rotate images based on EXIF data in preview

fiexes #91

1 files changed, 47 insertions, 0 deletions

diff --git a/src/main/java/de/pixart/messenger/persistance/FileBackend.java b/src/main/java/de/pixart/messenger/persistance/FileBackend.java
index bb8717551..d1e18f313 100644
--- a/src/main/java/de/pixart/messenger/persistance/FileBackend.java
+++ b/src/main/java/de/pixart/messenger/persistance/FileBackend.java
@@ -10,6 +10,7 @@ import android.graphics.BitmapFactory;
 import android.graphics.Canvas;
 import android.graphics.Matrix;
 import android.graphics.RectF;
+import android.media.ExifInterface;
 import android.media.MediaMetadataRetriever;
 import android.net.Uri;
 import android.os.Build;
@@ -899,4 +900,50 @@ public class FileBackend {
 			return true;
 		}
 	}
+
+	public static Bitmap rotateBitmap(File file, Bitmap bitmap, int orientation) {
+
+		if (orientation == 1) {
+            return bitmap;
+        }
+
+		Matrix matrix = new Matrix();
+		switch (orientation) {
+            case 2:
+                matrix.setScale(-1, 1);
+                break;
+            case 3:
+                matrix.setRotate(180);
+                break;
+            case 4:
+                matrix.setRotate(180);
+                matrix.postScale(-1, 1);
+                break;
+            case 5:
+                matrix.setRotate(90);
+                matrix.postScale(-1, 1);
+                break;
+            case 6:
+                matrix.setRotate(90);
+                break;
+            case 7:
+                matrix.setRotate(-90);
+                matrix.postScale(-1, 1);
+                break;
+            case 8:
+                matrix.setRotate(-90);
+                break;
+            default:
+                return bitmap;
+        }
+
+		try {
+            Bitmap oriented = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);
+            bitmap.recycle();
+            return oriented;
+        } catch (OutOfMemoryError e) {
+            e.printStackTrace();
+            return bitmap;
+        }
+	}
 }