1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 2<HTML> 3<HEAD> 4<META http-equiv="Content-Type" content="text/html; charset=windows-1252"> 5<META name="GENERATOR" content="IBM WebSphere Studio Homepage Builder Version 7.0.0.0 for Windows"> 6<META http-equiv="Content-Style-Type" content="text/css"> 7<TITLE>CAMERA_I2CContextSwitch*</TITLE> 8<LINK rel="stylesheet" href="../css/nitro.css" type="text/css"> 9</HEAD> 10<BODY> 11<H1 align="left">CAMERA_I2CContextSwitch* <IMG src="../image/TWL.gif" align="middle"></H1> 12<H2>Syntax</H2> 13<DL> 14 <DD> 15<CODE>#include <twl/camera.h></CODE><BR> <BR> <CODE><A href="CAMERAResult.html">CAMERAResult</A> CAMERA_I2CContextSwitch(<A href="CAMERASelect.html">CAMERASelect</A> camera, <A href="CAMERAContext.html">CAMERAContext</A> context);</CODE> <BR> <CODE><A href="CAMERAResult.html">CAMERAResult</A> CAMERA_I2CContextSwitchAsync(<A href="CAMERASelect.html">CAMERASelect</A> camera, <A href="CAMERAContext.html">CAMERAContext</A> context, <A href="CAMERACallback.html">CAMERACallback</A> callback, void *arg);</CODE> 16</DL> 17<H2>Arguments</H2> 18<TABLE border="1" width="100%"> 19 <TBODY> 20 <TR> 21<TD width="13%"><EM><STRONG>camera</STRONG></EM></TD> 22<TD width="87%">Camera to change the context for (<CODE>CAMERA_SELECT_IN</CODE> or <CODE>CAMERA_SELECT_OUT</CODE>).</TD> 23 </TR> 24 <TR> 25<TD width="13%"><EM><STRONG>context</STRONG></EM></TD> 26<TD width="87%">Context to change.</TD> 27 </TR> 28 <TR> 29<TD width="13%"><EM><STRONG>callback</STRONG></EM></TD> 30<TD width="87%">Function that is called when asynchronous processing has completed.</TD> 31 </TR> 32 <TR> 33<TD width="13%"><EM><STRONG>arg</STRONG></EM></TD> 34<TD width="87%">Arguments when the callback function is invoked.</TD> 35 </TR> 36 </TBODY> 37</TABLE> 38 39<H2>Return Values</H2> 40<P>Returns <CODE>CAMERA_RESULT_SUCCESS</CODE> if changes were possible.</P> 41 42<H2>Description</H2> 43<P> 44Switches the camera settings context. It is faster to switch the context than to configure settings individually.<BR><BR> When you switch the settings for the specified camera and the specified context (A or B), you cannot set <SPAN class="argument">camera</SPAN> to <CODE>CAMERA_SELECT_NONE</CODE> or <SPAN class="argument">context</SPAN> to <CODE>CAMERA_CONTEXT_BOTH</CODE>.<BR> <BR> Unlike <code>CAMERA_I2CContextSwitch</code>, the <code>CAMERA_I2CContextSwitchAsync</code> function returns control immediately and runs asynchronously. Use <SPAN class="argument">callback</SPAN> to confirm that processing has completed.<br><br> <font color="red"><B>Note:</B></font><br> If camera settings are changed using any of the <code>CAMERA_I2C*</code> functions, the changes may be delayed for approximately one frame before they are applied. Consequently, note that if camera settings are changed while capturing, the application may not be able to get an updated image (an image with changes applied) at the time the application intended. 45</P> 46 47<H2>See Also</H2> 48<P><A href="CAMERASelect.html"><CODE>CAMERASelect</CODE></A><BR> <A href="CAMERAContext.html"><CODE>CAMERAContext</CODE></A><BR> <A href="CAMERACallback.html"><CODE>CAMERACallback</CODE></A><BR> <A href="CAMERAResult.html"><CODE>CAMERAResult</CODE></A></P> 49<H2>Revision History</H2> 50<P> 512009/03/25 Added a note on changes to camera settings during capture operations. <br>2007/10/12 Initial version.</P> 52<hr><p>CONFIDENTIAL</p></body> 53</HTML> 54
