下面首先用图形来说明要做的事情：左图是文本和图形，中间是被镶嵌的位图，右边是镶嵌后的结果。
Emboss()函数的基本思路非常简单：首先创建一个单色位图，其代表需要高亮的边界，然后，创建另外一个边界的需要阴影的单色位图。这样，这两个位图用来绘制高亮和阴影。参见下面的代码。
//prototype for default arguments - include this in your header file HBITMAP Emboss( HBITMAP hBitmap, HBITMAP hbmBackGnd, HPALETTE hPal, BOOL bRaised = TRUE, int xDest = 0, int yDest = 0, COLORREF clrHighlight = GetSysColor( COLOR_BTNHIGHLIGHT ), COLORREF clrShadow = GetSysColor( COLOR_BTNSHADOW )); /////////////////////////////////////////////////////////////////////////////////// // Emboss - Creates a 3D embossed effect // Returns - A new bitmap containing the resulting effect // hBitmap - Bitmap that contains the basic text & shapes // hbmBackGnd - Contains the color image // hPal - Handle of palette associated with hbmBackGnd // bRaised - True if raised effect is desired. False for sunken effect // xDest - x coordinate - used to offset hBitmap // yDest - y coordinate - used to offset hBitmap // clrHightlight - Color used for the highlight edge // clrShadow - Color used for the shadow // // Note - 1. Neither of the bitmap handles passed in should be selected // in a device context. // 2. The pixel at 0,0 in hBitmap is considered the background color // HBITMAP Emboss( HBITMAP hBitmap, HBITMAP hbmBackGnd, HPALETTE hPal, BOOL bRaised, int xDest, int yDest, COLORREF clrHighlight, COLORREF clrShadow ) { const DWORD PSDPxax = 0x00B8074A; BITMAP bmInfo ; HBITMAP hbmOld, hbmShadow, hbmHighlight, hbmResult, hbmOldMem ; HBRUSH hbrPat ; HDC hDC, hColorDC, hMonoDC, hMemDC ; if( !bRaised ) { // Swap the highlight and shadow color COLORREF clrTemp = clrShadow; clrShadow = clrHighlight; clrHighlight = clrTemp; } // We create two monochrome bitmaps. One of them will contain the // highlighted edge and the other will contain the shadow. These // bitmaps are then used to paint the highlight and shadow on the // background image. hbmResult = NULL ; hDC = GetDC( NULL ) ; // Create a compatible DCs hMemDC = ::CreateCompatibleDC( hDC ); hMonoDC = CreateCompatibleDC( hDC ); hColorDC = CreateCompatibleDC( hDC ); if( hMemDC == NULL || hMonoDC == NULL || hColorDC == NULL ) { if( hMemDC ) DeleteDC( hMemDC ); if( hMonoDC ) DeleteDC( hMonoDC ); if( hColorDC ) DeleteDC( hColorDC ); return NULL; } // Select the background image into memory DC so that we can draw it hbmOldMem = (HBITMAP)::SelectObject( hMemDC, hbmBackGnd ); // Get dimensions of the background image BITMAP bm; ::GetObject( hbmBackGnd, sizeof( bm ), &bm ); // Create the monochrome and compatible color bitmaps GetObject( hBitmap, sizeof( BITMAP ), (LPSTR) &bmInfo ) ; hbmShadow = CreateBitmap( bmInfo.bmWidth, bmInfo.bmHeight, 1, 1, NULL ) ; hbmHighlight = CreateBitmap( bmInfo.bmWidth, bmInfo.bmHeight, 1, 1, NULL ) ; hbmResult = CreateCompatibleBitmap( hDC, bm.bmWidth, bm.bmHeight ) ; hbmOld = (HBITMAP)SelectObject( hColorDC, hBitmap ) ; // Set background color of bitmap for mono conversion // We assume that the pixel in the top left corner has the background color SetBkColor( hColorDC, GetPixel( hColorDC, 0, 0 ) ) ; // Create the highlight bitmap. hbmHighlight = (HBITMAP)SelectObject( hMonoDC, (HGDIOBJ) hbmHighlight ) ; PatBlt( hMonoDC, 0, 0, bmInfo.bmWidth, bmInfo.bmHeight, WHITENESS ) ; BitBlt( hMonoDC, 0, 0, bmInfo.bmWidth - 1, bmInfo.bmHeight - 1, hColorDC, 1, 1, SRCCOPY ) ; BitBlt( hMonoDC, 0, 0, bmInfo.bmWidth, bmInfo.bmHeight, hColorDC, 0, 0, MERGEPAINT ) ; hbmHighlight = (HBITMAP)SelectObject( hMonoDC, (HGDIOBJ) hbmHighlight ) ; // create the shadow bitmap hbmShadow = (HBITMAP)SelectObject( hMonoDC, (HGDIOBJ) hbmShadow ) ; PatBlt( hMonoDC, 0, 0, bmInfo.bmWidth, bmInfo.bmHeight, WHITENESS ) ; BitBlt( hMonoDC, 1, 1, bmInfo.bmWidth-1, bmInfo.bmHeight-1, hColorDC, 0, 0, SRCCOPY ) ; BitBlt( hMonoDC, 0, 0, bmInfo.bmWidth, bmInfo.bmHeight, hColorDC, 0, 0, MERGEPAINT ) ; hbmShadow = (HBITMAP)SelectObject( hMonoDC, (HGDIOBJ) hbmShadow ) ; // Now let's start working on the final image SelectObject( hColorDC, hbmResult ) ; // Select and realize the palette if one is supplied if( hPal && GetDeviceCaps(hDC, RASTERCAPS) & RC_PALETTE ) { ::SelectPalette( hColorDC, hPal, FALSE ); ::RealizePalette(hColorDC); } // Draw the background image BitBlt(hColorDC, 0, 0, bm.bmWidth, bm.bmHeight, hMemDC, 0, 0,SRCCOPY); // Restore the old bitmap in the hMemDC ::SelectObject( hMemDC, hbmOldMem ); // Set the background and foreground color for the raster operations SetBkColor( hColorDC, RGB(255,255,255) ) ; SetTextColor( hColorDC, RGB(0,0,0) ) ; // blt the highlight edge hbrPat = CreateSolidBrush( clrHighlight ) ; hbrPat = (HBRUSH)SelectObject( hColorDC, hbrPat ) ; hbmHighlight = (HBITMAP)SelectObject( hMonoDC, (HGDIOBJ) hbmHighlight ) ; BitBlt( hColorDC, xDest, yDest, bmInfo.bmWidth, bmInfo.bmHeight, hMonoDC, 0, 0, PSDPxax ) ; DeleteObject( SelectObject( hColorDC, hbrPat ) ) ; hbmHighlight = (HBITMAP)SelectObject( hMonoDC, (HGDIOBJ) hbmHighlight ) ; // blt the shadow edge hbrPat = CreateSolidBrush( clrShadow ) ; hbrPat = (HBRUSH)SelectObject( hColorDC, hbrPat ) ; hbmShadow = (HBITMAP)SelectObject( hMonoDC, (HGDIOBJ) hbmShadow ) ; BitBlt( hColorDC, xDest, yDest, bmInfo.bmWidth, bmInfo.bmHeight, hMonoDC, 0, 0, PSDPxax ) ; DeleteObject( SelectObject( hColorDC, hbrPat ) ) ; hbmShadow = (HBITMAP)SelectObject( hMonoDC, (HGDIOBJ) hbmShadow ) ; // select old bitmap into color DC SelectObject( hColorDC, hbmOld ) ; DeleteObject( (HGDIOBJ) hbmShadow ) ; DeleteObject( (HGDIOBJ) hbmHighlight ) ; ReleaseDC( NULL, hDC ) ; return ( hbmResult ) ; }
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