kc3-lang/libjpeg-turbo/simd/powerpc/jccolor-altivec.c

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• Hash : 19c791cd
  Author :
  Date : 2018-03-08T10:55:20
  

  Improve code formatting consistency
  
  With rare exceptions ...
  - Always separate line continuation characters by one space from
    preceding code.
  - Always use two-space indentation.  Never use tabs.
  - Always use K&R-style conditional blocks.
  - Always surround operators with spaces, except in raw assembly code.
  - Always put a space after, but not before, a comma.
  - Never put a space between type casts and variables/function calls.
  - Never put a space between the function name and the argument list in
    function declarations and prototypes.
  - Always surround braces ('{' and '}') with spaces.
  - Always surround statements (if, for, else, catch, while, do, switch)
    with spaces.
  - Always attach pointer symbols ('*' and '**') to the variable or
    function name.
  - Always precede pointer symbols ('*' and '**') by a space in type
    casts.
  - Use the MIN() macro from jpegint.h within the libjpeg and TurboJPEG
    API libraries (using min() from tjutil.h is still necessary for
    TJBench.)
  - Where it makes sense (particularly in the TurboJPEG code), put a blank
    line after variable declaration blocks.
  - Always separate statements in one-liners by two spaces.
  
  The purpose of this was to ease maintenance on my part and also to make
  it easier for contributors to figure out how to format patch
  submissions.  This was admittedly confusing (even to me sometimes) when
  we had 3 or 4 different style conventions in the same source tree.  The
  new convention is more consistent with the formatting of other OSS code
  bases.
  
  This commit corrects deviations from the chosen formatting style in the
  libjpeg API code and reformats the TurboJPEG API code such that it
  conforms to the same standard.
  
  NOTES:
  - Although it is no longer necessary for the function name in function
    declarations to begin in Column 1 (this was historically necessary
    because of the ansi2knr utility, which allowed libjpeg to be built
    with non-ANSI compilers), we retain that formatting for the libjpeg
    code because it improves readability when using libjpeg's function
    attribute macros (GLOBAL(), etc.)
  - This reformatting project was accomplished with the help of AStyle and
    Uncrustify, although neither was completely up to the task, and thus
    a great deal of manual tweaking was required.  Note to developers of
    code formatting utilities:  the libjpeg-turbo code base is an
    excellent test bed, because AFAICT, it breaks every single one of the
    utilities that are currently available.
  - The legacy (MMX, SSE, 3DNow!) assembly code for i386 has been
    formatted to match the SSE2 code (refer to
    ff5685d5344273df321eb63a005eaae19d2496e3.)  I hadn't intended to
    bother with this, but the Loongson MMI implementation demonstrated
    that there is still academic value to the MMX implementation, as an
    algorithmic model for other 64-bit vector implementations.  Thus, it
    is desirable to improve its readability in the same manner as that of
    the SSE2 implementation.
  

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• simd/powerpc/jccolor-altivec.c

• /*
   * AltiVec optimizations for libjpeg-turbo
   *
   * Copyright (C) 2014, D. R. Commander.  All Rights Reserved.
   *
   * This software is provided 'as-is', without any express or implied
   * warranty.  In no event will the authors be held liable for any damages
   * arising from the use of this software.
   *
   * Permission is granted to anyone to use this software for any purpose,
   * including commercial applications, and to alter it and redistribute it
   * freely, subject to the following restrictions:
   *
   * 1. The origin of this software must not be misrepresented; you must not
   *    claim that you wrote the original software. If you use this software
   *    in a product, an acknowledgment in the product documentation would be
   *    appreciated but is not required.
   * 2. Altered source versions must be plainly marked as such, and must not be
   *    misrepresented as being the original software.
   * 3. This notice may not be removed or altered from any source distribution.
   */
  
  /* RGB --> YCC CONVERSION */
  
  #include "jsimd_altivec.h"
  
  
  #define F_0_081 5329                 /* FIX(0.08131) */
  #define F_0_114 7471                 /* FIX(0.11400) */
  #define F_0_168 11059                /* FIX(0.16874) */
  #define F_0_250 16384                /* FIX(0.25000) */
  #define F_0_299 19595                /* FIX(0.29900) */
  #define F_0_331 21709                /* FIX(0.33126) */
  #define F_0_418 27439                /* FIX(0.41869) */
  #define F_0_500 32768                /* FIX(0.50000) */
  #define F_0_587 38470                /* FIX(0.58700) */
  #define F_0_337 (F_0_587 - F_0_250)  /* FIX(0.58700) - FIX(0.25000) */
  
  #define SCALEBITS 16
  #define ONE_HALF (1 << (SCALEBITS - 1))
  
