Animated GIF

[NICOLAS Vincent]

Hello,

I've to write an application that display animated GIF, HOW should I Proceed ?
Is there MFC base class that handle this ??

Thank...

[soundman32]

I have a class that you could have. Send me your email address and I'll forward it on.

[sats]

I want to display a gif animation in a dialogbox how do i do this??

[ALM]

Please consider taking a bit of time to submit your class to CodeGuru. I'm sure some of use would love to use it!

Thanks,
Alvaro

[Gary Grant]

In the "ATL, COM, ActiveX" section of this site George Tersaakov has a control (with source code) for
displaying an animated GIF.

[NICOLAS Vincent]

I'Ve try the class of "Gary Grant" it's working but it's seem hard to handle correctly the transparent color. Send me your e-mail and I'll forward the Gary's Class to you ... :-)

[soundman32]

The class I have is basically from George Tersaakov. I took out (most of) the ActiveX stuff so I could use it more easily.
It doesn't handle transparent GIFs. Also any bugs from George's class will be in this one also.
There is some of the original ActiveX code in here still, but you can ignore this.
Anyway, here is the code I use

Header File GIF89.H

#if !defined(AFX_GIF89_H__2B971083_F709_11D2_A159_00105A568B09__INCLUDED_)
#define AFX_GIF89_H__2B971083_F709_11D2_A159_00105A568B09__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
// Gif89.h : header file
//

#define DISPOSAL_NO 0
#define DISPOSAL_NOT 4
#define DISPOSAL_RESTBACK 8
#define DISPOSAL_RESTORE 12

typedef struct
{
BYTE bit;
WORD previouscode;
WORD nextcode;
} GIFTABLE;


/////////////////////////////////////////////////////////////////////////////
// CGif89 window

class CGif89 : public CButton
{
// Construction
public:
CGif89();

// Attributes
public:

protected:
BOOL m_bAutoStart;
BOOL m_bEmbed;
BYTE m_cCurentByte,m_cPackedField;
UINT m_uBitSize,m_uPrimaryBitSize;
UINT m_uRemain,m_uReadByte,m_uBlockSize;
int m_iWidth,m_iHeight;
int m_iTop,m_iLeft;
int m_iFinishCode,m_iResetCode;
int m_iPass,m_iRow;
int m_iWidth1;
int m_iBackgroundColor;
int m_iGifSize;
int m_x,m_y;
int m_iGlobalColorSize;
int m_iDisposalMethod;
BOOL m_bTransparentIndex;
int m_iTransparentIndex;
int m_iDelayTime;
int m_iTotalReadByte;
int m_iMaxByte;
DWORD m_dwSpeed;
COLORREF m_TransparentColor;
HDC m_hDC;
BYTE* m_pcGlobalColorTable;
BYTE* m_pcBitmap;
BYTE* m_pcGif;
BYTE* m_pcGifTrack;
BOOL m_bGlass;
volatile int m_EndRun;
HBITMAP m_hRedrawBitmap;
int m_iGifWidth,m_iGifHeight;
volatile BOOL m_bLockBitmap;
TCHAR filename[_MAX_PATH];
int flag;
BOOL m_bRunMode;
BOOL m_bAutoSize1;

// Operations
public:

// Overrides
// ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(CGif89)
public:
virtual void DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct);
//}}AFX_VIRTUAL

// Implementation
public:
void Stop();
void Play();
HBITMAP FirstImage(void);
HBITMAP TakeIt(void);
HBITMAP NextImage(void);
BOOL Play1(void);
BOOL Load(LPCTSTR name);
virtual ~CGif89();

protected:
void Output(BYTE bit)
{
int tmp;
if(m_cPackedField&0x40)
{
if(m_x==m_iWidth)
{
m_x=0;
if(m_iPass==1)m_iRow+=8;
if(m_iPass==2)m_iRow+=8;
if(m_iPass==3)m_iRow+=4;
if(m_iPass==4)m_iRow+=2;
if(m_iRow>=m_iHeight){m_iPass+=1;m_iRow=16>>m_iPass;}
}
tmp=m_iRow*m_iWidth1+m_x;
m_pcBitmap[tmp]=bit;
m_x++;
}
else
{
if(m_x==m_iWidth){m_x=0;m_y++;}
tmp=m_y*m_iWidth1+m_x;
m_x++;
}
if(tmp>m_iMaxByte)return;
m_pcBitmap[tmp]=bit;
}

