--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/tesseract/src/textord/equationdetectbase.h	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,61 @@
+///////////////////////////////////////////////////////////////////////
+// File:        equationdetectbase.h
+// Description: The base class equation detection class.
+// Author:      Zongyi (Joe) Liu (joeliu@google.com)
+// Created:     Fri Aug 31 11:13:01 PST 2011
+//
+// (C) Copyright 2011, Google Inc.
+// 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 TESSERACT_TEXTORD_EQUATIONDETECTBASE_H_
+#define TESSERACT_TEXTORD_EQUATIONDETECTBASE_H_
+
+#include "image.h"
+
+class BLOBNBOX_LIST;
+class TO_BLOCK;
+struct Pix;
+
+namespace tesseract {
+
+class ColPartitionGrid;
+class ColPartitionSet;
+class BLOBNBOX;
+
+class TESS_API EquationDetectBase {
+public:
+  EquationDetectBase() = default;
+  virtual ~EquationDetectBase();
+
+  // Iterate over the blobs inside to_block, and set the blobs that we want to
+  // process to BSTT_NONE. (By default, they should be BSTT_SKIP). The function
+  // returns 0 upon success.
+  virtual int LabelSpecialText(TO_BLOCK *to_block) = 0;
+
+  // Interface to find possible equation partition grid from part_grid. This
+  // should be called after IdentifySpecialText function.
+  virtual int FindEquationParts(ColPartitionGrid *part_grid, ColPartitionSet **best_columns) = 0;
+
+  // Debug function: Render a bounding box on pix based on the value of its
+  // special_text_type, specifically:
+  // BSTT_MATH: red box
+  // BSTT_DIGIT: cyan box
+  // BSTT_ITALIC: green box
+  // BSTT_UNCLEAR: blue box
+  // All others: yellow box
+  static void RenderSpecialText(Image pix, BLOBNBOX *blob);
+};
+
+} // namespace tesseract
+
+#endif // TESSERACT_TEXTORD_EQUATIONDETECTBASE_H_