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