diff options
Diffstat (limited to 'tags/1.2.1/simd/jdct.inc')
| -rw-r--r-- | tags/1.2.1/simd/jdct.inc | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/tags/1.2.1/simd/jdct.inc b/tags/1.2.1/simd/jdct.inc new file mode 100644 index 0000000..cc62704 --- /dev/null +++ b/tags/1.2.1/simd/jdct.inc @@ -0,0 +1,28 @@ +; +; 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) + +; -------------------------------------------------------------------------- |