1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/media/libjpeg/simd/jdct.inc Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,28 @@
1.4 +;
1.5 +; jdct.inc - private declarations for forward & reverse DCT subsystems
1.6 +;
1.7 +; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
1.8 +;
1.9 +; Based on
1.10 +; x86 SIMD extension for IJG JPEG library
1.11 +; Copyright (C) 1999-2006, MIYASAKA Masaru.
1.12 +; For conditions of distribution and use, see copyright notice in jsimdext.inc
1.13 +;
1.14 +; [TAB8]
1.15 +
1.16 +; Each IDCT routine is responsible for range-limiting its results and
1.17 +; converting them to unsigned form (0..MAXJSAMPLE). The raw outputs could
1.18 +; be quite far out of range if the input data is corrupt, so a bulletproof
1.19 +; range-limiting step is required. We use a mask-and-table-lookup method
1.20 +; to do the combined operations quickly.
1.21 +;
1.22 +%define RANGE_MASK (MAXJSAMPLE * 4 + 3) ; 2 bits wider than legal samples
1.23 +
1.24 +%define ROW(n,b,s) ((b)+(n)*(s))
1.25 +%define COL(n,b,s) ((b)+(n)*(s)*DCTSIZE)
1.26 +
1.27 +%define DWBLOCK(m,n,b,s) ((b)+(m)*DCTSIZE*(s)+(n)*SIZEOF_DWORD)
1.28 +%define MMBLOCK(m,n,b,s) ((b)+(m)*DCTSIZE*(s)+(n)*SIZEOF_MMWORD)
1.29 +%define XMMBLOCK(m,n,b,s) ((b)+(m)*DCTSIZE*(s)+(n)*SIZEOF_XMMWORD)
1.30 +
1.31 +; --------------------------------------------------------------------------
