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annotate docs/html/sdloverlay.html @ 2210:1de324fce4e8

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author Sam Lantinga <slouken@libsdl.org>
date Mon, 23 Jul 2007 01:17:38 +0000
parents 355632dca928
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1 <HTML
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2 ><HEAD
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3 ><TITLE
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4 >SDL_Overlay</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_VideoInfo"
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17 HREF="sdlvideoinfo.html"><LINK
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18 REL="NEXT"
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19 TITLE="Window Management"
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20 HREF="wm.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="sdlvideoinfo.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="wm.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="SDLOVERLAY"
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74 ></A
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75 >SDL_Overlay</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="AEN3464"
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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_Overlay&nbsp;--&nbsp;YUV video overlay</DIV
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84 ><DIV
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85 CLASS="REFSECT1"
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86 ><A
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87 NAME="AEN3467"
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88 ></A
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89 ><H2
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90 >Structure Definition</H2
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91 ><PRE
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92 CLASS="PROGRAMLISTING"
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93 >typedef struct{
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94 Uint32 format;
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95 int w, h;
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96 int planes;
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97 Uint16 *pitches;
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98 Uint8 **pixels;
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99 Uint32 hw_overlay:1;
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100 } SDL_Overlay;</PRE
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101 ></DIV
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102 ><DIV
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103 CLASS="REFSECT1"
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104 ><A
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105 NAME="AEN3470"
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106 ></A
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107 ><H2
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108 >Structure Data</H2
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109 ><DIV
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110 CLASS="INFORMALTABLE"
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111 ><A
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112 NAME="AEN3472"
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113 ></A
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114 ><P
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115 ></P
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116 ><TABLE
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117 BORDER="0"
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118 CLASS="CALSTABLE"
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119 ><TBODY
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120 ><TR
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121 ><TD
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122 ALIGN="LEFT"
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123 VALIGN="TOP"
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124 ><TT
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125 CLASS="STRUCTFIELD"
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126 ><I
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127 >format</I
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128 ></TT
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129 ></TD
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130 ><TD
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131 ALIGN="LEFT"
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132 VALIGN="TOP"
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133 >Overlay format (see below)</TD
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134 ></TR
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135 ><TR
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136 ><TD
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137 ALIGN="LEFT"
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138 VALIGN="TOP"
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139 ><TT
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140 CLASS="STRUCTFIELD"
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141 ><I
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142 >w, h</I
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143 ></TT
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144 ></TD
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145 ><TD
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146 ALIGN="LEFT"
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147 VALIGN="TOP"
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148 >Width and height of overlay</TD
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149 ></TR
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150 ><TR
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151 ><TD
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152 ALIGN="LEFT"
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153 VALIGN="TOP"
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154 ><TT
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155 CLASS="STRUCTFIELD"
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156 ><I
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157 >planes</I
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158 ></TT
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159 ></TD
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160 ><TD
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161 ALIGN="LEFT"
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162 VALIGN="TOP"
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163 >Number of planes in the overlay. Usually either 1 or 3</TD
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164 ></TR
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165 ><TR
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166 ><TD
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167 ALIGN="LEFT"
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168 VALIGN="TOP"
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169 ><TT
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170 CLASS="STRUCTFIELD"
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171 ><I
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172 >pitches</I
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173 ></TT
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174 ></TD
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175 ><TD
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176 ALIGN="LEFT"
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177 VALIGN="TOP"
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178 >An array of pitches, one for each plane. Pitch is the length of a row in bytes.</TD
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179 ></TR
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180 ><TR
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181 ><TD
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182 ALIGN="LEFT"
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183 VALIGN="TOP"
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184 ><TT
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185 CLASS="STRUCTFIELD"
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186 ><I
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187 >pixels</I
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188 ></TT
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189 ></TD
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190 ><TD
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191 ALIGN="LEFT"
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192 VALIGN="TOP"
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193 >An array of pointers to teh data of each plane. The overlay should be locked before these pointers are used.</TD
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194 ></TR
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195 ><TR
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196 ><TD
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197 ALIGN="LEFT"
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198 VALIGN="TOP"
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199 ><TT
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200 CLASS="STRUCTFIELD"
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201 ><I
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202 >hw_overlay</I
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203 ></TT
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204 ></TD
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205 ><TD
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206 ALIGN="LEFT"
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207 VALIGN="TOP"
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208 >This will be set to 1 if the overlay is hardware accelerated.</TD
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209 ></TR
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210 ></TBODY
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211 ></TABLE
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212 ><P
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213 ></P
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214 ></DIV
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215 ></DIV
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216 ><DIV
