dib.h与dib.cpp合集

// Dib.cpp: implementation of the CDib class. // ////////////////////////////////////////////////////////////////////// #include "StdAfx.h" #include "Dib.h" #ifdef _DEBUG #undef THIS_FILE static char THIS_FILE[]=__FILE__; #define new DEBUG_NEW #endif ////////////////////////////////////////////////////////////////////// // Construction/Destruction ////////////////////////////////////////////////////////////////////// CDib::CDib() { m_hDrawDib=NULL; m_pDib=NULL; } CDib::~CDib() { Close(); } void CDib::Draw(CDC *pDC,int nWidth, int nHeight) { if(m_pDib!=NULL) { ASSERT(IsValid()); DrawDibRealize(m_hDrawDib,pDC->GetSafeHdc(),TRUE); DrawDibDraw(m_hDrawDib,pDC->GetSafeHdc(), 0, //desktop left 0, //desktop top nWidth, nHeight, (BITMAPINFOHEADER *)m_pDib, (LPVOID) GetBits(), 0, //source left 0, //source top ((BITMAPINFOHEADER *)m_pDib)->biWidth, ((BITMAPINFOHEADER *)m_pDib)->biHeight, DDF_BACKGROUNDPAL); } } CSize CDib::GetSize() { return CSize(((BITMAPINFOHEADER *)m_pDib)->biWidth, ((BITMAPINFOHEADER *)m_pDib)->biHeight); } LONG CDib::GetWidth() { return ((BITMAPINFOHEADER *)m_pDib)->biWidth; } LONG CDib::GetHeight() { return ((BITMAPINFOHEADER *)m_pDib)->biHeight; } void CDib::Close() { if(m_hDrawDib!=NULL) { DrawDibClose(m_hDrawDib); m_hDrawDib=NULL; } if(m_pDib!=NULL) { delete m_pDib; m_pDib=NULL; } } BOOL CDib::Open(const char * pzFileName) { // BITMAPFILEHEADER bmpFileHeader; CFile file; int nBmpFileHeaderSize; Close(); //drawdibopen initialize the diradib library and //returns a handle for all drawdib operations if(!(m_hDrawDib=DrawDibOpen())) goto exit; //open and read the DIB file header nBmpFileHeaderSize=sizeof(BITMAPFILEHEADER); if(!file.Open(pzFileName,CFile::modeRead | CFile::typeBinary)) goto exit; if(file.Read((void *)&bmpFileHeader,nBmpFileHeaderSize)!=(UINT)nBmpFileHeaderSize) goto failure; //validate the DIB file header by checking the first //two characters for the signature "BM" if(bmpFileHeader.bfType!=*((WORD *)"BM")) goto failure; //allocate a big chuck of global memory to store the DIB m_pDib=(BYTE *)new char [bmpFileHeader.bfSize-nBmpFileHeaderSize]; //allocate memory fail if(!m_pDib) goto failure; //read the dib into the buffer at a time using ReadHuge file.ReadHuge(m_pDib,bmpFileHeader.bfSize-nBmpFileHeaderSize); if(((BITMAPINFOHEADER *)m_pDib)->biSizeImage==0) { //the application that create this bitmap didn't fill //in the biSizeImage field. Let's fill it //in even though the DrawDib * functions don't need it. BITMAPINFOHEADER *pDib=(BITMAPINFOHEADER *)m_pDib; //scan lines must be DWord aligned, hence the strange bit stuff pDib->biSizeImage=((((pDib->biWidth*pDib->biBitCount)+31)&~31)>>3)*pDib->biHeight; } m_pDibBits=GetBits(); file.Close(); return TRUE; failure: file.Close(); exit: Close(); return FALSE; } BOOL CDib::Save(const char * pzFileName) { // BITMAPFILEHEADER bmpFileHeader; CFile file; int nBmpFileHeaderSize; //open and read the DIB file header nBmpFileHeaderSize=sizeof(BITMAPFILEHEADER); if(!file.Open(pzFileName,CFile::modeCreate | CFile::modeWrite | CFile::typeBinary)) goto exit; file.Write(&bmpFileHeader,nBmpFileHeaderSize); //allocate memory fail if(!m_pDib) goto failure; //read the dib into the buffer at a time using ReadHuge file.WriteHuge(m_pDib,bmpFileHeader.bfSize-nBmpFileHeaderSize); file.Close(); return TRUE; failure: file.Close(); exit: return FALSE; } BYTE * CDib::GetBits() { //the size of the color map is determined by the number //of RGBQUAD structures presend. //it also depends on the bit_depth of the Dib DWORD dwNumColors,dwColorTableSize; BITMAPINFOHEADER *lpDib=(BITMAPINFOHEADER *)m_pDib; WORD wBitCount=lpDib->biBitCount; if(lpDib->biSize>=36) dwNumColors=lpDib->biClrUsed; else dwNumColors=0; if(dwNumColors==0) { if(wBitCount!=24) dwNumColors=1L<<wBitCount; else dwNumColors=0; } dwColorTableSize=dwNumColors*sizeof(RGBQUAD); return m_pDib+lpDib->biSize+dwColorTableSize; } int CDib::GetBiBitCount() { if(m_pDib!=NULL) return ((BITMAPINFOHEADER *)m_pDib)->biBitCount; return 0; }