Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/brotli/c/enc/block_splitter.c @ 46:7ee69f120f19 default tip

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
>>>>> 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 2013 Google Inc. All Rights Reserved.
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2
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3 Distributed under MIT license.
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4 See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
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5 */
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7 /* Block split point selection utilities. */
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8
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9 #include "block_splitter.h"
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10
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11 #include <string.h> /* memcpy, memset */
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12
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13 #include "../common/platform.h"
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14 #include "bit_cost.h"
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15 #include "cluster.h"
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16 #include "command.h"
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17 #include "fast_log.h"
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18 #include "histogram.h"
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19 #include "memory.h"
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20 #include "quality.h"
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21
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22 #if defined(__cplusplus) || defined(c_plusplus)
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23 extern "C" {
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24 #endif
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26 static const size_t kMaxLiteralHistograms = 100;
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27 static const size_t kMaxCommandHistograms = 50;
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28 static const double kLiteralBlockSwitchCost = 28.1;
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29 static const double kCommandBlockSwitchCost = 13.5;
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30 static const double kDistanceBlockSwitchCost = 14.6;
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31 static const size_t kLiteralStrideLength = 70;
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32 static const size_t kCommandStrideLength = 40;
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33 static const size_t kDistanceStrideLength = 40;
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34 static const size_t kSymbolsPerLiteralHistogram = 544;
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35 static const size_t kSymbolsPerCommandHistogram = 530;
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36 static const size_t kSymbolsPerDistanceHistogram = 544;
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37 static const size_t kMinLengthForBlockSplitting = 128;
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38 static const size_t kIterMulForRefining = 2;
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39 static const size_t kMinItersForRefining = 100;
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40
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41 static size_t CountLiterals(const Command* cmds, const size_t num_commands) {
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42 /* Count how many we have. */
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43 size_t total_length = 0;
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44 size_t i;
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45 for (i = 0; i < num_commands; ++i) {
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46 total_length += cmds[i].insert_len_;
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47 }
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48 return total_length;
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49 }
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51 static void CopyLiteralsToByteArray(const Command* cmds,
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52 const size_t num_commands,
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53 const uint8_t* data,
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54 const size_t offset,
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55 const size_t mask,
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56 uint8_t* literals) {
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57 size_t pos = 0;
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58 size_t from_pos = offset & mask;
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59 size_t i;
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60 for (i = 0; i < num_commands; ++i) {
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61 size_t insert_len = cmds[i].insert_len_;
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62 if (from_pos + insert_len > mask) {
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63 size_t head_size = mask + 1 - from_pos;
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64 memcpy(literals + pos, data + from_pos, head_size);
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65 from_pos = 0;
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66 pos += head_size;
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67 insert_len -= head_size;
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68 }
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69 if (insert_len > 0) {
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70 memcpy(literals + pos, data + from_pos, insert_len);
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71 pos += insert_len;
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72 }
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73 from_pos = (from_pos + insert_len + CommandCopyLen(&cmds[i])) & mask;
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74 }
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75 }
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76
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77 static BROTLI_INLINE uint32_t MyRand(uint32_t* seed) {
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78 /* Initial seed should be 7. In this case, loop length is (1 << 29). */
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79 *seed *= 16807U;
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80 return *seed;
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81 }
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82
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83 static BROTLI_INLINE double BitCost(size_t count) {
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84 return count == 0 ? -2.0 : FastLog2(count);
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85 }
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86
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87 #define HISTOGRAMS_PER_BATCH 64
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88 #define CLUSTERS_PER_BATCH 16
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89
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90 #define FN(X) X ## Literal
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91 #define DataType uint8_t
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92 /* NOLINTNEXTLINE(build/include) */
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93 #include "block_splitter_inc.h"
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94 #undef DataType
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95 #undef FN
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96
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97 #define FN(X) X ## Command
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98 #define DataType uint16_t
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99 /* NOLINTNEXTLINE(build/include) */
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100 #include "block_splitter_inc.h"
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101 #undef FN
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102
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103 #define FN(X) X ## Distance
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104 /* NOLINTNEXTLINE(build/include) */
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diff changeset
105 #include "block_splitter_inc.h"
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106 #undef DataType
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107 #undef FN
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108
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109 void BrotliInitBlockSplit(BlockSplit* self) {
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110 self->num_types = 0;
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111 self->num_blocks = 0;
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112 self->types = 0;
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113 self->lengths = 0;
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114 self->types_alloc_size = 0;
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115 self->lengths_alloc_size = 0;
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116 }
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117
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118 void BrotliDestroyBlockSplit(MemoryManager* m, BlockSplit* self) {
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119 BROTLI_FREE(m, self->types);
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120 BROTLI_FREE(m, self->lengths);
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121 }
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122
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123 /* Extracts literals, command distance and prefix codes, then applies
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124 * SplitByteVector to create partitioning. */
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125 void BrotliSplitBlock(MemoryManager* m,
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126 const Command* cmds,
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127 const size_t num_commands,
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128 const uint8_t* data,
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129 const size_t pos,
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130 const size_t mask,
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131 const BrotliEncoderParams* params,
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132 BlockSplit* literal_split,
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133 BlockSplit* insert_and_copy_split,
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134 BlockSplit* dist_split) {
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135 {
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136 size_t literals_count = CountLiterals(cmds, num_commands);
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137 uint8_t* literals = BROTLI_ALLOC(m, uint8_t, literals_count);
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138 if (BROTLI_IS_OOM(m) || BROTLI_IS_NULL(literals)) return;
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139 /* Create a continuous array of literals. */
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140 CopyLiteralsToByteArray(cmds, num_commands, data, pos, mask, literals);
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141 /* Create the block split on the array of literals.
