Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/classify/mfoutline.h @ 46:7ee69f120f19 default tip

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
>>>>> tag v1.26.5+1 for changeset b74429b0f5c4
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 17:17:30 +0200
parents b50eed0cc0ef
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /******************************************************************************
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2 ** Filename: mfoutline.h
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3 ** Purpose: Interface spec for fx outline structures
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4 ** Author: Dan Johnson
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5 **
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6 ** (c) Copyright Hewlett-Packard Company, 1988.
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7 ** Licensed under the Apache License, Version 2.0 (the "License");
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8 ** you may not use this file except in compliance with the License.
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9 ** You may obtain a copy of the License at
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10 ** http://www.apache.org/licenses/LICENSE-2.0
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11 ** Unless required by applicable law or agreed to in writing, software
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12 ** distributed under the License is distributed on an "AS IS" BASIS,
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13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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14 ** See the License for the specific language governing permissions and
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15 ** limitations under the License.
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16 ******************************************************************************/
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18 #ifndef MFOUTLINE_H
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19 #define MFOUTLINE_H
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21 #include "blobs.h"
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22 #include "fpoint.h"
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23 #include "oldlist.h"
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24 #include "params.h"
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26 namespace tesseract {
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28 using MFOUTLINE = LIST;
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30 enum DIRECTION : uint8_t { north, south, east, west, northeast, northwest, southeast, southwest };
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32 struct MFEDGEPT {
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33 // Inline functions for manipulating micro-feature outline edge points.
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35 void ClearMark() {
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36 ExtremityMark = false;
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37 }
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39 void MarkPoint() {
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40 ExtremityMark = true;
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41 }
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43 FPOINT Point;
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44 float Slope;
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45 bool Hidden;
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46 bool ExtremityMark;
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47 DIRECTION Direction;
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48 DIRECTION PreviousDirection;
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49 };
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51 enum OUTLINETYPE { outer, hole };
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53 enum NORM_METHOD { baseline, character };
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55 /**----------------------------------------------------------------------------
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56 Macros
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57 ----------------------------------------------------------------------------**/
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58 #define AverageOf(A, B) (((A) + (B)) / 2)
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60 // Constant for computing the scale factor to use to normalize characters.
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61 const float MF_SCALE_FACTOR = 0.5f / kBlnXHeight;
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63 // Inline functions for manipulating micro-feature outlines.
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65 static inline bool DegenerateOutline(MFOUTLINE Outline) {
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66 return (Outline == NIL_LIST) || (Outline == Outline->list_rest());
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67 }
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69 static inline MFEDGEPT *PointAt(MFOUTLINE Outline) {
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70 return reinterpret_cast<MFEDGEPT *>(Outline->first_node());
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71 }
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73 static inline MFOUTLINE NextPointAfter(MFOUTLINE Outline) {
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74 return Outline->list_rest();
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75 }
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77 static inline void MakeOutlineCircular(MFOUTLINE Outline) {
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78 set_rest(last(Outline), Outline);
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79 }
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81 /**----------------------------------------------------------------------------
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82 Public Function Prototypes
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83 ----------------------------------------------------------------------------**/
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84 void ComputeBlobCenter(TBLOB *Blob, TPOINT *BlobCenter);
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86 LIST ConvertBlob(TBLOB *Blob);
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88 MFOUTLINE ConvertOutline(TESSLINE *Outline);
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90 LIST ConvertOutlines(TESSLINE *Outline, LIST ConvertedOutlines, OUTLINETYPE OutlineType);
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92 void FilterEdgeNoise(MFOUTLINE Outline, float NoiseSegmentLength);
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94 void FindDirectionChanges(MFOUTLINE Outline, float MinSlope, float MaxSlope);
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96 void FreeMFOutline(void *agr); // MFOUTLINE Outline);
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98 void FreeOutlines(LIST Outlines);
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100 void MarkDirectionChanges(MFOUTLINE Outline);
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101
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102 MFOUTLINE NextExtremity(MFOUTLINE EdgePoint);
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103
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104 void NormalizeOutline(MFOUTLINE Outline, float XOrigin);
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105
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106 /*----------------------------------------------------------------------------
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107 Private Function Prototypes
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108 -----------------------------------------------------------------------------*/
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109 void ChangeDirection(MFOUTLINE Start, MFOUTLINE End, DIRECTION Direction);
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110
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111 // Normalizes the Outline in-place using cn_denorm's local transformation,
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112 // then converts from the integer feature range [0,255] to the clusterer
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113 // feature range of [-0.5, 0.5].
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114 void CharNormalizeOutline(MFOUTLINE Outline, const DENORM &cn_denorm);
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115
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116 void ComputeDirection(MFEDGEPT *Start, MFEDGEPT *Finish, float MinSlope, float MaxSlope);
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117
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118 MFOUTLINE NextDirectionChange(MFOUTLINE EdgePoint);
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119
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120 } // namespace tesseract
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121
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122 #endif