  
  #define RGBG_INDEX0 \
    {  0,  1,  3,  4,  6,  7,  9, 10,  2,  1,  5,  4,  8,  7, 11, 10 }
  #define RGBG_INDEX1 \
    { 12, 13, 15, 16, 18, 19, 21, 22, 14, 13, 17, 16, 20, 19, 23, 22 }
  #define RGBG_INDEX2 \
    {  8,  9, 11, 12, 14, 15, 17, 18, 10,  9, 13, 12, 16, 15, 19, 18 }
  #define RGBG_INDEX3 \
    {  4,  5,  7,  8, 10, 11, 13, 14,  6,  5,  9,  8, 12, 11, 15, 14 }
  #include "jccolext-altivec.c"
  #undef RGB_PIXELSIZE
  
  #define RGB_PIXELSIZE EXT_RGB_PIXELSIZE
  #define jsimd_rgb_ycc_convert_altivec jsimd_extrgb_ycc_convert_altivec
  #include "jccolext-altivec.c"
  #undef RGB_PIXELSIZE
  #undef RGBG_INDEX0
  #undef RGBG_INDEX1
  #undef RGBG_INDEX2
  #undef RGBG_INDEX3
  #undef jsimd_rgb_ycc_convert_altivec
  
  #define RGB_PIXELSIZE EXT_RGBX_PIXELSIZE
  #define RGBG_INDEX \
    {  0,  1,  4,  5,  8,  9, 12, 13,  2,  1,  6,  5, 10,  9, 14, 13 }
  #define jsimd_rgb_ycc_convert_altivec jsimd_extrgbx_ycc_convert_altivec
  #include "jccolext-altivec.c"
  #undef RGB_PIXELSIZE
  #undef RGBG_INDEX
  #undef jsimd_rgb_ycc_convert_altivec
  
  #define RGB_PIXELSIZE EXT_BGR_PIXELSIZE
  #define RGBG_INDEX0 \
    {  2,  1,  5,  4,  8,  7, 11, 10,  0,  1,  3,  4,  6,  7,  9, 10 }
  #define RGBG_INDEX1 \
    { 14, 13, 17, 16, 20, 19, 23, 22, 12, 13, 15, 16, 18, 19, 21, 22 }
  #define RGBG_INDEX2 \
    { 10,  9, 13, 12, 16, 15, 19, 18,  8,  9, 11, 12, 14, 15, 17, 18 }
  #define RGBG_INDEX3 \
    {  6,  5,  9,  8, 12, 11, 15, 14,  4,  5,  7,  8, 10, 11, 13, 14 }
  #define jsimd_rgb_ycc_convert_altivec jsimd_extbgr_ycc_convert_altivec
  #include "jccolext-altivec.c"
  #undef RGB_PIXELSIZE
  #undef RGBG_INDEX0
  #undef RGBG_INDEX1
  #undef RGBG_INDEX2
  #undef RGBG_INDEX3
  #undef jsimd_rgb_ycc_convert_altivec
  
  #define RGB_PIXELSIZE EXT_BGRX_PIXELSIZE
  #define RGBG_INDEX \
    {  2,  1,  6,  5, 10,  9, 14, 13,  0,  1,  4,  5,  8,  9, 12, 13 }
  #define jsimd_rgb_ycc_convert_altivec jsimd_extbgrx_ycc_convert_altivec
  #include "jccolext-altivec.c"
  #undef RGB_PIXELSIZE
  #undef RGBG_INDEX
  #undef jsimd_rgb_ycc_convert_altivec
  
  #define RGB_PIXELSIZE EXT_XBGR_PIXELSIZE
  #define RGBG_INDEX \
    {  3,  2,  7,  6, 11, 10, 15, 14,  1,  2,  5,  6,  9, 10, 13, 14 }
  #define jsimd_rgb_ycc_convert_altivec jsimd_extxbgr_ycc_convert_altivec
  #include "jccolext-altivec.c"
  #undef RGB_PIXELSIZE
  #undef RGBG_INDEX
  #undef jsimd_rgb_ycc_convert_altivec
  
  #define RGB_PIXELSIZE EXT_XRGB_PIXELSIZE
  #define RGBG_INDEX \
    {  1,  2,  5,  6,  9, 10, 13, 14,  3,  2,  7,  6, 11, 10, 15, 14 }
  #define jsimd_rgb_ycc_convert_altivec jsimd_extxrgb_ycc_convert_altivec
  #include "jccolext-altivec.c"
  #undef RGB_PIXELSIZE
  #undef RGBG_INDEX
  #undef jsimd_rgb_ycc_convert_altivec
  

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