--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/tesseract/src/training/mergenf.h	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,77 @@
+/******************************************************************************
+ ** Filename:   MergeNF.c
+ ** Purpose:    Program for merging similar nano-feature protos
+ ** Author:     Dan Johnson
+ **
+ ** (c) Copyright Hewlett-Packard Company, 1988.
+ ** 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_TRAINING_MERGENF_H_
+#define TESSERACT_TRAINING_MERGENF_H_
+
+/**----------------------------------------------------------------------------
+     Include Files and Type Defines
+----------------------------------------------------------------------------**/
+#include "cluster.h"
+#include "ocrfeatures.h"
+#include "picofeat.h"
+#include "protos.h"
+
+#define WORST_MATCH_ALLOWED (0.9)
+#define WORST_EVIDENCE (1.0)
+#define MAX_LENGTH_MISMATCH (2.0 * GetPicoFeatureLength())
+
+#define PROTO_SUFFIX ".mf.p"
+#define CONFIG_SUFFIX ".cl"
+#define NO_PROTO (-1)
+#define XPOSITION 0
+#define YPOSITION 1
+#define MFLENGTH 2
+#define ORIENTATION 3
+
+struct FRECT {
+  float MinX, MaxX, MinY, MaxY;
+};
+
+/**----------------------------------------------------------------------------
+      Public Macros
+----------------------------------------------------------------------------**/
+#define CenterX(M) ((M)[XPOSITION])
+#define CenterY(M) ((M)[YPOSITION])
+#define LengthOf(M) ((M)[MFLENGTH])
+#define OrientationOf(M) ((M)[ORIENTATION])
+
+/**----------------------------------------------------------------------------
+     Public Function Prototypes
+----------------------------------------------------------------------------**/
+float CompareProtos(tesseract::PROTO_STRUCT *p1, tesseract::PROTO_STRUCT *p2);
+
+void ComputeMergedProto(tesseract::PROTO_STRUCT *p1, tesseract::PROTO_STRUCT *p2, float w1, float w2,
+                        tesseract::PROTO_STRUCT *MergedProto);
+
+int FindClosestExistingProto(tesseract::CLASS_TYPE Class, int NumMerged[],
+                             tesseract::PROTOTYPE *Prototype);
+
+void MakeNewFromOld(tesseract::PROTO_STRUCT *New, tesseract::PROTOTYPE *Old);
+
+float SubfeatureEvidence(tesseract::FEATURE Feature, tesseract::PROTO_STRUCT *Proto);
+
+double EvidenceOf(double Similarity);
+
+bool DummyFastMatch(tesseract::FEATURE Feature, tesseract::PROTO_STRUCT *Proto);
+
+void ComputePaddedBoundingBox(tesseract::PROTO_STRUCT *Proto, float TangentPad, float OrthogonalPad,
+                              FRECT *BoundingBox);
+
+bool PointInside(FRECT *Rectangle, float X, float Y);
+
+#endif // TESSERACT_TRAINING_MERGENF_H_