?? idirectfbdisplaylayer_getcurrentoutputfield.html
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<HTML><STYLE> <!-- A{textdecoration:none} --></STYLE><STYLE type="text/css"> A:link, A:visited, A:active { text-decoration: none; }</STYLE><HEAD> <TITLE>IDirectFBDisplayLayer - GetCurrentOutputField [DirectFB Reference Manual]</TITLE></HEAD><BODY bgcolor=#FFFFFF link=#0070FF vlink=#0070FF text=#404040><TABLE width=100% bgcolor=black border=0 cellspacing=1 cellpadding=3> <TR><TD width=30%> <A href="http://www.directfb.org"><IMG border=0 src="directfb.png"></A> </TD><TD align=right> <A href="index.html"><FONT size=+3 color=white>Reference Manual - 0.9.25</FONT></A> </TD></TR> <TR><TD colspan=2 align=center bgcolor=#303030> <TABLE border=0 cellspacing=0 cellpadding=0> <TR><TD nowrap align=right width=50%> <BIG><A href="IDirectFBDisplayLayer.html"><FONT color=#DDDDDD>IDirectFBDisplayLayer</FONT></A> </BIG> </TD><TD nowrap align=left width=50%> <BIG><FONT color=orange> GetCurrentOutputField</FONT></BIG> </TD></TR> </TABLE> </TD></TR></TABLE><P> For an interlaced display, this returns the currently inactive field: 0 for the top field, and 1 for the bottom field.</P><P> <TABLE border=0 cellspacing=0 cellpadding=2 bgcolor=#C0C0C0> <TR><TD colspan=5><I><FONT color=black>GetCurrentOutputField (</FONT></I></TD></TR> <TR><TD width=50> </TD><TD valign=top> <A href="IDirectFBDisplayLayer.html">IDirectFBDisplayLayer</A> </TD><TD width=20> </TD><TD align=right> <FONT color=black><B>*</B></FONT> </TD><TD valign=top> <FONT color=black><B>thiz,</B></FONT> </TD></TR> <TR><TD width=50> </TD><TD valign=top> int </TD><TD width=20> </TD><TD align=right> <FONT color=black><B>*</B></FONT> </TD><TD valign=top> <FONT color=black><B>ret_field</B></FONT> </TD></TR> <TR><TD colspan=3><I><FONT color=black>);</FONT></I></TD></TR> </TABLE></P><P> The inactive field is the one you should draw to next to avoid tearing, the active field is the one currently being displayed. </P><P> For a progressive output, this should always return 0. We should also have some other call to indicate whether the display layer is interlaced or progressive, but this is a start.</P></BODY></HTML>?? 快捷鍵說(shuō)明
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