www.pudn.com > simplejpegforembedded.rar > simplejpeg.cpp
// simplejpeg.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
//header file
//#include "bmp.h"
//*************************************************************************************
//#include "jpeg.h"
#pragma pack(1)
#define M_SOF0 0xc0
#define M_DHT 0xc4
#define M_EOI 0xd9
#define M_SOS 0xda
#define M_DQT 0xdb
#define M_DRI 0xdd
#define M_APP0 0xe0
static int Zig_Zag[8][8]={{0,1,5,6,14,15,27,28},
{2,4,7,13,16,26,29,42},
{3,8,12,17,25,30,41,43},
{9,11,18,24,37,40,44,53},
{10,19,23,32,39,45,52,54},
{20,22,33,38,46,51,55,60},
{21,34,37,47,50,56,59,61},
{35,36,48,49,57,58,62,63}
};
#define W1 2841 /* 2048*sqrt(2)*cos(1*pi/16) */
#define W2 2676 /* 2048*sqrt(2)*cos(2*pi/16) */
#define W3 2408 /* 2048*sqrt(2)*cos(3*pi/16) */
#define W5 1609 /* 2048*sqrt(2)*cos(5*pi/16) */
#define W6 1108 /* 2048*sqrt(2)*cos(6*pi/16) */
#define W7 565 /* 2048*sqrt(2)*cos(7*pi/16) */
//*************************************************************************************
typedef char CHAR;
typedef short SHORT;
typedef long LONG;
typedef unsigned long DWORD;
typedef int BOOL;
typedef unsigned char BYTE;
typedef unsigned short WORD;
typedef int HFILE;
typedef CHAR *LPSTR, *PSTR;
#define FALSE 0
#define TRUE 1
typedef struct tagBITMAPINFOHEADER{
DWORD biSize;
LONG biWidth;
LONG biHeight;
WORD biPlanes;
WORD biBitCount;
DWORD biCompression;
DWORD biSizeImage;
LONG biXPelsPerMeter;
LONG biYPelsPerMeter;
DWORD biClrUsed;
DWORD biClrImportant;
} BITMAPINFOHEADER, * LPBITMAPINFOHEADER,*PBITMAPINFOHEADER;
typedef struct tagBITMAPFILEHEADER {
WORD bfType;
DWORD bfSize;
WORD bfReserved1;
WORD bfReserved2;
DWORD bfOffBits;
} BITMAPFILEHEADER, * LPBITMAPFILEHEADER,*PBITMAPFILEHEADER;
/* constants for the biCompression field */
#define BI_RGB 0L
#define BI_RLE8 1L
#define BI_RLE4 2L
#define BI_BITFIELDS 3L
typedef struct tagRGBQUAD {
BYTE rgbBlue;
BYTE rgbGreen;
BYTE rgbRed;
BYTE rgbReserved;
} RGBQUAD;
typedef RGBQUAD * LPRGBQUAD;
#define MAKEWORD(a, b) ((WORD)(((BYTE)(a)) | ((WORD)((BYTE)(b))) << 8))
#define MAKELONG(a, b) ((LONG)(((WORD)(a)) | ((DWORD)((WORD)(b))) << 16))
#define LOWORD(l) ((WORD)(l))
#define HIWORD(l) ((WORD)(((DWORD)(l) >> 16) & 0xFFFF))
#define LOBYTE(w) ((BYTE)(w))
#define HIBYTE(w) ((BYTE)(((WORD)(w) >> 8) & 0xFF))
//---yk--- add
#include "memory.h"
#include "math.h"
#include "stdio.h"
//macro definition
#define WIDTHBYTES(i) ((i+31)/32*4)//??????????
