Fix: rotation on some android devices

README.md

@@ -99,6 +99,7 @@ The promise resolves with an object containing: `path`, `uri`, `name`, `size` (b
 # Limitations
 
 - If you are using `@react-native-camera-roll/camera-roll` **with new architecture enabled this library is not going to work**. If you try to display an image with the `uri` of the library using `<Image />` you are going to have the following error: `No suitable image URL loader found for ph://...`. This error come from the ReactNative `ImageLoader`, which is the one we are currently using. Help/PR for solving this are welcome. Until then, we recommend using `react-native-image-picker`.
+- Image EXIF orientation are correctly handled on Android only, But not yet on IOS [#402](https://github.com/bamlab/react-native-image-resizer/issues/402).
 
 ## 👉 About Bam
 

android/src/main/java/com/reactnativeimageresizer/ImageResizer.java

@@ -189,12 +189,11 @@ private static Bitmap resizeImage(Bitmap image, int newWidth, int newHeight,
   /**
    * Rotate the specified bitmap with the given angle, in degrees.
    */
-  public static Bitmap rotateImage(Bitmap source, float angle)
+  public static Bitmap rotateImage(Bitmap source, Matrix matrix, float angle)
   {
     Bitmap retVal;
-
-    Matrix matrix = new Matrix();
     matrix.postRotate(angle);
+
     try {
       retVal = Bitmap.createBitmap(source, 0, 0, source.getWidth(), source.getHeight(), matrix, true);
     } catch (OutOfMemoryError e) {
@@ -316,39 +315,57 @@ public static boolean copyExif(Context context, Uri imageUri, String dstPath){
   /**
    * Get orientation by reading Image metadata
    */
-  public static int getOrientation(Context context, Uri uri) {
+  public static Matrix getOrientationMatrix(Context context, Uri uri) {
     try {
       // ExifInterface(InputStream) only exists since Android N (r24)
       if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
         InputStream input = context.getContentResolver().openInputStream(uri);
         ExifInterface ei = new ExifInterface(input);
-        return getOrientation(ei);
+        return getOrientationMatrix(ei);
       }
       File file = getFileFromUri(context, uri);
       if (file.exists()) {
         ExifInterface ei = new ExifInterface(file.getAbsolutePath());
-        return getOrientation(ei);
+        return getOrientationMatrix(ei);
       }
     } catch (Exception ignored) { }
 
-    return 0;
+    return new Matrix();
   }
 
   /**
    * Convert metadata to degrees
    */
-  public static int getOrientation(ExifInterface exif) {
-    int orientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL);
+  public static Matrix getOrientationMatrix(ExifInterface exif) {
+    Matrix matrix = new Matrix();
+    int orientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_UNDEFINED);
     switch (orientation) {
+      case ExifInterface.ORIENTATION_FLIP_HORIZONTAL:
+        matrix.setScale(-1, 1);
+        break;
+      case ExifInterface.ORIENTATION_TRANSPOSE:
+        matrix.setRotate(90);
+        matrix.postScale(-1, 1);
+        break;
       case ExifInterface.ORIENTATION_ROTATE_90:
-        return 90;
+        matrix.setRotate(90);
+        break;
+      case ExifInterface.ORIENTATION_FLIP_VERTICAL:
+        matrix.setRotate(180);
+        matrix.postScale(-1, 1);
+        break;
       case ExifInterface.ORIENTATION_ROTATE_180:
-        return 180;
+        matrix.setRotate(180);
+        break;
+      case ExifInterface.ORIENTATION_TRANSVERSE:
+        matrix.setRotate(270);
+        matrix.postScale(-1, 1);
+        break;
       case ExifInterface.ORIENTATION_ROTATE_270:
-        return 270;
-      default:
-        return 0;
-    }
+        matrix.setRotate(270);
+        break;
+      }
+    return matrix;
   }
 
   /**
@@ -549,15 +566,14 @@ public static Bitmap createResizedImage(Context context, Uri imageUri, int newWi
     // get wrong dimensions if we want the new dimensions to be after rotation.
     // NOTE: This will "fix" the image using it's exif info if it is rotated as well.
     Bitmap rotatedImage = sourceImage;
-    int orientation = getOrientation(context, imageUri);
-    rotation = orientation + rotation;
-    rotatedImage = ImageResizer.rotateImage(sourceImage, rotation);
+    Matrix matrix = getOrientationMatrix(context, imageUri);
+    rotatedImage = ImageResizer.rotateImage(sourceImage, matrix, rotation);
 
     if(rotatedImage == null){
       throw new IOException("Unable to rotate image. Most likely due to not enough memory.");
     }
 
-    if (rotatedImage != rotatedImage) {
+    if (rotatedImage != sourceImage) {
       sourceImage.recycle();
     }