BYTE GetByte(void)
{
if(m_uReadByte>=m_uBlockSize)
{
m_uBlockSize=*m_pcGifTrack++;
m_uReadByte=0;
m_iTotalReadByte+=m_uBlockSize+1;
if(m_iTotalReadByte>m_iGifSize){m_iTotalReadByte-=m_uBlockSize+1;return 0xFF;}
if(m_uBlockSize==0){m_pcGifTrack--;m_iTotalReadByte--;return 0xFF;}
}
m_uReadByte++;
return *m_pcGifTrack++;
}

WORD GetCode(void)
{
UINT tmp1;
BYTE tmp;
tmp=1;
if(m_uRemain>=m_uBitSize)
{
tmp<<=m_uBitSize;
tmp--;
tmp1=m_cCurentByte&tmp;
m_cCurentByte>>=m_uBitSize;
m_uRemain-=m_uBitSize;
}
else
{
tmp<<=m_uRemain;
tmp--;
tmp1=m_cCurentByte;
m_cCurentByte=GetByte();
tmp=1;
if(8>=(m_uBitSize-m_uRemain))
{
tmp<<=(m_uBitSize-m_uRemain);
tmp--;
tmp1=(((UINT)(m_cCurentByte&tmp))<<m_uRemain)+tmp1;
m_cCurentByte>>=(m_uBitSize-m_uRemain);
m_uRemain=8-(m_uBitSize-m_uRemain);
}
else
{
tmp1=(((UINT)(m_cCurentByte))<<m_uRemain)+tmp1;
m_cCurentByte=GetByte();
tmp<<=m_uBitSize-m_uRemain-8;
tmp--;
tmp1=(((UINT)(m_cCurentByte&tmp))<<(m_uRemain+8))+tmp1;
m_cCurentByte>>=m_uBitSize-m_uRemain-8;
m_uRemain=8-(m_uBitSize-m_uRemain-8);
}
}
return tmp1;
}


// Generated message map functions
protected:
//{{AFX_MSG(CGif89)
// NOTE - the ClassWizard will add and remove member functions here.
//}}AFX_MSG

DECLARE_MESSAGE_MAP()
};

/////////////////////////////////////////////////////////////////////////////

//{{AFX_INSERT_LOCATION}}
// Microsoft Visual C++ will insert additional declarations immediately before the previous line.

#endif // !defined(AFX_GIF89_H__2B971083_F709_11D2_A159_00105A568B09__INCLUDED_)





C++ File


// Gif89.cpp : implementation file
//

#include "stdafx.h"
#include "Gif89.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CGif89

CGif89::CGif89()
{
m_bAutoStart=TRUE;
m_bAutoSize1=TRUE;
m_bEmbed=FALSE;
m_pcGlobalColorTable=0;
m_pcGif=0;
m_iGifSize=0;
m_iGlobalColorSize=0;
m_bTransparentIndex=FALSE;
m_iDelayTime=0;
m_EndRun=0;
m_dwSpeed=50;
m_hRedrawBitmap=0;
m_bLockBitmap=FALSE;
flag=0;
strcpy(filename,_T(""));
// m_bWindowOnly=TRUE;
// m_bNegotiatedWnd=FALSE;
// m_bWndLess=FALSE;
m_bRunMode=1;
// m_bResizeNatural=TRUE;
// m_bRecomposeOnResize=TRUE;
m_bGlass=FALSE;
}

CGif89::~CGif89()
{
Stop();
if(m_hRedrawBitmap!=0)
DeleteObject(m_hRedrawBitmap);
if(m_pcGlobalColorTable!=NULL)
delete[] m_pcGlobalColorTable;
if(m_pcGif!=NULL)
delete[] m_pcGif;
}


BEGIN_MESSAGE_MAP(CGif89, CButton)
//{{AFX_MSG_MAP(CGif89)
// NOTE - the ClassWizard will add and remove mapping macros here.
//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CGif89 message handlers

