--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/tesseract/src/classify/mfoutline.h	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,122 @@
+/******************************************************************************
+ ** Filename:    mfoutline.h
+ ** Purpose:     Interface spec for fx outline structures
+ ** 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 MFOUTLINE_H
+#define MFOUTLINE_H
+
+#include "blobs.h"
+#include "fpoint.h"
+#include "oldlist.h"
+#include "params.h"
+
+namespace tesseract {
+
+using MFOUTLINE = LIST;
+
+enum DIRECTION : uint8_t { north, south, east, west, northeast, northwest, southeast, southwest };
+
+struct MFEDGEPT {
+  // Inline functions for manipulating micro-feature outline edge points.
+
+  void ClearMark() {
+    ExtremityMark = false;
+  }
+
+  void MarkPoint() {
+    ExtremityMark = true;
+  }
+
+  FPOINT Point;
+  float Slope;
+  bool Hidden;
+  bool ExtremityMark;
+  DIRECTION Direction;
+  DIRECTION PreviousDirection;
+};
+
+enum OUTLINETYPE { outer, hole };
+
+enum NORM_METHOD { baseline, character };
+
+/**----------------------------------------------------------------------------
+          Macros
+----------------------------------------------------------------------------**/
+#define AverageOf(A, B) (((A) + (B)) / 2)
+
+// Constant for computing the scale factor to use to normalize characters.
+const float MF_SCALE_FACTOR = 0.5f / kBlnXHeight;
+
+// Inline functions for manipulating micro-feature outlines.
+
+static inline bool DegenerateOutline(MFOUTLINE Outline) {
+  return (Outline == NIL_LIST) || (Outline == Outline->list_rest());
+}
+
+static inline MFEDGEPT *PointAt(MFOUTLINE Outline) {
+  return reinterpret_cast<MFEDGEPT *>(Outline->first_node());
+}
+
+static inline MFOUTLINE NextPointAfter(MFOUTLINE Outline) {
+  return Outline->list_rest();
+}
+
+static inline void MakeOutlineCircular(MFOUTLINE Outline) {
+  set_rest(last(Outline), Outline);
+}
+
+/**----------------------------------------------------------------------------
+          Public Function Prototypes
+----------------------------------------------------------------------------**/
+void ComputeBlobCenter(TBLOB *Blob, TPOINT *BlobCenter);
+
+LIST ConvertBlob(TBLOB *Blob);
+
+MFOUTLINE ConvertOutline(TESSLINE *Outline);
+
+LIST ConvertOutlines(TESSLINE *Outline, LIST ConvertedOutlines, OUTLINETYPE OutlineType);
+
+void FilterEdgeNoise(MFOUTLINE Outline, float NoiseSegmentLength);
+
+void FindDirectionChanges(MFOUTLINE Outline, float MinSlope, float MaxSlope);
+
+void FreeMFOutline(void *agr); // MFOUTLINE Outline);
+
+void FreeOutlines(LIST Outlines);
+
+void MarkDirectionChanges(MFOUTLINE Outline);
+
+MFOUTLINE NextExtremity(MFOUTLINE EdgePoint);
+
+void NormalizeOutline(MFOUTLINE Outline, float XOrigin);
+
+/*----------------------------------------------------------------------------
+          Private Function Prototypes
+-----------------------------------------------------------------------------*/
+void ChangeDirection(MFOUTLINE Start, MFOUTLINE End, DIRECTION Direction);
+
+// Normalizes the Outline in-place using cn_denorm's local transformation,
+// then converts from the integer feature range [0,255] to the clusterer
+// feature range of [-0.5, 0.5].
+void CharNormalizeOutline(MFOUTLINE Outline, const DENORM &cn_denorm);
+
+void ComputeDirection(MFEDGEPT *Start, MFEDGEPT *Finish, float MinSlope, float MaxSlope);
+
+MFOUTLINE NextDirectionChange(MFOUTLINE EdgePoint);
+
+} // namespace tesseract
+
+#endif