OpenCV copy to Mat without transparent pixels

I have two images with the transparent background. I need to place both of these images with specific coordinates on the new OpenCV Mat with white background ( out Mat in the example below).

This is my current OpenCV code:

Mat out = new Mat(mat.size(), CvType.CV_8UC4);

out.setTo(new Scalar(255));

Mat rotatedMat = Imgcodecs.imread(partOfRotatedImageFile.getAbsolutePath(), Imgcodecs.CV_LOAD_IMAGE_UNCHANGED);
Rect roi = new Rect((int) (rect.center.x - rotatedMat.width() / 2), (int) (rect.center.y - rotatedMat.height() / 2), rotatedMat.width(), rotatedMat.height());
Mat outPart = null;
try {
     outPart = out.submat(roi);
} catch (Exception e) {
     System.err.println(e.getMessage());
     continue;
}
rotatedMat.copyTo(outPart);

In case the images overlap each other - one of them replaces the another image(that was previously placed) with transparent pixels.

For example:

Sorry for the bad image quality, but as you may see the left image with Alpha channel (presented with green rectangle) overlaps the right two images by Alpha channel.

Is it possible to update this code to copy everything from source Mat objects to the resulting Mat object except transparent pixels?

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