#define PI 3.1415926535
//define return value of function
#define FUNC_OK 0
#define FUNC_MEMORY_ERROR 1
#define FUNC_FILE_ERROR 2
#define FUNC_FORMAT_ERROR 3
//////////////////////////////////////////////////
//Jpeg functions
BOOL LoadJpegFile(char *BmpFileName);
void showerror(int funcret);
int InitTag();
void InitTable();
int Decode();
int DecodeMCUBlock();
int HufBlock(BYTE dchufindex,BYTE achufindex);
int DecodeElement();
void IQtIZzMCUComponent(short flag);
void IQtIZzBlock(short *s ,int * d,short flag);
void GetYUV(short flag);
void StoreBuffer();
BYTE ReadByte();
void Initialize_Fast_IDCT();
void Fast_IDCT(int * block);
void idctrow(int * blk);
void idctcol(int * blk);
//////////////////////////////////////////////////
//global variable declaration
BITMAPFILEHEADER bf;
BITMAPINFOHEADER bi;
//HPALETTE hPalette=NULL;
//HBITMAP hBitmap=NULL;
char * hImgData=NULL;
DWORD NumColors;
DWORD LineBytes;
DWORD ImgWidth=0 , ImgHeight=0;
char* lpPtr;
//////////////////////////////////////////////////
//variables used in jpeg function
short SampRate_Y_H,SampRate_Y_V;
short SampRate_U_H,SampRate_U_V;
short SampRate_V_H,SampRate_V_V;
short H_YtoU,V_YtoU,H_YtoV,V_YtoV;
short Y_in_MCU,U_in_MCU,V_in_MCU;
unsigned char *lpJpegBuf;
unsigned char *lp;
short qt_table[3][64];
short comp_num;
BYTE comp_index[3];
BYTE YDcIndex,YAcIndex,UVDcIndex,UVAcIndex;
BYTE HufTabIndex;
short *YQtTable,*UQtTable,*VQtTable;
BYTE And[9]={0,1,3,7,0xf,0x1f,0x3f,0x7f,0xff};
short code_pos_table[4][16],code_len_table[4][16];
unsigned short code_value_table[4][256];
unsigned short huf_max_value[4][16],huf_min_value[4][16];
short BitPos,CurByte;
short rrun,vvalue;
short MCUBuffer[10*64];
int QtZzMCUBuffer[10*64];
short BlockBuffer[64];
short ycoef,ucoef,vcoef;
BOOL IntervalFlag;
short interval=0;
int Y[4*64],U[4*64],V[4*64];
DWORD sizei,sizej;
short restart;
static long iclip[1024];
static long *iclp;
////////////////////////////////////////////////////////////////
BOOL LoadJpegFile (char *JpegFileName)
{
FILE* hfjpg;
DWORD ImgSize;
DWORD BufSize,JpegBufSize;
FILE* hfbmp;
FILE* IMGdata;
void * hJpegBuf;
int funcret;
LPBITMAPINFOHEADER lpImgData;
char * hImgData256;
if((hfjpg=fopen(JpegFileName,"rb"))==NULL)
{
showerror(FUNC_FILE_ERROR);
return FALSE;
}
/*SEEK_CUR
Current position of file pointer.
SEEK_END
End of file.
SEEK_SET
Beginning of file.*/
//get jpg file length
fseek(hfjpg,0L,SEEK_END);
JpegBufSize=ftell(hfjpg);
//rewind to the beginning of the file
fseek(hfjpg,0L,SEEK_SET);
if((hJpegBuf=malloc(JpegBufSize))==NULL)
{
fclose(hfjpg);
showerror(FUNC_MEMORY_ERROR);
return FALSE;
}
lpJpegBuf=(unsigned char *)hJpegBuf;
fread((unsigned char *)hJpegBuf,sizeof( char ),JpegBufSize,hfjpg);
fclose(hfjpg);
InitTable();
if((funcret=InitTag())!=FUNC_OK)
{
// GlobalUnlock(hJpegBuf);
free(hJpegBuf);
showerror(funcret);
return FALSE;
}
//create new bitmapfileheader and bitmapinfoheader
memset((char *)&bf,0,sizeof(BITMAPFILEHEADER));
memset((char *)&bi,0,sizeof(BITMAPINFOHEADER));
bi.biSize=(DWORD)sizeof(BITMAPINFOHEADER);
bi.biWidth=(LONG)(ImgWidth);
bi.biHeight=(LONG)(ImgHeight);
bi.biPlanes=1;
bi.biBitCount=24;
bi.biClrUsed=0;
bi.biClrImportant=0;
bi.biCompression=BI_RGB;
NumColors=0;
LineBytes=(DWORD)WIDTHBYTES(bi.biWidth*bi.biBitCount);//??????????/
ImgSize=(DWORD)LineBytes*bi.biHeight;//???????
