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Merge the TurboJPEG planar YUV encoding feature from VirtualGL 2.2

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This commit is contained in:
DRC
2010-11-24 04:02:37 +00:00
parent c0cfde855c
commit 979a590374
7 changed files with 334 additions and 23 deletions
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2
CMakeLists.txt
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@@ -209,6 +209,7 @@ add_executable(wrjpgcom rdjpgcom.c)
enable_testing()
add_test(jpegut jpegut)
add_test(jpegut-yuv jpegut -yuv)
add_test(cjpeg-int sharedlib/cjpeg -dct int -outfile testoutint.jpg ${CMAKE_SOURCE_DIR}/testorig.ppm)
add_test(cjpeg-int-cmp ${CMAKE_COMMAND} -E compare_files ${CMAKE_SOURCE_DIR}/testimgint.jpg testoutint.jpg)
add_test(cjpeg-fast sharedlib/cjpeg -dct fast -opt -outfile testoutfst.jpg ${CMAKE_SOURCE_DIR}/testorig.ppm)
@@ -251,6 +252,7 @@ add_test(jpegtran-crop sharedlib/jpegtran -crop 120x90+20+50 -transpose -perfect
add_test(jpegtran-crop-cmp ${CMAKE_COMMAND} -E compare_files ${CMAKE_SOURCE_DIR}/testimgcrop.jpg testoutcrop.jpg)
add_test(jpegut-static jpegut-static)
add_test(jpegut-static-yuv jpegut-static -yuv)
add_test(cjpeg-static-int cjpeg-static -dct int -outfile testoutint.jpg ${CMAKE_SOURCE_DIR}/testorig.ppm)
add_test(cjpeg-static-int-cmp ${CMAKE_COMMAND} -E compare_files ${CMAKE_SOURCE_DIR}/testimgint.jpg testoutint.jpg)
add_test(cjpeg-static-fast cjpeg-static -dct fast -opt -outfile testoutfst.jpg ${CMAKE_SOURCE_DIR}/testorig.ppm)

3
ChangeLog.txt
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@@ -21,6 +21,9 @@ when the library is built with libjpeg v6b emulation.
[7] Added arithmetic encoding and decoding support (can be disabled via
configure or CMake options)
[8] TurboJPEG/OSS can now leverage the SIMD-accelerated color conversion
routines in libjpeg-turbo to generate planar YUV images from RGB input.
Significant changes since 1.0.0
===============================

1
Makefile.am
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@@ -124,6 +124,7 @@ dist-hook:
test: testclean all
./jpegut
./jpegut -yuv
./cjpeg -dct int -outfile testoutint.jpg $(srcdir)/testorig.ppm
cmp $(srcdir)/testimgint.jpg testoutint.jpg
./cjpeg -dct fast -opt -outfile testoutfst.jpg $(srcdir)/testorig.ppm

165
jpegut.c
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@@ -1,6 +1,6 @@
/* Copyright (C)2004 Landmark Graphics Corporation
* Copyright (C)2005 Sun Microsystems, Inc.
