ryan/mozjpeg
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Add note regarding the fact that 4:4:0 lacks full SIMD support; Add an option for benchmarking 4:4:0 subsampling in tjbench.

Browse Source 
git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/branches/1.3.x@1008 632fc199-4ca6-4c93-a231-07263d6284db
This commit is contained in:
DRC
2013-08-18 09:13:00 +00:00
parent bcda6834d6
commit 07796da4e5
2 changed files with 7 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
tjbench.c
View File

@@ -1,5 +1,5 @@
/*
* Copyright (C)2009-2012 D. R. Commander. All Rights Reserved.
* Copyright (C)2009-2013 D. R. Commander. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
@@ -686,6 +686,7 @@ void usage(char *progname)
printf(" codec\n");
printf("-accuratedct = Use the most accurate DCT/IDCT algorithms available in the\n");
printf(" underlying codec\n");
printf("-440 = Test 4:4:0 chrominance subsampling instead of 4:2:2\n");
printf("-quiet = Output results in tabular rather than verbose format\n");
printf("-yuvencode = Encode RGB input as planar YUV rather than compressing as JPEG\n");
printf("-yuvdecode = Decode JPEG image to planar YUV rather than RGB\n");
@@ -719,7 +720,7 @@ int main(int argc, char *argv[])
{
unsigned char *srcbuf=NULL; int w, h, i, j;
int minqual=-1, maxqual=-1; char *temp;
int minarg=2; int retval=0;
int minarg=2, retval=0, do440=0;
if((scalingfactors=tjGetScalingFactors(&nsf))==NULL || nsf==0)
_throwtj("executing tjGetScalingFactors()");
@@ -810,6 +811,7 @@ int main(int argc, char *argv[])
printf("Using most accurate DCT/IDCT algorithm\n\n");
flags|=TJFLAG_ACCURATEDCT;
}
if(!strcmp(argv[i], "-440")) do440=1;
if(!strcasecmp(argv[i], "-rgb")) pf=TJPF_RGB;
if(!strcasecmp(argv[i], "-rgbx")) pf=TJPF_RGBX;
if(!strcasecmp(argv[i], "-bgr")) pf=TJPF_BGR;
@@ -902,7 +904,7 @@ int main(int argc, char *argv[])
dotest(srcbuf, w, h, TJ_420, i, argv[1]);
printf("\n");
for(i=maxqual; i>=minqual; i--)
dotest(srcbuf, w, h, TJ_422, i, argv[1]);
dotest(srcbuf, w, h, do440? TJSAMP_440:TJ_422, i, argv[1]);
printf("\n");
for(i=maxqual; i>=minqual; i--)
dotest(srcbuf, w, h, TJ_444, i, argv[1]);

2
turbojpeg.h
View File

@@ -85,6 +85,8 @@ enum TJSAMP
/**
* 4:4:0 chrominance subsampling. The JPEG or YUV image will contain one
* chrominance component for every 1x2 block of pixels in the source image.
* Note that 4:4:0 subsampling is not fully accelerated in the libjpeg-turbo
* implementation of TurboJPEG.
*/
TJSAMP_440
};