feat: 集成Tesseract源码到项目中

Description:   由于仓库中的Tesseract不是最新版本导致产生了一个bug，因此将Tesseract源码集成到项目中

Log: no
Change-Id: I088de95d6c6ab670406daa8d47ed2ed46929c2c0

3rdparty/tesseract_ocr/tesseract/src/ccmain/pagewalk.cpp

@@ -0,0 +1,42 @@
+/**********************************************************************
+ * File:        pagewalk.cpp  (Formerly walkers.c)
+ * Description: Block list processors
+ * Author:      Phil Cheatle
+ * Created:     Thu Oct 10 16:25:24 BST 1991
+ *
+ * (C) Copyright 1991, Hewlett-Packard Ltd.
+ ** Licensed under the Apache License, Version 2.0 (the "License");
+ ** you may not use this file except in compliance with the License.
+ ** You may obtain a copy of the License at
+ ** http://www.apache.org/licenses/LICENSE-2.0
+ ** Unless required by applicable law or agreed to in writing, software
+ ** distributed under the License is distributed on an "AS IS" BASIS,
+ ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ ** See the License for the specific language governing permissions and
+ ** limitations under the License.
+ *
+ **********************************************************************/
+
+#include "pageres.h"
+#include "tesseractclass.h"
+
+namespace tesseract {
+/**
+ * @name process_selected_words()
+ *
+ * Walk the current block list applying the specified word processor function
+ * to each word that overlaps the selection_box.
+ */
+void Tesseract::process_selected_words(
+    PAGE_RES *page_res, // blocks to check
+    TBOX &selection_box, bool (tesseract::Tesseract::*word_processor)(PAGE_RES_IT *pr_it)) {
+  for (PAGE_RES_IT page_res_it(page_res); page_res_it.word() != nullptr; page_res_it.forward()) {
+    WERD *word = page_res_it.word()->word;
+    if (word->bounding_box().overlap(selection_box)) {
+      if (!(this->*word_processor)(&page_res_it)) {
+        return;
+      }
+    }
+  }
+}
+} // namespace tesseract