文字根据自生偏移量定位，确保居中展示

src/test/java/com/ycwl/basic/image/watermark/operator/WatermarkOperatorTest.java

@@ -16,7 +16,7 @@ public class WatermarkOperatorTest {
     @Test
     public void testProcess() throws Exception {
         WatermarkInfo info = new WatermarkInfo();
-        info.setOriginalFile(new File("e2d32de7-6e85-4e07-b42f-477347073539.jpg"));
+        info.setOriginalFile(new File("38e1285c-84d0-464a-810d-053e9502e257.jpg"));
         info.setQrcodeFile(new File("cxzh_t.jpg"));
         info.setScenicLine("川西竹海一日游！");
         info.setDatetimeLine("2XXX年XX月XX日 留念");