Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/brotli/c/enc/quality.h @ 17:dd9cdb856310

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Remove PKG-INFO from the because it is regenerated automatically for the sdist
author Franz Glasner <fzglas.hg@dom66.de>
date Thu, 18 Sep 2025 17:40:40 +0200
parents b50eed0cc0ef
children
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1 /* Copyright 2016 Google Inc. All Rights Reserved.
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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 /* Constants and formulas that affect speed-ratio trade-offs and thus define
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8 quality levels. */
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10 #ifndef BROTLI_ENC_QUALITY_H_
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11 #define BROTLI_ENC_QUALITY_H_
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13 #include <brotli/encode.h>
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15 #include "../common/platform.h"
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16 #include "params.h"
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18 #define FAST_ONE_PASS_COMPRESSION_QUALITY 0
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19 #define FAST_TWO_PASS_COMPRESSION_QUALITY 1
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20 #define ZOPFLIFICATION_QUALITY 10
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21 #define HQ_ZOPFLIFICATION_QUALITY 11
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23 #define MAX_QUALITY_FOR_STATIC_ENTROPY_CODES 2
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24 #define MIN_QUALITY_FOR_BLOCK_SPLIT 4
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25 #define MIN_QUALITY_FOR_NONZERO_DISTANCE_PARAMS 4
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26 #define MIN_QUALITY_FOR_OPTIMIZE_HISTOGRAMS 4
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27 #define MIN_QUALITY_FOR_EXTENSIVE_REFERENCE_SEARCH 5
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28 #define MIN_QUALITY_FOR_CONTEXT_MODELING 5
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29 #define MIN_QUALITY_FOR_HQ_CONTEXT_MODELING 7
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30 #define MIN_QUALITY_FOR_HQ_BLOCK_SPLITTING 10
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32 /* For quality below MIN_QUALITY_FOR_BLOCK_SPLIT there is no block splitting,
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33 so we buffer at most this much literals and commands. */
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34 #define MAX_NUM_DELAYED_SYMBOLS 0x2FFF
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36 /* Returns hash-table size for quality levels 0 and 1. */
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37 static BROTLI_INLINE size_t MaxHashTableSize(int quality) {
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38 return quality == FAST_ONE_PASS_COMPRESSION_QUALITY ? 1 << 15 : 1 << 17;
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39 }
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41 /* The maximum length for which the zopflification uses distinct distances. */
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42 #define MAX_ZOPFLI_LEN_QUALITY_10 150
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43 #define MAX_ZOPFLI_LEN_QUALITY_11 325
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45 /* Do not thoroughly search when a long copy is found. */
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46 #define BROTLI_LONG_COPY_QUICK_STEP 16384
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48 static BROTLI_INLINE size_t MaxZopfliLen(const BrotliEncoderParams* params) {
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49 return params->quality <= 10 ?
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50 MAX_ZOPFLI_LEN_QUALITY_10 :
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51 MAX_ZOPFLI_LEN_QUALITY_11;
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52 }
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54 /* Number of best candidates to evaluate to expand Zopfli chain. */
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55 static BROTLI_INLINE size_t MaxZopfliCandidates(
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56 const BrotliEncoderParams* params) {
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57 return params->quality <= 10 ? 1 : 5;
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58 }
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60 static BROTLI_INLINE void SanitizeParams(BrotliEncoderParams* params) {
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61 params->quality = BROTLI_MIN(int, BROTLI_MAX_QUALITY,
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62 BROTLI_MAX(int, BROTLI_MIN_QUALITY, params->quality));
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63 if (params->quality <= MAX_QUALITY_FOR_STATIC_ENTROPY_CODES) {
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64 params->large_window = BROTLI_FALSE;
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65 }
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66 if (params->lgwin < BROTLI_MIN_WINDOW_BITS) {
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67 params->lgwin = BROTLI_MIN_WINDOW_BITS;
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68 } else {
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69 int max_lgwin = params->large_window ? BROTLI_LARGE_MAX_WINDOW_BITS :
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70 BROTLI_MAX_WINDOW_BITS;
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71 if (params->lgwin > max_lgwin) params->lgwin = max_lgwin;
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72 }
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73 }
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74
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75 /* Returns optimized lg_block value. */
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76 static BROTLI_INLINE int ComputeLgBlock(const BrotliEncoderParams* params) {
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77 int lgblock = params->lgblock;
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78 if (params->quality == FAST_ONE_PASS_COMPRESSION_QUALITY ||
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79 params->quality == FAST_TWO_PASS_COMPRESSION_QUALITY) {
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80 lgblock = params->lgwin;
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81 } else if (params->quality < MIN_QUALITY_FOR_BLOCK_SPLIT) {
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82 lgblock = 14;
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83 } else if (lgblock == 0) {
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84 lgblock = 16;
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85 if (params->quality >= 9 && params->lgwin > lgblock) {
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86 lgblock = BROTLI_MIN(int, 18, params->lgwin);
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87 }
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88 } else {
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89 lgblock = BROTLI_MIN(int, BROTLI_MAX_INPUT_BLOCK_BITS,
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90 BROTLI_MAX(int, BROTLI_MIN_INPUT_BLOCK_BITS, lgblock));
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91 }
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92 return lgblock;
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93 }
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94
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95 /* Returns log2 of the size of main ring buffer area.
