Drastically reduce number of projection instances we create.

Via SimplePool

app/src/main/java/org/thoughtcrime/securesms/conversation/ConversationAdapter.java

@@ -57,6 +57,7 @@ import org.thoughtcrime.securesms.util.CachedInflater;
 import org.thoughtcrime.securesms.util.DateUtils;
 import org.thoughtcrime.securesms.util.MessageRecordUtil;
 import org.thoughtcrime.securesms.util.Projection;
+import org.thoughtcrime.securesms.util.ProjectionList;
 import org.thoughtcrime.securesms.util.StickyHeaderDecoration;
 import org.thoughtcrime.securesms.util.ThemeUtil;
 import org.thoughtcrime.securesms.util.ViewUtil;
@@ -704,7 +705,7 @@ public class ConversationAdapter
     }
 
     @Override
-    public @NonNull List<Projection> getColorizerProjections(@NonNull ViewGroup coordinateRoot) {
+    public @NonNull ProjectionList getColorizerProjections(@NonNull ViewGroup coordinateRoot) {
       return getBindable().getColorizerProjections(coordinateRoot);
     }
   }

app/src/main/java/org/thoughtcrime/securesms/conversation/ConversationItem.java

@@ -122,6 +122,7 @@ import org.thoughtcrime.securesms.util.InterceptableLongClickCopyLinkSpan;
 import org.thoughtcrime.securesms.util.LongClickMovementMethod;
 import org.thoughtcrime.securesms.util.MessageRecordUtil;
 import org.thoughtcrime.securesms.util.Projection;
+import org.thoughtcrime.securesms.util.ProjectionList;
 import org.thoughtcrime.securesms.util.SearchUtil;
 import org.thoughtcrime.securesms.util.StringUtil;
 import org.thoughtcrime.securesms.util.ThemeUtil;
@@ -221,6 +222,7 @@ public final class ConversationItem extends RelativeLayout implements BindableCo
   private Colorizer          colorizer;
   private boolean            hasWallpaper;
   private float              lastYDownRelativeToThis;
+  private ProjectionList     colorizerProjections = new ProjectionList(3);
 
   public ConversationItem(Context context) {
     this(context, null);
@@ -530,6 +532,10 @@ public final class ConversationItem extends RelativeLayout implements BindableCo
     if (conversationRecipient != null) {
       conversationRecipient.removeForeverObserver(this);
     }
+
+    bodyBubble.setVideoPlayerProjection(null);
+    bodyBubble.setQuoteViewProjection(null);
+
     cancelPulseOutlinerAnimation();
   }
 
@@ -588,12 +594,17 @@ public final class ConversationItem extends RelativeLayout implements BindableCo
   }
 
   private static int getProjectionTop(@NonNull View child) {
-    return (int) Projection.relativeToViewRoot(child, null).getY();
+    Projection projection = Projection.relativeToViewRoot(child, null);
+    int y = (int) projection.getY();
+    projection.release();
+    return y;
   }
 
   private static int getProjectionBottom(@NonNull View child) {
     Projection projection = Projection.relativeToViewRoot(child, null);
-    return (int) projection.getY() + projection.getHeight();
+    int bottom = (int) projection.getY() + projection.getHeight();
+    projection.release();
+    return bottom;
   }
 
   @Override
@@ -1719,8 +1730,8 @@ public final class ConversationItem extends RelativeLayout implements BindableCo
   }
 
   @Override
-  public @NonNull List<Projection> getColorizerProjections(@NonNull ViewGroup coordinateRoot) {
-    List<Projection> projections = new LinkedList<>();
+  public @NonNull ProjectionList getColorizerProjections(@NonNull ViewGroup coordinateRoot) {
+    colorizerProjections.clear();
 
     if (messageRecord.isOutgoing()      &&
         !hasNoBubble(messageRecord)     &&
@@ -1731,9 +1742,9 @@ public final class ConversationItem extends RelativeLayout implements BindableCo
       Projection videoToBubble    = bodyBubble.getVideoPlayerProjection();
       if (videoToBubble != null) {
         Projection videoToRoot = Projection.translateFromDescendantToParentCoords(videoToBubble, bodyBubble, coordinateRoot);
-        projections.addAll(Projection.getCapAndTail(bodyBubbleToRoot, videoToRoot));
+        colorizerProjections.addAll(Projection.getCapAndTail(bodyBubbleToRoot, videoToRoot));
       } else {
-        projections.add(bodyBubbleToRoot);
+        colorizerProjections.add(bodyBubbleToRoot);
       }
     }
 
