Move enableDrawablePreAllocation to ComponentsConfiguration data class

Summary:
This diff moves the static `enableDrawablePreAllocation` to inside the values of the `ComponentsConfiguration`.

This will allow us to enable this at the `ComponentTree` level and do testing at the surface level (which I aim to do in the StoriesViewer).

Reviewed By: larrytjok

Differential Revision: D52958863

fbshipit-source-id: 4065795bd10490fe1e77c6ffde27e1b41c06a784

Author: Fabio Carballo

litho-core/src/main/java/com/facebook/litho/LayoutState.java

@@ -159,6 +159,7 @@ public static boolean isFromSyncLayout(@RenderSource int source) {
   private boolean mIsCommitted;
 
   private boolean mShouldProcessVisibilityOutputs;
+  private boolean mEnableDrawablePreallocation;
 
   LayoutState(
       int id,
@@ -173,6 +174,8 @@ public static boolean isFromSyncLayout(@RenderSource int source) {
       ReductionState reductionState) {
     mId = id;
     mResolveResult = resolveResult;
+    mEnableDrawablePreallocation =
+        mResolveResult.context.mLithoConfiguration.componentsConfig.enableDrawablePreAllocation;
     mSizeConstraints = sizeConstraints;
     mRootX = rootX;
     mRootY = rootY;
@@ -339,8 +342,7 @@ void preAllocateMountContent(boolean shouldPreallocatePerMountSpec) {
           continue;
         }
 
-        if (ComponentsConfiguration.enableDrawablePreAllocation
-            || isMountableView(treeNode.getRenderUnit())) {
+        if (mEnableDrawablePreallocation || isMountableView(treeNode.getRenderUnit())) {
 
           boolean preallocated =
               MountItemsPool.maybePreallocateContent(
@@ -349,7 +351,7 @@ void preAllocateMountContent(boolean shouldPreallocatePerMountSpec) {
 
           Log.d(
               "LayoutState",
-              "Preallocation of"
+              "Preallocation of "
                   + component.getSimpleName()
                   + (preallocated ? " succeeded" : " failed"));
         }

litho-core/src/main/java/com/facebook/litho/config/ComponentsConfiguration.kt

@@ -75,7 +75,12 @@ internal constructor(
      * every state update in a small time window. This has been proven to be an overall improvement
      * for performance so it's highly advised to not disable it.
      */
-    @JvmField val enableStateUpdatesBatching: Boolean = true
+    @JvmField val enableStateUpdatesBatching: Boolean = true,
+    /**
+     * By default, we do not allow preallocation of [Drawable]. By turning this option on, you can
+     * also preallocate [Drawable] mount content, when [mountContentPreallocation] is enabled.
+     */
+    @JvmField val enableDrawablePreAllocation: Boolean = false
 ) {
 
   val shouldAddRootHostViewOrDisableBgFgOutputs: Boolean =
@@ -151,7 +156,6 @@ internal constructor(
     @JvmField var enableThreadTracingStacktrace: Boolean = false
 
     @JvmField var runLooperPrepareForLayoutThreadFactory: Boolean = true
-    @JvmField var enableDrawablePreAllocation: Boolean = false
 
     @JvmField var perfBoosterFactory: LithoPerfBoosterFactory? = null
 
@@ -239,6 +243,7 @@ internal constructor(
     private var shouldEnableDefaultAOSPLithoLifecycleProvider =
         baseConfig.shouldEnableDefaultAOSPLithoLifecycleProvider
     private var enableStateUpdatesBatching = baseConfig.enableStateUpdatesBatching
+    private var enableDrawablePreAllocation = baseConfig.enableDrawablePreAllocation
 
     fun shouldAddHostViewForRootComponent(enabled: Boolean) = also {
       shouldAddHostViewForRootComponent = enabled
@@ -280,6 +285,10 @@ internal constructor(
       enableStateUpdatesBatching = enabled
     }
 
+    fun enableDrawablePreAllocation(enabled: Boolean): Builder = also {
+      enableDrawablePreAllocation = enabled
+    }
+
     fun build(): ComponentsConfiguration {
       return baseConfig.copy(
           specsApiStateUpdateDuplicateDetectionEnabled =
@@ -293,7 +302,8 @@ internal constructor(
           componentHostRecyclingEnabled = componentHostRecyclingEnabled,
           shouldEnableDefaultAOSPLithoLifecycleProvider =
               shouldEnableDefaultAOSPLithoLifecycleProvider,
-          enableStateUpdatesBatching = enableStateUpdatesBatching)
+          enableStateUpdatesBatching = enableStateUpdatesBatching,
+          enableDrawablePreAllocation = enableDrawablePreAllocation)
     }
   }
 }