ScannerView.java 文件源码

public void setFraming(final Rect frame, final RectF framePreview, final int displayRotation,
        final int cameraRotation, final boolean cameraFlip) {
    this.frame = frame;
    matrix.setRectToRect(framePreview, new RectF(frame), ScaleToFit.FILL);
    matrix.postRotate(-displayRotation, frame.exactCenterX(), frame.exactCenterY());
    matrix.postScale(cameraFlip ? -1 : 1, 1, frame.exactCenterX(), frame.exactCenterY());
    matrix.postRotate(cameraRotation, frame.exactCenterX(), frame.exactCenterY());

    invalidate();
}