www.pudn.com > JPEG_DEMO.rar > ClrJpegDecode.h

// ClrJpegDecode.h: interface for the CClrJpegDecode class. 
// 
////////////////////////////////////////////////////////////////////// 
 
#if !defined(AFX_CLRJPEGDECODE_H__39E767A0_C153_11D4_AF62_00D0F8006083__INCLUDED_) 
#define AFX_CLRJPEGDECODE_H__39E767A0_C153_11D4_AF62_00D0F8006083__INCLUDED_ 
 
#if _MSC_VER > 1000 
#pragma once 
#endif // _MSC_VER > 1000 
 
//////////////// 
//my code 
////////////// 
#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 
#define IDM_EXIT      2  
#define IDM_RUNLENGTH                   40056 
#define IDM_JPEG                        40058 
#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) */ 
 
//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 
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} 
							}; 
 
 
 
 
 
class CClrJpegDecode   
{ 
 
public: 
 
	CClrJpegDecode(); 
	virtual ~CClrJpegDecode(); 
 
 
public: 
 
	////////////////////////////////////////////////// 
	//Jpeg functions 
	void CClrJpegDecode::Init();	 
	BOOL ShowJpegToScreen( unsigned char *hJpegBuf,char *filename); 
	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 
	LPBITMAPINFOHEADER lpImgData; 
	BYTE	And[9];	 
	BITMAPFILEHEADER   bf; 
	BITMAPINFOHEADER   bi; 
	HPALETTE           hPalette; 
	HBITMAP            hBitmap; 
	unsigned char*     hImgData; 
	DWORD              NumColors; 
	DWORD              LineBytes; 
	DWORD              ImgWidth; 
	DWORD	           ImgHeight; 
	unsigned int       PcxBytesPerLine; 
	LPSTR              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; 
	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; 
	int				Y[4*64],U[4*64],V[4*64]; 
	DWORD			sizei,sizej; 
	short 			restart; 
	//static 
		long	iclip[1024]; 
	//static 
		long	*iclp;	 
 
}; 
 
#endif // !defined(AFX_CLRJPEGDECODE_H__39E767A0_C153_11D4_AF62_00D0F8006083__INCLUDED_)