Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/brotli/c/enc/metablock.h @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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1 /* Copyright 2015 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 /* Algorithms for distributing the literals and commands of a metablock between
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8 block types and contexts. */
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10 #ifndef BROTLI_ENC_METABLOCK_H_
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11 #define BROTLI_ENC_METABLOCK_H_
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13 #include <brotli/types.h>
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15 #include "../common/context.h"
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16 #include "../common/platform.h"
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17 #include "block_splitter.h"
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18 #include "command.h"
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19 #include "histogram.h"
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20 #include "memory.h"
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21 #include "quality.h"
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23 #if defined(__cplusplus) || defined(c_plusplus)
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24 extern "C" {
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25 #endif
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27 #define BROTLI_MAX_STATIC_CONTEXTS 13
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29 typedef struct MetaBlockSplit {
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30 BlockSplit literal_split;
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31 BlockSplit command_split;
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32 BlockSplit distance_split;
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33 uint32_t* literal_context_map;
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34 size_t literal_context_map_size;
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35 uint32_t* distance_context_map;
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36 size_t distance_context_map_size;
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37 HistogramLiteral* literal_histograms;
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38 size_t literal_histograms_size;
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39 HistogramCommand* command_histograms;
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40 size_t command_histograms_size;
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41 HistogramDistance* distance_histograms;
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42 size_t distance_histograms_size;
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43 } MetaBlockSplit;
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44
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45 static BROTLI_INLINE void InitMetaBlockSplit(MetaBlockSplit* mb) {
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46 BrotliInitBlockSplit(&mb->literal_split);
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47 BrotliInitBlockSplit(&mb->command_split);
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48 BrotliInitBlockSplit(&mb->distance_split);
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49 mb->literal_context_map = 0;
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50 mb->literal_context_map_size = 0;
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51 mb->distance_context_map = 0;
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52 mb->distance_context_map_size = 0;
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53 mb->literal_histograms = 0;
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54 mb->literal_histograms_size = 0;
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55 mb->command_histograms = 0;
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56 mb->command_histograms_size = 0;
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57 mb->distance_histograms = 0;
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58 mb->distance_histograms_size = 0;
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59 }
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60
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61 static BROTLI_INLINE void DestroyMetaBlockSplit(
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62 MemoryManager* m, MetaBlockSplit* mb) {
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63 BrotliDestroyBlockSplit(m, &mb->literal_split);
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64 BrotliDestroyBlockSplit(m, &mb->command_split);
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65 BrotliDestroyBlockSplit(m, &mb->distance_split);
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66 BROTLI_FREE(m, mb->literal_context_map);
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67 BROTLI_FREE(m, mb->distance_context_map);
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68 BROTLI_FREE(m, mb->literal_histograms);
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69 BROTLI_FREE(m, mb->command_histograms);
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70 BROTLI_FREE(m, mb->distance_histograms);
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71 }
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72
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73 /* Uses the slow shortest-path block splitter and does context clustering.
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74 The distance parameters are dynamically selected based on the commands
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75 which get recomputed under the new distance parameters. The new distance
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76 parameters are stored into *params. */
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77 BROTLI_INTERNAL void BrotliBuildMetaBlock(MemoryManager* m,
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78 const uint8_t* ringbuffer,
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79 const size_t pos,
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80 const size_t mask,
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81 BrotliEncoderParams* params,
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82 uint8_t prev_byte,
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83 uint8_t prev_byte2,
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84 Command* cmds,
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85 size_t num_commands,
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86 ContextType literal_context_mode,
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87 MetaBlockSplit* mb);
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88
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89 /* Uses a fast greedy block splitter that tries to merge current block with the
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90 last or the second last block and uses a static context clustering which
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91 is the same for all block types. */
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92 BROTLI_INTERNAL void BrotliBuildMetaBlockGreedy(
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93 MemoryManager* m, const uint8_t* ringbuffer, size_t pos, size_t mask,
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94 uint8_t prev_byte, uint8_t prev_byte2, ContextLut literal_context_lut,
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95 size_t num_contexts, const uint32_t* static_context_map,
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96 const Command* commands, size_t n_commands, MetaBlockSplit* mb);
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97
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98 BROTLI_INTERNAL void BrotliOptimizeHistograms(uint32_t num_distance_codes,
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99 MetaBlockSplit* mb);
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100
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101 BROTLI_INTERNAL void BrotliInitDistanceParams(BrotliDistanceParams* params,
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102 uint32_t npostfix, uint32_t ndirect, BROTLI_BOOL large_window);
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103
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104 #if defined(__cplusplus) || defined(c_plusplus)
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105 } /* extern "C" */
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106 #endif
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107
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108 #endif /* BROTLI_ENC_METABLOCK_H_ */