* Copyright (C)2009 D. R. Commander
* Copyright (C)2009-2010 D. R. Commander
*
* This library is free software and may be redistributed and/or modified under
* the terms of the wxWindows Library License, Version 3.1 or (at your option)
@@ -18,11 +18,18 @@
#include <string.h>
#include "./rrtimer.h"
#include "./turbojpeg.h"
#ifndef _WIN32
#define stricmp strcasecmp
#endif
#define _catch(f) {if((f)==-1) {printf("TJPEG: %s\n", tjGetErrorStr()); bailout();}}
const char *_subnamel[NUMSUBOPT]={"4:4:4", "4:2:2", "4:2:0", "GRAY"};
const char *_subnames[NUMSUBOPT]={"444", "422", "420", "GRAY"};
const int _hsf[NUMSUBOPT]={1, 2, 2, 1};
const int _vsf[NUMSUBOPT]={1, 1, 2, 1};
int yuv=0;
int exitstatus=0;
#define bailout() {exitstatus=-1; goto finally;}
@@ -197,6 +204,126 @@ int checkbuf(unsigned char *buf, int w, int h, int ps, int subsamp, int flags)
return 1;
}
#define checkval(v, cv) { \
if(v<cv-1 || v>cv+1) { \
printf("\nComp. %s at %d,%d should be %d, not %d\n", #v, i, j, cv, v); \
retval=0; goto bailout; \
}}
#define checkval0(v) { \
if(v>1) { \
printf("\nComp. %s at %d,%d should be 0, not %d\n", #v, i, j, v); \
retval=0; goto bailout; \
}}
#define checkval255(v) { \
if(v<254 && !(v==217 && i==0 && j==21)) { \
printf("\nComp. %s at %d,%d should be 255, not %d\n", #v, i, j, v); \
retval=0; goto bailout; \
}}
#define PAD(v, p) ((v+(p)-1)&(~((p)-1)))
int checkbufyuv(unsigned char *buf, unsigned long size, int w, int h,
int subsamp)
{
int i, j;
int hsf=_hsf[subsamp], vsf=_vsf[subsamp];
int pw=PAD(w, hsf), ph=PAD(h, vsf);
int cw=pw/hsf, ch=ph/vsf;
int ypitch=PAD(pw, 4), uvpitch=PAD(cw, 4);
int retval=1;
unsigned long correctsize=ypitch*ph + (subsamp==TJ_GRAYSCALE? 0:uvpitch*ch*2);
if(size!=correctsize)
{
printf("\nIncorrect size %lu. Should be %lu\n", size, correctsize);
retval=0; goto bailout;
}
for(i=0; i<16; i++)
{
for(j=0; j<pw; j++)
{
unsigned char y=buf[ypitch*i+j];
if(((i/8)+(j/8))%2==0) checkval255(y)
else checkval(y, 76)
}
}
for(i=16; i<ph; i++)
{
for(j=0; j<pw; j++)
{
unsigned char y=buf[ypitch*i+j];
if(((i/8)+(j/8))%2==0) checkval0(y)
else checkval(y, 226)
}
}
if(subsamp!=TJ_GRAYSCALE)
{
for(i=0; i<16/vsf; i++)
{
for(j=0; j<cw; j++)
{
unsigned char u=buf[ypitch*ph + (uvpitch*i+j)],
v=buf[ypitch*ph + uvpitch*ch + (uvpitch*i+j)];
if(((i*vsf/8)+(j*hsf/8))%2==0)
{
checkval(u, 128); checkval(v, 128);
}
else
{
checkval(u, 85); checkval255(v);
}
}
}
for(i=16/vsf; i<ch; i++)
{
for(j=0; j<cw; j++)
{
unsigned char u=buf[ypitch*ph + (uvpitch*i+j)],
v=buf[ypitch*ph + uvpitch*ch + (uvpitch*i+j)];
if(((i*vsf/8)+(j*hsf/8))%2==0)
{
checkval(u, 128); checkval(v, 128);
}
else
{
checkval0(u); checkval(v, 149);
}
}
}
}
bailout:
if(retval==0)
{
for(i=0; i<ph; i++)
{
for(j=0; j<pw; j++)
printf("%.3d ", buf[ypitch*i+j]);
printf("\n");
}
printf("\n");
for(i=0; i<ch; i++)
{
for(j=0; j<cw; j++)
printf("%.3d ", buf[ypitch*ph + (uvpitch*i+j)]);
printf("\n");
}
printf("\n");
for(i=0; i<ch; i++)
{
for(j=0; j<cw; j++)