BOOL CGif89::Load(LPCTSTR filename)
{
HANDLE hFile;
DWORD size,size1,readbyte;
BYTE temp[13];

if(m_bEmbed)
return FALSE;
//free memory from previous image
Stop();
if(m_pcGlobalColorTable!=NULL)
delete[] m_pcGlobalColorTable;
if(m_pcGif!=NULL)
delete[] m_pcGif;
if(m_hRedrawBitmap!=0)
{
DeleteObject(m_hRedrawBitmap);
m_hRedrawBitmap=0;
};
m_pcGlobalColorTable=m_pcGif=0;
m_iTotalReadByte=0;
m_iGifSize=m_iGlobalColorSize=0;

hFile=CreateFile(filename,GENERIC_READ,FILE_SHARE_READ,NULL,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL|FILE_FLAG_SEQUENTIAL_SCAN,NULL);
if(INVALID_HANDLE_VALUE==hFile)
return FALSE;
size=GetFileSize(hFile,&size1);
if(size==0xFFFFFFFF)
{
CloseHandle(hFile);
return FALSE;
}
ReadFile(hFile,temp,13,&readbyte,NULL);
if((readbyte!=13)||((temp[0]!='G')||(temp[1]!='I')||(temp[2]!='F')||(temp[3]!='8')||((temp[4]!='7')&&(temp[4]!='9'))||(temp[5]!='a')))
{
CloseHandle(hFile);
return FALSE;
}
m_iGifWidth=*(WORD*)(temp+6);
m_iGifHeight=*(WORD*)(temp+8);
m_iBackgroundColor=temp[11];
if(temp[10]&0x80)
{
m_iGlobalColorSize=0x01<<((temp[10]&0x07)+1);
m_pcGlobalColorTable=new BYTE[3*m_iGlobalColorSize];
ReadFile(hFile,m_pcGlobalColorTable,3*m_iGlobalColorSize,&readbyte,NULL);
if(readbyte!=3*m_iGlobalColorSize)
{
delete[] m_pcGlobalColorTable;
m_pcGlobalColorTable=0;
m_iGlobalColorSize=0;
CloseHandle(hFile);
return FALSE;
}
}

m_iGifSize=size-3*m_iGlobalColorSize-12;
m_pcGifTrack=m_pcGif=new BYTE[m_iGifSize];
ReadFile(hFile,m_pcGif,m_iGifSize,&readbyte,NULL);
CloseHandle(hFile);
return TRUE;

}

BOOL CGif89::Play1()
{
HDC hDC,hMemDC,hMemDC1;
HBITMAP hOldBitmap,hOldBitmap1,hBitmap,hPreviousBitmap;
DWORD systimer1,systimer2,speed;
hDC=::GetDC(m_hWnd);
hMemDC=::CreateCompatibleDC(hDC);
hMemDC1=::CreateCompatibleDC(hDC);
m_hDC=hDC;
hPreviousBitmap=0;
while(m_bLockBitmap)
continue;
m_bLockBitmap=TRUE;
if(m_hRedrawBitmap!=0)
DeleteObject(m_hRedrawBitmap);
m_hRedrawBitmap=::CreateCompatibleBitmap(hDC,m_iGifWidth,m_iGifHeight);
hOldBitmap1=(HBITMAP)SelectObject(hMemDC1,m_hRedrawBitmap);
::BitBlt(hMemDC1,0,0,m_iGifWidth,m_iGifHeight,hDC,0,0,SRCCOPY);
SelectObject(hMemDC1,hOldBitmap1);
m_bLockBitmap=FALSE;
m_iDisposalMethod=DISPOSAL_NOT;
while(m_EndRun!=1)
{
systimer2=systimer1=GetTickCount();
while(m_bLockBitmap)
continue;

m_bLockBitmap=TRUE;
hOldBitmap1=(HBITMAP)SelectObject(hMemDC1,m_hRedrawBitmap);
//****************************************************
//Restore Background
switch(m_iDisposalMethod)
{
case DISPOSAL_NO:
break;
case DISPOSAL_NOT:
break;
case DISPOSAL_RESTBACK:
case DISPOSAL_RESTORE:
hOldBitmap=(HBITMAP)SelectObject(hMemDC,hPreviousBitmap);
::BitBlt(hMemDC1,m_iLeft,m_iTop,m_iWidth,m_iHeight,hMemDC,0,0,SRCCOPY);
SelectObject(hMemDC,hOldBitmap);
DeleteObject(hPreviousBitmap);
hPreviousBitmap=0;
break;
}

m_iDisposalMethod=DISPOSAL_NO;
//***************************************************
//Start Output Image
hBitmap=NextImage();
switch(m_iDisposalMethod)
{
case DISPOSAL_NO:
break;
case DISPOSAL_NOT:
break;
case DISPOSAL_RESTBACK:
// break;
case DISPOSAL_RESTORE:
hPreviousBitmap=::CreateCompatibleBitmap(hDC,m_iWidth,m_iHeight);
hOldBitmap=(HBITMAP)SelectObject(hMemDC,hPreviousBitmap);
::BitBlt(hMemDC,0,0,m_iWidth,m_iHeight,hMemDC1,m_iLeft,m_iTop,SRCCOPY);
SelectObject(hMemDC,hOldBitmap);
break;
}
hOldBitmap=(HBITMAP)SelectObject(hMemDC,hBitmap);
if(m_bTransparentIndex)
{
HBITMAP bmAndBack, bmAndObject;
HBITMAP bmBackOld, bmObjectOld;
HDC hdcBack, hdcObject;
COLORREF cColor;