@@ -1743,7 +1754,7 @@ public final class ConversationItem extends RelativeLayout implements BindableCo
     {
       Projection footerProjection = getActiveFooter(messageRecord).getProjection(coordinateRoot);
       if (footerProjection != null) {
-        projections.add(footerProjection.translateX(bodyBubble.getTranslationX()));
+        colorizerProjections.add(footerProjection.translateX(bodyBubble.getTranslationX()));
       }
     }
 
@@ -1752,10 +1763,14 @@ public final class ConversationItem extends RelativeLayout implements BindableCo
         quoteView != null)
     {
       bodyBubble.setQuoteViewProjection(quoteView.getProjection(bodyBubble));
-      projections.add(quoteView.getProjection(coordinateRoot).translateX(bodyBubble.getTranslationX() + this.getTranslationX()));
+      colorizerProjections.add(quoteView.getProjection(coordinateRoot).translateX(bodyBubble.getTranslationX() + this.getTranslationX()));
     }
 
-    return projections.stream().map(p -> p.translateY(this.getTranslationY())).collect(Collectors.toList());
+    for (int i = 0; i < colorizerProjections.size(); i++) {
+      colorizerProjections.get(i).translateY(getTranslationY());
+    }
+
+    return colorizerProjections;
   }
 
   @Override

app/src/main/java/org/thoughtcrime/securesms/conversation/ConversationItemBodyBubble.java

@@ -63,11 +63,19 @@ public class ConversationItemBodyBubble extends LinearLayout {
   }
 
   public void setQuoteViewProjection(@Nullable Projection quoteViewProjection) {
+    if (this.quoteViewProjection != null) {
+      this.quoteViewProjection.release();
+    }
+
     this.quoteViewProjection = quoteViewProjection;
     clipProjectionDrawable.setProjections(getProjections());
   }
 
   public void setVideoPlayerProjection(@Nullable Projection videoPlayerProjection) {
+    if (this.videoPlayerProjection != null) {
+      this.videoPlayerProjection.release();
+    }
+
     this.videoPlayerProjection = videoPlayerProjection;
     clipProjectionDrawable.setProjections(getProjections());
   }

app/src/main/java/org/thoughtcrime/securesms/conversation/ConversationUpdateItem.java

@@ -39,6 +39,7 @@ import org.thoughtcrime.securesms.recipients.Recipient;
 import org.thoughtcrime.securesms.util.DateUtils;
 import org.thoughtcrime.securesms.util.IdentityUtil;
 import org.thoughtcrime.securesms.util.Projection;
+import org.thoughtcrime.securesms.util.ProjectionList;
 import org.thoughtcrime.securesms.util.TextSecurePreferences;
 import org.thoughtcrime.securesms.util.ThemeUtil;
 import org.thoughtcrime.securesms.util.Util;
@@ -59,7 +60,9 @@ import java.util.concurrent.ExecutionException;
 public final class ConversationUpdateItem extends FrameLayout
                                           implements BindableConversationItem
 {
-  private static final String TAG = Log.tag(ConversationUpdateItem.class);
+  private static final String         TAG                   = Log.tag(ConversationUpdateItem.class);
+  private static final ProjectionList EMPTY_PROJECTION_LIST = new ProjectionList();
+
 
   private Set<MultiselectPart> batchSelected;
 
@@ -221,8 +224,8 @@ public final class ConversationUpdateItem extends FrameLayout
   }
 
   @Override
-  public @NonNull List<Projection> getColorizerProjections(@NonNull ViewGroup coordinateRoot) {
-    return Collections.emptyList();
+  public @NonNull ProjectionList getColorizerProjections(@NonNull ViewGroup coordinateRoot) {
+    return EMPTY_PROJECTION_LIST;
   }
 