printf("%.3d ", buf[ypitch*ph + uvpitch*ch + (uvpitch*i+j)]);
printf("\n");
}
printf("\n");
}
return retval;
}
void writejpeg(unsigned char *jpegbuf, unsigned long jpgbufsize, char *filename)
{
FILE *outfile=NULL;
@@ -221,6 +348,8 @@ void gentestjpeg(tjhandle hnd, unsigned char *jpegbuf, unsigned long *size,
char tempstr[1024]; unsigned char *bmpbuf=NULL;
const char *pixformat; double t;
if(yuv) flags|=TJ_YUV;
if(flags&TJ_BGR)
{
if(ps==3) pixformat="BGR";
@@ -232,8 +361,12 @@ void gentestjpeg(tjhandle hnd, unsigned char *jpegbuf, unsigned long *size,
else {if(flags&TJ_ALPHAFIRST) pixformat="ARGB"; else pixformat="RGBA";}
}
if(ps==1) pixformat="Grayscale";
printf("%s %s -> %s Q%d ... ", pixformat,
(flags&TJ_BOTTOMUP)?"Bottom-Up":"Top-Down ", _subnamel[subsamp], qual);
if(yuv)
printf("%s %s -> %s YUV ... ", pixformat,
(flags&TJ_BOTTOMUP)?"Bottom-Up":"Top-Down ", _subnamel[subsamp]);
else
printf("%s %s -> %s Q%d ... ", pixformat,
(flags&TJ_BOTTOMUP)?"Bottom-Up":"Top-Down ", _subnamel[subsamp], qual);
if((bmpbuf=(unsigned char *)malloc(w*h*ps+1))==NULL)
{
@@ -246,10 +379,20 @@ void gentestjpeg(tjhandle hnd, unsigned char *jpegbuf, unsigned long *size,
_catch(tjCompress(hnd, bmpbuf, w, 0, h, ps, jpegbuf, size, subsamp, qual, flags));
t=rrtime()-t;
sprintf(tempstr, "%s_enc_%s_%s_%sQ%d.jpg", basefilename, pixformat,
(flags&TJ_BOTTOMUP)? "BU":"TD", _subnames[subsamp], qual);
if(yuv)
sprintf(tempstr, "%s_enc_%s_%s_%s.yuv", basefilename, pixformat,
(flags&TJ_BOTTOMUP)? "BU":"TD", _subnames[subsamp]);
else
sprintf(tempstr, "%s_enc_%s_%s_%sQ%d.jpg", basefilename, pixformat,
(flags&TJ_BOTTOMUP)? "BU":"TD", _subnames[subsamp], qual);
writejpeg(jpegbuf, *size, tempstr);
printf("Done. %f ms\n Result in %s\n", t*1000., tempstr);
if(yuv)
{
if(checkbufyuv(jpegbuf, *size, w, h, subsamp)) printf("Passed.");
else printf("FAILED!");
}
else printf("Done.");
printf(" %f ms\n Result in %s\n", t*1000., tempstr);
finally:
if(bmpbuf) free(bmpbuf);
@@ -261,6 +404,8 @@ void gentestbmp(tjhandle hnd, unsigned char *jpegbuf, unsigned long jpegsize,
unsigned char *bmpbuf=NULL;
const char *pixformat; int _w=0, _h=0; double t;
if(yuv) return;
if(flags&TJ_BGR)
{
if(ps==3) pixformat="BGR";
@@ -404,8 +549,16 @@ void dotest1(void)
int main(int argc, char *argv[])
{
if(argc>1 && !stricmp(argv[1], "-yuv")) yuv=1;
dotest(35, 41, 3, TJ_444, "test");
dotest(35, 41, 4, TJ_444, "test");
if(yuv)
{
dotest(35, 41, 3, TJ_422, "test");
dotest(35, 41, 4, TJ_422, "test");
dotest(35, 41, 3, TJ_420, "test");
dotest(35, 41, 4, TJ_420, "test");
}
dotest(35, 41, 1, TJ_GRAYSCALE, "test");
dotest(35, 41, 3, TJ_GRAYSCALE, "test");
dotest(35, 41, 4, TJ_GRAYSCALE, "test");

29
jpgtest.cxx
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@@ -30,7 +30,7 @@
#define _throwbmp(m) _throw(m, bmpgeterr())
int forcemmx=0, forcesse=0, forcesse2=0, forcesse3=0, fastupsample=0,
decomponly=0;
decomponly=0, yuv=0;
const int _ps[BMPPIXELFORMATS]={3, 4, 3, 4, 4, 4};
const int _flags[BMPPIXELFORMATS]={0, 0, TJ_BGR, TJ_BGR,