bf.bfType=0x4d42;
int a= sizeof(BITMAPFILEHEADER);
int b= sizeof(BITMAPINFOHEADER);
//注意字节对齐问题!!!!!!!!!!!!!!!!!!!!!!!!1
//如果没有#pragma pack(1)，a是16~~~~~~~
int c=NumColors*sizeof(RGBQUAD);
bf.bfSize=sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER)+NumColors*sizeof(RGBQUAD)+ImgSize;
bf.bfOffBits=54;//(DWORD)(NumColors*sizeof(RGBQUAD)+sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER));
BufSize=bf.bfSize-sizeof(BITMAPFILEHEADER);
if((hImgData=(char*)malloc(BufSize))==NULL)
{
//GlobalUnlock(hJpegBuf);
free(hJpegBuf);
showerror(FUNC_MEMORY_ERROR);
return FALSE;
}
// lpImgData=(LPBITMAPINFOHEADER)GlobalLock(hImgData);
lpImgData=(LPBITMAPINFOHEADER)hImgData;
memcpy(lpImgData,(char *)&bi,sizeof(BITMAPINFOHEADER));
lpPtr=(char *)lpImgData+sizeof(BITMAPINFOHEADER);
if((SampRate_Y_H==0)||(SampRate_Y_V==0))
{
// GlobalUnlock(hJpegBuf);
free(hJpegBuf);
//GlobalUnlock(hImgData);
free(hImgData);
hImgData=NULL;
showerror(FUNC_FORMAT_ERROR);
return FALSE ;
}
funcret=Decode();
if(funcret==FUNC_OK)
{
//hDc=GetDC(hWnd);
/* hBitmap=CreateDIBitmap(hDc, (LPBITMAPINFOHEADER)lpImgData, (LONG)CBM_INIT,
(LPSTR)lpImgData+sizeof(BITMAPINFOHEADER) +NumColors*sizeof(RGBQUAD),
(LPBITMAPINFO)lpImgData, DIB_RGB_COLORS);
*/
// hfbmp=fopen("c:\\jpeg2-bmp.bmp","Wb");
if((hfbmp=fopen("c:\\jpeg2-bmp.bmp","wb"))==NULL)
{
showerror(FUNC_FILE_ERROR);
return FALSE;
}
// hfbmp=fopen("c:\\jpeg2-bmp.bmp","Wb");
fwrite((LPSTR)&bf,sizeof(BITMAPFILEHEADER),1,hfbmp);
fwrite((LPSTR)lpImgData,sizeof(char),BufSize,hfbmp);
if((IMGdata=fopen("c:\\111.txt","wb"))==NULL)
{
showerror(FUNC_FILE_ERROR);
return FALSE;
}
DWORD xx = ImgWidth*ImgHeight;
if(( hImgData256=(char *)malloc(xx))==NULL)
{
//GlobalUnlock(hJpegBuf);
free(hImgData256);
showerror(FUNC_MEMORY_ERROR);
return FALSE;
}
char * temp=hImgData256;
for(DWORD i=0; i < xx; i++)
{
i;
char t3=*lpPtr;
t3 &= 0xE0;
char t1=*(lpPtr+1);
t1 = t1>>3;
t1 &= 0x1c;
char t2=*(lpPtr+2);
t2=t2>>6;
t2 &= 0x03;
char t4 = t3 + t1 + t2 ;
*temp++=t4;
lpPtr=lpPtr+ 3;//不能使用temp+=3;
}
int count=fwrite(hImgData256,sizeof(char),xx,IMGdata);
//free((void*)hImgData256);
fclose(IMGdata);
fclose(hfbmp);
// ReleaseDC(hWnd,hDc);
// GlobalUnlock(hJpegBuf);
free(hJpegBuf);
//GlobalUnlock(hImgData);
return TRUE;
}
else
{
//GlobalUnlock(hJpegBuf);
