Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/ccstruct/coutln.h @ 17:dd9cdb856310

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Remove PKG-INFO from the because it is regenerated automatically for the sdist
author Franz Glasner <fzglas.hg@dom66.de>
date Thu, 18 Sep 2025 17:40:40 +0200
parents b50eed0cc0ef
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /**********************************************************************
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2 * File: coutln.h
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3 * Description: Code for the C_OUTLINE class.
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4 * Author: Ray Smith
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5 *
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6 * (C) Copyright 1991, Hewlett-Packard Ltd.
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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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17 **********************************************************************/
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19 #ifndef COUTLN_H
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20 #define COUTLN_H
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22 #include "elst.h" // for ELIST_ITERATOR, ELISTIZEH, ELIST_LINK
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23 #include "mod128.h" // for DIR128, DIRBITS
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24 #include "points.h" // for ICOORD, FCOORD
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25 #include "rect.h" // for TBOX
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26 #include "scrollview.h" // for ScrollView, ScrollView::Color
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28 #include <tesseract/export.h> // for DLLSYM
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30 #include <cstdint> // for int16_t, int32_t
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31 #include <bitset> // for std::bitset<16>
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33 struct Pix;
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35 namespace tesseract {
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37 class CRACKEDGE;
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38 class DENORM;
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40 #define INTERSECTING INT16_MAX // no winding number
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42 // mask to get step
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43 #define STEP_MASK 3
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45 enum C_OUTLINE_FLAGS {
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46 COUT_INVERSE // White on black blob
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47 };
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49 // Simple struct to hold the 3 values needed to compute a more precise edge
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50 // position and direction. The offset_numerator is the difference between the
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51 // grey threshold and the mean pixel value. pixel_diff is the difference between
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52 // the pixels in the edge. Consider the following row of pixels: p1 p2 p3 p4 p5
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53 // Say the image was thresholded at threshold t, making p1, p2, p3 black
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54 // and p4, p5 white (p1, p2, p3 < t, and p4, p5 >= t), but suppose that
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55 // max(p[i+1] - p[i]) is p3 - p2. Then the extrapolated position of the edge,
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56 // based on the maximum gradient, is at the crack between p2 and p3 plus the
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57 // offset (t - (p2+p3)/2)/(p3 - p2). We store the pixel difference p3-p2
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58 // denominator in pixel_diff and the offset numerator, relative to the original
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59 // binary edge (t - (p2+p3)/2) - (p3 -p2) in offset_numerator.
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60 // The sign of offset_numerator and pixel_diff are manipulated to ensure
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61 // that the pixel_diff, which will be used as a weight, is always positive.
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62 // The direction stores the quantized feature direction for the given step
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63 // computed from the edge gradient. (Using binary_angle_plus_pi.)
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64 // If the pixel_diff is zero, it means that the direction of the gradient
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65 // is in conflict with the step direction, so this step is to be ignored.
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66 struct EdgeOffset {
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67 int8_t offset_numerator;
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68 uint8_t pixel_diff;
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69 uint8_t direction;
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70 };
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72 class C_OUTLINE; // forward declaration
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74 ELISTIZEH(C_OUTLINE)
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75 class C_OUTLINE : public ELIST_LINK {
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76 public:
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77 C_OUTLINE() {
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78 stepcount = 0;
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79 offsets = nullptr;
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80 }
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81 C_OUTLINE( // constructor
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82 CRACKEDGE *startpt, // from edge detector
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83 ICOORD bot_left, // bounding box //length of loop
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84 ICOORD top_right, int16_t length);
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85 C_OUTLINE(ICOORD startpt, // start of loop
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86 DIR128 *new_steps, // steps in loop
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87 int16_t length); // length of loop
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88 // outline to copy
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89 C_OUTLINE(C_OUTLINE *srcline, FCOORD rotation); // and rotate
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90
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91 // Build a fake outline, given just a bounding box and append to the list.
