remove setPixel/getPixel entirely from transformBitmap to address crash

Reviewed-on: #22

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

@@ -235,10 +235,19 @@ class PersistentCameraCaptureSession(private val cameraManager: CameraManager, p
 
       // 1. Run a precapture sequence for AF, AE and AWB.
       focusJob = coroutineScope.launch {
+        try {
           val request = repeatingRequest.createCaptureRequest(device, deviceDetails, outputs)
           val options =
             PrecaptureOptions(listOf(PrecaptureTrigger.AF, PrecaptureTrigger.AE), Flash.OFF, listOf(point), false, FOCUS_RESET_TIMEOUT)
           session.precapture(request, deviceDetails, options)
+        } catch (e: CaptureTimedOutError) {
+          // Focus timed out - this is non-fatal, just log and continue
+          Log.w(TAG, "Focus timed out at point $point, continuing without focus lock")
+        } catch (e: IllegalStateException) {
+          Log.w(TAG, "Focus failed, camera device was already closed: ${e.message}")
+        } catch (e: CameraAccessException) {
+          Log.w(TAG, "Focus failed, camera not accessible: ${e.message}")
+        }
       }
       focusJob?.join()
 
@@ -254,9 +263,15 @@ class PersistentCameraCaptureSession(private val cameraManager: CameraManager, p
           return@launch
         }
         Log.i(TAG, "Resetting focus to auto-focus...")
+        try {
           repeatingRequest.createCaptureRequest(device, deviceDetails, outputs).also { request ->
             session.setRepeatingRequest(request.build(), null, null)
           }
+        } catch (e: IllegalStateException) {
+          Log.w(TAG, "Failed to reset focus, camera device was already closed: ${e.message}")
+        } catch (e: CameraAccessException) {
+          Log.w(TAG, "Failed to reset focus, camera not accessible: ${e.message}")
+        }
       }
     }
   }

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

@@ -5,7 +5,7 @@ import android.content.Context
 import android.content.res.Configuration
 import android.graphics.Point
 import android.os.Handler
-import android.os.Looper
+import android.os.HandlerThread
 import android.util.Log
 import android.util.Size
 import android.view.PixelCopy
@@ -25,58 +25,72 @@ import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.suspendCancellableCoroutine
 import kotlinx.coroutines.withContext
 import android.graphics.Bitmap
-import android.graphics.Matrix
-
-fun rotateBitmap90CounterClockwise(source: Bitmap): Bitmap {
-    val width = source.width
-    val height = source.height
-
-    // Create a new Bitmap with swapped width and height
-    val rotatedBitmap = Bitmap.createBitmap(height, width, source.config ?: Bitmap.Config.ARGB_8888)
-
-    for (y in 0 until height) {
-        for (x in 0 until width) {
-            // Set the pixel in the new position
-            rotatedBitmap.setPixel(y, width - 1 - x, source.getPixel(x, y))
-        }
-    }
-
-    return rotatedBitmap
-}
-
 