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142 * Literal histograms can have alphabet size up to 256.
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143 * Though, to accomodate context modeling, less than half of maximum size
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144 * is allowed. */
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145 SplitByteVectorLiteral(
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diff changeset
146 m, literals, literals_count,
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147 kSymbolsPerLiteralHistogram, kMaxLiteralHistograms,
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148 kLiteralStrideLength, kLiteralBlockSwitchCost, params,
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149 literal_split);
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diff changeset
150 if (BROTLI_IS_OOM(m)) return;
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151 BROTLI_FREE(m, literals);
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152 /* NB: this might be a good place for injecting extra splitting without
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153 * increasing encoder complexity; however, output parition would be less
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154 * optimal than one produced with forced splitting inside
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155 * SplitByteVector (FindBlocks / ClusterBlocks). */
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156 }
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diff changeset
157
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diff changeset
158 {
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diff changeset
159 /* Compute prefix codes for commands. */
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parents:
diff changeset
160 uint16_t* insert_and_copy_codes = BROTLI_ALLOC(m, uint16_t, num_commands);
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diff changeset
161 size_t i;
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diff changeset
162 if (BROTLI_IS_OOM(m) || BROTLI_IS_NULL(insert_and_copy_codes)) return;
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parents:
diff changeset
163 for (i = 0; i < num_commands; ++i) {
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diff changeset
164 insert_and_copy_codes[i] = cmds[i].cmd_prefix_;
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165 }
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parents:
diff changeset
166 /* Create the block split on the array of command prefixes. */
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parents:
diff changeset
167 SplitByteVectorCommand(
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diff changeset
168 m, insert_and_copy_codes, num_commands,
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diff changeset
169 kSymbolsPerCommandHistogram, kMaxCommandHistograms,
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diff changeset
170 kCommandStrideLength, kCommandBlockSwitchCost, params,
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diff changeset
171 insert_and_copy_split);
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diff changeset
172 if (BROTLI_IS_OOM(m)) return;
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parents:
diff changeset
173 /* TODO(eustas): reuse for distances? */
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parents:
diff changeset
174 BROTLI_FREE(m, insert_and_copy_codes);
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diff changeset
175 }
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diff changeset
176
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diff changeset
177 {
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parents:
diff changeset
178 /* Create a continuous array of distance prefixes. */
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parents:
diff changeset
179 uint16_t* distance_prefixes = BROTLI_ALLOC(m, uint16_t, num_commands);
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diff changeset
180 size_t j = 0;
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parents:
diff changeset
181 size_t i;
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parents:
diff changeset
182 if (BROTLI_IS_OOM(m) || BROTLI_IS_NULL(distance_prefixes)) return;
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parents:
diff changeset
183 for (i = 0; i < num_commands; ++i) {
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parents:
diff changeset
184 const Command* cmd = &cmds[i];
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parents:
diff changeset
185 if (CommandCopyLen(cmd) && cmd->cmd_prefix_ >= 128) {
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parents:
diff changeset
186 distance_prefixes[j++] = cmd->dist_prefix_ & 0x3FF;
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187 }
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188 }
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parents:
diff changeset
189 /* Create the block split on the array of distance prefixes. */
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
190 SplitByteVectorDistance(
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
191 m, distance_prefixes, j,
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parents:
diff changeset
192 kSymbolsPerDistanceHistogram, kMaxCommandHistograms,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
193 kDistanceStrideLength, kDistanceBlockSwitchCost, params,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
194 dist_split);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
195 if (BROTLI_IS_OOM(m)) return;
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parents:
diff changeset
196 BROTLI_FREE(m, distance_prefixes);
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diff changeset
197 }
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198 }
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199
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200 #if defined(BROTLI_TEST)
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201 size_t CountLiteralsForTest(const Command*, const size_t);
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202 size_t CountLiteralsForTest(const Command* cmds, const size_t num_commands) {
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203 return CountLiterals(cmds, num_commands);
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204 }
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205
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206 void CopyLiteralsToByteArrayForTest(const Command*,
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207 const size_t, const uint8_t*, const size_t, const size_t, uint8_t*);
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208 void CopyLiteralsToByteArrayForTest(const Command* cmds,
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209 const size_t num_commands, const uint8_t* data, const size_t offset,
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210 const size_t mask, uint8_t* literals) {
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211 CopyLiteralsToByteArray(cmds, num_commands, data, offset, mask, literals);
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212 }
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213 #endif
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214
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215 #if defined(__cplusplus) || defined(c_plusplus)
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216 } /* extern "C" */
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217 #endif