hdcBack=::CreateCompatibleDC(hDC);
hdcObject=::CreateCompatibleDC(hDC);
bmAndBack=CreateBitmap(m_iWidth,m_iHeight,1,1,NULL);
bmAndObject=CreateBitmap(m_iWidth,m_iHeight,1,1,NULL);
bmBackOld=(HBITMAP)SelectObject(hdcBack,bmAndBack);
bmObjectOld=(HBITMAP)SelectObject(hdcObject,bmAndObject);
cColor=SetBkColor(hMemDC,m_TransparentColor);
::BitBlt(hdcObject,0,0,m_iWidth,m_iHeight,hMemDC,0,0,SRCCOPY);
SetBkColor(hMemDC,cColor);
::BitBlt(hdcBack,0,0,m_iWidth,m_iHeight,hdcObject,0,0,NOTSRCCOPY);
::BitBlt(hMemDC1,m_iLeft,m_iTop,m_iWidth,m_iHeight,hdcObject,0,0,SRCAND);
::BitBlt(hMemDC,0,0,m_iWidth,m_iHeight,hdcBack,0,0,SRCAND);
::BitBlt(hMemDC1,m_iLeft,m_iTop,m_iWidth,m_iHeight,hMemDC,0,0,SRCPAINT);
DeleteObject(SelectObject(hdcBack,bmBackOld));
DeleteObject(SelectObject(hdcObject,bmObjectOld));
DeleteDC(hdcBack);
DeleteDC(hdcObject);
}
else
{
::BitBlt(hMemDC1,m_iLeft,m_iTop,m_iWidth,m_iHeight,hMemDC,0,0,SRCCOPY);
}
SelectObject(hMemDC,hOldBitmap);
DeleteObject(hBitmap);
::BitBlt(hDC,0,0,m_iGifWidth,m_iGifHeight,hMemDC1,0,0,SRCCOPY);
SelectObject(hMemDC1,hOldBitmap1);
m_bLockBitmap=FALSE;
if(m_iDelayTime!=0)
speed=m_iDelayTime*10;
else
speed=m_dwSpeed;
while((m_EndRun!=1) && (speed>systimer2-systimer1))
{
Sleep(10);
systimer2=GetTickCount();
}
}
if(hPreviousBitmap!=0)
DeleteObject(hPreviousBitmap);
DeleteDC(hMemDC);
DeleteDC(hMemDC1);
::ReleaseDC(m_hWnd,hDC);
m_EndRun=2;
return TRUE;

}

HBITMAP CGif89::FirstImage()
{
m_pcGifTrack=m_pcGif;
m_iTotalReadByte=0;
return NextImage();
}

void CGif89:rawItem(LPDRAWITEMSTRUCT lpDrawItemStruct)
{
while(m_bLockBitmap);
m_bLockBitmap=TRUE;
HBITMAP old;
// HBRUSH br;
// OLE_COLOR backcolor;
RECT& rc = lpDrawItemStruct->rcItem;
// COLORREF cl;
HDC dc=::CreateCompatibleDC(lpDrawItemStruct->hDC);
old=(HBITMAP)::SelectObject(dc,m_hRedrawBitmap);
::BitBlt(lpDrawItemStruct->hDC,0,0,m_iGifWidth,m_iGifHeight,dc,0,0,SRCCOPY);
::SelectObject(dc,old);
m_bLockBitmap=FALSE;
DeleteDC(dc);
}

DWORD WINAPI ThreadFunc(CGif89* ptr)
{
ptr->Play1();
return 0;
}


void CGif89::Play()
{
HANDLE hThread;
DWORD ThreadId;
if(m_hWnd==0)
return ;
if(m_pcGif==0)
return ;
if(m_EndRun==5)
return ;

m_pcGifTrack=m_pcGif;
m_iTotalReadByte=0;
m_EndRun=5;
hThread=CreateThread(NULL,0,(unsigned long(_stdcall*)(void*))ThreadFunc,this,0,&ThreadId);

