Ensure custom exposure mode is supported

Reviewed-on: #6
Reviewed-by: Ivan Malison <ivanmalison@gmail.com>

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

@@ -72,6 +72,10 @@ class CameraView(context: Context) :
   var zoom: Float = 1f // in "factor"
   var exposure: Double = 1.0
   var orientation: Orientation = Orientation.PORTRAIT
+      set(value) {
+        field = value
+        previewView.orientation = value
+      }
   var enableZoomGesture = false
     set(value) {
       field = value

package/android/src/main/java/com/mrousavy/camera/CameraViewManager.kt

@@ -10,6 +10,7 @@ import com.mrousavy.camera.types.CodeScannerOptions
 import com.mrousavy.camera.types.Orientation
 import com.mrousavy.camera.types.PixelFormat
 import com.mrousavy.camera.types.ResizeMode
+import android.util.Log
 import com.mrousavy.camera.types.Torch
 import com.mrousavy.camera.types.VideoStabilizationMode
 
@@ -182,6 +183,7 @@ class CameraViewManager : ViewGroupManager<CameraView>() {
   fun setOrientation(view: CameraView, orientation: String?) {
     if (orientation != null) {
       val newMode = Orientation.fromUnionValue(orientation)
+      Log.i(TAG, "Orientation set to: $newMode")
       view.orientation = newMode
     } else {
       view.orientation = Orientation.PORTRAIT

package/android/src/main/java/com/mrousavy/camera/core/CameraSession.kt

@@ -312,7 +312,7 @@ class CameraSession(private val context: Context, private val cameraManager: Cam
         enableHdr
       )
       outputs.add(output)
-      // Size is usually landscape, so we flip it here
+
       previewView?.setSurfaceSize(size.width, size.height, deviceDetails.sensorOrientation)
     }
 

package/android/src/main/java/com/mrousavy/camera/core/PreviewView.kt

@@ -36,6 +36,13 @@ class PreviewView(context: Context, callback: SurfaceHolder.Callback) :
         updateLayout()
       }
     }
+  var orientation: Orientation = Orientation.PORTRAIT
+      set(value) {
+        if (field != value) {
+          Log.i(TAG, "View Orientation changed: $field -> $value")
+          field = value
+        }
+      }
   private var inputOrientation: Orientation = Orientation.LANDSCAPE_LEFT
     set(value) {
       if (field != value) {
@@ -101,6 +108,11 @@ class PreviewView(context: Context, callback: SurfaceHolder.Callback) :
   }
 
   private fun getSize(contentSize: Size, containerSize: Size, resizeMode: ResizeMode): Size {
+    var contentSize = contentSize
+    // Swap dimensions if orientation is landscape
+    if (orientation.isLandscape()) {
+      contentSize = Size(contentSize.height, contentSize.width)
+    }
     val contentAspectRatio = contentSize.width.toDouble() / contentSize.height
     val containerAspectRatio = containerSize.width.toDouble() / containerSize.height
     if (!(contentAspectRatio > 0 && containerAspectRatio > 0)) {
@@ -128,11 +140,11 @@ class PreviewView(context: Context, callback: SurfaceHolder.Callback) :
   override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
     super.onMeasure(widthMeasureSpec, heightMeasureSpec)
 
-    val viewSize = Size(MeasureSpec.getSize(widthMeasureSpec), MeasureSpec.getSize(heightMeasureSpec))
+    val measuredViewSize = Size(MeasureSpec.getSize(widthMeasureSpec), MeasureSpec.getSize(heightMeasureSpec))
     val surfaceSize = size.rotatedBy(inputOrientation)
-    val fittedSize = getSize(surfaceSize, viewSize, resizeMode)
+    val fittedSize = getSize(surfaceSize, measuredViewSize, resizeMode)
 
-    Log.i(TAG, "PreviewView is $viewSize, rendering $surfaceSize content ($inputOrientation). Resizing to: $fittedSize ($resizeMode)")
+    Log.i(TAG, "PreviewView is $measuredViewSize rendering $surfaceSize orientation ($orientation). Resizing to: $fittedSize ($resizeMode)")
     setMeasuredDimension(fittedSize.width, fittedSize.height)
   }
 

package/ios/CameraView+RecordVideo.swift

@@ -50,4 +50,12 @@ extension CameraView: AVCaptureVideoDataOutputSampleBufferDelegate, AVCaptureAud
   func resumeRecording(promise: Promise) {
     cameraSession.resumeRecording(promise: promise)
   }
+  
+  func lockExposure(promise: Promise) {
+    cameraSession.lockCurrentExposure(promise: promise)
+  }
+  
+  func unlockExposure(promise: Promise) {
+    cameraSession.unlockCurrentExposure(promise: promise)
+  }
 }

package/ios/CameraViewManager.m

@@ -86,5 +86,13 @@ RCT_EXTERN_METHOD(focus
                   : (NSDictionary*)point resolve
                   : (RCTPromiseResolveBlock)resolve reject
                   : (RCTPromiseRejectBlock)reject);
+RCT_EXTERN_METHOD(lockCurrentExposure
+                  : (nonnull NSNumber*)node resolve
+                  : (RCTPromiseResolveBlock)resolve reject
+                  : (RCTPromiseRejectBlock)reject);
+RCT_EXTERN_METHOD(unlockCurrentExposure
+                  : (nonnull NSNumber*)node resolve
+                  : (RCTPromiseResolveBlock)resolve reject
+                  : (RCTPromiseRejectBlock)reject);
 
