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comparison: media/libjpeg/simd/jdct.inc
media/libjpeg/simd/jdct.inc
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:e0144641b77e |
|---|---|
| 1 ; | |
| 2 ; jdct.inc - private declarations for forward & reverse DCT subsystems | |
| 3 ; | |
| 4 ; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB | |
| 5 ; | |
| 6 ; Based on | |
| 7 ; x86 SIMD extension for IJG JPEG library | |
| 8 ; Copyright (C) 1999-2006, MIYASAKA Masaru. | |
| 9 ; For conditions of distribution and use, see copyright notice in jsimdext.inc | |
| 10 ; | |
| 11 ; [TAB8] | |
| 12 | |
| 13 ; Each IDCT routine is responsible for range-limiting its results and | |
| 14 ; converting them to unsigned form (0..MAXJSAMPLE). The raw outputs could | |
| 15 ; be quite far out of range if the input data is corrupt, so a bulletproof | |
| 16 ; range-limiting step is required. We use a mask-and-table-lookup method | |
| 17 ; to do the combined operations quickly. | |
| 18 ; | |
| 19 %define RANGE_MASK (MAXJSAMPLE * 4 + 3) ; 2 bits wider than legal samples | |
| 20 | |
| 21 %define ROW(n,b,s) ((b)+(n)*(s)) | |
| 22 %define COL(n,b,s) ((b)+(n)*(s)*DCTSIZE) | |
| 23 | |
| 24 %define DWBLOCK(m,n,b,s) ((b)+(m)*DCTSIZE*(s)+(n)*SIZEOF_DWORD) | |
| 25 %define MMBLOCK(m,n,b,s) ((b)+(m)*DCTSIZE*(s)+(n)*SIZEOF_MMWORD) | |
| 26 %define XMMBLOCK(m,n,b,s) ((b)+(m)*DCTSIZE*(s)+(n)*SIZEOF_XMMWORD) | |
| 27 | |
| 28 ; -------------------------------------------------------------------------- |
