文件名称:
透明的对话框transparent_dialog.rar
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文件大小: 136kb
下载次数: 0
上传时间: 2008-11-18
详细说明: 透明的对话框 void TransparentBlt( HDC hdcDest, int nXDest, int nYDest, int nWidth, int nHeight, HBITMAP hBitmap, int nXSrc, int nYSrc, COLORREF colorTransparent, HPALETTE hPal ) { CDC dc, memDC, maskDC, tempDC; dc.Attach( hdcDest ); maskDC.CreateCompatibleDC(&dc); CBitmap maskBitmap; //add these to store return of SelectObject() calls CBitmap* pOldMemBmp = NULL; CBitmap* pOldMaskBmp = NULL; HBITMAP hOldTempBmp = NULL; memDC.CreateCompatibleDC(&dc); tempDC.CreateCompatibleDC(&dc); CBitmap bmpImage; bm pImage.CreateCompatibleBitmap( &dc, nWidth, nHeight ); pOldMemBmp = memDC.SelectObject( &bmpImage ); // Select and realize the palette if( dc.GetDeviceCaps(RASTERCAPS) & RC_PALETTE && hPal ) { ::SelectPalette( dc, hPal, FALSE ); dc.RealizePalette(); ::SelectPalette( memDC, hPal, FALSE ); } hOldTempBmp = (HBITMAP) ::SelectObject( tempDC.m_hDC, hBitmap ); memDC.BitBlt( 0,0,nWidth, nHeight, &tempDC, nXSrc, nYSrc, SRCCOPY ); // Create monochrome bitmap for the mask maskBitmap.CreateBitmap( nWidth, nHeight, 1, 1, NULL ); pOldMaskBmp = maskDC.SelectObject( &maskBitmap ); memDC.SetBkColor( colorTransparent ); // Create the mask from the memory DC maskDC.BitBlt( 0, 0, nWidth, nHeight, &memDC, 0, 0, SRCCOPY ); // Set the background in memDC to black. Using SRCPAINT with black // and any other color results in the other color, thus making // black the transparent color memDC.SetBkColor(RGB(0,0,0)); memDC.SetTextColor(RGB(255,255,255)); memDC.BitBlt(0, 0, nWidth, nHeight, &maskDC, 0, 0, SRCAND); // Set the foreground to black. See comment above. dc.SetBkColor(RGB(255,255,255)); dc.SetTextColor(RGB(0,0,0)); dc.BitBlt(nXDest, nYDest, nWidth, nHeight, &maskDC, 0, 0, SRCAND); // Combine the foreground with the background dc.BitBlt(nXDest, nYDest, nWidth, nHeight, &memDC, 0, 0, SRCPAINT); if (hOldTempBmp) ::SelectObject( tempDC.m_hDC, hOldTempBmp); if (pOldMaskBmp) maskDC.SelectObject( pOldMaskBmp ); if (pOldMemBmp) memDC.SelectObject( pOldMemBmp ); dc.Detach(); } ...展开收缩
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