 @end

package/ios/CameraViewManager.swift

@@ -110,6 +110,18 @@ final class CameraViewManager: RCTViewManager {
       resolve(result.descriptor)
     }
   }
+  
+  @objc
+  final func lockCurrentExposure(_ node: NSNumber, resolve: @escaping RCTPromiseResolveBlock, reject: @escaping RCTPromiseRejectBlock) {
+    let component = getCameraView(withTag: node)
+    component.lockExposure(promise: Promise(resolver: resolve, rejecter: reject))
+  }
+  
+  @objc
+  final func unlockCurrentExposure(_ node: NSNumber, resolve: @escaping RCTPromiseResolveBlock, reject: @escaping RCTPromiseRejectBlock) {
+    let component = getCameraView(withTag: node)
+    component.unlockExposure(promise: Promise(resolver: resolve, rejecter: reject))
+  }
 
   // MARK: Private
 

package/ios/Core/CameraSession+Video.swift

@@ -34,7 +34,7 @@ extension CameraSession {
       }
 
       let enableAudio = self.configuration?.audio != .disabled
-      
+
       // Callback for when new chunks are ready
       let onChunkReady: (ChunkedRecorder.Chunk) -> Void = { chunk in
         guard let delegate = self.delegate else {
@@ -191,4 +191,68 @@ extension CameraSession {
       }
     }
   }
+
+  func lockCurrentExposure(promise: Promise) {
+    CameraQueues.cameraQueue.async {
+      withPromise(promise) {
+        guard let captureDevice = AVCaptureDevice.default(for: .video) else {
+          print("No capture device available")
+          return
+        }
+
+        guard captureDevice.isExposureModeSupported(.custom) else {
+          ReactLogger.log(level: .info, message: "Custom exposure mode not supported")
+          return
+        }
+        do {
+          // Lock the device for configuration
+          try captureDevice.lockForConfiguration()
+
+          // Get the current exposure duration and ISO
+          let currentExposureDuration = captureDevice.exposureDuration
+          let currentISO = captureDevice.iso
+
+          // Check if the device supports custom exposure settings
+          if captureDevice.isExposureModeSupported(.custom) {
+            // Lock the current exposure and ISO by setting custom exposure mode
+            captureDevice.setExposureModeCustom(duration: currentExposureDuration, iso: currentISO, completionHandler: nil)
+            ReactLogger.log(level: .info, message: "Exposure and ISO locked at current values")
+          } else {
+            ReactLogger.log(level: .info, message:"Custom exposure mode not supported")
+          }
+
+          // Unlock the device after configuration
+          captureDevice.unlockForConfiguration()
+
+        } catch {
+          ReactLogger.log(level: .warning, message:"Error locking exposure: \(error)")
+        }
+
+        return nil
+      }
+    }
+  }
+
+  func unlockCurrentExposure(promise: Promise) {
+    CameraQueues.cameraQueue.async {
+      withPromise(promise) {
+        guard let captureDevice = AVCaptureDevice.default(for: .video) else {
+          print("No capture device available")
+          return
+        }
+
+        do {
+          if captureDevice.isExposureModeSupported(.autoExpose) {
+            try captureDevice.lockForConfiguration()
+            captureDevice.exposureMode = .continuousAutoExposure
+            captureDevice.unlockForConfiguration()
+          }
+        } catch {
+          ReactLogger.log(level: .warning, message:"Error unlocking exposure: \(error)")
+        }
+
+        return nil
+      }
+    }
+  }
 }

package/src/Camera.tsx

@@ -319,6 +319,22 @@ export class Camera extends React.PureComponent<CameraProps, CameraState> {
       throw tryParseNativeCameraError(e)
     }
   }
+
+  public async lockCurrentExposure(): Promise<void> {
+    try {
+      return await CameraModule.lockCurrentExposure(this.handle)
+    } catch (e) {
+      throw tryParseNativeCameraError(e)
+    }
+  }
+
+  public async unlockCurrentExposure(): Promise<void> {
+    try {
+      return await CameraModule.unlockCurrentExposure(this.handle)
+    } catch (e) {
+      throw tryParseNativeCameraError(e)
+    }
+  }
   //#endregion
 
   //#region Static Functions (NativeModule)