优化解码扫描区域的逻辑，使解码更快#519
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当设置只解码扫描框区域时，在processData里，从原始图像数据中抽出扫描框区域图像数据，传递给QRCodeView的processData方法。这样做可以更快的解码出扫描框区域图像中的条码或者二维码。