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| author | DRC <dcommander@users.sourceforge.net> | 2014-05-11 10:09:07 +0000 |
|---|---|---|
| committer | DRC <dcommander@users.sourceforge.net> | 2014-05-11 10:09:07 +0000 |
| commit | 715bb41ead1afcd5f71ee0753f204f0d47048d0c (patch) | |
| tree | ea5ce4b4976a827b8b837f752b075dddaa68994a /Makefile.am | |
| parent | a7584601756048be06e874ef390ef5ba1ba4ca63 (diff) | |
| parent | 5829cb23983cd241c48abd8ed70ff3627560c453 (diff) | |
| download | libjpeg-turbo-715bb41ead1afcd5f71ee0753f204f0d47048d0c.tar.gz | |
Port the more accurate (and slightly faster) floating point IDCT implementation from jpeg-8a and later. New research revealed that the SSE/SSE2 floating point IDCT implementation was actually more accurate than the jpeg-6b implementation, not less, which is why its mathematical results have always differed from those of the jpeg-6b implementation. This patch brings the accuracy of the C code in line with that of the SSE/SSE2 code.
git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/trunk@1288 632fc199-4ca6-4c93-a231-07263d6284db
Diffstat (limited to 'Makefile.am')
| -rw-r--r-- | Makefile.am | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/Makefile.am b/Makefile.am index f14ddbf7..1844672d 100644 --- a/Makefile.am +++ b/Makefile.am @@ -175,15 +175,13 @@ MD5_JPEG_GRAY_ISLOW = 72b51f894b8f4a10b3ee3066770aa38d MD5_PPM_GRAY_ISLOW = 8d3596c56eace32f205deccc229aa5ed MD5_PPM_GRAY_RGB_ISLOW = 116424ac07b79e5e801f00508eab48ec MD5_JPEG_420S_IFAST_OPT = 388708217ac46273ca33086b22827ed8 -# The SSE/SSE2 DCT/IDCT implementation has always produced a slight round-off -# error relative to the C code, so in this case, we just test for regression -# rather than verifying that the output matches libjpeg. +# See README-turbo.txt for more details on why this next bit is necessary. if WITH_SSE_FLOAT_DCT MD5_JPEG_3x2_FLOAT_PROG = 343e3f8caf8af5986ebaf0bdc13b5c71 MD5_PPM_3x2_FLOAT = 1a75f36e5904d6fc3a85a43da9ad89bb else MD5_JPEG_3x2_FLOAT_PROG = 9bca803d2042bd1eb03819e2bf92b3e5 -MD5_PPM_3x2_FLOAT = ef6a420e369440edd6b918a0cf54ba3f +MD5_PPM_3x2_FLOAT = f6bfab038438ed8f5522fbd33595dcdc endif MD5_JPEG_420_ISLOW_ARI = e986fb0a637a8d833d96e8a6d6d84ea1 MD5_JPEG_444_ISLOW_PROGARI = 0a8f1c8f66e113c3cf635df0a475a617 |