Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/textord/bbgrid.cpp @ 21:2f43e400f144

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Provide an "all" target to build both the sdist and the wheel
author Franz Glasner <fzglas.hg@dom66.de>
date Fri, 19 Sep 2025 10:28:53 +0200
parents b50eed0cc0ef
children
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2
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1 ///////////////////////////////////////////////////////////////////////
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2 // File: bbgrid.cpp
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3 // Description: Class to hold BLOBNBOXs in a grid for fast access
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4 // to neighbours.
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5 // Author: Ray Smith
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6 //
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7 // (C) Copyright 2007, Google Inc.
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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 #include "bbgrid.h"
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21 #include "helpers.h"
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22 #include "ocrblock.h"
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24 namespace tesseract {
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26 ///////////////////////////////////////////////////////////////////////
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27 // BBGrid IMPLEMENTATION.
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28 ///////////////////////////////////////////////////////////////////////
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29 GridBase::GridBase(int gridsize, const ICOORD &bleft, const ICOORD &tright) {
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30 Init(gridsize, bleft, tright);
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31 }
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32
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33 // Destructor.
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34 // It is defined here, so the compiler can create a single vtable
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35 // instead of weak vtables in every compilation unit.
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36 GridBase::~GridBase() = default;
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38 // (Re)Initialize the grid. The gridsize is the size in pixels of each cell,
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39 // and bleft, tright are the bounding box of everything to go in it.
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40 void GridBase::Init(int gridsize, const ICOORD &bleft, const ICOORD &tright) {
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41 gridsize_ = gridsize;
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42 bleft_ = bleft;
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43 tright_ = tright;
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44 if (gridsize_ == 0) {
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45 gridsize_ = 1;
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46 }
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47 gridwidth_ = (tright.x() - bleft.x() + gridsize_ - 1) / gridsize_;
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48 gridheight_ = (tright.y() - bleft.y() + gridsize_ - 1) / gridsize_;
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49 gridbuckets_ = gridwidth_ * gridheight_;
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50 }
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52 // Compute the given grid coordinates from image coords.
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53 void GridBase::GridCoords(int x, int y, int *grid_x, int *grid_y) const {
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54 *grid_x = (x - bleft_.x()) / gridsize_;
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55 *grid_y = (y - bleft_.y()) / gridsize_;
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56 ClipGridCoords(grid_x, grid_y);
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57 }
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58
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59 // Clip the given grid coordinates to fit within the grid.
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60 void GridBase::ClipGridCoords(int *x, int *y) const {
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61 *x = ClipToRange(*x, 0, gridwidth_ - 1);
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62 *y = ClipToRange(*y, 0, gridheight_ - 1);
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63 }
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64
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65 IntGrid::IntGrid() {
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66 grid_ = nullptr;
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67 }
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69 IntGrid::IntGrid(int gridsize, const ICOORD &bleft, const ICOORD &tright) : grid_(nullptr) {
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70 Init(gridsize, bleft, tright);
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71 }
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73 IntGrid::~IntGrid() {
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74 delete[] grid_;
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75 }
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77 // (Re)Initialize the grid. The gridsize is the size in pixels of each cell,
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78 // and bleft, tright are the bounding box of everything to go in it.
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79 void IntGrid::Init(int gridsize, const ICOORD &bleft, const ICOORD &tright) {
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80 GridBase::Init(gridsize, bleft, tright);
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81 delete[] grid_;
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82 grid_ = new int[gridbuckets_];
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83 Clear();
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84 }
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85
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86 // Clear all the ints in the grid to zero.
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87 void IntGrid::Clear() {
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88 for (int i = 0; i < gridbuckets_; ++i) {
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89 grid_[i] = 0;
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90 }
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91 }
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92
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93 // Rotate the grid by rotation, keeping cell contents.
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94 // rotation must be a multiple of 90 degrees.
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95 // NOTE: due to partial cells, cell coverage in the rotated grid will be
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96 // inexact. This is why there is no Rotate for the generic BBGrid.