CloseHandle(hThread);
}

void CGif89::Stop()
{
if(m_EndRun!=5)
return ;
m_EndRun=1;
while(m_EndRun!=2)
continue;
}

HBITMAP CGif89::NextImage(void)
{
if(m_pcGif==NULL)
return 0;
l1: if(m_iTotalReadByte>m_iGifSize)
{
m_pcGifTrack=m_pcGif;
m_iTotalReadByte=0;
return 0;
}
m_iTotalReadByte++;
switch(*m_pcGifTrack++)
{
case 0x2C:
return TakeIt();
break;
case 0x21:
BYTE cSize;
m_iTotalReadByte++;
switch(*m_pcGifTrack++)
{
case 0xF9:
m_pcGifTrack++;//block size
m_iDisposalMethod=(*m_pcGifTrack)&28;
m_bTransparentIndex=(*m_pcGifTrack++)&1;
m_iDelayTime=*(WORD*)m_pcGifTrack;
m_pcGifTrack+=2;
m_iTransparentIndex=*m_pcGifTrack++;
m_iTotalReadByte+=5;
break;
case 0xFE:
while((cSize=*m_pcGifTrack)!=0){m_pcGifTrack+=cSize+1;m_iTotalReadByte+=cSize+1;if(m_iTotalReadByte>m_iGifSize)return 0;}
break;
case 0x01:
m_pcGifTrack+=13;
m_iTotalReadByte+=13;
while((cSize=*m_pcGifTrack)!=0){m_pcGifTrack+=cSize+1;m_iTotalReadByte+=cSize+1;if(m_iTotalReadByte>m_iGifSize)return 0;}
break;
case 0xFF:
m_pcGifTrack+=12;
m_iTotalReadByte+=12;
while((cSize=*m_pcGifTrack)!=0){m_pcGifTrack+=cSize+1;m_iTotalReadByte+=cSize+1;if(m_iTotalReadByte>m_iGifSize)return 0;}
break;
default:
return FALSE;
}
m_pcGifTrack++;
m_iTotalReadByte++;
if(m_iTotalReadByte>m_iGifSize)return 0;
goto l1;
break;
case 0x3B:
m_pcGifTrack=m_pcGif;
m_iTotalReadByte=0;
goto l1;
case 0:
m_pcGifTrack=m_pcGif;
m_iTotalReadByte=0;
goto l1;
default:
return FALSE;
}
}

HBITMAP CGif89::TakeIt(void)
{
UINT uLocalColorTableSize;
WORD code,oldcode,code1;
int iFinishCode,iResetCode;
int iPrimaryTableSize,iTableSize;
BITMAPINFOHEADER *bitmapheader;
BYTE *pcColorTable;
BYTE *pcInfo;
GIFTABLE *pcGifTable;
HBITMAP hBitmap;
m_iLeft=*(WORD*)m_pcGifTrack;
m_pcGifTrack+=2;
m_iTop=*(WORD*)m_pcGifTrack;
m_pcGifTrack+=2;
m_iWidth=*(WORD*)m_pcGifTrack;
m_pcGifTrack+=2;
m_iWidth1=((m_iWidth-1)|0x3)+1;
m_iHeight=*(WORD*)m_pcGifTrack;
m_pcGifTrack+=2;
m_cPackedField=*m_pcGifTrack++;
m_iTotalReadByte+=9;
m_iMaxByte=m_iWidth1*m_iHeight;
pcInfo=new BYTE[256*sizeof(RGBQUAD)+sizeof(BITMAPINFOHEADER)+m_iMaxByte+sizeof(GIFTABLE)*4096];
//1-BITMAPINFOHEADER
//2-COLORTABLE
//3-Bitmap bits
//4-GIFTABLE;
bitmapheader=(BITMAPINFOHEADER*)pcInfo;
pcColorTable=pcInfo+sizeof(BITMAPINFOHEADER);
m_pcBitmap=pcColorTable+256*sizeof(RGBQUAD);
pcGifTable=(GIFTABLE*)(m_pcBitmap+m_iMaxByte);
for(int i=0;i<4096;i++)pcGifTable[i].previouscode=pcGifTable[i].nextcode=0;
bitmapheader->biSize=sizeof(BITMAPINFOHEADER);
bitmapheader->biWidth=m_iWidth;
bitmapheader->biHeight=-m_iHeight;
bitmapheader->biPlanes=1;
bitmapheader->biBitCount=8;
bitmapheader->biCompression=BI_RGB;
bitmapheader->biSizeImage=0;
bitmapheader->biXPelsPerMeter=0;
bitmapheader->biYPelsPerMeter=0;
bitmapheader->biClrUsed=256;
bitmapheader->biClrImportant=256;

