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annotate docs/html/sdllockyuvoverlay.html @ 4355:9b464226e541 SDL-1.2

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Fixed bug #855 Ludwig Nussel 2009-10-18 06:31:52 PDT an mprotect call was added to fix bug 528. However that results in a buffer that allows writing and code execution. Ie the no-execute security features of modern operating systems are defeated this way. Two mprotect calls are needed. One to make the buffer executable but not writeable when done and another one to make the buffer writeable again if the content needs to be changed.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 18 Oct 2009 17:31:37 +0000
parents 355632dca928
children
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1 <HTML
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2 ><HEAD
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3 ><TITLE
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4 >SDL_LockYUVOverlay</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="Video"
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14 HREF="video.html"><LINK
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15 REL="PREVIOUS"
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16 TITLE="SDL_CreateYUVOverlay"
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17 HREF="sdlcreateyuvoverlay.html"><LINK
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18 REL="NEXT"
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19 TITLE="SDL_UnlockYUVOverlay"
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20 HREF="sdlunlockyuvoverlay.html"></HEAD
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21 ><BODY
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22 CLASS="REFENTRY"
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23 BGCOLOR="#FFF8DC"
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24 TEXT="#000000"
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25 LINK="#0000ee"
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26 VLINK="#551a8b"
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27 ALINK="#ff0000"
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28 ><DIV
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29 CLASS="NAVHEADER"
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30 ><TABLE
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31 SUMMARY="Header navigation table"
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32 WIDTH="100%"
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33 BORDER="0"
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34 CELLPADDING="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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43 ><TD
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44 WIDTH="10%"
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45 ALIGN="left"
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46 VALIGN="bottom"
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47 ><A
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48 HREF="sdlcreateyuvoverlay.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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53 WIDTH="80%"
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54 ALIGN="center"
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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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59 ALIGN="right"
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60 VALIGN="bottom"
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61 ><A
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62 HREF="sdlunlockyuvoverlay.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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68 ><HR
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69 ALIGN="LEFT"
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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="SDLLOCKYUVOVERLAY"
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74 ></A
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75 >SDL_LockYUVOverlay</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="AEN2844"
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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_LockYUVOverlay&nbsp;--&nbsp;Lock an overlay</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="AEN2847"
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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="AEN2848"
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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 >int <B
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106 CLASS="FSFUNC"
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107 >SDL_LockYUVOverlay</B
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108 ></CODE
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109 >(SDL_Overlay *overlay);</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="AEN2854"
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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 >Much the same as <A
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124 HREF="sdllocksurface.html"
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125 ><TT
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126 CLASS="FUNCTION"
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127 >SDL_LockSurface</TT
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128 ></A
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129 >, <TT
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130 CLASS="FUNCTION"
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131 >SDL_LockYUVOverlay</TT
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132 > locks the <A
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133 HREF="sdloverlay.html"
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134 ><TT
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135 CLASS="PARAMETER"
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136 ><I
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137 >overlay</I
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138 ></TT
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139 ></A
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140 > for direct access to pixel data.</P
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141 ></DIV
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142 ><DIV
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143 CLASS="REFSECT1"
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144 ><A
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145 NAME="AEN2862"
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146 ></A
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147 ><H2
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148 >Return Value</H2
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149 ><P
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150 >Returns <SPAN
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151 CLASS="RETURNVALUE"
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152 >0</SPAN
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153 > on success, or <SPAN
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154 CLASS="RETURNVALUE"
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155 >-1</SPAN
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156 > on an error.</P
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157 ></DIV
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158 ><DIV
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159 CLASS="REFSECT1"
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160 ><A
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161 NAME="AEN2867"
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162 ></A
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163 ><H2
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164 >See Also</H2
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165 ><P
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166 ><A
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167 HREF="sdlunlockyuvoverlay.html"
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168 ><TT
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169 CLASS="FUNCTION"
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170 >SDL_UnlockYUVOverlay</TT
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171 ></A
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172 >,
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173 <A
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174 HREF="sdlcreateyuvoverlay.html"
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175 ><TT
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176 CLASS="FUNCTION"
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177 >SDL_CreateYUVOverlay</TT
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178 ></A
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179 >,
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180 <A
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181 HREF="sdloverlay.html"
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182 ><SPAN
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183 CLASS="STRUCTNAME"
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184 >SDL_Overlay</SPAN
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185 ></A
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186 ></P
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187 ></DIV
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188 ><DIV
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189 CLASS="NAVFOOTER"
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190 ><HR
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191 ALIGN="LEFT"
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192 WIDTH="100%"><TABLE
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193 SUMMARY="Footer navigation table"
0
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194 WIDTH="100%"
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195 BORDER="0"
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196 CELLPADDING="0"
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197 CELLSPACING="0"
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198 ><TR
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199 ><TD
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200 WIDTH="33%"
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201 ALIGN="left"
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202 VALIGN="top"
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203 ><A
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204 HREF="sdlcreateyuvoverlay.html"
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205 ACCESSKEY="P"
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206 >Prev</A
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207 ></TD
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208 ><TD
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209 WIDTH="34%"
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210 ALIGN="center"
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211 VALIGN="top"
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212 ><A
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213 HREF="index.html"
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214 ACCESSKEY="H"
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215 >Home</A
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216 ></TD
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217 ><TD
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218 WIDTH="33%"
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219 ALIGN="right"
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220 VALIGN="top"
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221 ><A
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222 HREF="sdlunlockyuvoverlay.html"
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223 ACCESSKEY="N"
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224 >Next</A
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225 ></TD
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226 ></TR
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227 ><TR
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228 ><TD
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229 WIDTH="33%"
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230 ALIGN="left"
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231 VALIGN="top"
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232 >SDL_CreateYUVOverlay</TD
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233 ><TD
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234 WIDTH="34%"
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235 ALIGN="center"
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236 VALIGN="top"
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237 ><A
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238 HREF="video.html"
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239 ACCESSKEY="U"
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240 >Up</A
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241 ></TD
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242 ><TD
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243 WIDTH="33%"
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244 ALIGN="right"
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245 VALIGN="top"
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246 >SDL_UnlockYUVOverlay</TD
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247 ></TR
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248 ></TABLE
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249 ></DIV
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250 ></BODY
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251 ></HTML
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252 >