Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/ccstruct/stepblob.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 * File: stepblob.h (Formerly cblob.h)
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3 * Description: Code for C_BLOB class.
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4 * Author: Ray Smith
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5 * Created: Tue Oct 08 10:41:13 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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20 #ifndef STEPBLOB_H
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21 #define STEPBLOB_H
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23 #include "coutln.h" // for C_OUTLINE_LIST, C_OUTLINE
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24 #include "elst.h" // for ELIST_ITERATOR, ELISTIZEH, ELIST_LINK
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25 #include "points.h" // for FCOORD, ICOORD (ptr only)
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26 #include "rect.h" // for TBOX
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27 #include "scrollview.h" // for ScrollView, ScrollView::Color
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29 #include <cstdint> // for int32_t, int16_t
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31 struct Pix;
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33 namespace tesseract {
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35 class C_BLOB;
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36 class DENORM;
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38 ELISTIZEH(C_BLOB)
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40 class TESS_API C_BLOB : public ELIST_LINK {
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41 public:
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42 C_BLOB() = default;
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43 explicit C_BLOB(C_OUTLINE_LIST *outline_list);
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44 // Simpler constructor to build a blob from a single outline that has
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45 // already been fully initialized.
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46 explicit C_BLOB(C_OUTLINE *outline);
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48 // Builds a set of one or more blobs from a list of outlines.
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49 // Input: one outline on outline_list contains all the others, but the
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50 // nesting and order are undefined.
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51 // If good_blob is true, the blob is added to good_blobs_it, unless
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52 // an illegal (generation-skipping) parent-child relationship is found.
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53 // If so, the parent blob goes to bad_blobs_it, and the immediate children
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54 // are promoted to the top level, recursively being sent to good_blobs_it.
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55 // If good_blob is false, all created blobs will go to the bad_blobs_it.
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56 // Output: outline_list is empty. One or more blobs are added to
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57 // good_blobs_it and/or bad_blobs_it.
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58 static void ConstructBlobsFromOutlines(bool good_blob, C_OUTLINE_LIST *outline_list,
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59 C_BLOB_IT *good_blobs_it, C_BLOB_IT *bad_blobs_it);
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61 // Sets the COUT_INVERSE flag appropriately on the outlines and their
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62 // children recursively, reversing the outlines if needed so that
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63 // everything has an anticlockwise top-level.
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64 void CheckInverseFlagAndDirection();
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66 // Build and return a fake blob containing a single fake outline with no
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67 // steps.
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68 static C_BLOB *FakeBlob(const TBOX &box);
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70 C_OUTLINE_LIST *out_list() { // get outline list
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71 return &outlines;
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72 }
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74 TBOX bounding_box() const; // compute bounding box
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75 int32_t area(); // compute area
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76 int32_t perimeter(); // Total perimeter of outlines and 1st level children.
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77 int32_t outer_area(); // compute area
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78 int32_t count_transitions( // count maxima
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79 int32_t threshold); // size threshold
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81 void move(const ICOORD vec); // reposition blob by vector
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82 void rotate(const FCOORD &rotation); // Rotate by given vector.
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83
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84 // Adds sub-pixel resolution EdgeOffsets for the outlines using greyscale
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85 // if the supplied pix is 8-bit or the binary edges if nullptr.
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86 void ComputeEdgeOffsets(int threshold, Image pix);
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87
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88 // Estimates and returns the baseline position based on the shape of the
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89 // outlines.
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90 int16_t EstimateBaselinePosition();
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91
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92 // Returns a Pix rendering of the blob. pixDestroy after use.
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93 Image render();
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94 // Returns a Pix rendering of the outline of the blob. (no fill).
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95 // pixDestroy after use.
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96 Image render_outline();
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97
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98 #ifndef GRAPHICS_DISABLED
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99 void plot( // draw one
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100 ScrollView *window, // window to draw in
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101 ScrollView::Color blob_colour, // for outer bits
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102 ScrollView::Color child_colour); // for holes
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103 // Draws the blob in the given colour, and child_colour, normalized
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104 // using the given denorm, making use of sub-pixel accurate information
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105 // if available.
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106 void plot_normed(const DENORM &denorm, ScrollView::Color blob_colour,
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107 ScrollView::Color child_colour, ScrollView *window);
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108 #endif // !GRAPHICS_DISABLED
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109
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110 C_BLOB &operator=(const C_BLOB &source) {
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111 if (!outlines.empty()) {
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112 outlines.clear();
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113 }
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114 outlines.deep_copy(&source.outlines, &C_OUTLINE::deep_copy);
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115 return *this;
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116 }
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117
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118 static C_BLOB *deep_copy(const C_BLOB *src) {
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119 auto *blob = new C_BLOB;
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120 *blob = *src;
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121 return blob;
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122 }
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123
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124 static int SortByXMiddle(const void *v1, const void *v2) {
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125 const C_BLOB *blob1 = *static_cast<const C_BLOB *const *>(v1);
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126 const C_BLOB *blob2 = *static_cast<const C_BLOB *const *>(v2);
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127 return blob1->bounding_box().x_middle() - blob2->bounding_box().x_middle();
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128 }
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129
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130 private:
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131 C_OUTLINE_LIST outlines; // master elements
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132 };
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133
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134 } // namespace tesseract
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135
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136 #endif