kc3-lang/libjpeg-turbo/jconfigint.h.in

• Show log

  Commit

• Hash : fa2b6ea0
  Author :
  Date : 2024-01-12T18:21:41
  

  Eliminate duplicate copies of jpeg_nbits_table
  
  ef9a4e05ba919494cbebe50e15f332de5ab97e82 (libjpeg-turbo 1.4.x), which
  was based on
  https://bug815473.bmoattachments.org/attachment.cgi?id=692126
  (https://bugzilla.mozilla.org/show_bug.cgi?id=815473), modified the C
  baseline Huffman encoder so that it precomputes jpeg_nbits_table, in
  order to facilitate sharing the table among multiple processes.
  However, libjpeg-turbo never shared the table, and because the table was
  implemented as a static array, f3a8684cd1c28e557d394470962a7a224c76ddbc
  (libjpeg-turbo 1.5.x) and 37bae1a0e977ee1ba769e6f0aa27e519ab6e58c6
  (libjpeg-turbo 2.0.x) each introduced a duplicate copy of the table for
  (respectively) the SSE2 baseline Huffman encoder and the C progressive
  Huffman encoder.
  
  This commit does the following:
  - Move the duplicated code in jchuff.c and jcphuff.c, originally
    introduced in 0cfc4c17b740cb2cbb11f9d85c8ab3745d5b913a and
    37bae1a0e977ee1ba769e6f0aa27e519ab6e58c6, into a header
    (jpeg_nbits.h).
  - Credit the co-author of 0cfc4c17b740cb2cbb11f9d85c8ab3745d5b913a.
    (Refer to https://sourceforge.net/p/libjpeg-turbo/patches/57).
  - Modify the SSE2 baseline Huffman encoder so that the C Huffman
    encoders can share its definition of jpeg_nbits_table.
  - Move the definition of jpeg_nbits_table into a C source file
    (jpeg_nbits.c) rather than a header, and define the table only if
    USE_CLZ_INTRINSIC is undefined and the SSE2 baseline Huffman encoder
    will not be built.
  - Apply hidden symbol visibility to the shared definition of
    jpeg_nbits_table, if the compiler supports the necessary attribute.
    (In practice, only Visual C++ doesn't.)
  
  Closes #114
  
  See also:
  https://bugzilla.mozilla.org/show_bug.cgi?id=1501523
  

Download

• jconfigint.h.in

• /* libjpeg-turbo build number */
  #define BUILD  "@BUILD@"
  
  /* How to hide global symbols. */
  #define HIDDEN  @HIDDEN@
  
  /* Compiler's inline keyword */
  #undef inline
  
  /* How to obtain function inlining. */
  #define INLINE  @INLINE@
  
  /* How to obtain thread-local storage */
  #define THREAD_LOCAL  @THREAD_LOCAL@
  
  /* Define to the full name of this package. */
  #define PACKAGE_NAME  "@CMAKE_PROJECT_NAME@"
  
  /* Version number of package */
  #define VERSION  "@VERSION@"
  
  /* The size of `size_t', as computed by sizeof. */
  #define SIZEOF_SIZE_T  @SIZE_T@
  
  /* Define if your compiler has __builtin_ctzl() and sizeof(unsigned long) == sizeof(size_t). */
  #cmakedefine HAVE_BUILTIN_CTZL
  
  /* Define to 1 if you have the <intrin.h> header file. */
  #cmakedefine HAVE_INTRIN_H
  
  #if defined(_MSC_VER) && defined(HAVE_INTRIN_H)
  #if (SIZEOF_SIZE_T == 8)
  #define HAVE_BITSCANFORWARD64
  #elif (SIZEOF_SIZE_T == 4)
  #define HAVE_BITSCANFORWARD
  #endif
  #endif
  
  #if defined(__has_attribute)
  #if __has_attribute(fallthrough)
  #define FALLTHROUGH  __attribute__((fallthrough));
  #else
  #define FALLTHROUGH
  #endif
  #else
  #define FALLTHROUGH
  #endif
  
  /*
   * Define BITS_IN_JSAMPLE as either
   *   8   for 8-bit sample values (the usual setting)
   *   12  for 12-bit sample values
   * Only 8 and 12 are legal data precisions for lossy JPEG according to the
   * JPEG standard, and the IJG code does not support anything else!
   */
  
  #ifndef BITS_IN_JSAMPLE
  #define BITS_IN_JSAMPLE  8      /* use 8 or 12 */
  #endif
  
  #undef C_ARITH_CODING_SUPPORTED
  #undef D_ARITH_CODING_SUPPORTED
  #undef WITH_SIMD
  
  #if BITS_IN_JSAMPLE == 8
  
  /* Support arithmetic encoding */
  #cmakedefine C_ARITH_CODING_SUPPORTED 1
  
  /* Support arithmetic decoding */
  #cmakedefine D_ARITH_CODING_SUPPORTED 1
  
  /* Use accelerated SIMD routines. */
  #cmakedefine WITH_SIMD 1
  
  #endif
  

Download