From 79be10428b589bd6dc75644705b71b10d9405ba9 Mon Sep 17 00:00:00 2001
From: Denis Koroskin <dkoroskin@fb.com>
Date: Sun, 20 Dec 2015 19:36:23 -0800
Subject: [PATCH] Add support for ViewProps.NEEDS_OFFSCREEN_ALPHA_COMPOSITING
 to RCTView

Summary: Copied from ReactViewManager. Should provide performance improvements.

Reviewed By: ahmedre

Differential Revision: D2772832
---
 .../com/facebook/react/flat/FlatViewGroup.java  | 17 +++++++++++++++++
 .../com/facebook/react/flat/RCTViewManager.java |  7 +++++++
 2 files changed, 24 insertions(+)

diff --git a/ReactAndroid/src/main/java/com/facebook/react/flat/FlatViewGroup.java b/ReactAndroid/src/main/java/com/facebook/react/flat/FlatViewGroup.java
index 27e4e2896a6..d369f1e21c5 100644
--- a/ReactAndroid/src/main/java/com/facebook/react/flat/FlatViewGroup.java
+++ b/ReactAndroid/src/main/java/com/facebook/react/flat/FlatViewGroup.java
@@ -57,6 +57,7 @@ import com.facebook.react.uimanager.ReactCompoundView;
   private int mDrawChildIndex = 0;
   private boolean mIsAttached = false;
   private boolean mIsLayoutRequested = false;
+  private boolean mNeedsOffscreenAlphaCompositing = false;
   private Drawable mHotspot;
 
   /* package */ FlatViewGroup(Context context) {
@@ -179,6 +180,22 @@ import com.facebook.react.uimanager.ReactCompoundView;
     }
   }
 
+  /**
+   * We override this to allow developers to determine whether they need offscreen alpha compositing
+   * or not. See the documentation of needsOffscreenAlphaCompositing in View.js.
+   */
+  @Override
+  public boolean hasOverlappingRendering() {
+    return mNeedsOffscreenAlphaCompositing;
+  }
+
+  /**
+   * See the documentation of needsOffscreenAlphaCompositing in View.js.
+   */
+  /* package */ void setNeedsOffscreenAlphaCompositing(boolean needsOffscreenAlphaCompositing) {
+    mNeedsOffscreenAlphaCompositing = needsOffscreenAlphaCompositing;
+  }
+
   /* package */ void setHotspot(Drawable hotspot) {
     if (mHotspot != null) {
       mHotspot.setCallback(null);
diff --git a/ReactAndroid/src/main/java/com/facebook/react/flat/RCTViewManager.java b/ReactAndroid/src/main/java/com/facebook/react/flat/RCTViewManager.java
index aa57fa51b25..2b29b4f457c 100644
--- a/ReactAndroid/src/main/java/com/facebook/react/flat/RCTViewManager.java
+++ b/ReactAndroid/src/main/java/com/facebook/react/flat/RCTViewManager.java
@@ -90,4 +90,11 @@ import com.facebook.react.views.view.ReactDrawableHelper;
       }
     }
   }
+
+  @ReactProp(name = ViewProps.NEEDS_OFFSCREEN_ALPHA_COMPOSITING)
+  public void setNeedsOffscreenAlphaCompositing(
+      FlatViewGroup view,
+      boolean needsOffscreenAlphaCompositing) {
+    view.setNeedsOffscreenAlphaCompositing(needsOffscreenAlphaCompositing);
+  }
 }