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diff --git a/tesseract/src/ccstruct/polyblk.h b/tesseract/src/ccstruct/polyblk.h
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+/**********************************************************************
+ * File:        polyblk.h  (Formerly poly_block.h)
+ * Description: Polygonal blocks
+ *
+ * (C) Copyright 1993, 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.
+ *
+ **********************************************************************/
+
+#ifndef POLYBLK_H
+#define POLYBLK_H
+
+#include "elst.h"
+#include "points.h"
+#include "rect.h"
+#include "scrollview.h"
+
+#include <tesseract/publictypes.h>
+
+namespace tesseract {
+
+class TESS_API POLY_BLOCK {
+ public:
+  POLY_BLOCK() = default;
+  // Initialize from box coordinates.
+  POLY_BLOCK(const TBOX& tbox, PolyBlockType type);
+  POLY_BLOCK(ICOORDELT_LIST *points, PolyBlockType type);
+  ~POLY_BLOCK () = default;
+
+  TBOX *bounding_box() {  // access function
+    return &box;
+  }
+
+  ICOORDELT_LIST *points() {  // access function
+    return &vertices;
+  }
+
+  void compute_bb();
+
+  PolyBlockType isA() const {
+    return type;
+  }
+
+  bool IsText() const {
+    return PTIsTextType(type);
+  }
+
+  // Rotate about the origin by the given rotation. (Analogous to
+  // multiplying by a complex number.
+  void rotate(FCOORD rotation);
+  // Reflect the coords of the polygon in the y-axis. (Flip the sign of x.)
+  void reflect_in_y_axis();
+  // Move by adding shift to all coordinates.
+  void move(ICOORD shift);
+
+  void plot(ScrollView* window, int32_t num);
+
+  #ifndef GRAPHICS_DISABLED
+  void fill(ScrollView* window, ScrollView::Color colour);
+  #endif // !GRAPHICS_DISABLED
+
+  // Returns true if other is inside this.
+  bool contains(POLY_BLOCK *other);
+
+  // Returns true if the polygons of other and this overlap.
+  bool overlap(POLY_BLOCK *other);
+
+  // Returns the winding number of this around the test_pt.
+  // Positive for anticlockwise, negative for clockwise, and zero for
+  // test_pt outside this.
+  int16_t winding_number(const ICOORD &test_pt);
+
+  #ifndef GRAPHICS_DISABLED
+  // Static utility functions to handle the PolyBlockType.
+  // Returns a color to draw the given type.
+  static ScrollView::Color ColorForPolyBlockType(PolyBlockType type);
+  #endif // !GRAPHICS_DISABLED
+
+ private:
+  ICOORDELT_LIST vertices;     // vertices
+  TBOX box;                     // bounding box
+  PolyBlockType type;              // Type of this region.
+};
+
+// Class to iterate the scanlines of a polygon.
+class PB_LINE_IT {
+ public:
+  PB_LINE_IT(POLY_BLOCK *blkptr) {
+    block = blkptr;
+  }
+
+  void set_to_block(POLY_BLOCK * blkptr) {
+    block = blkptr;
+  }
+
+  // Returns a list of runs of pixels for the given y coord.
+  // Each element of the returned list is the start (x) and extent(y) of
+  // a run inside the region.
+  // Delete the returned list after use.
+  ICOORDELT_LIST *get_line(int16_t y);
+
+ private:
+  POLY_BLOCK * block;
+};
+
+} // namespace tesseract
+
+#endif