getInstance(this);
          int statusBarHeight = getResources()
                  .getDimensionPixelSize(R.dimen.status_bar_height);
  
          if (Utilities.ATLEAST_NOUGAT) {
              try (ParcelFileDescriptor fd = wallpaperManager
                      .getWallpaperFile(WallpaperManager.FLAG_SYSTEM)) {
                  BitmapRegionDecoder decoder = BitmapRegionDecoder
                          .newInstance(fd.getFileDescriptor(), false);
                  Rect decodeRegion = new Rect(0, 0,
                          decoder.getWidth(), statusBarHeight);
                  Bitmap bitmap = decoder.decodeRegion(decodeRegion, null);
                  decoder.recycle();
                  if (bitmap != null) {
                      return Palette.from(bitmap).clearFilters().generate();
                  }
              } catch (IOException | NullPointerException e) {
                  Log.e(TAG, "Fetching partial bitmap failed, trying old method", e);
              }
          }
  
          Bitmap wallpaper = ((BitmapDrawable) wallpaperManager.getDrawable()).getBitmap();
          return Palette.from(wallpaper)
                  .setRegion(0, 0, wallpaper.getWidth(), statusBarHeight)
                  .clearFilters()
                  .generate();
      }
  
      @TargetApi(Build.VERSION_CODES.N)
      private Palette getWallpaperPalette() {
          WallpaperManager wallpaperManager = WallpaperManager.getInstance(this);
          if (Utilities.ATLEAST_NOUGAT) {
              try (ParcelFileDescriptor fd = wallpaperManager
                      .getWallpaperFile(WallpaperManager.FLAG_SYSTEM)) {
                  Bitmap bitmap = BitmapFactory.decodeFileDescriptor(fd.getFileDescriptor());
                  if (bitmap != null) {
                      return Palette.from(bitmap).clearFilters().generate();
                  }
              } catch (IOException | NullPointerException e) {
                  Log.e(TAG, "Fetching partial bitmap failed, trying old method", e);
              }
          }
  
          Bitmap wallpaper = ((BitmapDrawable) wallpaperManager.getDrawable()).getBitmap();
          return Palette.from(wallpaper).clearFilters().generate();
      }
  }
  