TJ_BGR|TJ_ALPHAFIRST, TJ_ALPHAFIRST};
@@ -76,12 +76,20 @@ void dotest(unsigned char *srcbuf, int w, int h, BMPPIXELFORMAT pf, int bu,
flags |= _flags[pf];
if(bu) flags |= TJ_BOTTOMUP;
if(yuv) flags |= TJ_YUV;
if((rgbbuf=(unsigned char *)malloc(pitch*h)) == NULL)
_throwunix("allocating image buffer");
if(!quiet) printf("\n>>>>> %s (%s) <--> JPEG %s Q%d <<<<<\n", _pfname[pf],
bu?"Bottom-up":"Top-down", _subnamel[jpegsub], qual);
if(!quiet)
{
if(yuv)
printf("\n>>>>> %s (%s) <--> YUV %s <<<<<\n", _pfname[pf],
bu?"Bottom-up":"Top-down", _subnamel[jpegsub]);
else
printf("\n>>>>> %s (%s) <--> JPEG %s Q%d <<<<<\n", _pfname[pf],
bu?"Bottom-up":"Top-down", _subnamel[jpegsub], qual);
}
if(dotile) {tilesizex=tilesizey=4;} else {tilesizex=w; tilesizey=h;}
do
@@ -155,7 +163,10 @@ void dotest(unsigned char *srcbuf, int w, int h, BMPPIXELFORMAT pf, int bu,
}
if(tilesizex==w && tilesizey==h)
{
sprintf(tempstr, "%s_%sQ%d.jpg", filename, _subnames[jpegsub], qual);
if(yuv)
sprintf(tempstr, "%s_%s.yuv", filename, _subnames[jpegsub]);
else
sprintf(tempstr, "%s_%sQ%d.jpg", filename, _subnames[jpegsub], qual);
if((outfile=fopen(tempstr, "wb"))==NULL)
_throwunix("opening reference image");
if(fwrite(jpegbuf[0], jpgbufsize, 1, outfile)!=1)
@@ -163,6 +174,7 @@ void dotest(unsigned char *srcbuf, int w, int h, BMPPIXELFORMAT pf, int bu,
fclose(outfile);
if(!quiet) printf("Reference image written to %s\n", tempstr);
}
if(yuv) goto bailout;
// Decompression test
memset(rgbbuf, 127, pitch*h); // Grey image means decompressor did nothing
@@ -371,7 +383,9 @@ void usage(char *progname)
printf(" Use fast, inaccurate upsampling code to perform 4:2:2 and 4:2:0\n");
printf(" YUV decoding in libjpeg decompressor\n\n");
printf(" [-quiet]\n");
printf(" Output in tabular rather than verbose format\n\n");
printf(" Output in tabular rather than verbose format\n");
printf(" [-yuv]\n");
printf(" Encode RGB input as planar YUV rather than compressing as JPEG\n\n");
printf(" NOTE: If the quality is specified as a range, i.e. 90-100, a separate\n");
printf(" test will be performed for all quality values in the range.\n");
exit(1);
@@ -441,6 +455,11 @@ int main(int argc, char *argv[])
printf("Using fast upsampling code\n");
fastupsample=1;
}
if(!stricmp(argv[i], "-yuv"))
{
printf("Testing YUV planar encoding\n");
yuv=1;
}
if(!stricmp(argv[i], "-rgb")) pf=BMP_RGB;
if(!stricmp(argv[i], "-rgba")) pf=BMP_RGBA;
if(!stricmp(argv[i], "-bgr")) pf=BMP_BGR;

9
turbojpeg.h
View File

@@ -53,6 +53,15 @@ enum {TJ_444=0, TJ_422, TJ_420, TJ_GRAYSCALE};
#define TJ_FASTUPSAMPLE 256
/* Use fast, inaccurate 4:2:2 and 4:2:0 YUV upsampling routines
(libjpeg version only) */
#define TJ_YUV 512
/* Use the TurboJPEG YUV encoder to produce a planar YUV image that is
suitable for X Video. Specifically, if either the width or the height is
subsampled, then that dimension is padded to 2 in the output image. Also,
each line of each plane in the output image is padded to 4 bytes.
