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BITMAP m_bm;
COLORREF cColor;
// ¡§¡ÀDC
HDC hMem, hBack, hObject, hTemp, hSave;
hBack = CreateCompatibleDC(hdc);
hObject = CreateCompatibleDC(hdc);
hMem = CreateCompatibleDC(hdc);
hSave = CreateCompatibleDC(hdc);
hTemp = CreateCompatibleDC(hdc);
//
SelectObject(hTemp, hBitmap);
GetObject(hBitmap, sizeof(BITMAP), (LPSTR)&m_bm);
//¨ª
POINT ptSize;
// ¨ª
ptSize.x = m_bm.bmWidth;
//
ptSize.y = m_bm.bmHeight;
// ¡Á
DPtoLP(hTemp, &ptSize, 1);
// ¡§¡À
HBITMAP bmBack, bmObject, bmMem, bmSave;
//
bmBack = CreateBitmap(ptSize.x, ptSize.y, 1, 1, NULL);
bmObject = CreateBitmap(ptSize.x, ptSize.y, 1, 1, NULL);
// ¨¨¡À
bmMem = CreateCompatibleBitmap(hdc, ptSize.x, ptSize.y);
bmSave = CreateCompatibleBitmap(hdc, ptSize.x, ptSize.y);
// ¡§¡À¡ÀDC
HBITMAP OldbmBack, OldbmObject, OldbmMem, OldbmSave;
OldbmBack = (HBITMAP)SelectObject(hBack, bmBack);
OldbmObject = (HBITMAP)SelectObject(hObject, bmObject);
OldbmMem = (HBITMAP)SelectObject(hMem, bmMem);
OldbmSave = (HBITMAP)SelectObject(hSave, bmSave); // ¨¨
SetMapMode(hTemp, GetMapMode(hdc)); // ¡À
BitBlt(hSave, 0, 0, ptSize.x, ptSize.y, hTemp, 0, 0, SRCCOPY); // ¡À¡ã¨¨¨¨¡Â
cColor = SetBkColor(hTemp, cTransparentColor); // ¡§¡À¨º¡À
BitBlt(hObject, 0, 0, ptSize.x, ptSize.y, hTemp, 0, 0, SRCCOPY); // DC¡À¡ã
SetBkColor(hTemp, cColor); // ¡§¡¤¡Á¡À¨º¡À
BitBlt(hBack, 0, 0, ptSize.x, ptSize.y, hObject, 0, 0, NOTSRCCOPY);
// ¡À¡ÂDC¡À¡ã¡À¨ºDC
BitBlt(hMem, 0, 0, ptSize.x, ptSize.y, hdc, xStart, yStart, SRCCOPY);
// ¡À
BitBlt(hMem, 0, 0, ptSize.x, ptSize.y, hObject, 0, 0, SRCAND);
// ¡À¡Â
BitBlt(hTemp, 0, 0, ptSize.x, ptSize.y, hBack, 0, 0, SRCAND);
// ¡À¨ºDC¡À¡ã¡Á¨®¨¬¨°¡Á¡Â
BitBlt(hMem, 0, 0, ptSize.x, ptSize.y, hTemp, 0, 0, SRCPAINT);
// ¡À¡À¨º
StretchBlt(hdc, xStart, yStart, ptSize.x+xadd, ptSize.y+yadd, hMem, 0, 0, ptSize.x, ptSize.y,SRCCOPY);
//
BitBlt(hTemp, 0, 0, ptSize.x, ptSize.y, hSave, 0, 0, SRCCOPY);
// ¡À
DeleteObject(SelectObject(hBack, OldbmBack));
DeleteObject(SelectObject(hObject, OldbmObject));
DeleteObject(SelectObject(hMem, OldbmMem));
DeleteObject(SelectObject(hSave, OldbmSave));
// ¡ÀDC
DeleteDC(hMem);
DeleteDC(hBack);
DeleteDC(hObject);
DeleteDC(hSave);
DeleteDC(hTemp);