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96 Allocate at least lgwin + 1 bits for the ring buffer so that the newly
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97 added block fits there completely and we still get lgwin bits and at least
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98 read_block_size_bits + 1 bits because the copy tail length needs to be
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99 smaller than ring-buffer size. */
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100 static BROTLI_INLINE int ComputeRbBits(const BrotliEncoderParams* params) {
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101 return 1 + BROTLI_MAX(int, params->lgwin, params->lgblock);
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102 }
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103
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104 static BROTLI_INLINE size_t MaxMetablockSize(
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105 const BrotliEncoderParams* params) {
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106 int bits =
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107 BROTLI_MIN(int, ComputeRbBits(params), BROTLI_MAX_INPUT_BLOCK_BITS);
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108 return (size_t)1 << bits;
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109 }
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110
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111 /* When searching for backward references and have not seen matches for a long
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112 time, we can skip some match lookups. Unsuccessful match lookups are very
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113 expensive and this kind of a heuristic speeds up compression quite a lot.
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114 At first 8 byte strides are taken and every second byte is put to hasher.
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115 After 4x more literals stride by 16 bytes, every put 4-th byte to hasher.
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116 Applied only to qualities 2 to 9. */
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117 static BROTLI_INLINE size_t LiteralSpreeLengthForSparseSearch(
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118 const BrotliEncoderParams* params) {
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119 return params->quality < 9 ? 64 : 512;
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120 }
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121
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122 /* Quality to hasher mapping:
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123
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124 - q02: h02 (longest_match_quickly), b16, l5
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125
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126 - q03: h03 (longest_match_quickly), b17, l5
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127
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128 - q04: h04 (longest_match_quickly), b17, l5
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129 - q04: h54 (longest_match_quickly), b20, l7 | for large files
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130
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131 - q05: h58 (longest_match_simd ), b14, l4
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132 - q05: h68 (longest_match64_simd ), b15, l5 | for large files
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133 - q05: h40 (forgetful_chain ), b15, l4 | for small window
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134
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135 - q06: h58 (longest_match_simd ), b14, l4
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136 - q06: h68 (longest_match64_simd ), b15, l5 | for large files
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137 - q06: h40 (forgetful_chain ), b15, l4 | for small window
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138
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139 - q07: h58 (longest_match_simd ), b15, l4
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140 - q07: h68 (longest_match64_simd ), b15, l5 | for large files
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141 - q07: h41 (forgetful_chain ), b15, l4 | for small window
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142
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143 - q08: h05 (longest_match ), b15, l4
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144 - q08: h06 (longest_match64 ), b15, l5 | for large files
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145 - q08: h41 (forgetful_chain ), b15, l4 | for small window
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146
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147 - q09: h05 (longest_match ), b15, l4
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148 - q09: h06 (longest_match64 ), b15, l5 | for large files
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149 - q09: h42 (forgetful_chain ), b15, l4 | for small window
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150
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151 - q10: t10 (to_binary_tree ), b17, l128
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152
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153 - q11: t10 (to_binary_tree ), b17, l128
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154
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155 Where "q" is quality, "h" is hasher type, "b" is bucket bits,
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156 "l" is source len. */
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157 static BROTLI_INLINE void ChooseHasher(const BrotliEncoderParams* params,
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158 BrotliHasherParams* hparams) {
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159 if (params->quality > 9) {
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160 hparams->type = 10;
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161 } else if (params->quality == 4 && params->size_hint >= (1 << 20)) {
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162 hparams->type = 54;
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163 } else if (params->quality < 5) {
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164 hparams->type = params->quality;
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165 } else if (params->lgwin <= 16) {
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166 hparams->type = params->quality < 7 ? 40 : params->quality < 9 ? 41 : 42;
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167 } else if (params->size_hint >= (1 << 20) && params->lgwin >= 19) {
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168 #if defined(BROTLI_MAX_SIMD_QUALITY)
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169 hparams->type = params->quality <= BROTLI_MAX_SIMD_QUALITY ? 68 : 6;
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170 #else
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171 hparams->type = 6;
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172 #endif
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173 hparams->block_bits = params->quality - 1;
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174 hparams->bucket_bits = 15;
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175 hparams->num_last_distances_to_check =
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176 params->quality < 7 ? 4 : params->quality < 9 ? 10 : 16;
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177 } else {
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178 /* TODO(eustas): often previous setting (H6) is faster and denser; consider
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179 adding an option to use it. */
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180 #if defined(BROTLI_MAX_SIMD_QUALITY)
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181 hparams->type = params->quality <= BROTLI_MAX_SIMD_QUALITY ? 58 : 5;
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182 #else
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183 hparams->type = 5;
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184 #endif
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185 hparams->block_bits = params->quality - 1;
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186 hparams->bucket_bits = params->quality < 7 ? 14 : 15;
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187 hparams->num_last_distances_to_check =
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188 params->quality < 7 ? 4 : params->quality < 9 ? 10 : 16;
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189 }
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190
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191 if (params->lgwin > 24) {
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192 /* Different hashers for large window brotli: not for qualities <= 2,
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193 these are too fast for large window. Not for qualities >= 10: their
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194 hasher already works well with large window. So the changes are:
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195 H3 --> H35: for quality 3.
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196 H54 --> H55: for quality 4 with size hint > 1MB
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197 H6/H68 --> H65: for qualities 5, 6, 7, 8, 9. */
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198 if (hparams->type == 3) {
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199 hparams->type = 35;
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200 }
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201 if (hparams->type == 54) {
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202 hparams->type = 55;
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203 }
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204 if (hparams->type == 6 || hparams->type == 68) {
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205 hparams->type = 65;
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206 }
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207 }
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208 }
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209
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210 #endif /* BROTLI_ENC_QUALITY_H_ */