Although this will work with any subsampling option, it is really only
useful in combination with TJ_420, which produces an image compatible
with the I420 format. */
typedef void* tjhandle;
#define TJPAD(p) (((p)+3)&(~3))

148
turbojpegl.c
View File

@@ -18,10 +18,35 @@
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define JPEG_INTERNALS
#include <jpeglib.h>
#include <jerror.h>
#include <setjmp.h>
#include "./turbojpeg.h"
#ifdef sun
#include <malloc.h>
#endif
void *__memalign(size_t boundary, size_t size)
{
#if defined(_WIN32) || defined(__APPLE__)
return malloc(size);
#else
#ifdef sun
return memalign(boundary, size);
#else
void *ptr=NULL;
posix_memalign(&ptr, boundary, size);
return ptr;
#endif
#endif
}
#ifndef min
#define min(a,b) ((a)<(b)?(a):(b))
#endif
#define PAD(v, p) ((v+(p)-1)&(~((p)-1)))
// Error handling
@@ -117,9 +142,18 @@ DLLEXPORT int DLLCALL tjCompress(tjhandle h,
int jpegsub, int qual, int flags)
{
int i; JSAMPROW *row_pointer=NULL;
JSAMPLE *_tmpbuf[MAX_COMPONENTS], *_tmpbuf2[MAX_COMPONENTS];
JSAMPROW *tmpbuf[MAX_COMPONENTS], *tmpbuf2[MAX_COMPONENTS];
JSAMPROW *outbuf[MAX_COMPONENTS];
checkhandle(h);
for(i=0; i<MAX_COMPONENTS; i++)
{
tmpbuf[i]=NULL; _tmpbuf[i]=NULL;
tmpbuf2[i]=NULL; _tmpbuf2[i]=NULL; outbuf[i]=NULL;
}
if(srcbuf==NULL || width<=0 || pitch<0 || height<=0
|| dstbuf==NULL || size==NULL
|| jpegsub<0 || jpegsub>=NUMSUBOPT || qual<0 || qual>100)
@@ -158,6 +192,14 @@ DLLEXPORT int DLLCALL tjCompress(tjhandle h,
if(setjmp(j->jerr.jb))
{ // this will execute if LIBJPEG has an error
if(row_pointer) free(row_pointer);
for(i=0; i<MAX_COMPONENTS; i++)
{
if(tmpbuf[i]!=NULL) free(tmpbuf[i]);
if(_tmpbuf[i]!=NULL) free(_tmpbuf[i]);
if(tmpbuf2[i]!=NULL) free(tmpbuf2[i]);
if(_tmpbuf2[i]!=NULL) free(_tmpbuf2[i]);
if(outbuf[i]!=NULL) free(outbuf[i]);
}
return -1;
}
@@ -180,24 +222,105 @@ DLLEXPORT int DLLCALL tjCompress(tjhandle h,
j->jdms.next_output_byte = dstbuf;
j->jdms.free_in_buffer = TJBUFSIZE(j->cinfo.image_width, j->cinfo.image_height);
if((row_pointer=(JSAMPROW *)malloc(sizeof(JSAMPROW)*height))==NULL)
_throw("Memory allocation failed in tjInitCompress()");
for(i=0; i<height; i++)
{
if(flags&TJ_BOTTOMUP) row_pointer[i]= &srcbuf[(height-i-1)*pitch];
else row_pointer[i]= &srcbuf[i*pitch];
}
jpeg_start_compress(&j->cinfo, TRUE);
while(j->cinfo.next_scanline<j->cinfo.image_height)
if(flags&TJ_YUV)
{
jpeg_write_scanlines(&j->cinfo, &row_pointer[j->cinfo.next_scanline],
j->cinfo.image_height-j->cinfo.next_scanline);
j_compress_ptr cinfo=&j->cinfo;
int row;
int pw=PAD(width, cinfo->max_h_samp_factor);
int ph=PAD(height, cinfo->max_v_samp_factor);
int cw[MAX_COMPONENTS], ch[MAX_COMPONENTS];
jpeg_component_info *compptr;
JSAMPLE *ptr=dstbuf; unsigned long yuvsize=0;
if((row_pointer=(JSAMPROW *)malloc(sizeof(JSAMPROW)*ph))==NULL)
_throw("Memory allocation failed in tjCompress()");
for(i=0; i<height; i++)
{
if(flags&TJ_BOTTOMUP) row_pointer[i]= &srcbuf[(height-i-1)*pitch];
else row_pointer[i]= &srcbuf[i*pitch];
}
if(height<ph)
for(i=height; i<ph; i++) row_pointer[i]=row_pointer[height-1];
