kc3-lang/libjpeg-turbo/simd/nasm/jsimdcfg.inc

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• Hash : bfc3ce31
  Author :
  Date : 2018-04-10T15:50:22
  

  x86[-64] SIMD: Don't auto-generate jsimdcfg.inc
  
  The old Un*x (autotools-based) build system always auto-generated this
  file, but that behavior was more or less a relic of the days before the
  libjpeg-turbo colorspace extensions were implemented.  The thinking was
  that, if a particular developer wanted to change RGB_RED, RGB_GREEN,
  RGB_BLUE, or RGB_PIXELSIZE in order to compress from/decompress to
  different RGB pixel layouts, then the SIMD extensions should
  automatically respond to those changes whenever they were made to
  jmorecfg.h.  The modern reality is that changing RGB_* is no longer
  necessary because of the libjpeg-turbo colorspace extensions, and
  changing any of the other constants in jsimdcfg.inc can't be done
  without making deeper modifications to the SIMD extensions.  In general,
  we treat RGB_* as a de facto, immutable part of the legacy libpjeg API.
  Realistically, since the values of those constants have been the same in
  every Un*x distribution released in the past 20-30 years, any software
  that uses a system-supplied build of libjpeg must assume that those
  constants will have default values.
  
  Furthermore, even if it made sense to auto-generate jsimdcfg.inc, it was
  never possible to do so on Windows, so it was always going to be
  necessary to manually generate the Windows version of the file whenever
  any of the constants changed.  This commit introduces a new custom CMake
  target called "jsimdcfg" that can be used, on Un*x platforms, to
  generate jsimdcfg.inc on demand, although this should only be necessary
  when introducing new x86 SIMD instructions or making other deep
  modifications, such as SIMD acceleration for 12-bit JPEGs.
  
  For those who may be wondering why we don't do the same thing for
  win/jconfig.h.in, it's because performing all of the necessary CMake
  checks to populate that file is very slow on Windows.
  

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• simd/nasm/jsimdcfg.inc

• ;
  ; Automatically generated include file from jsimdcfg.inc.h
  ;
  ;
  ; -- jpeglib.h
  ;
  %define DCTSIZE 8
  %define DCTSIZE2 64
  ;
  ; -- jmorecfg.h
  ;
  %define RGB_RED 0
  %define RGB_GREEN 1
  %define RGB_BLUE 2
  %define RGB_PIXELSIZE 3
  %define EXT_RGB_RED 0
  %define EXT_RGB_GREEN 1
  %define EXT_RGB_BLUE 2
  %define EXT_RGB_PIXELSIZE 3
  %define EXT_RGBX_RED 0
  %define EXT_RGBX_GREEN 1
  %define EXT_RGBX_BLUE 2
  %define EXT_RGBX_PIXELSIZE 4
  %define EXT_BGR_RED 2
  %define EXT_BGR_GREEN 1
  %define EXT_BGR_BLUE 0
  %define EXT_BGR_PIXELSIZE 3
  %define EXT_BGRX_RED 2
  %define EXT_BGRX_GREEN 1
  %define EXT_BGRX_BLUE 0
  %define EXT_BGRX_PIXELSIZE 4
  %define EXT_XBGR_RED 3
  %define EXT_XBGR_GREEN 2
  %define EXT_XBGR_BLUE 1
  %define EXT_XBGR_PIXELSIZE 4
  %define EXT_XRGB_RED 1
  %define EXT_XRGB_GREEN 2
  %define EXT_XRGB_BLUE 3
  %define EXT_XRGB_PIXELSIZE 4
  %define RGBX_FILLER_0XFF 1
  ; Representation of a single sample (pixel element value).
  ; On this SIMD implementation, this must be 'unsigned char'.
  ;
  %define JSAMPLE byte ; unsigned char
  %define SIZEOF_JSAMPLE SIZEOF_BYTE ; sizeof(JSAMPLE)
  %define CENTERJSAMPLE 128
  ; Representation of a DCT frequency coefficient.
  ; On this SIMD implementation, this must be 'short'.
  ;
  %define JCOEF word ; short
  %define SIZEOF_JCOEF SIZEOF_WORD ; sizeof(JCOEF)
  ; Datatype used for image dimensions.
  ; On this SIMD implementation, this must be 'unsigned int'.
  ;
  %define JDIMENSION dword ; unsigned int
  %define SIZEOF_JDIMENSION SIZEOF_DWORD ; sizeof(JDIMENSION)
  %define JSAMPROW POINTER ; JSAMPLE * (jpeglib.h)
  %define JSAMPARRAY POINTER ; JSAMPROW * (jpeglib.h)
  %define JSAMPIMAGE POINTER ; JSAMPARRAY * (jpeglib.h)
  %define JCOEFPTR POINTER ; JCOEF * (jpeglib.h)
  %define SIZEOF_JSAMPROW SIZEOF_POINTER ; sizeof(JSAMPROW)
  %define SIZEOF_JSAMPARRAY SIZEOF_POINTER ; sizeof(JSAMPARRAY)
  %define SIZEOF_JSAMPIMAGE SIZEOF_POINTER ; sizeof(JSAMPIMAGE)
  %define SIZEOF_JCOEFPTR SIZEOF_POINTER ; sizeof(JCOEFPTR)
  ;
  ; -- jdct.h
  ;
  ; A forward DCT routine is given a pointer to a work area of type DCTELEM[];
  ; the DCT is to be performed in-place in that buffer.
  ; To maximize parallelism, Type DCTELEM is changed to short (originally, int).
  ;
  %define DCTELEM word ; short
  %define SIZEOF_DCTELEM SIZEOF_WORD ; sizeof(DCTELEM)
  %define float FP32 ; float
  %define SIZEOF_FAST_FLOAT SIZEOF_FP32 ; sizeof(float)
  ; To maximize parallelism, Type short is changed to short.
  ;
  %define ISLOW_MULT_TYPE word ; must be short
  %define SIZEOF_ISLOW_MULT_TYPE SIZEOF_WORD ; sizeof(ISLOW_MULT_TYPE)
  %define IFAST_MULT_TYPE word ; must be short
  %define SIZEOF_IFAST_MULT_TYPE SIZEOF_WORD ; sizeof(IFAST_MULT_TYPE)
  %define IFAST_SCALE_BITS 2 ; fractional bits in scale factors
  %define FLOAT_MULT_TYPE FP32 ; must be float
  %define SIZEOF_FLOAT_MULT_TYPE SIZEOF_FP32 ; sizeof(FLOAT_MULT_TYPE)
  ;
  ; -- jsimd.h
  ;
  %define JSIMD_NONE 0x00
  %define JSIMD_MMX 0x01
  %define JSIMD_3DNOW 0x02
  %define JSIMD_SSE 0x04
  %define JSIMD_SSE2 0x08
  %define JSIMD_AVX2 0x80
  

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