Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/brotli/c/enc/cluster.c @ 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
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1 /* Copyright 2013 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 /* Functions for clustering similar histograms together. */
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9 #include "cluster.h"
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11 #include <brotli/types.h>
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13 #include "../common/platform.h"
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14 #include "bit_cost.h" /* BrotliPopulationCost */
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15 #include "fast_log.h"
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16 #include "histogram.h"
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17 #include "memory.h"
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19 #if defined(__cplusplus) || defined(c_plusplus)
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20 extern "C" {
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21 #endif
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23 static BROTLI_INLINE BROTLI_BOOL HistogramPairIsLess(
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24 const HistogramPair* p1, const HistogramPair* p2) {
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25 if (p1->cost_diff != p2->cost_diff) {
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26 return TO_BROTLI_BOOL(p1->cost_diff > p2->cost_diff);
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27 }
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28 return TO_BROTLI_BOOL((p1->idx2 - p1->idx1) > (p2->idx2 - p2->idx1));
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29 }
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31 /* Returns entropy reduction of the context map when we combine two clusters. */
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32 static BROTLI_INLINE double ClusterCostDiff(size_t size_a, size_t size_b) {
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33 size_t size_c = size_a + size_b;
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34 return (double)size_a * FastLog2(size_a) +
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35 (double)size_b * FastLog2(size_b) -
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36 (double)size_c * FastLog2(size_c);
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37 }
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39 #define CODE(X) X
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41 #define FN(X) X ## Literal
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42 #include "cluster_inc.h" /* NOLINT(build/include) */
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43 #undef FN
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45 #define FN(X) X ## Command
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46 #include "cluster_inc.h" /* NOLINT(build/include) */
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47 #undef FN
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49 #define FN(X) X ## Distance
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50 #include "cluster_inc.h" /* NOLINT(build/include) */
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51 #undef FN
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53 #undef CODE
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55 #if defined(__cplusplus) || defined(c_plusplus)
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56 } /* extern "C" */
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57 #endif