for(i=0; i<cinfo->num_components; i++)
{
compptr=&cinfo->comp_info[i];
_tmpbuf[i]=(JSAMPLE *)__memalign(16,
PAD((compptr->width_in_blocks*cinfo->max_h_samp_factor*DCTSIZE)
/compptr->h_samp_factor, 16) * cinfo->max_v_samp_factor);
if(!_tmpbuf[i]) _throw("Memory allocation failure");
tmpbuf[i]=(JSAMPROW *)__memalign(16,
sizeof(JSAMPROW)*cinfo->max_v_samp_factor);
if(!tmpbuf[i]) _throw("Memory allocation failure");
for(row=0; row<cinfo->max_v_samp_factor; row++)
tmpbuf[i][row]=&_tmpbuf[i][
PAD((compptr->width_in_blocks*cinfo->max_h_samp_factor*DCTSIZE)
/compptr->h_samp_factor, 16) * row];
_tmpbuf2[i]=(JSAMPLE *)__memalign(16,
PAD(compptr->width_in_blocks*DCTSIZE, 16) * compptr->v_samp_factor);
if(!_tmpbuf2[i]) _throw("Memory allocation failure");
tmpbuf2[i]=(JSAMPROW *)__memalign(16,
sizeof(JSAMPROW)*compptr->v_samp_factor);
if(!tmpbuf2[i]) _throw("Memory allocation failure");
for(row=0; row<compptr->v_samp_factor; row++)
tmpbuf2[i][row]=&_tmpbuf2[i][
PAD(compptr->width_in_blocks*DCTSIZE, 16) * row];
cw[i]=pw*compptr->h_samp_factor/cinfo->max_h_samp_factor;
ch[i]=ph*compptr->v_samp_factor/cinfo->max_v_samp_factor;
outbuf[i]=(JSAMPROW *)__memalign(16, sizeof(JSAMPROW)*ch[i]);
if(!outbuf[i]) _throw("Memory allocation failure");
for(row=0; row<ch[i]; row++)
{
outbuf[i][row]=ptr;
ptr+=PAD(cw[i], 4);
}
}
yuvsize=(unsigned long)(ptr-dstbuf);
for(row=0; row<ph; row+=cinfo->max_v_samp_factor)
{
(*cinfo->cconvert->color_convert)(cinfo, &row_pointer[row], tmpbuf,
0, cinfo->max_v_samp_factor);
(cinfo->downsample->downsample)(cinfo, tmpbuf, 0, tmpbuf2, 0);
for(i=0, compptr=cinfo->comp_info; i<cinfo->num_components;
i++, compptr++)
jcopy_sample_rows(tmpbuf2[i], 0, outbuf[i],
row*compptr->v_samp_factor/cinfo->max_v_samp_factor,
compptr->v_samp_factor, cw[i]);
}
*size=yuvsize;
cinfo->next_scanline+=height;
}
else
{
if((row_pointer=(JSAMPROW *)malloc(sizeof(JSAMPROW)*height))==NULL)
_throw("Memory allocation failed in tjCompress()");
for(i=0; i<height; i++)
{
if(flags&TJ_BOTTOMUP) row_pointer[i]= &srcbuf[(height-i-1)*pitch];
else row_pointer[i]= &srcbuf[i*pitch];
}
while(j->cinfo.next_scanline<j->cinfo.image_height)
{
jpeg_write_scanlines(&j->cinfo, &row_pointer[j->cinfo.next_scanline],
j->cinfo.image_height-j->cinfo.next_scanline);
}
}
jpeg_finish_compress(&j->cinfo);
*size=TJBUFSIZE(j->cinfo.image_width, j->cinfo.image_height)
-(unsigned long)(j->jdms.free_in_buffer);
if(!(flags&TJ_YUV))
*size=TJBUFSIZE(j->cinfo.image_width, j->cinfo.image_height)
-(unsigned long)(j->jdms.free_in_buffer);
if(row_pointer) free(row_pointer);
for(i=0; i<MAX_COMPONENTS; i++)
{
if(tmpbuf[i]!=NULL) free(tmpbuf[i]);
if(_tmpbuf[i]!=NULL) free(_tmpbuf[i]);
if(tmpbuf2[i]!=NULL) free(tmpbuf2[i]);
if(_tmpbuf2[i]!=NULL) free(_tmpbuf2[i]);
if(outbuf[i]!=NULL) free(outbuf[i]);
}
return 0;
}
@@ -334,6 +457,7 @@ DLLEXPORT int DLLCALL tjDecompress(tjhandle h,
#else
#error "TurboJPEG requires JPEG colorspace extensions"
#endif
if(flags&TJ_FASTUPSAMPLE) j->dinfo.do_fancy_upsampling=FALSE;
jpeg_start_decompress(&j->dinfo);