free(hJpegBuf);
// GlobalUnlock(hImgData);
free(hImgData);
hImgData=NULL;
showerror(funcret);
return FALSE;
}
}
/////////////////////////////////////////////////
void showerror(int funcret)
{
switch(funcret)
{
case FUNC_MEMORY_ERROR:
printf("Error alloc memory\n!");
break;
case FUNC_FILE_ERROR:
printf("File not found!\n");
break;
case FUNC_FORMAT_ERROR:
printf("File format error!\n");
break;
}
}
////////////////////////////////////////////////////////////////////////////////
int InitTag()
{
BOOL finish=FALSE;
BYTE id;
short llength;
short i,j,k;
short huftab1,huftab2;
short huftabindex;
BYTE hf_table_index;
BYTE qt_table_index;
BYTE comnum;
unsigned char *lptemp;
short ccount;
lp=lpJpegBuf+2;
while (!finish){
id=*(lp+1);
lp+=2;
switch (id){
case M_APP0:
llength=MAKEWORD(*(lp+1),*lp);
lp+=llength;
break;
case M_DQT:
llength=MAKEWORD(*(lp+1),*lp);
qt_table_index=(*(lp+2))&0x0f;
lptemp=lp+3;
if(llength<80){
for(i=0;i<64;i++)
qt_table[qt_table_index][i]=(short)*(lptemp++);
}
else{
for(i=0;i<64;i++)
qt_table[qt_table_index][i]=(short)*(lptemp++);
qt_table_index=(*(lptemp++))&0x0f;
for(i=0;i<64;i++)
qt_table[qt_table_index][i]=(short)*(lptemp++);
}
lp+=llength;
break;
case M_SOF0:
llength=MAKEWORD(*(lp+1),*lp);
ImgHeight=MAKEWORD(*(lp+4),*(lp+3));
ImgWidth=MAKEWORD(*(lp+6),*(lp+5));
comp_num=*(lp+7);
if((comp_num!=1)&&(comp_num!=3))
return FUNC_FORMAT_ERROR;
if(comp_num==3){
comp_index[0]=*(lp+8);
SampRate_Y_H=(*(lp+9))>>4;
SampRate_Y_V=(*(lp+9))&0x0f;
YQtTable=(short *)qt_table[*(lp+10)];
comp_index[1]=*(lp+11);
SampRate_U_H=(*(lp+12))>>4;
SampRate_U_V=(*(lp+12))&0x0f;
UQtTable=(short *)qt_table[*(lp+13)];
comp_index[2]=*(lp+14);
SampRate_V_H=(*(lp+15))>>4;
SampRate_V_V=(*(lp+15))&0x0f;
VQtTable=(short *)qt_table[*(lp+16)];
}
else{
comp_index[0]=*(lp+8);
SampRate_Y_H=(*(lp+9))>>4;
SampRate_Y_V=(*(lp+9))&0x0f;
YQtTable=(short *)qt_table[*(lp+10)];
comp_index[1]=*(lp+8);
SampRate_U_H=1;
SampRate_U_V=1;
UQtTable=(short *)qt_table[*(lp+10)];
comp_index[2]=*(lp+8);
SampRate_V_H=1;
SampRate_V_V=1;
VQtTable=(short *)qt_table[*(lp+10)];
}
lp+=llength;
break;
case M_DHT:
llength=MAKEWORD(*(lp+1),*lp);
if (llength<0xd0){
huftab1=(short)(*(lp+2))>>4; //huftab1=0,1
huftab2=(short)(*(lp+2))&0x0f; //huftab2=0,1
huftabindex=huftab1*2+huftab2;
lptemp=lp+3;
