feat: Make Reanimated optional (disable Frame Processors if REA v2 is not installed) (#412)

* Fix building iOS without Reanimated

* Conditionally compile Frame Processors (gradle)

* Conditionally use externalNativeBuild

* Remove Reanimated import

* fix: Conditionally load REA/VisionCamera libraries

* fix: Add disable FP to docs

* fix: Fix dummy placeholder for Scheduler.mm

* fix: Fix dummy `Scheduler` declaration

* fix: Only init `CameraView` C++ side if frame processors are enabled

* fix: Install JSI Bindings on Frame Processor Manager ctor

* fix: Wrong conditional

* whoops

android/src/main/java/com/mrousavy/camera/CameraView.kt

@@ -26,6 +26,7 @@ import com.facebook.proguard.annotations.DoNotStrip
 import com.facebook.react.bridge.*
 import com.facebook.react.uimanager.events.RCTEventEmitter
 import com.mrousavy.camera.frameprocessor.FrameProcessorPerformanceDataCollector
+import com.mrousavy.camera.frameprocessor.FrameProcessorRuntimeManager
 import com.mrousavy.camera.utils.*
 import kotlinx.coroutines.*
 import kotlinx.coroutines.guava.await
@@ -159,7 +160,7 @@ class CameraView(context: Context, private val frameProcessorThread: ExecutorSer
     }
 
   @DoNotStrip
-  private var mHybridData: HybridData
+  private var mHybridData: HybridData? = null
 
   @Suppress("LiftReturnOrAssignment", "RedundantIf")
   internal val fallbackToSnapshot: Boolean
@@ -192,7 +193,9 @@ class CameraView(context: Context, private val frameProcessorThread: ExecutorSer
     }
 
   init {
-    mHybridData = initHybrid()
+    if (FrameProcessorRuntimeManager.enableFrameProcessors) {
+      mHybridData = initHybrid()
+    }
 
     previewView = PreviewView(context)
     previewView.layoutParams = LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT)

android/src/main/java/com/mrousavy/camera/CameraViewModule.kt

@@ -57,10 +57,6 @@ class CameraViewModule(reactContext: ReactApplicationContext) : ReactContextBase
     if (frameProcessorManager == null) {
       frameProcessorThread.execute {
         frameProcessorManager = FrameProcessorRuntimeManager(reactApplicationContext, frameProcessorThread)
-
-        reactApplicationContext.runOnJSQueueThread {
-          frameProcessorManager!!.installJSIBindings()
-        }
       }
     }
   }

android/src/main/java/com/mrousavy/camera/frameprocessor/FrameProcessorRuntimeManager.kt

@@ -8,7 +8,6 @@ import com.facebook.react.bridge.ReactApplicationContext
 import com.facebook.react.turbomodule.core.CallInvokerHolderImpl
 import com.mrousavy.camera.CameraView
 import com.mrousavy.camera.ViewNotFoundError
-import com.swmansion.reanimated.Scheduler
 import java.lang.ref.WeakReference
 import java.util.concurrent.ExecutorService
 
@@ -17,39 +16,52 @@ class FrameProcessorRuntimeManager(context: ReactApplicationContext, frameProces
   companion object {
     const val TAG = "FrameProcessorRuntime"
     val Plugins: ArrayList<FrameProcessorPlugin> = ArrayList()
+    var enableFrameProcessors = true
 
     init {
-      System.loadLibrary("reanimated")
-      System.loadLibrary("VisionCamera")
+      try {
+        System.loadLibrary("reanimated")
+        System.loadLibrary("VisionCamera")
+      } catch (e: UnsatisfiedLinkError) {
+        Log.w(TAG, "Failed to load Reanimated/VisionCamera C++ library. Frame Processors are disabled!")
+        enableFrameProcessors = false
+      }
     }
   }
 
   @DoNotStrip
-  private var mHybridData: HybridData
-  private var mContext: WeakReference<ReactApplicationContext>
-  private var mScheduler: VisionCameraScheduler
+  private var mHybridData: HybridData? = null
+  private var mContext: WeakReference<ReactApplicationContext>? = null
+  private var mScheduler: VisionCameraScheduler? = null
 
   init {
-    val holder = context.catalystInstance.jsCallInvokerHolder as CallInvokerHolderImpl
-    mScheduler = VisionCameraScheduler(frameProcessorThread)
-    mContext = WeakReference(context)
-    mHybridData = initHybrid(context.javaScriptContextHolder.get(), holder, mScheduler)
-    initializeRuntime()
+    if (enableFrameProcessors) {
+      val holder = context.catalystInstance.jsCallInvokerHolder as CallInvokerHolderImpl
+      mScheduler = VisionCameraScheduler(frameProcessorThread)
+      mContext = WeakReference(context)
+      mHybridData = initHybrid(context.javaScriptContextHolder.get(), holder, mScheduler!!)
+      initializeRuntime()
 
-    Log.i(TAG, "Installing Frame Processor Plugins...")
-    Plugins.forEach { plugin ->
-      registerPlugin(plugin)
+      Log.i(TAG, "Installing Frame Processor Plugins...")
+      Plugins.forEach { plugin ->
+        registerPlugin(plugin)
+      }
+      Log.i(TAG, "Successfully installed ${Plugins.count()} Frame Processor Plugins!")
+
+      Log.i(TAG, "Installing JSI Bindings on JS Thread...")
+      context.runOnJSQueueThread {
+        installJSIBindings()
+      }
     }
-    Log.i(TAG, "Successfully installed ${Plugins.count()} Frame Processor Plugins!")
   }
 
   @Suppress("unused")
   @DoNotStrip
   @Keep
   fun findCameraViewById(viewId: Int): CameraView {
-    Log.d(TAG, "finding view $viewId...")
-    val view = mContext.get()?.currentActivity?.findViewById<CameraView>(viewId)
-    Log.d(TAG, "found view $viewId! is null: ${view == null}")
+    Log.d(TAG, "Finding view $viewId...")
+    val view = mContext?.get()?.currentActivity?.findViewById<CameraView>(viewId)
+    Log.d(TAG,  if (view != null) "Found view $viewId!" else "Couldn't find view $viewId!")
     return view ?: throw ViewNotFoundError(viewId)
   }
 
@@ -61,7 +73,5 @@ class FrameProcessorRuntimeManager(context: ReactApplicationContext, frameProces
   ): HybridData
   private external fun initializeRuntime()
   private external fun registerPlugin(plugin: FrameProcessorPlugin)
-
-  // public C++ funcs
-  external fun installJSIBindings()
+  private external fun installJSIBindings()
 }