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29 lines
1.1 KiB
PHP
29 lines
1.1 KiB
PHP
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; jdct.inc - private declarations for forward & reverse DCT subsystems
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;
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; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
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;
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; Based on
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; x86 SIMD extension for IJG JPEG library
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; Copyright (C) 1999-2006, MIYASAKA Masaru.
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; For conditions of distribution and use, see copyright notice in jsimdext.inc
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;
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; [TAB8]
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; Each IDCT routine is responsible for range-limiting its results and
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; converting them to unsigned form (0..MAXJSAMPLE). The raw outputs could
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; be quite far out of range if the input data is corrupt, so a bulletproof
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; range-limiting step is required. We use a mask-and-table-lookup method
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; to do the combined operations quickly.
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;
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%define RANGE_MASK (MAXJSAMPLE * 4 + 3) ; 2 bits wider than legal samples
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%define ROW(n,b,s) ((b)+(n)*(s))
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%define COL(n,b,s) ((b)+(n)*(s)*DCTSIZE)
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%define DWBLOCK(m,n,b,s) ((b)+(m)*DCTSIZE*(s)+(n)*SIZEOF_DWORD)
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%define MMBLOCK(m,n,b,s) ((b)+(m)*DCTSIZE*(s)+(n)*SIZEOF_MMWORD)
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%define XMMBLOCK(m,n,b,s) ((b)+(m)*DCTSIZE*(s)+(n)*SIZEOF_XMMWORD)
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; --------------------------------------------------------------------------
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