Split the 'people' emoji spritesheet into multiple chunks.

The aim of this is to help performance by breaking up the single massive
spritesheet into smaller ones. This will limit the amount of data that
needs to be kept in memory to render emoji.

(Hopefully) Fixes #8357

src/org/thoughtcrime/securesms/components/emoji/CompositeEmojiPageModel.java

@@ -0,0 +1,59 @@
+package org.thoughtcrime.securesms.components.emoji;
+
+import android.support.annotation.AttrRes;
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
+
+import com.annimon.stream.Stream;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.LinkedList;
+import java.util.List;
+
+public class CompositeEmojiPageModel implements EmojiPageModel {
+  @AttrRes  private final int         iconAttr;
+  @NonNull  private final EmojiPageModel[] models;
+
+  public CompositeEmojiPageModel(@AttrRes int iconAttr, @NonNull EmojiPageModel... models) {
+    this.iconAttr = iconAttr;
+    this.models   = models;
+  }
+
+  public int getIconAttr() {
+    return iconAttr;
+  }
+
+  @Override
+  public @NonNull List<String> getEmoji() {
+    List<String> emojis = new LinkedList<>();
+    for (EmojiPageModel model : models) {
+      emojis.addAll(model.getEmoji());
+    }
+    return emojis;
+  }
+
+  @Override
+  public @NonNull List<Emoji> getDisplayEmoji() {
+    List<Emoji> emojis = new LinkedList<>();
+    for (EmojiPageModel model : models) {
+      emojis.addAll(model.getDisplayEmoji());
+    }
+    return emojis;
+  }
+
+  @Override
+  public boolean hasSpriteMap() {
+    return false;
+  }
+
+  @Override
+  public @Nullable String getSprite() {
+    return null;
+  }
+
+  @Override
+  public boolean isDynamic() {
+    return false;
+  }
+}

src/org/thoughtcrime/securesms/components/emoji/EmojiDrawer.java

@@ -128,7 +128,7 @@ public class EmojiDrawer extends LinearLayout implements InputView, EmojiSelecti
     this.models = new LinkedList<>();
     this.recentModel = new RecentEmojiPageModel(getContext());
     this.models.add(recentModel);
-    this.models.addAll(EmojiPages.PAGES);
+    this.models.addAll(EmojiPages.DISPLAY_PAGES);
   }
 
   public static class EmojiPagerAdapter extends PagerAdapter

src/org/thoughtcrime/securesms/components/emoji/EmojiProvider.java

@@ -61,7 +61,7 @@ class EmojiProvider {
     this.decodeScale = Math.min(1f, context.getResources().getDimension(R.dimen.emoji_drawer_size) / EMOJI_RAW_HEIGHT);
     this.verticalPad = EMOJI_VERT_PAD * this.decodeScale;
 
-    for (EmojiPageModel page : EmojiPages.PAGES) {
+    for (EmojiPageModel page : EmojiPages.DATA_PAGES) {
       if (page.hasSpriteMap()) {
         EmojiPageBitmap pageBitmap = new EmojiPageBitmap(context, page, decodeScale);
 

src/org/thoughtcrime/securesms/components/emoji/parsing/EmojiPageBitmap.java

@@ -1,7 +1,10 @@
 package org.thoughtcrime.securesms.components.emoji.parsing;
 
+import android.annotation.SuppressLint;
 import android.content.Context;
+import android.content.res.AssetManager;
 import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
 import android.os.AsyncTask;
 import android.support.annotation.NonNull;
 import org.thoughtcrime.securesms.logging.Log;
@@ -11,16 +14,18 @@ import com.bumptech.glide.load.engine.DiskCacheStrategy;
 import org.thoughtcrime.securesms.components.emoji.EmojiPageModel;
 import org.thoughtcrime.securesms.mms.GlideApp;
 import org.thoughtcrime.securesms.util.ListenableFutureTask;
+import org.thoughtcrime.securesms.util.Stopwatch;
 import org.thoughtcrime.securesms.util.Util;
 
 import java.io.IOException;
+import java.io.InputStream;
 import java.lang.ref.SoftReference;
 import java.util.concurrent.Callable;
 import java.util.concurrent.ExecutionException;
 
 public class EmojiPageBitmap {
 
-  private static final String TAG = EmojiPageBitmap.class.getName();
+  private static final String TAG = EmojiPageBitmap.class.getSimpleName();
 
   private final Context        context;
   private final EmojiPageModel model;
@@ -35,6 +40,7 @@ public class EmojiPageBitmap {
     this.decodeScale = decodeScale;
   }
 
+  @SuppressLint("StaticFieldLeak")
   public ListenableFutureTask<Bitmap> get() {
     Util.assertMainThread();
 
@@ -70,27 +76,31 @@ public class EmojiPageBitmap {
   private Bitmap loadPage() throws IOException {
     if (bitmapReference != null && bitmapReference.get() != null) return bitmapReference.get();
 
-    try {
-      Bitmap originalBitmap = GlideApp.with(context.getApplicationContext())
-                                      .asBitmap()
-                                      .load("file:///android_asset/" + model.getSprite())
-                                      .skipMemoryCache(true)
-                                      .diskCacheStrategy(DiskCacheStrategy.NONE)
-                                      .submit()
-                                      .get();
 
-      Bitmap scaledBitmap = Bitmap.createScaledBitmap(originalBitmap, (int)(originalBitmap.getWidth() * decodeScale), (int)(originalBitmap.getHeight() * decodeScale), false);
+    float                 scale        = decodeScale;
+    AssetManager          assetManager = context.getAssets();
+    InputStream           assetStream  = assetManager.open(model.getSprite());
+    BitmapFactory.Options options      = new BitmapFactory.Options();
 
-      bitmapReference = new SoftReference<>(scaledBitmap);
-      Log.i(TAG, "onPageLoaded(" + model.getSprite() + ")");
-      return scaledBitmap;
-    } catch (InterruptedException e) {
-      Log.w(TAG, e);
-      throw new IOException(e);
-    } catch (ExecutionException e) {
-      Log.w(TAG, e);
-      throw new IOException(e);
+    if (Util.isLowMemory(context)) {
+      Log.i(TAG, "Low memory detected. Changing sample size.");
+      options.inSampleSize = 2;
+      scale = decodeScale * 2;
     }
+
+    Stopwatch stopwatch = new Stopwatch(model.getSprite());
+    Bitmap    bitmap    = BitmapFactory.decodeStream(assetStream, null, options);
+    stopwatch.split("decode");
+
+    Bitmap scaledBitmap = Bitmap.createScaledBitmap(bitmap, (int)(bitmap.getWidth() * scale), (int)(bitmap.getHeight() * scale), true);
+    stopwatch.split("scale");
+    stopwatch.stop(TAG);
+
+    bitmapReference = new SoftReference<>(scaledBitmap);
+    Log.i(TAG, "onPageLoaded(" + model.getSprite() + ")  originalByteCount: " + bitmap.getByteCount()
+                                                    + "  scaledByteCount: "   + scaledBitmap.getByteCount()
+                                                    + "  scaledSize: "        + scaledBitmap.getWidth() + "x" + scaledBitmap.getHeight());
+    return scaledBitmap;
   }
 
   @Override