 fun Bitmap.transformBitmap(orientation: Orientation): Bitmap {
     return when (orientation) {
         Orientation.PORTRAIT -> this // No transformation needed
         Orientation.LANDSCAPE_LEFT -> {
-            // Transpose (swap width and height)
-            val transposedBitmap = Bitmap.createBitmap(height, width, config ?: Bitmap.Config.ARGB_8888)
-            for (y in 0 until height) {
-                for (x in 0 until width) {
-                    transposedBitmap.setPixel(y, width - 1 - x, getPixel(x, y))
+            val srcWidth = width
+            val srcHeight = height
+            val sourcePixels = IntArray(srcWidth * srcHeight)
+            getPixels(sourcePixels, 0, srcWidth, 0, 0, srcWidth, srcHeight)
+
+            val dstWidth = srcHeight
+            val dstHeight = srcWidth
+            val destinationPixels = IntArray(dstWidth * dstHeight)
+            for (y in 0 until srcHeight) {
+                for (x in 0 until srcWidth) {
+                    val dstX = y
+                    val dstY = srcWidth - 1 - x
+                    destinationPixels[dstY * dstWidth + dstX] = sourcePixels[y * srcWidth + x]
                 }
             }
-            transposedBitmap
+
+            val transformedBitmap = Bitmap.createBitmap(dstWidth, dstHeight, config ?: Bitmap.Config.ARGB_8888)
+            transformedBitmap.setPixels(destinationPixels, 0, dstWidth, 0, 0, dstWidth, dstHeight)
+            transformedBitmap
         }
         Orientation.PORTRAIT_UPSIDE_DOWN -> {
-            // Invert vertically and horizontally (180-degree rotation)
-            val invertedBitmap = Bitmap.createBitmap(width, height, config ?: Bitmap.Config.ARGB_8888)
-            for (y in 0 until height) {
-                for (x in 0 until width) {
-                    invertedBitmap.setPixel(width - 1 - x, height - 1 - y, getPixel(x, y))
+            val srcWidth = width
+            val srcHeight = height
+            val sourcePixels = IntArray(srcWidth * srcHeight)
+            getPixels(sourcePixels, 0, srcWidth, 0, 0, srcWidth, srcHeight)
+
+            val dstWidth = srcWidth
+            val dstHeight = srcHeight
+            val destinationPixels = IntArray(dstWidth * dstHeight)
+            for (y in 0 until srcHeight) {
+                for (x in 0 until srcWidth) {
+                    val dstX = srcWidth - 1 - x
+                    val dstY = srcHeight - 1 - y
+                    destinationPixels[dstY * dstWidth + dstX] = sourcePixels[y * srcWidth + x]
                 }
             }
-            invertedBitmap
+
+            val transformedBitmap = Bitmap.createBitmap(dstWidth, dstHeight, config ?: Bitmap.Config.ARGB_8888)
+            transformedBitmap.setPixels(destinationPixels, 0, dstWidth, 0, 0, dstWidth, dstHeight)
+            transformedBitmap
         }
         Orientation.LANDSCAPE_RIGHT -> {
-            // Transpose (swap width and height) and invert vertically
-            val transposedBitmap = Bitmap.createBitmap(height, width, config ?: Bitmap.Config.ARGB_8888)
-            for (y in 0 until height) {
-                for (x in 0 until width) {
-                    transposedBitmap.setPixel(height - 1 - y, x, getPixel(x, y))
+            val srcWidth = width
+            val srcHeight = height
+            val sourcePixels = IntArray(srcWidth * srcHeight)
+            getPixels(sourcePixels, 0, srcWidth, 0, 0, srcWidth, srcHeight)
+
+            val dstWidth = srcHeight
+            val dstHeight = srcWidth
+            val destinationPixels = IntArray(dstWidth * dstHeight)
+            for (y in 0 until srcHeight) {
+                for (x in 0 until srcWidth) {
+                    val dstX = srcHeight - 1 - y
+                    val dstY = x
+                    destinationPixels[dstY * dstWidth + dstX] = sourcePixels[y * srcWidth + x]
                 }
             }
-            transposedBitmap
+
+            val transformedBitmap = Bitmap.createBitmap(dstWidth, dstHeight, config ?: Bitmap.Config.ARGB_8888)
+            transformedBitmap.setPixels(destinationPixels, 0, dstWidth, 0, 0, dstWidth, dstHeight)
+            transformedBitmap
         }
     }
 }
@@ -186,7 +200,7 @@ class PreviewView(context: Context, callback: SurfaceHolder.Callback) :
             )
           }
         },
-        Handler(Looper.getMainLooper())
+        pixelCopyHandler
     )
     }
   }
@@ -198,8 +212,10 @@ class PreviewView(context: Context, callback: SurfaceHolder.Callback) :
     val viewOrientation = Orientation.PORTRAIT
 
     val rotated = point.rotatedBy(viewSize, cameraSize, viewOrientation, sensorOrientation)
-    Log.i(TAG, "Converted layer point $point to camera point $rotated! ($sensorOrientation, $cameraSize -> $viewSize)")
-    return rotated
+    // Clamp to valid camera coordinates (must be non-negative for MeteringRectangle)
+    val clamped = Point(maxOf(0, rotated.x), maxOf(0, rotated.y))
+    Log.i(TAG, "Converted layer point $point to camera point $clamped! ($sensorOrientation, $cameraSize -> $viewSize)")
+    return clamped
   }
 
   private fun updateLayout() {
@@ -254,5 +270,10 @@ class PreviewView(context: Context, callback: SurfaceHolder.Callback) :
 
   companion object {
     private const val TAG = "PreviewView"
+    private val pixelCopyHandler: Handler by lazy {
+      val handlerThread = HandlerThread("VisionCamera.PixelCopy")
+      handlerThread.start()
+      Handler(handlerThread.looper)
+    }
   }
 }