Mercurial > hgrepos > Python2 > PyMuPDF
annotate mupdf-source/thirdparty/tesseract/src/ccstruct/quspline.h @ 46:7ee69f120f19 default tip
>>>>> tag v1.26.5+1 for changeset b74429b0f5c4
| author | Franz Glasner <fzglas.hg@dom66.de> |
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| date | Sat, 11 Oct 2025 17:17:30 +0200 |
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| rev | line source |
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1 /********************************************************************** |
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2 * File: quspline.h (Formerly qspline.h) |
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3 * Description: Code for the QSPLINE class. |
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4 * Author: Ray Smith |
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5 * Created: Tue Oct 08 17:16:12 BST 1991 |
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6 * |
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7 * (C) Copyright 1991, Hewlett-Packard Ltd. |
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8 ** Licensed under the Apache License, Version 2.0 (the "License"); |
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9 ** you may not use this file except in compliance with the License. |
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10 ** You may obtain a copy of the License at |
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11 ** http://www.apache.org/licenses/LICENSE-2.0 |
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12 ** Unless required by applicable law or agreed to in writing, software |
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13 ** distributed under the License is distributed on an "AS IS" BASIS, |
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14 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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15 ** See the License for the specific language governing permissions and |
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16 ** limitations under the License. |
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17 * |
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18 **********************************************************************/ |
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19 |
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20 #ifndef QUSPLINE_H |
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21 #define QUSPLINE_H |
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22 |
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23 #include "scrollview.h" // for ScrollView, ScrollView::Color |
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24 |
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25 #include <cstdint> // for int32_t |
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26 |
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27 struct Pix; |
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28 |
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29 namespace tesseract { |
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30 |
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31 class ICOORD; |
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32 class QUAD_COEFFS; |
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33 class ROW; |
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34 class TBOX; |
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35 |
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36 class TESS_API QSPLINE { |
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37 friend void make_first_baseline(TBOX *, int, int *, int *, QSPLINE *, QSPLINE *, float); |
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38 friend void make_holed_baseline(TBOX *, int, QSPLINE *, QSPLINE *, float); |
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39 friend void tweak_row_baseline(ROW *, double, double); |
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40 |
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41 public: |
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42 QSPLINE() { // empty constructor |
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43 segments = 0; |
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44 xcoords = nullptr; // everything empty |
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45 quadratics = nullptr; |
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46 } |
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47 QSPLINE( // copy constructor |
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48 const QSPLINE &src); |
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49 QSPLINE( // constructor |
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50 int32_t count, // number of segments |
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51 int32_t *xstarts, // segment starts |
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52 double *coeffs); // coefficients |
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53 ~QSPLINE(); // destructor |
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54 QSPLINE( // least squares fit |
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55 int xstarts[], // spline boundaries |
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56 int segcount, // no of segments |
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57 int xcoords[], // points to fit |
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58 int ycoords[], int blobcount, // no of coords |
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59 int degree); // function |
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60 |
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61 double step( // step change |
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62 double x1, // between coords |
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63 double x2); |
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64 double y( // evaluate |
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65 double x) const; // at x |
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66 |
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67 void move( // reposition spline |
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68 ICOORD vec); // by vector |
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69 bool overlap( // test overlap |
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70 QSPLINE *spline2, // 2 cannot be smaller |
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71 double fraction); // by more than this |
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72 void extrapolate( // linear extrapolation |
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73 double gradient, // gradient to use |
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74 int left, // new left edge |
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75 int right); // new right edge |
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76 |
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77 #ifndef GRAPHICS_DISABLED |
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78 void plot( // draw it |
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79 ScrollView *window, // in window |
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80 ScrollView::Color colour) const; // in colour |
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81 #endif |
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82 |
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83 // Paint the baseline over pix. If pix has depth of 32, then the line will |
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84 // be painted in red. Otherwise it will be painted in black. |
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85 void plot(Image pix) const; |
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86 |
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87 QSPLINE &operator=(const QSPLINE &source); // from this |
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88 |
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89 private: |
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90 int32_t spline_index( // binary search |
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91 double x) const; // for x |
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92 int32_t segments; // no of segments |
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93 int32_t *xcoords; // no of coords |
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94 QUAD_COEFFS *quadratics; // spline pieces |
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95 }; |
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96 |
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97 } // namespace tesseract |
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98 |
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99 #endif |