   @Override

app/src/main/java/org/thoughtcrime/securesms/conversation/colors/Colorizable.kt

@@ -1,12 +1,12 @@
 package org.thoughtcrime.securesms.conversation.colors
 
 import android.view.ViewGroup
-import org.thoughtcrime.securesms.util.Projection
+import org.thoughtcrime.securesms.util.ProjectionList
 
 /**
  * Denotes that a class can be colorized. The class is responsible for
  * generating its own projection.
  */
 interface Colorizable {
-  fun getColorizerProjections(coordinateRoot: ViewGroup): List<Projection>
+  fun getColorizerProjections(coordinateRoot: ViewGroup): ProjectionList
 }

app/src/main/java/org/thoughtcrime/securesms/conversation/colors/ColorizerView.kt

@@ -40,4 +40,9 @@ class ColorizerView @JvmOverloads constructor(
       super.draw(canvas)
     }
   }
+
+  override fun onDetachedFromWindow() {
+    super.onDetachedFromWindow()
+    projections.forEach { it.release() }
+  }
 }

app/src/main/java/org/thoughtcrime/securesms/conversation/colors/RecyclerViewColorizer.kt

@@ -98,8 +98,10 @@ class RecyclerViewColorizer(private val recyclerView: RecyclerView) {
         if (child != null) {
           val holder = parent.getChildViewHolder(child)
           if (holder is Colorizable) {
-            holder.getColorizerProjections(parent).forEach {
-              c.drawPath(it.path, holePunchPaint)
+            holder.getColorizerProjections(parent).use { list ->
+              list.forEach {
+                c.drawPath(it.path, holePunchPaint)
+              }
             }
           }
         }

app/src/main/java/org/thoughtcrime/securesms/conversation/mutiselect/MultiselectItemDecoration.kt

@@ -21,7 +21,6 @@ import androidx.recyclerview.widget.RecyclerView
 import com.airbnb.lottie.SimpleColorFilter
 import org.thoughtcrime.securesms.R
 import org.thoughtcrime.securesms.conversation.ConversationAdapter
-import org.thoughtcrime.securesms.util.Projection
 import org.thoughtcrime.securesms.util.SetUtil
 import org.thoughtcrime.securesms.util.ThemeUtil
 import org.thoughtcrime.securesms.util.ViewUtil
@@ -157,9 +156,17 @@ class MultiselectItemDecoration(
 
       val parts: MultiselectCollection = child.conversationMessage.multiselectCollection
 
-      val projections: List<Projection> = child.getColorizerProjections(parent) + if (child.canPlayContent()) listOf(child.getGiphyMp4PlayableProjection(parent)) else emptyList()
+      val projections = child.getColorizerProjections(parent)
+      if (child.canPlayContent()) {
+        projections.add(child.getGiphyMp4PlayableProjection(parent))
+      }
+
       path.reset()
-      projections.forEach { it.applyToPath(path) }
+      projections.use { list ->
+        list.forEach {
+          it.applyToPath(path)
+        }
+      }
 
       canvas.save()
       canvas.clipPath(path, Region.Op.DIFFERENCE)
@@ -341,13 +348,16 @@ class MultiselectItemDecoration(
       parent.forEach { child ->
         if (child is Multiselectable && child.conversationMessage == inFocus.conversationMessage) {
           path.addRect(child.left.toFloat(), child.top.toFloat(), child.right.toFloat(), child.bottom.toFloat(), Path.Direction.CW)
-          child.getColorizerProjections(parent).forEach {
-            path.op(it.path, Path.Op.DIFFERENCE)
+          child.getColorizerProjections(parent).use { list ->
+            list.forEach {
+              path.op(it.path, Path.Op.DIFFERENCE)
+            }
           }
 
           if (child.canPlayContent()) {
             val mp4GifProjection = child.getGiphyMp4PlayableProjection(child.rootView as ViewGroup)
             path.op(mp4GifProjection.path, Path.Op.DIFFERENCE)
+            mp4GifProjection.release()
           }
         }
       }

app/src/main/java/org/thoughtcrime/securesms/giph/mp4/GiphyMp4ProjectionRecycler.java

