Mercurial > sdl-ios-xcode

annotate docs/html/sdlpumpevents.html @ 3880:74e828c64315 SDL-1.2

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Fixed bug #292 I might be on crack here. It looks like SDL_ConvertMono() in src/audio/SDL_audiocvt.c adds the left and right channels of a stereo stream together, and clamps the new mono channel if it would overflow. Shouldn't it be dividing by 2 to average the two sample points instead of clamping? Otherwise the mono sample point's volume doubles in the conversion. This would also make the conversion faster, as it replaces two branches per sample frame with a bitwise shift. --ryan.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 24 Sep 2006 15:45:37 +0000
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1 <HTML
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2 ><HEAD
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3 ><TITLE
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4 >SDL_PumpEvents</TITLE
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5 ><META
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6 NAME="GENERATOR"
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7 CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+
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8 "><LINK
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9 REL="HOME"
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10 TITLE="SDL Library Documentation"
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11 HREF="index.html"><LINK
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12 REL="UP"
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13 TITLE="Event Functions."
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14 HREF="eventfunctions.html"><LINK
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15 REL="PREVIOUS"
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16 TITLE="Event Functions."
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17 HREF="eventfunctions.html"><LINK
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18 REL="NEXT"
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19 TITLE="SDL_PeepEvents"
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20 HREF="sdlpeepevents.html"></HEAD
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24 TEXT="#000000"
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25 LINK="#0000ee"
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30 ><TABLE
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31 SUMMARY="Header navigation table"
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33 BORDER="0"
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35 CELLSPACING="0"
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36 ><TR
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37 ><TH
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38 COLSPAN="3"
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39 ALIGN="center"
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40 >SDL Library Documentation</TH
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41 ></TR
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42 ><TR
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44 WIDTH="10%"
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46 VALIGN="bottom"
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47 ><A
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48 HREF="eventfunctions.html"
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49 ACCESSKEY="P"
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50 >Prev</A
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51 ></TD
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52 ><TD
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55 VALIGN="bottom"
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56 ></TD
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57 ><TD
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58 WIDTH="10%"
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60 VALIGN="bottom"
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61 ><A
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62 HREF="sdlpeepevents.html"
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63 ACCESSKEY="N"
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64 >Next</A
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65 ></TD
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66 ></TR
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67 ></TABLE
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70 WIDTH="100%"></DIV
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71 ><H1
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72 ><A
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73 NAME="SDLPUMPEVENTS"
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74 ></A
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75 >SDL_PumpEvents</H1
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76 ><DIV
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77 CLASS="REFNAMEDIV"
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78 ><A
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79 NAME="AEN5387"
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80 ></A
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81 ><H2
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82 >Name</H2
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83 >SDL_PumpEvents&nbsp;--&nbsp;Pumps the event loop, gathering events from the input devices.</DIV
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84 ><DIV
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85 CLASS="REFSYNOPSISDIV"
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86 ><A
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87 NAME="AEN5390"
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88 ></A
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89 ><H2
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90 >Synopsis</H2
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91 ><DIV
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92 CLASS="FUNCSYNOPSIS"
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93 ><A
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94 NAME="AEN5391"
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95 ></A
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96 ><P
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97 ></P
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98 ><PRE
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99 CLASS="FUNCSYNOPSISINFO"
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100 >#include "SDL.h"</PRE
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101 ><P
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102 ><CODE
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103 ><CODE
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104 CLASS="FUNCDEF"
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105 >void <B
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106 CLASS="FSFUNC"
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107 >SDL_PumpEvents</B
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108 ></CODE
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109 >(void);</CODE
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110 ></P
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111 ><P
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112 ></P
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113 ></DIV
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114 ></DIV
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115 ><DIV
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116 CLASS="REFSECT1"
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117 ><A
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118 NAME="AEN5397"
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119 ></A
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120 ><H2
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121 >Description</H2
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122 ><P
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123 >Pumps the event loop, gathering events from the input devices.</P
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124 ><P
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125 ><TT
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126 CLASS="FUNCTION"
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127 >SDL_PumpEvents</TT
