Index: third_party/libjpeg_turbo/simd/jdct.inc |
=================================================================== |
--- third_party/libjpeg_turbo/simd/jdct.inc (revision 0) |
+++ third_party/libjpeg_turbo/simd/jdct.inc (revision 0) |
@@ -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) |
+ |
+; -------------------------------------------------------------------------- |