public void initialize(boolean mirror, int displayOrientation) {
mPreviewWidth = ApplicationScreen.getPreviewSurfaceLayoutWidth();
mPreviewHeight = ApplicationScreen.getPreviewSurfaceLayoutHeight();
Matrix matrix = new Matrix();
Util.prepareMatrix(matrix, mirror, 90, mPreviewWidth, mPreviewHeight);
// In face detection, the matrix converts the driver coordinates to UI
// coordinates. In tap focus, the inverted matrix converts the UI
// coordinates to driver coordinates.
matrix.invert(mMatrix);
mInitialized = true;
}
