这段代码什么意思？
各位大虾这段代码是什么意思？特别是CreateCompatibleDC，BitBlt，SelectObject的用途
procedure TMRunScreen.DrawTextBitmap;
var
hDC, hCompDC, hOldHandle:THandle;
begin
hDC := GetDC(Handle);
hCompDC := CreateCompatibleDC(hDC);
hOldHandle := SelectObject( hCompDC, TitleBitmap.Handle );
BitBlt( hDC,0,0,Width,Height,hCompDC,0,0,SRCCOPY );
SelectObject( hCompDC, hOldHandle );
ReleaseDC(handle,hDC);
DeleteDC(hCompDC);
end;
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