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97 // TODO(rays) investigate fixing this inaccuracy by moving the origin after
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98 // rotation.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
99 void IntGrid::Rotate(const FCOORD &rotation) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
100 ASSERT_HOST(rotation.x() == 0.0f || rotation.y() == 0.0f);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
101 ICOORD old_bleft(bleft());
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
102 // ICOORD old_tright(tright());
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
103 int old_width = gridwidth();
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
104 int old_height = gridheight();
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
105 TBOX box(bleft(), tright());
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
106 box.rotate(rotation);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
107 int *old_grid = grid_;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
108 grid_ = nullptr;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
109 Init(gridsize(), box.botleft(), box.topright());
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
110 // Iterate over the old grid, copying data to the rotated position in the new.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
111 int oldi = 0;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
112 FCOORD x_step(rotation);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
113 x_step *= gridsize();
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
114 for (int oldy = 0; oldy < old_height; ++oldy) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
115 FCOORD line_pos(old_bleft.x(), old_bleft.y() + gridsize() * oldy);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
116 line_pos.rotate(rotation);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
117 for (int oldx = 0; oldx < old_width; ++oldx, line_pos += x_step, ++oldi) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
118 int grid_x, grid_y;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
119 GridCoords(static_cast<int>(line_pos.x() + 0.5), static_cast<int>(line_pos.y() + 0.5),
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
120 &grid_x, &grid_y);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
121 grid_[grid_y * gridwidth() + grid_x] = old_grid[oldi];
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
122 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
123 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
124 delete[] old_grid;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
125 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
126
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
127 // Returns a new IntGrid containing values equal to the sum of all the
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
128 // neighbouring cells. The returned grid must be deleted after use.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
129 // For ease of implementation, edge cells are double counted, to make them
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
130 // have the same range as the non-edge cells.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
131 IntGrid *IntGrid::NeighbourhoodSum() const {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
132 auto *sumgrid = new IntGrid(gridsize(), bleft(), tright());
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
133 for (int y = 0; y < gridheight(); ++y) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
134 for (int x = 0; x < gridwidth(); ++x) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
135 int cell_count = 0;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
136 for (int yoffset = -1; yoffset <= 1; ++yoffset) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
137 for (int xoffset = -1; xoffset <= 1; ++xoffset) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
138 int grid_x = x + xoffset;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
139 int grid_y = y + yoffset;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
140 ClipGridCoords(&grid_x, &grid_y);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
141 cell_count += GridCellValue(grid_x, grid_y);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
142 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
143 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
144 if (GridCellValue(x, y) > 1) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
145 sumgrid->SetGridCell(x, y, cell_count);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
146 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
147 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
148 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
149 return sumgrid;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
150 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
151
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
152 // Returns true if more than half the area of the rect is covered by grid
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
153 // cells that are over the threshold.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
154 bool IntGrid::RectMostlyOverThreshold(const TBOX &rect, int threshold) const {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
155 int min_x, min_y, max_x, max_y;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
156 GridCoords(rect.left(), rect.bottom(), &min_x, &min_y);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
157 GridCoords(rect.right(), rect.top(), &max_x, &max_y);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
158 int total_area = 0;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
159 for (int y = min_y; y <= max_y; ++y) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
160 for (int x = min_x; x <= max_x; ++x) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
161 int value = GridCellValue(x, y);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
162 if (value > threshold) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
163 TBOX cell_box(x * gridsize_, y * gridsize_, (x + 1) * gridsize_, (y + 1) * gridsize_);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
164 cell_box &= rect; // This is in-place box intersection.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
165 total_area += cell_box.area();
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
166 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
167 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
168 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
169 return total_area * 2 > rect.area();
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
170 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
171
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
172 // Returns true if any cell value in the given rectangle is zero.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
173 bool IntGrid::AnyZeroInRect(const TBOX &rect) const {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
174 int min_x, min_y, max_x, max_y;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
175 GridCoords(rect.left(), rect.bottom(), &min_x, &min_y);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
176 GridCoords(rect.right(), rect.top(), &max_x, &max_y);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
177 for (int y = min_y; y <= max_y; ++y) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
178 for (int x = min_x; x <= max_x; ++x) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
179 if (GridCellValue(x, y) == 0) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
180 return true;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
181 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
182 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
183 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
184 return false;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
185 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
186
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
187 // Returns a full-resolution binary pix in which each cell over the given
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
188 // threshold is filled as a black square. pixDestroy after use.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
189 // Edge cells, which have a zero 4-neighbour, are not marked.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
190 Image IntGrid::ThresholdToPix(int threshold) const {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
191 Image pix = pixCreate(tright().x() - bleft().x(), tright().y() - bleft().y(), 1);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
192 int cellsize = gridsize();
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
193 for (int y = 0; y < gridheight(); ++y) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
194 for (int x = 0; x < gridwidth(); ++x) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
195 if (GridCellValue(x, y) > threshold && GridCellValue(x - 1, y) > 0 &&
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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196 GridCellValue(x + 1, y) > 0 && GridCellValue(x, y - 1) > 0 &&
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
197 GridCellValue(x, y + 1) > 0) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
198 pixRasterop(pix, x * cellsize, tright().y() - ((y + 1) * cellsize), cellsize, cellsize,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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199 PIX_SET, nullptr, 0, 0);
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200 }
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201 }
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parents:
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202 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
203 return pix;
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204 }
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parents:
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205
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parents:
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206 // Make a Pix of the correct scaled size for the TraceOutline functions.
