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<HTML><HEAD><TITLE>SDL_UpdateRect</TITLE><METANAME="GENERATOR"CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+"><LINKREL="HOME"TITLE="SDL Library Documentation"HREF="index.html"><LINKREL="UP"TITLE="Video"HREF="video.html"><LINKREL="PREVIOUS"TITLE="SDL_SetVideoMode"HREF="sdlsetvideomode.html"><LINKREL="NEXT"TITLE="SDL_UpdateRects"HREF="sdlupdaterects.html"></HEAD><BODYCLASS="REFENTRY"BGCOLOR="#FFF8DC"TEXT="#000000"LINK="#0000ee"VLINK="#551a8b"ALINK="#ff0000"><DIVCLASS="NAVHEADER"><TABLESUMMARY="Header navigation table"WIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><THCOLSPAN="3"ALIGN="center">SDL Library Documentation</TH></TR><TR><TDWIDTH="10%"ALIGN="left"VALIGN="bottom"><AHREF="sdlsetvideomode.html"ACCESSKEY="P">Prev</A></TD><TDWIDTH="80%"ALIGN="center"VALIGN="bottom"></TD><TDWIDTH="10%"ALIGN="right"VALIGN="bottom"><AHREF="sdlupdaterects.html"ACCESSKEY="N">Next</A></TD></TR></TABLE><HRALIGN="LEFT"WIDTH="100%"></DIV><H1><ANAME="SDLUPDATERECT"></A>SDL_UpdateRect</H1><DIVCLASS="REFNAMEDIV"><ANAME="AEN1355"></A><H2>Name</H2>SDL_UpdateRect -- Makes sure the given area is updated on the given screen.</DIV><DIVCLASS="REFSYNOPSISDIV"><ANAME="AEN1358"></A><H2>Synopsis</H2><DIVCLASS="FUNCSYNOPSIS"><ANAME="AEN1359"></A><P></P><PRECLASS="FUNCSYNOPSISINFO">#include "SDL.h"</PRE><P><CODE><CODECLASS="FUNCDEF">void <BCLASS="FSFUNC">SDL_UpdateRect</B></CODE>(SDL_Surface *screen, Sint32 x, Sint32 y, Sint32 w, Sint32 h);</CODE></P><P></P></DIV></DIV><DIVCLASS="REFSECT1"><ANAME="AEN1365"></A><H2>Description</H2><P>Makes sure the given area is updated on the given screen. The rectangle mustbe confined within the screen boundaries (no clipping is done).</P><P>If '<TTCLASS="PARAMETER"><I>x</I></TT>', '<TTCLASS="PARAMETER"><I>y</I></TT>', '<TTCLASS="PARAMETER"><I>w</I></TT>'and '<TTCLASS="PARAMETER"><I>h</I></TT>' are all 0,<TTCLASS="FUNCTION">SDL_UpdateRect</TT> will update theentire screen.</P><P>This function should not be called while '<TTCLASS="PARAMETER"><I>screen</I></TT>' is<AHREF="sdllocksurface.html">locked</A>.</P></DIV><DIVCLASS="REFSECT1"><ANAME="AEN1377"></A><H2>See Also</H2><P><AHREF="sdlupdaterects.html"><TTCLASS="FUNCTION">SDL_UpdateRects</TT></A>,<AHREF="sdlrect.html"><SPANCLASS="STRUCTNAME">SDL_Rect</SPAN></A>,<AHREF="sdlsurface.html"><SPANCLASS="STRUCTNAME">SDL_Surface</SPAN></A>,<AHREF="sdllocksurface.html"><TTCLASS="FUNCTION">SDL_LockSurface</TT></A></P></DIV><DIVCLASS="NAVFOOTER"><HRALIGN="LEFT"WIDTH="100%"><TABLESUMMARY="Footer navigation table"WIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top"><AHREF="sdlsetvideomode.html"ACCESSKEY="P">Prev</A></TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="index.html"ACCESSKEY="H">Home</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top"><AHREF="sdlupdaterects.html"ACCESSKEY="N">Next</A></TD></TR><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top">SDL_SetVideoMode</TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="video.html"ACCESSKEY="U">Up</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top">SDL_UpdateRects</TD></TR></TABLE></DIV></BODY></HTML>⌨️ 快捷键说明
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