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92 static void FakeOutline(const TBOX &box, C_OUTLINE_LIST *outlines);
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94 ~C_OUTLINE() { // destructor
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95 delete[] offsets;
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96 }
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98 bool flag( // test flag
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
99 C_OUTLINE_FLAGS mask) const { // flag to test
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 return flags[mask];
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parents:
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101 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
102 void set_flag( // set flag value
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
103 C_OUTLINE_FLAGS mask, // flag to test
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
104 bool value) { // value to set
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
105 flags.set(mask, value);
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parents:
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106 }
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parents:
diff changeset
107
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parents:
diff changeset
108 C_OUTLINE_LIST *child() { // get child list
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 return &children;
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:
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110 }
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parents:
diff changeset
111
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
112 // access function
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
113 const TBOX &bounding_box() 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>
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114 return box;
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115 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
116 void set_step( // set a step
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
117 int16_t stepindex, // index of step
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
118 int8_t stepdir) { // chain code
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
119 int shift = stepindex % 4 * 2;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
120 uint8_t mask = 3 << shift;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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121 steps[stepindex / 4] = ((stepdir << shift) & mask) | (steps[stepindex / 4] & ~mask);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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122 // squeeze 4 into byte
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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123 }
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parents:
diff changeset
124 void set_step( // set a step
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parents:
diff changeset
125 int16_t stepindex, // index of step
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126 DIR128 stepdir) { // direction
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127 // clean it
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parents:
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128 int8_t chaindir = stepdir.get_dir() >> (DIRBITS - 2);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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129 // difference
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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130 set_step(stepindex, chaindir);
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Franz Glasner <fzglas.hg@dom66.de>
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131 // squeeze 4 into byte
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132 }
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133
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parents:
diff changeset
134 int32_t pathlength() const { // get path length
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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135 return stepcount;
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parents:
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136 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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137 // Return step at a given index as a DIR128.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
138 DIR128 step_dir(int index) 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:
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139 return DIR128(
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 static_cast<int16_t>(((steps[index / 4] >> (index % 4 * 2)) & STEP_MASK) << (DIRBITS - 2)));
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Franz Glasner <fzglas.hg@dom66.de>
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141 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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142 // Return the step vector for the given outline position.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
143 ICOORD step(int index) const { // index of 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:
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144 return step_coords[chain_code(index)];
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>
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145 }
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parents:
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146 // get start position
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
147 const ICOORD &start_pos() const {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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148 return start;
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149 }
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parents:
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150 // Returns the position at the given index on the outline.
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parents:
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151 // NOT to be used lightly, as it has to iterate the outline to find out.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
152 ICOORD position_at_index(int index) const {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
153 ICOORD pos = start;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
154 for (int i = 0; i < index; ++i) {
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
155 pos += step(i);
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156 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
157 return 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:
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158 }
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parents:
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159 // Returns the sub-pixel accurate position given the integer position pos
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parents:
diff changeset
160 // at the given index on the outline. pos may be a return value of
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
161 // position_at_index, or computed by repeatedly adding step to 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
162 // start_pos() in the usual way.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
163 FCOORD sub_pixel_pos_at_index(const ICOORD &pos, int index) 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
164 const ICOORD &step_to_next(step(index));
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 FCOORD f_pos(pos.x() + step_to_next.x() / 2.0f, pos.y() + step_to_next.y() / 2.0f);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
166 if (offsets != nullptr && offsets[index].pixel_diff > 0) {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
167 float offset = offsets[index].offset_numerator;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
168 offset /= offsets[index].pixel_diff;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
169 if (step_to_next.x() != 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
170 f_pos.set_y(f_pos.y() + offset);
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 } else {
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
172 f_pos.set_x(f_pos.x() + offset);
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parents:
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173 }
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parents:
diff changeset
174 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
175 return f_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
176 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
177 // Returns the step direction for the given index or -1 if there is none.
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 int direction_at_index(int index) 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
179 if (offsets != nullptr && offsets[index].pixel_diff > 0) {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
180 return offsets[index].direction;
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parents:
diff changeset
181 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
182 return -1;
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parents:
diff changeset
183 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
184 // Returns the edge strength for the given index.
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
185 // If there are no recorded edge strengths, returns 1 (assuming the image
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 // is binary). Returns 0 if the gradient direction conflicts with the
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
187 // step direction, indicating that this position could be skipped.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
188 int edge_strength_at_index(int index) 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
189 if (offsets != 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
190 return offsets[index].pixel_diff;
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 }
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 return 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
193 }
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 // Return the step as a chain code (0-3) related to the standard feature
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 // direction of binary_angle_plus_pi by:
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
196 // chain_code * 64 = feature direction.
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 int chain_code(int index) const { // index of 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
198 return (steps[index / 4] >> (index % 4 * 2)) & STEP_MASK;
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199 }
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200
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201 int32_t area() const; // Returns area of self and 1st level children.
