annotate mupdf-source/thirdparty/leptonica/src/ccbord_internal.h @ 46:7ee69f120f19 default tip

>>>>> 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
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1 /*====================================================================*
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2 - Copyright (C) 2001 Leptonica. All rights reserved.
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3 -
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4 - Redistribution and use in source and binary forms, with or without
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5 - modification, are permitted provided that the following conditions
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6 - are met:
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7 - 1. Redistributions of source code must retain the above copyright
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8 - notice, this list of conditions and the following disclaimer.
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9 - 2. Redistributions in binary form must reproduce the above
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10 - copyright notice, this list of conditions and the following
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11 - disclaimer in the documentation and/or other materials
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12 - provided with the distribution.
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13 -
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14 - THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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15 - ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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16 - LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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17 - A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL ANY
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18 - CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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19 - EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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20 - PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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21 - PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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22 - OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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23 - NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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24 - SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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25 *====================================================================*/
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26
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27 #ifndef LEPTONICA_CCBORD_INTERNAL_H
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28 #define LEPTONICA_CCBORD_INTERNAL_H
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29
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30 /*!
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31 * \file ccbord_internal.h
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32 *
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33 * <pre>
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34 *
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35 * This file is internal; it is not part of the public interface.
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36 * It contains definitions of data structures that use border pixels
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37 * of connected components to represent the foreground pixels
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38 * in an image by the border
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39 *
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40 * CCBord: represents a single connected component
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41 * CCBorda: an array of CCBord
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42 *
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43 * The CCBord contains:
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44 *
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45 * (1) a minimally-clipped bitmap of the component (pix),
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46 * (2) a boxa consisting of:
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47 * for the primary component:
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48 * (xul, yul) pixel location in global coords
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49 * (w, h) of the bitmap
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50 * for the hole components:
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51 * (x, y) in relative coordinates in primary component
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52 * (w, h) of the hole border (which is 2 pixels
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53 * larger in each direction than the hole itself)
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54 * (3) a pta ('start') of the initial border pixel location for each
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55 * closed curve, all in relative coordinates of the primary
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56 * component. This is given for the primary component,
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57 * followed by the hole components, if any.
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58 * (4) a refcount of the ccbord; used internally when a ccbord
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59 * is accessed from a ccborda (array of ccbord)
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60 * (5) a ptaa for the chain code for the border in relative
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61 * coordinates, where the first pta is the exterior border
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62 * and all other pta are for interior borders (holes)
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63 * (6) a ptaa for the global pixel loc rendition of the border,
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64 * where the first pta is the exterior border and all other
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65 * pta are for interior borders (holes).
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66 * This is derived from the local or step chain code.
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67 * (7) a numaa for the chain code for the border as orientation
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68 * directions between successive border pixels, where
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69 * the first numa is the exterior border and all other
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70 * numa are for interior borders (holes). This is derived
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71 * from the local chain code. The 8 directions are 0 - 7.
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72 * (8) a pta for a single chain for each c.c., comprised of outer
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73 * and hole borders, plus cut paths between them, all in
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74 * local coords.
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75 * (9) a pta for a single chain for each c.c., comprised of outer
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76 * and hole borders, plus cut paths between them, all in
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77 * global coords.
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78 * </pre>
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79 */
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80
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81 /*! A single CCBord for a connected component */
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82 struct CCBord
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83 {
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84 struct Pix *pix; /*!< component bitmap (min size) */
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85 struct Boxa *boxa; /*!< regions of each closed curve */
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86 struct Pta *start; /*!< initial border pixel locations */
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87 l_atomic refcount; /*!< number of handles; start at 1 */
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88 struct Ptaa *local; /*!< ptaa of chain pixels (local) */
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89 struct Ptaa *global; /*!< ptaa of chain pixels (global) */
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90 struct Numaa *step; /*!< numaa of chain code (step dir) */
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91 struct Pta *splocal; /*!< pta of single chain (local) */
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92 struct Pta *spglobal; /*!< pta of single chain (global) */
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93 };
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94
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95 /*! Array of CCBord */
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96 struct CCBorda
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97 {
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98 struct Pix *pix; /*!< input pix (may be null) */
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99 l_int32 w; /*!< width of pix */
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100 l_int32 h; /*!< height of pix */
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101 l_int32 n; /*!< number of ccbord in ptr array */
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102 l_int32 nalloc; /*!< number of ccbord ptrs allocated */
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103 struct CCBord **ccb; /*!< ccb ptr array */
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104 };
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105
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106 #endif /* LEPTONICA_CCBORD_INTERNAL_H */
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107