// DIB.h:類CDib聲明頭文件 #ifndef __DIB_H__ #define __DIB_H__ #include <wingdi.h> class CDib { public: CDib(); ~CDib(); BOOL Load( const char * ); BOOL Save( const char * ); BOOL Draw( CDC *, int nX = 0, int nY = 0, int nWidth = -1, int nHeight = -1, int mode = SRCCOPY); BOOL SetPalette( CDC * ); private: CPalette m_Palette; unsigned char *m_pDib, *m_pDibBits; DWORD m_dwDibSize; BITMAPINFOHEADER *m_pBIH; RGBQUAD *m_pPalette; int m_nPaletteEntries; }; #endif |
// DIB.cpp:類CDib實現(xiàn)文件 #include "stdafx.h" #include "DIB.h" CDib::CDib() { m_pDib = NULL; } CDib::~CDib() { // 如果位圖已經(jīng)被加載,釋放內(nèi)存 if (m_pDib != NULL) delete []m_pDib; } |
BOOL CDib::Load(const char *pszFilename) { CFile cf; // 打開位圖文件 if (!cf.Open(pszFilename, CFile::modeRead)) return (FALSE); // 獲得位圖文件大小,并減去BITMAPFILEHEADER的長度 DWORD dwDibSize; dwDibSize = cf.GetLength() - sizeof(BITMAPFILEHEADER); // 為DIB位圖分配內(nèi)存 unsigned char *pDib; pDib = new unsigned char[dwDibSize]; if (pDib == NULL) return (FALSE); BITMAPFILEHEADER BFH; // 讀取位圖文件數(shù)據(jù) try { // 文件格式是否正確有效 if ( cf.Read(&BFH, sizeof(BITMAPFILEHEADER)) != sizeof(BITMAPFILEHEADER) || BFH.bfType != ’MB’ || cf.Read(pDib, dwDibSize) != dwDibSize) { delete []pDib; return (FALSE); } } catch (CFileException *e) { e->Delete(); delete []pDib; return (FALSE); } // delete先前加載的位圖 if (m_pDib != NULL) delete m_pDib; // 將臨時Dib數(shù)據(jù)指針和Dib大小變量賦給類成員變量 m_pDib = pDib; m_dwDibSize = dwDibSize; // 為相應(yīng)類成員變量賦BITMAPINFOHEADER和調(diào)色板指針 m_pBIH = (BITMAPINFOHEADER*)m_pDib; m_pPalette = (RGBQUAD*) &m_pDib[sizeof(BITMAPINFOHEADER)]; // 計算調(diào)色板中實際顏色數(shù)量 m_nPaletteEntries = 1 << m_pBIH->biBitCount; if (m_pBIH->biBitCount > 8) m_nPaletteEntries = 0; else if (m_pBIH->biClrUsed != 0) m_nPaletteEntries = m_pBIH->biClrUsed; // 為相應(yīng)類成員變量賦image data指針 m_pDibBits = &m_pDib[sizeof(BITMAPINFOHEADER) + m_nPaletteEntries * sizeof (RGBQUAD)]; // delete先前的調(diào)色板 if (m_Palette.GetSafeHandle() != NULL) m_Palette.DeleteObject(); // 如果位圖中存在調(diào)色板,創(chuàng)建LOGPALETTE 及CPalette if (m_nPaletteEntries != 0) { LOGPALETTE *pLogPal = (LOGPALETTE*)new char[sizeof(LOGPALETTE) + m_nPaletteEntries *sizeof(PALETTEENTRY)]; if (pLogPal != NULL) { pLogPal->palVersion = 0x300; pLogPal->palNumEntries = m_nPaletteEntries; for (int i = 0; i < m_nPaletteEntries; i++) { pLogPal->palPalEntry[i].peRed = m_pPalette[i].rgbRed; pLogPal->palPalEntry[i].peGreen = m_pPalette[i].rgbGreen; pLogPal->palPalEntry[i].peBlue = m_pPalette[i].rgbBlue; } //創(chuàng)建CPalette并釋放LOGPALETTE的內(nèi)存 m_Palette.CreatePalette(pLogPal); delete []pLogPal; } } return (TRUE); } //函數(shù)功能:保存位圖入BMP文件 BOOL CDib::Save(const char *pszFilename) { if (m_pDib == NULL) return (FALSE); CFile cf; if (!cf.Open(pszFilename, CFile::modeCreate | CFile::modeWrite)) return (FALSE); try { BITMAPFILEHEADER BFH; memset(&BFH, 0, sizeof(BITMAPFILEHEADER)); BFH.bfType = ’MB’; BFH.bfSize = sizeof(BITMAPFILEHEADER) + m_dwDibSize; BFH.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) + m_nPaletteEntries *sizeof(RGBQUAD); cf.Write(&BFH, sizeof(BITMAPFILEHEADER)); cf.Write(m_pDib, m_dwDibSize); } catch (CFileException *e) { e->Delete(); return (FALSE); } return (TRUE); } |
BOOL CDib::Draw(CDC *pDC, int nX, int nY, int nWidth, int nHeight, int mode) { if (m_pDib == NULL) return (FALSE); // 獲取位圖寬度和高度賦值 if (nWidth == - 1) nWidth = m_pBIH->biWidth; if (nHeight == - 1) nHeight = m_pBIH->biHeight; // 繪制位圖 StretchDIBits(pDC->m_hDC, nX, nY, nWidth, nHeight, 0, 0, m_pBIH->biWidth, m_pBIH->biHeight, m_pDibBits, (BITMAPINFO*)m_pBIH, BI_RGB, mode); return (TRUE); } //函數(shù)功能:設(shè)置調(diào)色板 BOOL CDib::SetPalette(CDC *pDC) { if (m_pDib == NULL) return (FALSE); // 檢查當前是否有一個調(diào)色板句柄,對于大于256色的位圖,為NULL if (m_Palette.GetSafeHandle() == NULL) return (TRUE); // 選擇調(diào)色板,接著實施之,最后恢復老的調(diào)色板 CPalette *pOldPalette; pOldPalette = pDC->SelectPalette(&m_Palette, FALSE); pDC->RealizePalette(); pDC->SelectPalette(pOldPalette, FALSE); return (TRUE); } |
m_hBitmap = ::CreateDIBSection(pDC->GetSafeHdc(), (LPBITMAPINFO) m_lpBMPHdr, DIB_RGB_COLORS, (LPVOID*) &m_lpDIBits, NULL, 0); |
HBITMAP m_hBitmap; |
void CBitMapExampleDlg::OnOpendibpic() { // 彈出文件對話框,讓用戶選擇位圖文件 CFileDialog fileDialog(TRUE, "*.BMP", NULL, NULL,"位圖文件(*.BMP)|*.bmp;*.BMP|"); if (IDOK == fileDialog.DoModal()) { // 加載位圖并顯示之 CDib dib; if (dib.Load(fileDialog.GetPathName())) { CClientDC dc(this); dib.SetPalette(&dc); dib.Draw(&dc); } } } |
void CBitMapExampleDlg::OnMarkDibpic() { // 彈出文件對話框,讓用戶選擇標記logo CFileDialog fileDialog(TRUE, "*.BMP", NULL, NULL, "標記位圖文件(*.BMP)|*.bmp;*.BMP|"); if (IDOK == fileDialog.DoModal()) { // 加載標記logo位圖并與目標位圖相與 CDib dib; if (dib.Load(fileDialog.GetPathName())) { CClientDC dc(this); dib.SetPalette(&dc); dib.Draw(&dc, 0, 0, - 1, - 1, SRCAND); } } } |
![]() 圖4 在DIB位圖中加入天極網(wǎng)logo |