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annotate docs/html/sdldisplayformatalpha.html @ 2219:f6099efa3f0b

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Figured out how to optimize the SDL_compat path and simplify writing framebuffer drivers
author Sam Lantinga <slouken@libsdl.org>
date Fri, 10 Aug 2007 16:03:35 +0000
parents 355632dca928
children
rev   line source
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1 <HTML
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2 ><HEAD
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3 ><TITLE
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4 >SDL_DisplayFormatAlpha</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_DisplayFormat"
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17 HREF="sdldisplayformat.html"><LINK
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18 REL="NEXT"
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19 TITLE="SDL_WarpMouse"
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20 HREF="sdlwarpmouse.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="sdldisplayformat.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="sdlwarpmouse.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="SDLDISPLAYFORMATALPHA"
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74 ></A
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75 >SDL_DisplayFormatAlpha</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="AEN2432"
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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_DisplayFormatAlpha&nbsp;--&nbsp;Convert a surface to the display format</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="AEN2435"
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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="AEN2436"
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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_Surface *<B
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106 CLASS="FSFUNC"
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107 >SDL_DisplayFormatAlpha</B
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108 ></CODE
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109 >(SDL_Surface *surface);</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="AEN2442"
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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 >This function takes a surface and copies it to a new surface of the
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124 pixel format and colors of the video framebuffer plus an alpha channel,
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125 suitable for fast blitting onto the display surface. It calls
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126 <A
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127 HREF="sdlconvertsurface.html"
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128 >SDL_ConvertSurface</A
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129 ></P
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130 ><P
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131 >If you want to take advantage of hardware colorkey or alpha blit
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132 acceleration, you should set the colorkey and alpha value before
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133 calling this function.</P
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134 ><P
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135 >This function can be used to convert a colourkey to an alpha channel,
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136 if the <TT
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137 CLASS="LITERAL"
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138 >SDL_SRCCOLORKEY</TT
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139 > flag is set on the surface.
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140 The generated surface will then be transparent (alpha=0) where the
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141 pixels match the colourkey, and opaque (alpha=255) elsewhere.</P
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142 ></DIV
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143 ><DIV
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144 CLASS="REFSECT1"
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145 ><A
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146 NAME="AEN2449"
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147 ></A
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148 ><H2
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149 >Return Value</H2
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150 ><P
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151 >If the conversion fails or runs out of memory, it returns
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152 <SPAN
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153 CLASS="RETURNVALUE"
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154 >NULL</SPAN
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155 ></P
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156 ></DIV
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157 ><DIV
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158 CLASS="REFSECT1"
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159 ><A
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160 NAME="AEN2453"
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161 ></A
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162 ><H2
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163 >See Also</H2
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164 ><P
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165 ><A
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166 HREF="sdlconvertsurface.html"
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167 >SDL_ConvertSurface</A
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168 >,
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169 <A
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170 HREF="sdlsetalpha.html"
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171 >SDL_SetAlpha</A
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172 >,
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173 <A
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174 HREF="sdlsetcolorkey.html"
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175 >SDL_SetColorKey</A
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176 >,
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177 <A
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178 HREF="sdldisplayformat.html"
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179 >SDL_DisplayFormat</A
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180 >,
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181 <A
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182 HREF="sdlsurface.html"
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183 >SDL_Surface</A
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184 ></P
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185 ></DIV
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186 ><DIV
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187 CLASS="NAVFOOTER"
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188 ><HR
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189 ALIGN="LEFT"
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190 WIDTH="100%"><TABLE
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191 SUMMARY="Footer navigation table"
0
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192 WIDTH="100%"
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193 BORDER="0"
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194 CELLPADDING="0"
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195 CELLSPACING="0"
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196 ><TR
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197 ><TD
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198 WIDTH="33%"
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199 ALIGN="left"
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200 VALIGN="top"
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201 ><A
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202 HREF="sdldisplayformat.html"
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203 ACCESSKEY="P"
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204 >Prev</A
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205 ></TD
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206 ><TD
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207 WIDTH="34%"
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208 ALIGN="center"
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209 VALIGN="top"
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210 ><A
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211 HREF="index.html"
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212 ACCESSKEY="H"
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213 >Home</A
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214 ></TD
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215 ><TD
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216 WIDTH="33%"
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217 ALIGN="right"
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218 VALIGN="top"
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219 ><A
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220 HREF="sdlwarpmouse.html"
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221 ACCESSKEY="N"
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222 >Next</A
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223 ></TD
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224 ></TR
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225 ><TR
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226 ><TD
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227 WIDTH="33%"
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228 ALIGN="left"
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229 VALIGN="top"
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230 >SDL_DisplayFormat</TD
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231 ><TD
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232 WIDTH="34%"
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233 ALIGN="center"
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234 VALIGN="top"
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235 ><A
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236 HREF="video.html"
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237 ACCESSKEY="U"
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238 >Up</A
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239 ></TD
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240 ><TD
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241 WIDTH="33%"
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242 ALIGN="right"
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243 VALIGN="top"
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244 >SDL_WarpMouse</TD
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245 ></TR
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246 ></TABLE
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247 ></DIV
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248 ></BODY
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249 ></HTML
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250 >