for (i=0; i<16; i++)
code_len_table[huftabindex][i]=(short)(*(lptemp++));
j=0;
for (i=0; i<16; i++)
if(code_len_table[huftabindex][i]!=0){
k=0;
while(k>4; //huftab1=0,1
huftab2=(short)hf_table_index&0x0f; //huftab2=0,1
huftabindex=huftab1*2+huftab2;
lptemp=lp+1;
ccount=0;
for (i=0; i<16; i++){
code_len_table[huftabindex][i]=(short)(*(lptemp++));
ccount+=code_len_table[huftabindex][i];
}
ccount+=17;
j=0;
for (i=0; i<16; i++)
if(code_len_table[huftabindex][i]!=0){
k=0;
while(k>4; //Y
YAcIndex=((*(lptemp+1))&0x0f)+2;
}
else{
UVDcIndex=(*(lptemp+1))>>4; //U,V
UVAcIndex=((*(lptemp+1))&0x0f)+2;
}
lptemp+=2;
}
lp+=llength;
finish=TRUE;
break;
case M_EOI:
return FUNC_FORMAT_ERROR;
break;
default:
if ((id&0xf0)!=0xd0){
llength=MAKEWORD(*(lp+1),*lp);
lp+=llength;
}
else lp+=2;
break;
} //switch
} //while
return FUNC_OK;
}
/////////////////////////////////////////////////////////////////
void InitTable()
{
short i,j;
sizei=sizej=0;
ImgWidth=ImgHeight=0;
rrun=vvalue=0;
BitPos=0;
CurByte=0;
IntervalFlag=FALSE;
restart=0;
for(i=0;i<3;i++)
for(j=0;j<64;j++)
qt_table[i][j]=0;
comp_num=0;
HufTabIndex=0;
for(i=0;i<3;i++)
comp_index[i]=0;
for(i=0;i<4;i++)
for(j=0;j<16;j++){
code_len_table[i][j]=0;
code_pos_table[i][j]=0;
huf_max_value[i][j]=0;
huf_min_value[i][j]=0;
}
for(i=0;i<4;i++)
for(j=0;j<256;j++)
code_value_table[i][j]=0;
for(i=0;i<10*64;i++){
MCUBuffer[i]=0;
QtZzMCUBuffer[i]=0;
}
for(i=0;i<64;i++){
Y[i]=0;
U[i]=0;
V[i]=0;
BlockBuffer[i]=0;
}
ycoef=ucoef=vcoef=0;
}
/////////////////////////////////////////////////////////////////////////
int Decode()
{
int funcret;
Y_in_MCU=SampRate_Y_H*SampRate_Y_V;
U_in_MCU=SampRate_U_H*SampRate_U_V;
V_in_MCU=SampRate_V_H*SampRate_V_V;
H_YtoU=SampRate_Y_H/SampRate_U_H;
V_YtoU=SampRate_Y_V/SampRate_U_V;
H_YtoV=SampRate_Y_H/SampRate_V_H;
V_YtoV=SampRate_Y_V/SampRate_V_V;
Initialize_Fast_IDCT();
while((funcret=DecodeMCUBlock())==FUNC_OK){
interval++;
if((restart)&&(interval % restart==0))
IntervalFlag=TRUE;
else
IntervalFlag=FALSE;
IQtIZzMCUComponent(0);
IQtIZzMCUComponent(1);
IQtIZzMCUComponent(2);
GetYUV(0);
GetYUV(1);
GetYUV(2);
StoreBuffer();
sizej+=SampRate_Y_H*8;
if(sizej>=ImgWidth){
sizej=0;
sizei+=SampRate_Y_V*8;
}
if ((sizej==0)&&(sizei>=ImgHeight))
break;
}
return funcret;
}