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217 CLASS="REFSECT1"
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218 ><A
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219 NAME="AEN3499"
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220 ></A
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221 ><H2
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222 >Description</H2
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223 ><P
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224 >A <SPAN
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225 CLASS="STRUCTNAME"
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226 >SDL_Overlay</SPAN
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227 > is similar to a <A
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228 HREF="sdlsurface.html"
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229 ><SPAN
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230 CLASS="STRUCTNAME"
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231 >SDL_Surface</SPAN
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232 ></A
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233 > except it stores a YUV overlay. All the fields are read only, except for <TT
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234 CLASS="STRUCTFIELD"
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235 ><I
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236 >pixels</I
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237 ></TT
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238 > which should be <A
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239 HREF="sdllockyuvoverlay.html"
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240 >locked</A
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241 > before use. The <TT
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242 CLASS="STRUCTFIELD"
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243 ><I
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244 >format</I
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245 ></TT
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246 > field stores the format of the overlay which is one of the following:
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247 <PRE
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248 CLASS="PROGRAMLISTING"
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249 >#define SDL_YV12_OVERLAY 0x32315659 /* Planar mode: Y + V + U */
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250 #define SDL_IYUV_OVERLAY 0x56555949 /* Planar mode: Y + U + V */
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251 #define SDL_YUY2_OVERLAY 0x32595559 /* Packed mode: Y0+U0+Y1+V0 */
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252 #define SDL_UYVY_OVERLAY 0x59565955 /* Packed mode: U0+Y0+V0+Y1 */
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253 #define SDL_YVYU_OVERLAY 0x55595659 /* Packed mode: Y0+V0+Y1+U0 */</PRE
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254 >
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255 More information on YUV formats can be found at <A
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256 HREF="http://www.webartz.com/fourcc/indexyuv.htm"
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257 TARGET="_top"
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258 >http://www.webartz.com/fourcc/indexyuv.htm</A
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259 >.</P
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260 ></DIV
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261 ><DIV
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262 CLASS="REFSECT1"
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263 ><A
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264 NAME="AEN3510"
0
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265 ></A
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266 ><H2
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267 >See Also</H2
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268 ><P
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269 ><A
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270 HREF="sdlcreateyuvoverlay.html"
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271 ><TT
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272 CLASS="FUNCTION"
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273 >SDL_CreateYUVOverlay</TT
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274 ></A
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275 >,
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276 <A
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277 HREF="sdllockyuvoverlay.html"
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278 ><TT
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279 CLASS="FUNCTION"
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280 >SDL_LockYUVOverlay</TT
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281 ></A
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282 >,
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283 <A
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284 HREF="sdlunlockyuvoverlay.html"
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285 ><TT
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286 CLASS="FUNCTION"
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287 >SDL_UnlockYUVOverlay</TT
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288 ></A
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289 >,
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290 <A
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291 HREF="sdlfreeyuvoverlay.html"
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292 ><TT
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293 CLASS="FUNCTION"
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294 >SDL_FreeYUVOverlay</TT
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295 ></A
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296 ></P
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297 ></DIV
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298 ><DIV
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299 CLASS="NAVFOOTER"
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300 ><HR
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301 ALIGN="LEFT"
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302 WIDTH="100%"><TABLE
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303 SUMMARY="Footer navigation table"
0
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304 WIDTH="100%"
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305 BORDER="0"
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306 CELLPADDING="0"
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307 CELLSPACING="0"
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308 ><TR
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309 ><TD
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310 WIDTH="33%"
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311 ALIGN="left"
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312 VALIGN="top"
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313 ><A
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314 HREF="sdlvideoinfo.html"
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315 ACCESSKEY="P"
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316 >Prev</A
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317 ></TD
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318 ><TD
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319 WIDTH="34%"
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320 ALIGN="center"
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321 VALIGN="top"
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322 ><A
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323 HREF="index.html"
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324 ACCESSKEY="H"
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325 >Home</A
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326 ></TD
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327 ><TD
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328 WIDTH="33%"
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329 ALIGN="right"
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330 VALIGN="top"
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331 ><A
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332 HREF="wm.html"
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333 ACCESSKEY="N"
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334 >Next</A
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335 ></TD
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336 ></TR
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337 ><TR
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338 ><TD
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339 WIDTH="33%"
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340 ALIGN="left"
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341 VALIGN="top"
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342 >SDL_VideoInfo</TD
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343 ><TD
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344 WIDTH="34%"
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345 ALIGN="center"
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346 VALIGN="top"
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347 ><A
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348 HREF="video.html"
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349 ACCESSKEY="U"
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350 >Up</A
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351 ></TD
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352 ><TD
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353 WIDTH="33%"
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354 ALIGN="right"
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355 VALIGN="top"
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356 >Window Management</TD
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357 ></TR
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358 ></TABLE
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359 ></DIV
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360 ></BODY
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361 ></HTML
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362 >