if(m_cPackedField&0x80)
{
uLocalColorTableSize=1;
uLocalColorTableSize<<=(m_cPackedField&7)+1;
if(m_bTransparentIndex)
{
m_TransparentColor=RGB(m_pcGifTrack[m_iTransparentIndex*3],m_pcGifTrack[m_iTransparentIndex*3+1],m_pcGifTrack[m_iTransparentIndex*3+2]);
}
m_iTotalReadByte+=uLocalColorTableSize*3;
for(UINT i=0;i<uLocalColorTableSize;i++)
{
pcColorTable[2]=*m_pcGifTrack++;
pcColorTable[1]=*m_pcGifTrack++;
pcColorTable[0]=*m_pcGifTrack++;
pcColorTable[3]=0;
pcColorTable+=4;
}

}
else
{
BYTE *pcGlobalColor=m_pcGlobalColorTable;
if(m_bTransparentIndex)
{
m_TransparentColor=RGB(pcGlobalColor[m_iTransparentIndex*3],pcGlobalColor[m_iTransparentIndex*3+1],pcGlobalColor[m_iTransparentIndex*3+2]);
}
for(int i=0;i<m_iGlobalColorSize;i++)
{
pcColorTable[2]=*pcGlobalColor++;
pcColorTable[1]=*pcGlobalColor++;
pcColorTable[0]=*pcGlobalColor++;
pcColorTable[3]=0;
pcColorTable+=4;
}
}
m_uPrimaryBitSize=m_uBitSize=(*m_pcGifTrack++);
m_iTotalReadByte++;
iPrimaryTableSize=iTableSize=(1<<m_uBitSize)+2;
iFinishCode=iTableSize-1;
iResetCode=iFinishCode-1;

m_uPrimaryBitSize++;
m_uBitSize++;
m_uRemain=0;
m_cCurentByte=0;
m_uBlockSize=0;
m_uReadByte=1;
m_x=m_y=0;
m_iPass=1;m_iRow=0;
while((code=GetCode())!=iFinishCode)
{
if(code==iResetCode)
{
m_uBitSize=m_uPrimaryBitSize;
iTableSize=iPrimaryTableSize;
oldcode=GetCode();
if(oldcode>iTableSize){delete[] pcInfo;return 0;}
Output((BYTE)oldcode);
continue;
}
if(code<iTableSize) //<code> exist in the string pcGifTable
{
code1=code;
WORD code2=0;
while(code1>=iPrimaryTableSize)
{
pcGifTable[code1].nextcode=code2;
code2=code1;
code1=pcGifTable[code1].previouscode;
if(code1>=code2){delete[] pcInfo;return 0;}
}
Output((BYTE)code1);
while(code2!=0)
{
Output(pcGifTable[code2].bit);
code2=pcGifTable[code2].nextcode;
}
pcGifTable[iTableSize].bit=(BYTE)code1;
pcGifTable[iTableSize].previouscode=oldcode;
iTableSize++;
if(iTableSize==(0x0001<<m_uBitSize))m_uBitSize++;
if(m_uBitSize>12)m_uBitSize=12;
oldcode=code;
}
else //<code> doesn't exist in the string pcGifTable
{
code1=oldcode;
WORD code2=0;
while(code1>=iPrimaryTableSize)
{
pcGifTable[code1].nextcode=code2;
code2=code1;
code1=pcGifTable[code1].previouscode;
if(code1>=code2){delete[] pcInfo;return 0;}
}
Output((BYTE)code1);
while(code2!=0)
{
Output(pcGifTable[code2].bit);
code2=pcGifTable[code2].nextcode;
}
Output((BYTE)code1);
pcGifTable[iTableSize].bit=(BYTE)code1;
pcGifTable[iTableSize].previouscode=oldcode;
iTableSize++;
if(iTableSize==(0x0001<<m_uBitSize))m_uBitSize++;
if(m_uBitSize>12)m_uBitSize=12;
oldcode=code;
}
}

hBitmap=CreateDIBitmap(m_hDC,bitmapheader,CBM_INIT,m_pcBitmap,(BITMAPINFO*)pcInfo,DIB_RGB_COLORS);
m_pcGifTrack++;
m_iTotalReadByte++;
delete[] pcInfo;
return hBitmap;
}

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