@@ -105,6 +105,8 @@ public final class GiphyMp4ProjectionRecycler implements GiphyMp4PlaybackControl
     }
 
     holder.setCorners(projection.getCorners());
+
+    projection.release();
   }
 
   private void startPlayback(@NonNull RecyclerView parent, @NonNull GiphyMp4ProjectionPlayerHolder holder, @NonNull GiphyMp4Playable giphyMp4Playable) {

app/src/main/java/org/thoughtcrime/securesms/messagedetails/MessageHeaderViewHolder.java

@@ -35,6 +35,7 @@ import org.thoughtcrime.securesms.sms.MessageSender;
 import org.thoughtcrime.securesms.util.DateUtils;
 import org.thoughtcrime.securesms.util.ExpirationUtil;
 import org.thoughtcrime.securesms.util.Projection;
+import org.thoughtcrime.securesms.util.ProjectionList;
 import org.whispersystems.libsignal.util.guava.Optional;
 
 import java.sql.Date;
@@ -250,7 +251,7 @@ final class MessageHeaderViewHolder extends RecyclerView.ViewHolder implements G
   }
 
   @Override
-  public @NonNull List<Projection> getColorizerProjections(@NonNull ViewGroup coordinateRoot) {
+  public @NonNull ProjectionList getColorizerProjections(@NonNull ViewGroup coordinateRoot) {
     return conversationItem.getColorizerProjections(coordinateRoot);
   }
 

app/src/main/java/org/thoughtcrime/securesms/util/Projection.java

@@ -9,6 +9,7 @@ import android.view.ViewGroup;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
+import androidx.core.util.Pools;
 import androidx.recyclerview.widget.RecyclerView;
 
 import org.signal.core.util.logging.Log;
@@ -24,30 +25,41 @@ import java.util.Objects;
  */
 public final class Projection {
 
-  private final float   x;
-  private final float   y;
-  private final int     width;
-  private final int     height;
-  private final Corners corners;
-  private final Path    path;
-  private final RectF   rect;
+  private float   x;
+  private float   y;
+  private int     width;
+  private int     height;
+  private Corners corners;
+  private Path    path;
+  private RectF   rect;
 
-  public Projection(float x, float y, int width, int height, @Nullable Corners corners) {
+  private Projection() {
+    x       = 0f;
+    y       = 0f;
+    width   = 0;
+    height  = 0;
+    corners = null;
+    path    = new Path();
+    rect    = new RectF();
+  }
+
+  private Projection set(float x, float y, int width, int height, @Nullable Corners corners) {
     this.x       = x;
     this.y       = y;
     this.width   = width;
     this.height  = height;
     this.corners = corners;
-    this.path    = new Path();
 
-    rect = new RectF();
     rect.set(x, y, x + width, y + height);
+    path.reset();
 
     if (corners != null) {
       path.addRoundRect(rect, corners.toRadii(), Path.Direction.CW);
     } else {
       path.addRect(rect, Path.Direction.CW);
     }
+
+    return this;
   }
 
   public float getX() {
@@ -86,35 +98,12 @@ public final class Projection {
     }
   }
 
-  @Override public boolean equals(Object o) {
-    if (this == o) return true;
-    if (o == null || getClass() != o.getClass()) return false;
-    final Projection that = (Projection) o;
-    return Float.compare(that.x, x) == 0 &&
-           Float.compare(that.y, y) == 0 &&
-           width == that.width &&
-           height == that.height &&
-           Objects.equals(corners, that.corners);
-  }
-
-  @Override public int hashCode() {
-    return Objects.hash(x, y, width, height, corners);
-  }
-
   public @NonNull Projection translateX(float xTranslation) {
-    return new Projection(x + xTranslation, y, width, height, corners);
+    return set(x + xTranslation, y, width, height, corners);
   }
 
   public @NonNull Projection translateY(float yTranslation) {
-    return new Projection(x, y + yTranslation, width, height, corners);
-  }
-
-  public @NonNull Projection withDimensions(int width, int height) {
-    return new Projection(x, y, width, height, corners);
-  }
-
-  public @NonNull Projection withHeight(int height) {
-    return new Projection(x, y, width, height, corners);
+    return set(x, y + yTranslation, width, height, corners);
   }
 
   public static @NonNull Projection relativeToParent(@NonNull ViewGroup parent, @NonNull View view, @Nullable Corners corners) {
@@ -122,7 +111,7 @@ public final class Projection {
 