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128 > gathers all the pending input information from devices and places it on the event queue. Without calls to <TT
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129 CLASS="FUNCTION"
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130 >SDL_PumpEvents</TT
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131 > no events would ever be placed on the queue. Often calls the need for <TT
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132 CLASS="FUNCTION"
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133 >SDL_PumpEvents</TT
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134 > is hidden from the user since <A
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135 HREF="sdlpollevent.html"
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136 ><TT
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137 CLASS="FUNCTION"
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138 >SDL_PollEvent</TT
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139 ></A
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140 > and <A
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141 HREF="sdlwaitevent.html"
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142 ><TT
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143 CLASS="FUNCTION"
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144 >SDL_WaitEvent</TT
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145 ></A
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146 > implicitly call <TT
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147 CLASS="FUNCTION"
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148 >SDL_PumpEvents</TT
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149 >. However, if you are not polling or waiting for events (e.g. you are filtering them), then you must call <TT
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150 CLASS="FUNCTION"
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151 >SDL_PumpEvents</TT
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152 > to force an event queue update.</P
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153 ><DIV
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154 CLASS="NOTE"
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155 ><BLOCKQUOTE
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156 CLASS="NOTE"
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157 ><P
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158 ><B
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159 >Note: </B
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160 >You can only call this function in the thread that set the video mode.</P
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161 ></BLOCKQUOTE
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162 ></DIV
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163 ></DIV
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164 ><DIV
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165 CLASS="REFSECT1"
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166 ><A
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167 NAME="AEN5412"
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168 ></A
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169 ><H2
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170 >See Also</H2
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171 ><P
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172 ><A
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173 HREF="sdlpollevent.html"
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174 ><TT
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175 CLASS="FUNCTION"
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176 >SDL_PollEvent</TT
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177 ></A
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178 ></P
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179 ></DIV
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180 ><DIV
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181 CLASS="NAVFOOTER"
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182 ><HR
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183 ALIGN="LEFT"
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184 WIDTH="100%"><TABLE
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185 SUMMARY="Footer navigation table"
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186 WIDTH="100%"
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187 BORDER="0"
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188 CELLPADDING="0"
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189 CELLSPACING="0"
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190 ><TR
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191 ><TD
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192 WIDTH="33%"
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193 ALIGN="left"
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194 VALIGN="top"
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195 ><A
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196 HREF="eventfunctions.html"
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197 ACCESSKEY="P"
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198 >Prev</A
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199 ></TD
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200 ><TD
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201 WIDTH="34%"
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202 ALIGN="center"
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203 VALIGN="top"
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204 ><A
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205 HREF="index.html"
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206 ACCESSKEY="H"
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207 >Home</A
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208 ></TD
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209 ><TD
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210 WIDTH="33%"
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211 ALIGN="right"
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212 VALIGN="top"
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213 ><A
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214 HREF="sdlpeepevents.html"
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215 ACCESSKEY="N"
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216 >Next</A
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217 ></TD
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218 ></TR
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219 ><TR
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220 ><TD
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221 WIDTH="33%"
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222 ALIGN="left"
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223 VALIGN="top"
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224 >Event Functions.</TD
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225 ><TD
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226 WIDTH="34%"
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227 ALIGN="center"
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228 VALIGN="top"
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229 ><A
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230 HREF="eventfunctions.html"
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231 ACCESSKEY="U"
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232 >Up</A
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233 ></TD
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234 ><TD
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235 WIDTH="33%"
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236 ALIGN="right"
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237 VALIGN="top"
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238 >SDL_PeepEvents</TD
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239 ></TR
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240 ></TABLE
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241 ></DIV
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242 ></BODY
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243 ></HTML
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244 >