public Matrix createOrientationCalculationMatrix() {
        final Matrix m = new Matrix();
        m.postScale(flipHorizontal ? -1 : 1, 1);
        m.postRotate(rotateDegree);
        return m;
    }
Returns a Matrix to calculate a correctly oriented Bitmap from a "raw" loaded bitmap
Note: if an already oriented bitmap (as calculated by this matrix) is applied to a view, then the "applyTo" methods of this class
can't be used any more. Would result in "double application" or the orientation and thus in strange results :-)
main/src/main/java/cgeo/geocaching/utils/ViewOrientation.java