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

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>>>>> 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_HEAP_H
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28 #define LEPTONICA_HEAP_H
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29
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30 /*!
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31 * \file heap.h
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32 *
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33 * <pre>
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34 * Expandable priority queue configured as a heap for arbitrary void* data
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35 *
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36 * The L_Heap is used to implement a priority queue. The elements
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37 * in the heap are ordered in either increasing or decreasing key value.
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38 * The key is a float field 'keyval' that is required to be
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39 * contained in the elements of the queue.
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40 *
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41 * The heap is a simple binary tree with the following constraints:
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42 * - the key of each node is >= the keys of the two children
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43 * - the tree is complete, meaning that each level (1, 2, 4, ...)
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44 * is filled and the last level is filled from left to right
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45 *
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46 * The tree structure is implicit in the queue array, with the
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47 * array elements numbered as a breadth-first search of the tree
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48 * from left to right. It is thus guaranteed that the largest
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49 * (or smallest) key belongs to the first element in the array.
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50 *
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51 * Heap sort is used to sort the array. Once an array has been
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52 * sorted as a heap, it is convenient to use it as a priority queue,
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53 * because the min (or max) elements are always at the root of
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54 * the tree (element 0), and once removed, the heap can be
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55 * resorted in not more than log[n] steps, where n is the number
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56 * of elements on the heap. Likewise, if an arbitrary element is
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57 * added to the end of the array A, the sorted heap can be restored
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58 * in not more than log[n] steps.
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59 *
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60 * A L_Heap differs from a L_Queue in that the elements in the former
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61 * are sorted by a key. Internally, the array is maintained
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62 * as a queue, with a pointer to the end of the array. The
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63 * head of the array always remains at array[0]. The array is
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64 * maintained (sorted) as a heap. When an item is removed from
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65 * the head, the last item takes its place (thus reducing the
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66 * array length by 1), and this is followed by array element
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67 * swaps to restore the heap property. When an item is added,
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68 * it goes at the end of the array, and is swapped up to restore
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69 * the heap. If the ptr array is full, adding another item causes
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70 * the ptr array size to double.
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71 *
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72 * For further implementation details, see heap.c.
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73 * </pre>
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74 */
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75
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76 /*! Heap of arbitrary void* data */
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77 struct L_Heap
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78 {
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79 l_int32 nalloc; /*!< size of allocated ptr array */
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80 l_int32 n; /*!< number of elements stored in the heap */
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81 void **array; /*!< ptr array */
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82 l_int32 direction; /*!< L_SORT_INCREASING or L_SORT_DECREASING */
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83 };
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84 typedef struct L_Heap L_HEAP;
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85
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86
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87 #endif /* LEPTONICA_HEAP_H */