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annotate docs/html/sdlcreateyuvoverlay.html @ 2328:91e601d9df8b

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re: bug#563. checking in some commented out trace code and a fix so that the in testalpha.c the background only flashes when alpha == 255. The problem that is being fixed is caused by clearing SDL_COPY_RLE_COLORKEY without setting SDL_COPY_RLE_DESIRED in SDL_UnRELSurface.
author Bob Pendleton <bob@pendleton.com>
date Fri, 14 Mar 2008 18:17:49 +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_CreateYUVOverlay</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_GL_SwapBuffers"
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17 HREF="sdlglswapbuffers.html"><LINK
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18 REL="NEXT"
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19 TITLE="SDL_LockYUVOverlay"
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20 HREF="sdllockyuvoverlay.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"
0
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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="sdlglswapbuffers.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="sdllockyuvoverlay.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="SDLCREATEYUVOVERLAY"
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74 ></A
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75 >SDL_CreateYUVOverlay</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="AEN2808"
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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_CreateYUVOverlay&nbsp;--&nbsp;Create a YUV video 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="AEN2811"
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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="AEN2812"
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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 >SDL_Overlay *<B
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106 CLASS="FSFUNC"
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107 >SDL_CreateYUVOverlay</B
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108 ></CODE
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109 >(int width, int height, Uint32 format, SDL_Surface *display);</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="AEN2818"
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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 ><TT
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124 CLASS="FUNCTION"
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125 >SDL_CreateYUVOverlay</TT
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126 > creates a YUV overlay of the specified <TT
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127 CLASS="PARAMETER"
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128 ><I
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129 >width</I
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130 ></TT
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131 >, <TT
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132 CLASS="PARAMETER"
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133 ><I
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134 >height</I
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135 ></TT
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136 > and <TT
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137 CLASS="PARAMETER"
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138 ><I
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139 >format</I
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140 ></TT
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141 > (see <A
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142 HREF="sdloverlay.html"
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143 ><SPAN
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144 CLASS="STRUCTNAME"
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145 >SDL_Overlay</SPAN
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146 ></A
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147 > for a list of available formats), for the provided <TT
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148 CLASS="PARAMETER"
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149 ><I
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150 >display</I
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151 ></TT
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152 >. A <A
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153 HREF="sdloverlay.html"
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154 ><SPAN
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155 CLASS="STRUCTNAME"
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156 >SDL_Overlay</SPAN
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157 ></A
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158 > structure is returned.</P
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159 ><P
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160 >The term 'overlay' is a misnomer since, unless the overlay is created in hardware, the contents for the display surface underneath the area where the overlay is shown will be overwritten when the overlay is displayed.</P
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161 ></DIV
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162 ><DIV
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163 CLASS="REFSECT1"
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164 ><A
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165 NAME="AEN2831"
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166 ></A
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167 ><H2
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168 >See Also</H2
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169 ><P
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170 ><A
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171 HREF="sdloverlay.html"
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172 ><SPAN
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173 CLASS="STRUCTNAME"
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174 >SDL_Overlay</SPAN
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175 ></A
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176 >,
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177 <A
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178 HREF="sdldisplayyuvoverlay.html"
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179 ><TT
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180 CLASS="FUNCTION"
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181 >SDL_DisplayYUVOverlay</TT
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182 ></A
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183 >,
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184 <A
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185 HREF="sdlfreeyuvoverlay.html"
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186 ><TT
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187 CLASS="FUNCTION"
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188 >SDL_FreeYUVOverlay</TT
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189 ></A
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190 ></P
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191 ></DIV
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192 ><DIV
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193 CLASS="NAVFOOTER"
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194 ><HR
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195 ALIGN="LEFT"
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196 WIDTH="100%"><TABLE
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197 SUMMARY="Footer navigation table"
0
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198 WIDTH="100%"
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199 BORDER="0"
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200 CELLPADDING="0"
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201 CELLSPACING="0"
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202 ><TR
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203 ><TD
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204 WIDTH="33%"
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205 ALIGN="left"
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206 VALIGN="top"
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207 ><A
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208 HREF="sdlglswapbuffers.html"
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209 ACCESSKEY="P"
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210 >Prev</A
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211 ></TD
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212 ><TD
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213 WIDTH="34%"
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214 ALIGN="center"
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215 VALIGN="top"
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216 ><A
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217 HREF="index.html"
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218 ACCESSKEY="H"
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219 >Home</A
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220 ></TD
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221 ><TD
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222 WIDTH="33%"
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223 ALIGN="right"
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224 VALIGN="top"
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225 ><A
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226 HREF="sdllockyuvoverlay.html"
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227 ACCESSKEY="N"
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228 >Next</A
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229 ></TD
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230 ></TR
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231 ><TR
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232 ><TD
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233 WIDTH="33%"
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234 ALIGN="left"
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235 VALIGN="top"
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236 >SDL_GL_SwapBuffers</TD
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237 ><TD
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238 WIDTH="34%"
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239 ALIGN="center"
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240 VALIGN="top"
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241 ><A
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242 HREF="video.html"
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243 ACCESSKEY="U"
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244 >Up</A
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245 ></TD
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246 ><TD
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247 WIDTH="33%"
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248 ALIGN="right"
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249 VALIGN="top"
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250 >SDL_LockYUVOverlay</TD
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251 ></TR
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252 ></TABLE
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253 ></DIV
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254 ></BODY
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255 ></HTML
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256 >