annotate docs/html/sdlconvertsurface.html @ 1897:c2a27da60b18

Solved the performance problems by introducing the concept of a single-buffered display, which is a fast path used for the whole-surface SDL 1.2 API. Solved the flicker problems by implementing a backbuffer in the GDI renderer. Unfortunately, now using the GDI renderer with a backbuffer and HBITMAPs is significantly slower than SDL's surface code. *sigh*
author Sam Lantinga <slouken@libsdl.org>
date Wed, 12 Jul 2006 06:39:26 +0000
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1 <HTML
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3 ><TITLE
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4 >SDL_ConvertSurface</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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19 TITLE="SDL_BlitSurface"
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20 HREF="sdlblitsurface.html"></HEAD
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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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34 CELLPADDING="0"
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35 CELLSPACING="0"
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36 ><TR
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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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47 ><A
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48 HREF="sdlgetcliprect.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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57 ><TD
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58 WIDTH="10%"
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61 ><A
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62 HREF="sdlblitsurface.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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71 ><H1
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72 ><A
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73 NAME="SDLCONVERTSURFACE"
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74 ></A
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75 >SDL_ConvertSurface</H1
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76 ><DIV
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77 CLASS="REFNAMEDIV"
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78 ><A
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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_ConvertSurface&nbsp;--&nbsp;Converts a surface to the same format as another surface.</DIV
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84 ><DIV
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85 CLASS="REFSYNOPSISDIV"
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86 ><A
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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="AEN2262"
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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/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_Surface *<B
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106 CLASS="FSFUNC"
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107 >SDL_ConvertSurface</B
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108 ></CODE
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109 >(SDL_Surface *src, SDL_PixelFormat *fmt, Uint32 flags);</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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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 >Creates a new surface of the specified format, and then copies and maps
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124 the given surface to it. If this function fails, it returns
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125 <TT
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126 CLASS="LITERAL"
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127 >NULL</TT
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128 >.</P
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129 ><P
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130 >The <TT
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131 CLASS="PARAMETER"
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132 ><I
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133 >flags</I
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134 ></TT
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135 > parameter is passed to
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136 <A
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137 HREF="sdlcreatergbsurface.html"
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138 ><TT
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139 CLASS="FUNCTION"
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140 >SDL_CreateRGBSurface</TT
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141 ></A
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142 >
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143 and has those semantics.</P
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144 ><P
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145 >This function is used internally by
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146 <A
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147 HREF="sdldisplayformat.html"
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148 ><TT
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149 CLASS="FUNCTION"
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150 >SDL_DisplayFormat</TT
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151 ></A
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152 >.</P
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153 ><P
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154 >This function can only be called after SDL_Init.</P
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155 ></DIV
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156 ><DIV
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157 CLASS="REFSECT1"
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158 ><A
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159 NAME="AEN2280"
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160 ></A
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161 ><H2
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162 >Return Value</H2
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163 ><P
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164 >Returns either a pointer to the new surface, or
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165 <TT
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166 CLASS="LITERAL"
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167 >NULL</TT
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168 > on error.</P
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169 ></DIV
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170 ><DIV
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171 CLASS="REFSECT1"
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172 ><A
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173 NAME="AEN2284"
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174 ></A
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175 ><H2
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176 >See Also</H2
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177 ><P
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178 ><A
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179 HREF="sdlcreatergbsurface.html"
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180 ><TT
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181 CLASS="FUNCTION"
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182 >SDL_CreateRGBSurface</TT
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183 ></A
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184 >,
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185 <A
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186 HREF="sdldisplayformat.html"
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187 ><TT
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188 CLASS="FUNCTION"
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189 >SDL_DisplayFormat</TT
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190 ></A
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191 >,
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192 <A
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193 HREF="sdlpixelformat.html"
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194 ><SPAN
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195 CLASS="STRUCTNAME"
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196 >SDL_PixelFormat</SPAN
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197 ></A
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198 >,
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199 <A
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200 HREF="sdlsurface.html"
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201 ><SPAN
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202 CLASS="STRUCTNAME"
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203 >SDL_Surface</SPAN
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204 ></A
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205 ></P
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206 ></DIV
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207 ><DIV
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208 CLASS="NAVFOOTER"
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209 ><HR
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210 ALIGN="LEFT"
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211 WIDTH="100%"><TABLE
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212 SUMMARY="Footer navigation table"
0
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213 WIDTH="100%"
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214 BORDER="0"
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215 CELLPADDING="0"
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216 CELLSPACING="0"
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217 ><TR
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218 ><TD
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219 WIDTH="33%"
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220 ALIGN="left"
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221 VALIGN="top"
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222 ><A
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223 HREF="sdlgetcliprect.html"
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224 ACCESSKEY="P"
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225 >Prev</A
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226 ></TD
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227 ><TD
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228 WIDTH="34%"
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229 ALIGN="center"
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230 VALIGN="top"
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231 ><A
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232 HREF="index.html"
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233 ACCESSKEY="H"
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234 >Home</A
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235 ></TD
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236 ><TD
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237 WIDTH="33%"
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238 ALIGN="right"
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239 VALIGN="top"
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240 ><A
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241 HREF="sdlblitsurface.html"
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242 ACCESSKEY="N"
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243 >Next</A
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244 ></TD
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245 ></TR
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246 ><TR
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247 ><TD
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248 WIDTH="33%"
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249 ALIGN="left"
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250 VALIGN="top"
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251 >SDL_GetClipRect</TD
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252 ><TD
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253 WIDTH="34%"
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254 ALIGN="center"
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255 VALIGN="top"
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256 ><A
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257 HREF="video.html"
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258 ACCESSKEY="U"
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259 >Up</A
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260 ></TD
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261 ><TD
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262 WIDTH="33%"
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263 ALIGN="right"
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264 VALIGN="top"
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265 >SDL_BlitSurface</TD
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266 ></TR
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267 ></TABLE
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268 ></DIV
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269 ></BODY
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270 ></HTML
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271 >