use canvas.clipOutPath if Android O or greater

Author: juliooa

cropper/src/main/java/com/theartofdev/edmodo/cropper/CropOverlayView.java

@@ -618,7 +618,11 @@ private void drawBackground(Canvas canvas) {
         mPath.close();
 
         canvas.save();
-        canvas.clipPath(mPath, Region.Op.INTERSECT);
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+          canvas.clipOutPath(mPath);
+        } else {
+          canvas.clipPath(mPath, Region.Op.INTERSECT);
+        }
         canvas.clipRect(rect, Region.Op.XOR);
         canvas.drawRect(left, top, right, bottom, mBackgroundPaint);
         canvas.restore();
@@ -632,7 +636,11 @@ private void drawBackground(Canvas canvas) {
       }
       mPath.addOval(mDrawRect, Path.Direction.CW);
       canvas.save();
-      canvas.clipPath(mPath, Region.Op.XOR);
+      if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+        canvas.clipOutPath(mPath);
+      } else {
+        canvas.clipPath(mPath, Region.Op.INTERSECT);
+      }
       canvas.drawRect(left, top, right, bottom, mBackgroundPaint);
       canvas.restore();
     }