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Franz Glasner <fzglas.hg@dom66.de>
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207 static Image GridReducedPix(const TBOX &box, int gridsize, ICOORD bleft, int *left, int *bottom) {
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208 // Compute grid bounds of the outline and pad all round by 1.
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parents:
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209 int grid_left = (box.left() - bleft.x()) / gridsize - 1;
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Franz Glasner <fzglas.hg@dom66.de>
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210 int grid_bottom = (box.bottom() - bleft.y()) / gridsize - 1;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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211 int grid_right = (box.right() - bleft.x()) / gridsize + 1;
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parents:
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212 int grid_top = (box.top() - bleft.y()) / gridsize + 1;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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213 *left = grid_left;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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214 *bottom = grid_bottom;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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215 return pixCreate(grid_right - grid_left + 1, grid_top - grid_bottom + 1, 1);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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216 }
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parents:
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217
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218 // Helper function to return a scaled Pix with one pixel per grid cell,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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219 // set (black) where the given outline enters the corresponding grid cell,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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220 // and clear where the outline does not touch the grid cell.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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221 // Also returns the grid coords of the bottom-left of the Pix, in *left
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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222 // and *bottom, which corresponds to (0, 0) on the Pix.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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223 // Note that the Pix is used upside-down, with (0, 0) being the bottom-left.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
224 Image TraceOutlineOnReducedPix(C_OUTLINE *outline, int gridsize, ICOORD bleft, int *left,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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225 int *bottom) {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
226 const TBOX &box = outline->bounding_box();
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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227 Image pix = GridReducedPix(box, gridsize, bleft, left, bottom);
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parents:
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228 int wpl = pixGetWpl(pix);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
229 l_uint32 *data = pixGetData(pix);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
230 int length = outline->pathlength();
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
231 ICOORD pos = outline->start_pos();
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
232 for (int i = 0; i < length; ++i) {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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233 int grid_x = (pos.x() - bleft.x()) / gridsize - *left;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
234 int grid_y = (pos.y() - bleft.y()) / gridsize - *bottom;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
235 SET_DATA_BIT(data + grid_y * wpl, grid_x);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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236 pos += outline->step(i);
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parents:
diff changeset
237 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
238 return pix;
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parents:
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239 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
240 #if 0 // Example code shows how to use TraceOutlineOnReducedPix.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
241 C_OUTLINE_IT ol_it(blob->cblob()->out_list());
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
242 int grid_left, grid_bottom;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
243 Pix* pix = TraceOutlineOnReducedPix(ol_it.data(), gridsize_, bleft_,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
244 &grid_left, &grid_bottom);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
245 grid->InsertPixPtBBox(grid_left, grid_bottom, pix, blob);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
246 pix.destroy();
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
247 #endif
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parents:
diff changeset
248
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parents:
diff changeset
249 // As TraceOutlineOnReducedPix above, but on a BLOCK instead of a C_OUTLINE.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
250 Image TraceBlockOnReducedPix(BLOCK *block, int gridsize, ICOORD bleft, int *left, int *bottom) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
251 const TBOX &box = block->pdblk.bounding_box();
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
252 Image pix = GridReducedPix(box, gridsize, bleft, left, bottom);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
253 int wpl = pixGetWpl(pix);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
254 l_uint32 *data = pixGetData(pix);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
255 ICOORDELT_IT it(block->pdblk.poly_block()->points());
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
256 for (it.mark_cycle_pt(); !it.cycled_list();) {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
257 ICOORD pos = *it.data();
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
258 it.forward();
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
259 ICOORD next_pos = *it.data();
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
260 ICOORD line_vector = next_pos - pos;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
261 int major, minor;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
262 ICOORD major_step, minor_step;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
263 line_vector.setup_render(&major_step, &minor_step, &major, &minor);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
264 int accumulator = major / 2;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
265 while (pos != next_pos) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
266 int grid_x = (pos.x() - bleft.x()) / gridsize - *left;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
267 int grid_y = (pos.y() - bleft.y()) / gridsize - *bottom;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
268 SET_DATA_BIT(data + grid_y * wpl, grid_x);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
269 pos += major_step;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
270 accumulator += minor;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
271 if (accumulator >= major) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
272 accumulator -= major;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
273 pos += minor_step;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
274 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
275 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
276 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
277 return pix;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
278 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
279
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
280 } // namespace tesseract.