/////////////////////////////////////////////////////////////////////////////////////////
void GetYUV(short flag)
{
short H,VV;
short i,j,k,h;
int *buf;
int *pQtZzMCU;
switch(flag){
case 0:
H=SampRate_Y_H;
VV=SampRate_Y_V;
buf=Y;
pQtZzMCU=QtZzMCUBuffer;
break;
case 1:
H=SampRate_U_H;
VV=SampRate_U_V;
buf=U;
pQtZzMCU=QtZzMCUBuffer+Y_in_MCU*64;
break;
case 2:
H=SampRate_V_H;
VV=SampRate_V_V;
buf=V;
pQtZzMCU=QtZzMCUBuffer+(Y_in_MCU+U_in_MCU)*64;
break;
}
for (i=0;i>8;
gg=((y<<8)-159*u-220*v)>>8;
bb=((y<<8)+411*u-29*v)>>8;
R=(unsigned char)rr;
G=(unsigned char)gg;
B=(unsigned char)bb;
if (rr&0xffffff00) if (rr>255) R=255; else if (rr<0) R=0;
if (gg&0xffffff00) if (gg>255) G=255; else if (gg<0) G=0;
if (bb&0xffffff00) if (bb>255) B=255; else if (bb<0) B=0;
*lpbmp++=B;
*lpbmp++=G;
*lpbmp++=R;
}
else break;
}
}
else break;
}
}
///////////////////////////////////////////////////////////////////////////////
int DecodeMCUBlock()
{
short *lpMCUBuffer;
short i,j;
int funcret;
if (IntervalFlag){
lp+=2;
ycoef=ucoef=vcoef=0;
BitPos=0;
CurByte=0;
}
switch(comp_num){
case 3:
lpMCUBuffer=MCUBuffer;
for (i=0;i=1){
BitPos--;
thiscode=(BYTE)CurByte>>BitPos;
CurByte=CurByte&And[BitPos];
}
else{
lastbyte=ReadByte();
BitPos--;
newbyte=CurByte&And[BitPos];
thiscode=lastbyte>>7;
CurByte=newbyte;
}
codelen=1;
while ((thiscodehuf_max_value[HufTabIndex][codelen-1]))
{
if(BitPos>=1){
BitPos--;
tempcode=(BYTE)CurByte>>BitPos;
CurByte=CurByte&And[BitPos];
}
else{
lastbyte=ReadByte();
BitPos--;
newbyte=CurByte&And[BitPos];
tempcode=(BYTE)lastbyte>>7;
CurByte=newbyte;
}
thiscode=(thiscode<<1)+tempcode;
codelen++;
if(codelen>16)
return FUNC_FORMAT_ERROR;
} //while
temp=thiscode-huf_min_value[HufTabIndex][codelen-1]+code_pos_table[HufTabIndex][codelen-1];
hufexbyte=(BYTE)code_value_table[HufTabIndex][temp];
rrun=(short)(hufexbyte>>4);
runsize=hufexbyte&0x0f;
if(runsize==0){
vvalue=0;
return FUNC_OK;
}
tempsize=runsize;
if(BitPos>=runsize){
BitPos-=runsize;
valueex=(BYTE)CurByte>>BitPos;
CurByte=CurByte&And[BitPos];
}
else{
valueex=CurByte;
tempsize-=BitPos;
while(tempsize>8){
lastbyte=ReadByte();
valueex=(valueex<<8)+(BYTE)lastbyte;
tempsize-=8;
} //while
lastbyte=ReadByte();
BitPos-=tempsize;
valueex=(valueex<>BitPos);
CurByte=lastbyte&And[BitPos];
} //else
sign=valueex>>(runsize-1);
if(sign)
