- TransparentBlt函数
BOOL TransparentBlt( HDC hdcDest, // handle to destination DC int nXOriginDest, // x-coord of destination upper-left corner int nYOriginDest, // y-coord of destination upper-left corner int nWidthDest, // width of destination rectangle int hHeightDest, // height of destination rectangle HDC hdcSrc, // handle to source DC int nXOriginSrc, // x-coord of source upper-left corner int nYOriginSrc, // y-coord of source upper-left corner int nWidthSrc, // width of source rectangle int nHeightSrc, // height of source rectangle UINT crTransparent // color to make transparent - 示例
static HBITMAP hBmp; static int cxBmp; static int cyBmp; case WM_CREATE: { //load bmp and get bmp info hBmp = LoadBitmap(GetModuleHandle(NULL),MAKEINTRESOURCE(IDB_BALL)); BITMAP bmpInfo; GetObject(hBmp,sizeof(BITMAP),&bmpInfo); cxBmp = bmpInfo.bmWidth; cyBmp = bmpInfo.bmHeight; //put window int the middle screen int cxScr = GetSystemMetrics(SM_CXSCREEN); int cyScr = GetSystemMetrics(SM_CYSCREEN); int cxWnd = 400; int cyWnd = 400; MoveWindow(hWnd,(cxScr-cxWnd)/2,(cyScr-cyWnd)/2,cxWnd,cyWnd,TRUE); } break; case WM_PAINT: hdc = BeginPaint(hWnd, &ps); { //bg color RECT rcWnd; HBRUSH hBrush; GetClientRect(hWnd,&rcWnd); hBrush = CreateSolidBrush(RGB(0,128,128)); FillRect(hdc,&rcWnd,hBrush); DeleteObject(hBrush); //disp bmp HDC hMemDC = CreateCompatibleDC(hdc); HBITMAP hOldBmp = (HBITMAP)SelectObject(hMemDC,hBmp); //BitBlt(hdc,73,58,cxBmp,cyBmp,hMemDC,0,0,SRCCOPY); TransparentBlt(hdc,73,58,cxBmp,cyBmp,hMemDC,0,0,cxBmp,cyBmp,RGB(255,255,255)); SelectObject(hMemDC,hOldBmp); DeleteDC(hMemDC); } EndPaint(hWnd, &ps); break; - 结果
- BitBlt:
- TransparentBlt:
转载于:https://www.cnblogs.com/dahai/archive/2011/07/09/2101645.html
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