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 ;

 ; jdct.inc - private declarations for forward & reverse DCT subsystems

 ;

 ; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB

 ;

 ; Based on

 ; x86 SIMD extension for IJG JPEG library

 ; Copyright (C) 1999-2006, MIYASAKA Masaru.

 ; For conditions of distribution and use, see copyright notice in jsimdext.inc

 ;

 ; [TAB8]

 ; Each IDCT routine is responsible for range-limiting its results and

 ; converting them to unsigned form (0..MAXJSAMPLE).  The raw outputs could

 ; be quite far out of range if the input data is corrupt, so a bulletproof

 ; range-limiting step is required.  We use a mask-and-table-lookup method

 ; to do the combined operations quickly.

 ;

 %define RANGE_MASK  (MAXJSAMPLE * 4 + 3)  ; 2 bits wider than legal samples

 %define ROW(n,b,s)		((b)+(n)*(s))

 %define COL(n,b,s)		((b)+(n)*(s)*DCTSIZE)

 %define DWBLOCK(m,n,b,s)	((b)+(m)*DCTSIZE*(s)+(n)*SIZEOF_DWORD)

 %define MMBLOCK(m,n,b,s)	((b)+(m)*DCTSIZE*(s)+(n)*SIZEOF_MMWORD)

 %define XMMBLOCK(m,n,b,s)	((b)+(m)*DCTSIZE*(s)+(n)*SIZEOF_XMMWORD)

 ; --------------------------------------------------------------------------