kc3-lang/libjpeg-turbo/jchuff.h

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• Hash : bd49803f
  Author :
  Date : 2016-02-19T08:53:33
  

  Use consistent/modern code formatting for pointers
  
  The convention used by libjpeg:
  
      type * variable;
  
  is not very common anymore, because it looks too much like
  multiplication.  Some (particularly C++ programmers) prefer to tuck the
  pointer symbol against the type:
  
      type* variable;
  
  to emphasize that a pointer to a type is effectively a new type.
  However, this can also be confusing, since defining multiple variables
  on the same line would not work properly:
  
      type* variable1, variable2;  /* Only variable1 is actually a
                                      pointer. */
  
  This commit reformats the entirety of the libjpeg-turbo code base so
  that it uses the same code formatting convention for pointers that the
  TurboJPEG API code uses:
  
      type *variable1, *variable2;
  
  This seems to be the most common convention among C programmers, and
  it is the convention used by other codec libraries, such as libpng and
  libtiff.
  

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• jchuff.h

• /*
   * jchuff.h
   *
   * This file was part of the Independent JPEG Group's software:
   * Copyright (C) 1991-1997, Thomas G. Lane.
   * It was modified by The libjpeg-turbo Project to include only code relevant
   * to libjpeg-turbo.
   * For conditions of distribution and use, see the accompanying README.ijg
   * file.
   *
   * This file contains declarations for Huffman entropy encoding routines
   * that are shared between the sequential encoder (jchuff.c) and the
   * progressive encoder (jcphuff.c).  No other modules need to see these.
   */
  
  /* The legal range of a DCT coefficient is
   *  -1024 .. +1023  for 8-bit data;
   * -16384 .. +16383 for 12-bit data.
   * Hence the magnitude should always fit in 10 or 14 bits respectively.
   */
  
  #if BITS_IN_JSAMPLE == 8
  #define MAX_COEF_BITS 10
  #else
  #define MAX_COEF_BITS 14
  #endif
  
  /* Derived data constructed for each Huffman table */
  
  typedef struct {
    unsigned int ehufco[256];     /* code for each symbol */
    char ehufsi[256];             /* length of code for each symbol */
    /* If no code has been allocated for a symbol S, ehufsi[S] contains 0 */
  } c_derived_tbl;
  
  /* Expand a Huffman table definition into the derived format */
  EXTERN(void) jpeg_make_c_derived_tbl
          (j_compress_ptr cinfo, boolean isDC, int tblno,
           c_derived_tbl ** pdtbl);
  
  /* Generate an optimal table definition given the specified counts */
  EXTERN(void) jpeg_gen_optimal_table
          (j_compress_ptr cinfo, JHUFF_TBL *htbl, long freq[]);
  

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