Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/brotli/c/enc/fast_log.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 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 /* Utilities for fast computation of logarithms. */
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9 #ifndef BROTLI_ENC_FAST_LOG_H_
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10 #define BROTLI_ENC_FAST_LOG_H_
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12 #include <math.h>
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14 #include <brotli/types.h>
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16 #include "../common/platform.h"
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18 #if defined(__cplusplus) || defined(c_plusplus)
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19 extern "C" {
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20 #endif
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22 static BROTLI_INLINE uint32_t Log2FloorNonZero(size_t n) {
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23 #if defined(BROTLI_BSR32)
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24 return BROTLI_BSR32((uint32_t)n);
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25 #else
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26 uint32_t result = 0;
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27 while (n >>= 1) result++;
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28 return result;
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29 #endif
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30 }
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32 #define BROTLI_LOG2_TABLE_SIZE 256
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34 /* A lookup table for small values of log2(int) to be used in entropy
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35 computation. */
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36 BROTLI_INTERNAL extern const double kBrotliLog2Table[BROTLI_LOG2_TABLE_SIZE];
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38 /* Visual Studio 2012 and Android API levels < 18 do not have the log2()
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39 * function defined, so we use log() and a multiplication instead. */
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40 #if !defined(BROTLI_HAVE_LOG2)
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41 #if ((defined(_MSC_VER) && _MSC_VER <= 1700) || \
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42 (defined(__ANDROID_API__) && __ANDROID_API__ < 18))
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43 #define BROTLI_HAVE_LOG2 0
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44 #else
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45 #define BROTLI_HAVE_LOG2 1
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46 #endif
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47 #endif
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49 #define LOG_2_INV 1.4426950408889634
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51 /* Faster logarithm for small integers, with the property of log2(0) == 0. */
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52 static BROTLI_INLINE double FastLog2(size_t v) {
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53 if (v < BROTLI_LOG2_TABLE_SIZE) {
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54 return kBrotliLog2Table[v];
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55 }
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56 #if !(BROTLI_HAVE_LOG2)
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57 return log((double)v) * LOG_2_INV;
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58 #else
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59 return log2((double)v);
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60 #endif
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61 }
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63 #if defined(__cplusplus) || defined(c_plusplus)
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64 } /* extern "C" */
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65 #endif
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67 #endif /* BROTLI_ENC_FAST_LOG_H_ */