Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/include/mupdf/fitz/heap.h @ 40:aa33339d6b8a upstream

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ADD: MuPDF v1.26.10: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.5.
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 11:31:38 +0200
parents b50eed0cc0ef
children
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1 // Copyright (C) 2004-2025 Artifex Software, Inc.
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2 //
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3 // This file is part of MuPDF.
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4 //
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5 // MuPDF is free software: you can redistribute it and/or modify it under the
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6 // terms of the GNU Affero General Public License as published by the Free
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7 // Software Foundation, either version 3 of the License, or (at your option)
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8 // any later version.
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9 //
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10 // MuPDF is distributed in the hope that it will be useful, but WITHOUT ANY
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11 // WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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12 // FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
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13 // details.
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14 //
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15 // You should have received a copy of the GNU Affero General Public License
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16 // along with MuPDF. If not, see <https://www.gnu.org/licenses/agpl-3.0.en.html>
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17 //
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18 // Alternative licensing terms are available from the licensor.
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19 // For commercial licensing, see <https://www.artifex.com/> or contact
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20 // Artifex Software, Inc., 39 Mesa Street, Suite 108A, San Francisco,
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21 // CA 94129, USA, for further information.
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22
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23 /* This file has preprocessor magic in it to instantiate both
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24 * prototypes and implementations for heap sorting structures
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25 * of various different types. Effectively, it's templating for
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26 * C.
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27 *
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28 * If you are including this file directly without intending to
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29 * be instantiating a new set of heap sort functions, you are
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30 * doing the wrong thing.
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31 */
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32
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33 /* This header file declares some useful heap functions. (Heap
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34 * as in heap sort, not as in memory heap). It uses some
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35 * clever (read "hacky") multiple inclusion techniques to allow
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36 * us to generate multiple different versions of this code.
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37 * This is kinda like 'templating' in C++, but without language
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38 * support.
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39 */
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40
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41 /* For every instance of this code, we end up a heap structure:
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42 *
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43 * typedef struct
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44 * {
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45 * int max;
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46 * int len;
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47 * <TYPE> *heap;
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48 * } fz_<TYPE>_heap;
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49 *
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50 * This can be created and initialised on the stack in user code using:
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51 *
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52 * fz_<TYPE>_heap heap = { 0 };
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53 *
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54 * and some functions.
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55 *
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56 * When <TYPE> is a simple int (or float or similar), the ordering required is
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57 * obvious, and so the functions are simple (Form 1):
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58 *
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59 * First some to insert elements into the heap:
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60 *
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61 * void fz_<TYPE>_heap_insert(fz_context *ctx, fz_<TYPE>_heap *heap, <TYPE> v);
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62 *
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63 * Once all the elements have been inserted, the heap can be sorted:
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64 *
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65 * void fz_<TYPE>_heap_sort(fz_context *ctx, fz_<TYPE>_heap *heap);
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66 *
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67 * Once sorted, repeated elements can be removed:
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68 *
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69 * void fz_<TYPE>_heap_uniq(fz_context *ctx, fz_<TYPE>_heap *heap);
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70 *
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71 *
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72 * For more complex TYPEs (such as pointers) the ordering may not be implicit within the <TYPE>,
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73 * but rather depends upon the data found by dereferencing those pointers. For such types,
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74 * the functions are modified with a <COMPARE> function, of the form used by qsort etc:
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75 *
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76 * int <COMPARE>(<TYPE>x, <TYPE>y) that returns 0 for x == y, +ve for x > y, and -ve for x < y.
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77 *
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78 * The functions are modified thus (Form 2):
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79 *
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80 * void fz_<TYPE>_heap_insert(fz_context *ctx, fz_<TYPE>_heap *heap, <TYPE> v, <COMPARE> t);
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81 * void fz_<TYPE>_heap_sort(fz_context *ctx, fz_<TYPE>_heap *heap, <COMPARE> t);
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82 * void fz_<TYPE>_heap_uniq(fz_context *ctx, fz_<TYPE>_heap *heap, <COMPARE> t);
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83 *
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84 * Currently, we define:
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85 *
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86 * fz_int_heap Operates on 'int' values. Form 1.
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87 * fz_ptr_heap Operates on 'void *' values. Form 2.
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88 * fz_int2_heap Operates on 'typedef struct { int a; int b} fz_int2' values,
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89 * with the sort/uniq being done based on 'a' alone. Form 1.
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90 * fz_intptr_heap Operates on 'typedef struct { int a; void *b} fz_intptr' values,
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91 * with the sort/uniq being done based on 'a' alone. Form 1.
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92 */
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93
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94 /* Everything after this point is preprocessor magic. Ignore it, and just read the above
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95 * unless you are wanting to instantiate a new set of functions. */
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96
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97 #ifndef MUPDF_FITZ_HEAP_H
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98
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99 #define MUPDF_FITZ_HEAP_H
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100
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101 #define MUPDF_FITZ_HEAP_I_KNOW_WHAT_IM_DOING
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102
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103 /* Instantiate fz_int_heap */
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104 #define HEAP_TYPE_NAME fz_int_heap
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105 #define HEAP_CONTAINER_TYPE int
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106 #define HEAP_CMP(a,b) ((*a) - (*b))
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107 #define HEAP_DUMP(CTX, OUT, I, A) fz_write_printf(CTX, OUT, "%d: %d\n", I, *A)
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108 #include "mupdf/fitz/heap-imp.h"
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109
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110 /* Instantiate fz_ptr_heap */
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111 #define HEAP_TYPE_NAME fz_ptr_heap
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112 #define HEAP_CONTAINER_TYPE void *
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113 #include "mupdf/fitz/heap-imp.h"
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114
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115 /* Instantiate fz_int2_heap */
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116 #ifndef MUPDF_FITZ_HEAP_IMPLEMENT
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117 typedef struct
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118 {
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119 int a;
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120 int b;
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121 } fz_int2;
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122 #endif
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123 #define HEAP_TYPE_NAME fz_int2_heap
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124 #define HEAP_CMP(A,B) (((A)->a) - ((B)->a))
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125 #define HEAP_CONTAINER_TYPE fz_int2
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126 #define HEAP_DUMP(CTX, OUT, I, A) fz_write_printf(CTX, OUT, "%d: %d %d\n", I, (A)->a, (A)->b)
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127 #include "mupdf/fitz/heap-imp.h"
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128
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129 /* Instantiate fz_intptr_heap */
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130 #ifndef MUPDF_FITZ_HEAP_IMPLEMENT
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131 typedef struct
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132 {
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133 int a;
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134 void *b;
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135 } fz_intptr;
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136 #endif
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137 #define HEAP_TYPE_NAME fz_intptr_heap
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138 #define HEAP_CONTAINER_TYPE fz_intptr
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139 #define HEAP_CMP(A,B) (((A)->a) - ((B)->a))
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140 #define HEAP_DUMP(CTX, OUT, I, A) fz_write_printf(CTX, OUT, "%d: %d %p\n", I, (A)->a, (A)->b)
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141 #include "mupdf/fitz/heap-imp.h"
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142
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143 #endif /* MUPDF_FITZ_HEAP_H */