     view.getDrawingRect(viewBounds);
     parent.offsetDescendantRectToMyCoords(view, viewBounds);
-    return new Projection(viewBounds.left, viewBounds.top, view.getWidth(), view.getHeight(), corners);
+    return acquireAndSet(viewBounds.left, viewBounds.top, view.getWidth(), view.getHeight(), corners);
   }
 
   public static @NonNull Projection relativeToViewRoot(@NonNull View view, @Nullable Corners corners) {
@@ -132,7 +121,7 @@ public final class Projection {
     view.getDrawingRect(viewBounds);
     root.offsetDescendantRectToMyCoords(view, viewBounds);
 
-    return new Projection(viewBounds.left, viewBounds.top, view.getWidth(), view.getHeight(), corners);
+    return acquireAndSet(viewBounds.left, viewBounds.top, view.getWidth(), view.getHeight(), corners);
   }
 
   public static @NonNull Projection relativeToViewWithCommonRoot(@NonNull View toProject, @NonNull View viewWithCommonRoot, @Nullable Corners corners) {
@@ -143,7 +132,7 @@ public final class Projection {
     root.offsetDescendantRectToMyCoords(toProject, viewBounds);
     root.offsetRectIntoDescendantCoords(viewWithCommonRoot, viewBounds);
 
-    return new Projection(viewBounds.left, viewBounds.top, toProject.getWidth(), toProject.getHeight(), corners);
+    return acquireAndSet(viewBounds.left, viewBounds.top, toProject.getWidth(), toProject.getHeight(), corners);
   }
 
   public static @NonNull Projection translateFromDescendantToParentCoords(@NonNull Projection descendantProjection, @NonNull View descendant, @NonNull ViewGroup parent) {
@@ -153,7 +142,7 @@ public final class Projection {
 
     parent.offsetDescendantRectToMyCoords(descendant, viewBounds);
 
-    return new Projection(viewBounds.left, viewBounds.top, descendantProjection.width, descendantProjection.height, descendantProjection.corners);
+    return acquireAndSet(viewBounds.left, viewBounds.top, descendantProjection.width, descendantProjection.height, descendantProjection.corners);
   }
 
   public static @NonNull List<Projection> getCapAndTail(@NonNull Projection parentProjection, @NonNull Projection childProjection) {
@@ -187,11 +176,47 @@ public final class Projection {
     }
 
     return Arrays.asList(
-        new Projection(topX, topY, topWidth, topHeight, topCorners),
-        new Projection(bottomX, bottomY, bottomWidth, bottomHeight, bottomCorners)
+        acquireAndSet(topX, topY, topWidth, topHeight, topCorners),
+        acquireAndSet(bottomX, bottomY, bottomWidth, bottomHeight, bottomCorners)
     );
   }
 
+  /**
+   * We keep a maximum of 125 Projections around at any one time.
+   */
+  private static final Pools.SimplePool<Projection> projectionPool = new Pools.SimplePool<>(125);
+
+  /**
+   * Acquire a projection. This will try to grab one from the pool, and, upon failure, will
+   * allocate a new one instead.
+   */
+  private static @NonNull Projection acquire() {
+    Projection fromPool = projectionPool.acquire();
+    if (fromPool != null) {
+      return fromPool;
+    } else {
+      return new Projection();
+    }
+  }
+
+  /**
+   * Acquire a projection and set its fields as specified.
+   */
+  private static @NonNull Projection acquireAndSet(float x, float y, int width, int height, @Nullable Corners corners) {
+    Projection projection = acquire();
+    projection.set(x, y, width, height, corners);
+
+    return projection;
+  }
+
+  /**
+   * Projections should only be kept around for the absolute maximum amount of time they are needed.
+   */
+  public void release() {
+    projectionPool.release(this);
+  }
+
+
   public static final class Corners {
     private final float topLeft;
     private final float topRight;

app/src/main/java/org/thoughtcrime/securesms/util/ProjectionList.kt

@@ -0,0 +1,9 @@
+package org.thoughtcrime.securesms.util
+
+import java.io.Closeable
+
+class ProjectionList(size: Int = 0) : ArrayList<Projection>(size), Closeable {
+  override fun close() {
+    forEach { it.release() }
+  }
+}