getOrientationFromBytes

flexing/src/main/java/net/bradmartin/flexing/images.kt

@@ -2,12 +2,45 @@ package net.bradmartin.flexing
 
 import android.graphics.Bitmap
 import android.graphics.drawable.BitmapDrawable
+import android.hardware.camera2.CameraMetadata
+import android.support.media.ExifInterface
+import android.util.Log
 import android.widget.ImageView
+import java.io.ByteArrayInputStream
+import java.io.IOException
+
+const val TAG = "Flexing.Images"
 
 fun getBitmapFromImageView(value: ImageView): Bitmap {
     // if not instance of ImageView throw an exception
     if (value !is ImageView) throw IllegalArgumentException("Value passed to getBitmapFromImageView is not of type ImageView")
 
     val drawable = value.drawable as BitmapDrawable
     return drawable.bitmap
+}
+
+/**
+ * Returns the exif data from the camera byte array
+ */
+fun getOrientationFromBytes(data: ByteArray, cameraId: Int): Int {
+    val inputStream = ByteArrayInputStream(data)
+    val exif = android.support.media.ExifInterface(inputStream)
+    var orientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_UNDEFINED)
+
+    try {
+        inputStream.close()
+    } catch (error: IOException) {
+        Log.e(TAG, "Error closing ByteArrayInputStream $error")
+    }
+
+    if (cameraId == CameraMetadata.LENS_FACING_BACK) {
+        when (orientation) {
+            ExifInterface.ORIENTATION_NORMAL -> orientation = ExifInterface.ORIENTATION_FLIP_HORIZONTAL
+            ExifInterface.ORIENTATION_ROTATE_180 -> orientation = ExifInterface.ORIENTATION_FLIP_VERTICAL
+            ExifInterface.ORIENTATION_ROTATE_90 -> orientation = ExifInterface.ORIENTATION_TRANSVERSE
+        }
+    }
+
+    Log.i(TAG, "Orientation $orientation")
+    return orientation
 }