vvalue=valueex;
else{
valueex=valueex^0xffff;
temp=0xffff<255) ? 255 : i);
}
////////////////////////////////////////////////////////////////////////
void idctrow(int * blk)
{
int x0, x1, x2, x3, x4, x5, x6, x7, x8;
//intcut
if (!((x1 = blk[4]<<11) | (x2 = blk[6]) | (x3 = blk[2]) |
(x4 = blk[1]) | (x5 = blk[7]) | (x6 = blk[5]) | (x7 = blk[3])))
{
blk[0]=blk[1]=blk[2]=blk[3]=blk[4]=blk[5]=blk[6]=blk[7]=blk[0]<<3;
return;
}
x0 = (blk[0]<<11) + 128; // for proper rounding in the fourth stage
//first stage
x8 = W7*(x4+x5);
x4 = x8 + (W1-W7)*x4;
x5 = x8 - (W1+W7)*x5;
x8 = W3*(x6+x7);
x6 = x8 - (W3-W5)*x6;
x7 = x8 - (W3+W5)*x7;
//second stage
x8 = x0 + x1;
x0 -= x1;
x1 = W6*(x3+x2);
x2 = x1 - (W2+W6)*x2;
x3 = x1 + (W2-W6)*x3;
x1 = x4 + x6;
x4 -= x6;
x6 = x5 + x7;
x5 -= x7;
//third stage
x7 = x8 + x3;
x8 -= x3;
x3 = x0 + x2;
x0 -= x2;
x2 = (181*(x4+x5)+128)>>8;
x4 = (181*(x4-x5)+128)>>8;
//fourth stage
blk[0] = (x7+x1)>>8;
blk[1] = (x3+x2)>>8;
blk[2] = (x0+x4)>>8;
blk[3] = (x8+x6)>>8;
blk[4] = (x8-x6)>>8;
blk[5] = (x0-x4)>>8;
blk[6] = (x3-x2)>>8;
blk[7] = (x7-x1)>>8;
}
//////////////////////////////////////////////////////////////////////////////
void idctcol(int * blk)
{
int x0, x1, x2, x3, x4, x5, x6, x7, x8;
//intcut
if (!((x1 = (blk[8*4]<<8)) | (x2 = blk[8*6]) | (x3 = blk[8*2]) |
(x4 = blk[8*1]) | (x5 = blk[8*7]) | (x6 = blk[8*5]) | (x7 = blk[8*3])))
{
blk[8*0]=blk[8*1]=blk[8*2]=blk[8*3]=blk[8*4]=blk[8*5]
=blk[8*6]=blk[8*7]=iclp[(blk[8*0]+32)>>6];
return;
}
x0 = (blk[8*0]<<8) + 8192;
//first stage
x8 = W7*(x4+x5) + 4;
x4 = (x8+(W1-W7)*x4)>>3;
x5 = (x8-(W1+W7)*x5)>>3;
x8 = W3*(x6+x7) + 4;
x6 = (x8-(W3-W5)*x6)>>3;
x7 = (x8-(W3+W5)*x7)>>3;
//second stage
x8 = x0 + x1;
x0 -= x1;
x1 = W6*(x3+x2) + 4;
x2 = (x1-(W2+W6)*x2)>>3;
x3 = (x1+(W2-W6)*x3)>>3;
x1 = x4 + x6;
x4 -= x6;
x6 = x5 + x7;
x5 -= x7;
//third stage
x7 = x8 + x3;
x8 -= x3;
x3 = x0 + x2;
x0 -= x2;
x2 = (181*(x4+x5)+128)>>8;
x4 = (181*(x4-x5)+128)>>8;
//fourth stage
blk[8*0] = iclp[(x7+x1)>>14];
blk[8*1] = iclp[(x3+x2)>>14];
blk[8*2] = iclp[(x0+x4)>>14];
blk[8*3] = iclp[(x8+x6)>>14];
blk[8*4] = iclp[(x8-x6)>>14];
blk[8*5] = iclp[(x0-x4)>>14];
blk[8*6] = iclp[(x3-x2)>>14];
blk[8*7] = iclp[(x7-x1)>>14];
}
int main(int argc, char* argv[])
{
LoadJpegFile("c:\\test.jpg");
return 0;
}