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202 int32_t perimeter() const; // Total perimeter of self and 1st level children.
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203 int32_t outer_area() const; // Returns area of self only.
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204 int32_t count_transitions( // count maxima
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205 int32_t threshold); // size threshold
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206
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207 bool operator<( // containment test
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208 const C_OUTLINE &other) const;
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209 bool operator>( // containment test
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210 C_OUTLINE &other) const {
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211 return other < *this; // use the < to do it
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212 }
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213 int16_t winding_number( // get winding number
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214 ICOORD testpt) const; // around this point
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215 // get direction
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216 int16_t turn_direction() const;
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217 void reverse(); // reverse direction
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218
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219 void move( // reposition outline
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220 const ICOORD vec); // by vector
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221
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222 // Returns true if *this and its children are legally nested.
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223 // The outer area of a child should have the opposite sign to the
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224 // parent. If not, it means we have discarded an outline in between
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225 // (probably due to excessive length).
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226 bool IsLegallyNested() const;
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227
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228 // If this outline is smaller than the given min_size, delete this and
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229 // remove from its list, via *it, after checking that *it points to this.
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230 // Otherwise, if any children of this are too small, delete them.
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231 // On entry, *it must be an iterator pointing to this. If this gets deleted
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232 // then this is extracted from *it, so an iteration can continue.
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233 void RemoveSmallRecursive(int min_size, C_OUTLINE_IT *it);
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234
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235 // Adds sub-pixel resolution EdgeOffsets for the outline if the supplied
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236 // pix is 8-bit. Does nothing otherwise.
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237 void ComputeEdgeOffsets(int threshold, Image pix);
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238 // Adds sub-pixel resolution EdgeOffsets for the outline using only
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239 // a binary image source.
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240 void ComputeBinaryOffsets();
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241
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242 // Renders the outline to the given pix, with left and top being
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243 // the coords of the upper-left corner of the pix.
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244 void render(int left, int top, Image pix) const;
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245
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246 // Renders just the outline to the given pix (no fill), with left and top
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247 // being the coords of the upper-left corner of the pix.
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248 void render_outline(int left, int top, Image pix) const;
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249
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250 #ifndef GRAPHICS_DISABLED
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251 void plot( // draw one
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252 ScrollView *window, // window to draw in
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253 ScrollView::Color colour) const; // colour to draw it
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254 // Draws the outline in the given colour, normalized using the given denorm,
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255 // making use of sub-pixel accurate information if available.
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256 void plot_normed(const DENORM &denorm, ScrollView::Color colour, ScrollView *window) const;
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257 #endif // !GRAPHICS_DISABLED
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258
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259 C_OUTLINE &operator=(const C_OUTLINE &source);
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260
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261 static C_OUTLINE *deep_copy(const C_OUTLINE *src) {
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262 auto *outline = new C_OUTLINE;
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263 *outline = *src;
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264 return outline;
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265 }
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266
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267 static ICOORD chain_step(int chaindir);
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268
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269 // The maximum length of any outline. The stepcount is stored as 16 bits,
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270 // but it is probably not a good idea to increase this constant by much
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271 // and switch to 32 bits, as it plays an important role in keeping huge
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272 // outlines invisible, which prevents bad speed behavior.
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273 static const int kMaxOutlineLength = 16000;
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274
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275 private:
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276 // Helper for ComputeBinaryOffsets. Increments pos, dir_counts, pos_totals
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277 // by the step, increment, and vertical step ? x : y position * increment
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278 // at step s Mod stepcount respectively. Used to add or subtract the
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279 // direction and position to/from accumulators of a small neighbourhood.
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280 void increment_step(int s, int increment, ICOORD *pos, int *dir_counts, int *pos_totals) const;
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281 int step_mem() const {
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282 return (stepcount + 3) / 4;
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283 }
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284
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285 TBOX box; // bounding box
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286 ICOORD start; // start coord
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287 int16_t stepcount; // no of steps
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288 std::bitset<16> flags; // flags about outline
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289 std::vector<uint8_t> steps; // step array
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290 EdgeOffset *offsets; // Higher precision edge.
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291 C_OUTLINE_LIST children; // child elements
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292 static ICOORD step_coords[4];
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293 };
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294
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295 } // namespace tesseract
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296
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297 #endif