Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/include/mupdf/fitz/heap-imp.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
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 #ifndef MUPDF_FITZ_HEAP_I_KNOW_WHAT_IM_DOING
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34 #error Do not include heap-imp.h unless you know what you are doing
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35 #endif
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36
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37 #define HEAP_XCAT(A,B) A##B
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38 #define HEAP_CAT(A,B) HEAP_XCAT(A,B)
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39
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40 #ifndef MUPDF_FITZ_HEAP_IMPLEMENT
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41 typedef struct
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42 {
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43 int max;
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44 int len;
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45 HEAP_CONTAINER_TYPE *heap;
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46 } HEAP_TYPE_NAME;
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47 #endif
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48
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49 void HEAP_CAT(HEAP_TYPE_NAME,_insert)(fz_context *ctx, HEAP_TYPE_NAME *heap, HEAP_CONTAINER_TYPE v
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50 #ifndef HEAP_CMP
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51 , int (*HEAP_CMP)(HEAP_CONTAINER_TYPE *a, HEAP_CONTAINER_TYPE *b)
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52 #endif
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53 )
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54 #ifndef MUPDF_FITZ_HEAP_IMPLEMENT
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55 ;
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56 #else
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57 {
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58 int i;
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59 HEAP_CONTAINER_TYPE *h;
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60
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61 if (heap->max == heap->len)
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62 {
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63 int m = heap->max * 2;
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64
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65 if (m == 0)
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66 m = 32;
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67
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68 heap->heap = (HEAP_CONTAINER_TYPE *)fz_realloc(ctx, heap->heap, sizeof(*heap->heap) * m);
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69 heap->max = m;
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70 }
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71 h = heap->heap;
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72
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73 /* Insert it into the heap. Consider inserting at position i, and
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74 * then 'heapify' back. We can delay the actual insertion to the
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75 * end of the process. */
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76 i = heap->len++;
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77 while (i != 0)
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78 {
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79 int parent_idx = (i-1)/2;
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80 HEAP_CONTAINER_TYPE *parent_val = &h[parent_idx];
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81 if (HEAP_CMP(parent_val, &v) > 0)
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82 break;
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83 h[i] = h[parent_idx];
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84 i = parent_idx;
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85 }
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86 h[i] = v;
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87 }
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88 #endif
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89
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90 void HEAP_CAT(HEAP_TYPE_NAME,_sort)(fz_context *ctx, HEAP_TYPE_NAME *heap
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91 #ifndef HEAP_CMP
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92 , int (*HEAP_CMP)(HEAP_CONTAINER_TYPE *a, HEAP_CONTAINER_TYPE *b)
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93 #endif
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94 )
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95 #ifndef MUPDF_FITZ_HEAP_IMPLEMENT
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96 ;
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97 #else
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98 {
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99 int j;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
100 HEAP_CONTAINER_TYPE *h = heap->heap;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
101
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
102 /* elements j to len are always sorted. 0 to j are always a valid heap. Gradually move j to 0. */
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
103 for (j = heap->len-1; j > 0; j--)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
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104 {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
105 int k;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
106 HEAP_CONTAINER_TYPE val;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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107
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parents:
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108 /* Swap max element with j. Invariant valid for next value to j. */
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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109 val = h[j];
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110 h[j] = h[0];
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parents:
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111 /* Now reform the heap. 0 to k is a valid heap. */
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parents:
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112 k = 0;
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Franz Glasner <fzglas.hg@dom66.de>
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113 while (1)
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114 {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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115 int kid = k*2+1;
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116 if (kid >= j)
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117 break;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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118 if (kid+1 < j && (HEAP_CMP(&h[kid+1], &h[kid])) > 0)
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Franz Glasner <fzglas.hg@dom66.de>
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119 kid++;
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120 if ((HEAP_CMP(&val, &h[kid])) > 0)
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parents:
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121 break;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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122 h[k] = h[kid];
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123 k = kid;
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124 }
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125 h[k] = val;
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126 }
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127 }
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128 #endif
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129
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130 void HEAP_CAT(HEAP_TYPE_NAME,_uniq)(fz_context *ctx, HEAP_TYPE_NAME *heap
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131 #ifndef HEAP_CMP
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132 , int (*HEAP_CMP)(HEAP_CONTAINER_TYPE *a, HEAP_CONTAINER_TYPE *b)
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133 #endif
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134 )
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135 #ifndef MUPDF_FITZ_HEAP_IMPLEMENT
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136 ;
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137 #else
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138 {
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139 int n = heap->len;
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140 int i, j = 0;
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141 HEAP_CONTAINER_TYPE *h = heap->heap;
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142
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143 if (n == 0)
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144 return;
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145
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146 j = 0;
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147 for (i = 1; i < n; i++)
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parents:
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148 {
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parents:
diff changeset
149 if (HEAP_CMP(&h[j], &h[i]) == 0)
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diff changeset
150 continue;
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151 j++;
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diff changeset
152 if (i != j)
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153 h[j] = h[i];
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parents:
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154 }
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parents:
diff changeset
155 heap->len = j+1;
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parents:
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156 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
157 #endif
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
158
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diff changeset
159 #ifdef HEAP_DUMP
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diff changeset
160 void HEAP_CAT(HEAP_TYPE_NAME,_dump)(fz_context *ctx, fz_output *out, HEAP_TYPE_NAME *heap)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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diff changeset
161 #ifndef MUPDF_FITZ_HEAP_IMPLEMENT
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162 ;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
163 #else
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
164 {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
165 int n = heap->len;
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parents:
diff changeset
166 int i;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
167 HEAP_CONTAINER_TYPE *h = heap->heap;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
168
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
169 fz_write_printf(ctx, out, "Heap %p len %d:\n", heap, n);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
170 for (i = 0; i < n; i++)
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parents:
diff changeset
171 HEAP_DUMP(ctx, out, i, &h[i]);
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parents:
diff changeset
172 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
173 #endif
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
174
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
175 void HEAP_CAT(HEAP_TYPE_NAME,_debug)(fz_context *ctx, HEAP_TYPE_NAME *heap)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
176 #ifndef MUPDF_FITZ_HEAP_IMPLEMENT
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
177 ;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
178 #else
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
179 {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
180 HEAP_CAT(HEAP_TYPE_NAME,_dump)(ctx, fz_stddbg(ctx), heap);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
181 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
182 #endif
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
183 #endif
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
184
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
185 #undef HEAP_CONTAINER_TYPE
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
186 #undef HEAP_TYPE_NAME
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
187 #undef HEAP_CMP
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
188 #undef HEAP_XCAT
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
189 #undef HEAP_CAT
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
190 #undef HEAP_DUMP