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comparison mupdf-source/thirdparty/tesseract/src/ccstruct/polyblk.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: polyblk.h (Formerly poly_block.h)
3 * Description: Polygonal blocks
4 *
5 * (C) Copyright 1993, Hewlett-Packard Ltd.
6 ** Licensed under the Apache License, Version 2.0 (the "License");
7 ** you may not use this file except in compliance with the License.
8 ** You may obtain a copy of the License at
9 ** http://www.apache.org/licenses/LICENSE-2.0
10 ** Unless required by applicable law or agreed to in writing, software
11 ** distributed under the License is distributed on an "AS IS" BASIS,
12 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 ** See the License for the specific language governing permissions and
14 ** limitations under the License.
15 *
16 **********************************************************************/
17
18 #ifndef POLYBLK_H
19 #define POLYBLK_H
20
21 #include "elst.h"
22 #include "points.h"
23 #include "rect.h"
24 #include "scrollview.h"
25
26 #include <tesseract/publictypes.h>
27
28 namespace tesseract {
29
30 class TESS_API POLY_BLOCK {
31 public:
32 POLY_BLOCK() = default;
33 // Initialize from box coordinates.
34 POLY_BLOCK(const TBOX &tbox, PolyBlockType type);
35 POLY_BLOCK(ICOORDELT_LIST *points, PolyBlockType type);
36 ~POLY_BLOCK() = default;
37
38 TBOX *bounding_box() { // access function
39 return &box;
40 }
41
42 ICOORDELT_LIST *points() { // access function
43 return &vertices;
44 }
45
46 void compute_bb();
47
48 PolyBlockType isA() const {
49 return type;
50 }
51
52 bool IsText() const {
53 return PTIsTextType(type);
54 }
55
56 // Rotate about the origin by the given rotation. (Analogous to
57 // multiplying by a complex number.
58 void rotate(FCOORD rotation);
59 // Reflect the coords of the polygon in the y-axis. (Flip the sign of x.)
60 void reflect_in_y_axis();
61 // Move by adding shift to all coordinates.
62 void move(ICOORD shift);
63
64 #ifndef GRAPHICS_DISABLED
65
66 void plot(ScrollView *window, int32_t num);
67
68 void fill(ScrollView *window, ScrollView::Color colour);
69 #endif // !GRAPHICS_DISABLED
70
71 // Returns true if other is inside this.
72 bool contains(POLY_BLOCK *other);
73
74 // Returns true if the polygons of other and this overlap.
75 bool overlap(POLY_BLOCK *other);
76
77 // Returns the winding number of this around the test_pt.
78 // Positive for anticlockwise, negative for clockwise, and zero for
79 // test_pt outside this.
80 int16_t winding_number(const ICOORD &test_pt);
81
82 #ifndef GRAPHICS_DISABLED
83 // Static utility functions to handle the PolyBlockType.
84 // Returns a color to draw the given type.
85 static ScrollView::Color ColorForPolyBlockType(PolyBlockType type);
86 #endif // !GRAPHICS_DISABLED
87
88 private:
89 ICOORDELT_LIST vertices; // vertices
90 TBOX box; // bounding box
91 PolyBlockType type; // Type of this region.
92 };
93
94 // Class to iterate the scanlines of a polygon.
95 class PB_LINE_IT {
96 public:
97 PB_LINE_IT(POLY_BLOCK *blkptr) {
98 block = blkptr;
99 }
100
101 void set_to_block(POLY_BLOCK *blkptr) {
102 block = blkptr;
103 }
104
105 // Returns a list of runs of pixels for the given y coord.
106 // Each element of the returned list is the start (x) and extent(y) of
107 // a run inside the region.
108 // Delete the returned list after use.
109 ICOORDELT_LIST *get_line(TDimension y);
110
111 private:
112 POLY_BLOCK *block;
113 };
114
115 } // namespace tesseract
116
117 #endif