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comparison mupdf-source/thirdparty/tesseract/src/ccstruct/pdblock.h @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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1:1d09e1dec1d9 2:b50eed0cc0ef
1 /**********************************************************************
2 * File: pdblock.h (Formerly pdblk.h)
3 * Description: Page block class definition.
4 * Author: Ray Smith
5 *
6 * (C) Copyright 1991, Hewlett-Packard Ltd.
7 ** Licensed under the Apache License, Version 2.0 (the "License");
8 ** you may not use this file except in compliance with the License.
9 ** You may obtain a copy of the License at
10 ** http://www.apache.org/licenses/LICENSE-2.0
11 ** Unless required by applicable law or agreed to in writing, software
12 ** distributed under the License is distributed on an "AS IS" BASIS,
13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 ** See the License for the specific language governing permissions and
15 ** limitations under the License.
16 *
17 **********************************************************************/
18
19 #ifndef PDBLOCK_H
20 #define PDBLOCK_H
21
22 #include "clst.h"
23 #include "polyblk.h"
24
25 struct Pix;
26
27 namespace tesseract {
28
29 class PDBLK; // forward decl
30
31 CLISTIZEH(PDBLK)
32 /// page block
33 class PDBLK {
34 friend class BLOCK_RECT_IT; ///< block iterator
35 friend class BLOCK; ///< Page Block
36
37 public:
38 /// empty constructor
39 PDBLK() {
40 hand_poly = nullptr;
41 index_ = 0;
42 }
43 /// simple constructor
44 PDBLK(TDimension xmin, ///< bottom left
45 TDimension ymin,
46 TDimension xmax, ///< top right
47 TDimension ymax);
48
49 /// set vertex lists
50 ///@param left list of left vertices
51 ///@param right list of right vertices
52 void set_sides(ICOORDELT_LIST *left, ICOORDELT_LIST *right);
53
54 /// destructor
55 ~PDBLK() {
56 delete hand_poly;
57 }
58
59 POLY_BLOCK *poly_block() const {
60 return hand_poly;
61 }
62 /// set the poly block
63 void set_poly_block(POLY_BLOCK *blk) {
64 hand_poly = blk;
65 }
66 /// get box
67 void bounding_box(ICOORD &bottom_left, // bottom left
68 ICOORD &top_right) const { // topright
69 bottom_left = box.botleft();
70 top_right = box.topright();
71 }
72 /// get real box
73 const TBOX &bounding_box() const {
74 return box;
75 }
76
77 int index() const {
78 return index_;
79 }
80 void set_index(int value) {
81 index_ = value;
82 }
83
84 /// is pt inside block
85 bool contains(ICOORD pt);
86
87 /// reposition block
88 void move(const ICOORD vec); // by vector
89
90 // Returns a binary Pix mask with a 1 pixel for every pixel within the
91 // block. Rotates the coordinate system by rerotation prior to rendering.
92 // If not nullptr, mask_box is filled with the position box of the returned
93 // mask image.
94 Image render_mask(const FCOORD &rerotation, TBOX *mask_box);
95
96 #ifndef GRAPHICS_DISABLED
97 /// draw histogram
98 ///@param window window to draw in
99 ///@param serial serial number
100 ///@param colour colour to draw in
101 void plot(ScrollView *window, int32_t serial, ScrollView::Color colour);
102 #endif // !GRAPHICS_DISABLED
103
104 /// assignment
105 ///@param source from this
106 PDBLK &operator=(const PDBLK &source);
107
108 protected:
109 POLY_BLOCK *hand_poly; ///< weird as well
110 ICOORDELT_LIST leftside; ///< left side vertices
111 ICOORDELT_LIST rightside; ///< right side vertices
112 TBOX box; ///< bounding box
113 int index_; ///< Serial number of this block.
114 };
115
116 class BLOCK_RECT_IT // rectangle iterator
117 {
118 public:
119 /// constructor
120 ///@param blkptr block to iterate
121 BLOCK_RECT_IT(PDBLK *blkptr);
122
123 /// start (new) block
124 void set_to_block(PDBLK *blkptr); // block to iterate
125
126 /// start iteration
127 void start_block();
128
129 /// next rectangle
130 void forward();
131
132 /// test end
133 bool cycled_rects() const {
134 return left_it.cycled_list() && right_it.cycled_list();
135 }
136
137 /// current rectangle
138 ///@param bleft bottom left
139 ///@param tright top right
140 void bounding_box(ICOORD &bleft, ICOORD &tright) {
141 // bottom left
142 bleft = ICOORD(left_it.data()->x(), ymin);
143 // top right
144 tright = ICOORD(right_it.data()->x(), ymax);
145 }
146
147 private:
148 TDimension ymin = 0; ///< bottom of rectangle
149 TDimension ymax = 0; ///< top of rectangle
150 PDBLK *block = nullptr; ///< block to iterate
151 ICOORDELT_IT left_it; ///< boundary iterators
152 ICOORDELT_IT right_it;
153 };
154
155 /// rectangle iterator
156 class BLOCK_LINE_IT {
157 public:
158 /// constructor
159 ///@param blkptr from block
160 BLOCK_LINE_IT(PDBLK *blkptr) : rect_it(blkptr) {
161 block = blkptr; // remember block
162 }
163
164 /// start (new) block
165 ///@param blkptr block to start
166 void set_to_block(PDBLK *blkptr) {
167 block = blkptr; // remember block
168 // set iterator
169 rect_it.set_to_block(blkptr);
170 }
171
172 /// get a line
173 ///@param y line to get
174 ///@param xext output extent
175 TDimension get_line(TDimension y, TDimension &xext);
176
177 private:
178 PDBLK *block; ///< block to iterate
179 BLOCK_RECT_IT rect_it; ///< rectangle iterator
180 };
181
182 } // namespace tesseract
183
184 #endif