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annotate docs/html/sdlmaprgb.html @ 980:7d6f8804a293

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OSMesa draws upside down
author Patrice Mandin <patmandin@gmail.com>
date Sat, 20 Nov 2004 20:47:52 +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_MapRGB</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_SetGammaRamp"
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17 HREF="sdlsetgammaramp.html"><LINK
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18 REL="NEXT"
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19 TITLE="SDL_MapRGBA"
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20 HREF="sdlmaprgba.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="sdlsetgammaramp.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="sdlmaprgba.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="SDLMAPRGB"
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74 ></A
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75 >SDL_MapRGB</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="AEN1652"
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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_MapRGB&nbsp;--&nbsp;Map a RGB color value to a pixel 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="AEN1655"
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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="AEN1656"
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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 >Uint32 <B
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106 CLASS="FSFUNC"
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107 >SDL_MapRGB</B
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108 ></CODE
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109 >(SDL_PixelFormat *fmt, Uint8 r, Uint8 g, Uint8 b);</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="AEN1662"
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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 >Maps the RGB color value to the specified pixel format and returns the
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124 pixel value as a 32-bit int.</P
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125 ><P
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126 >If the format has a palette (8-bit) the index of the closest matching
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127 color in the palette will be returned.</P
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128 ><P
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129 >If the specified pixel format has an alpha component it will be returned
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130 as all 1 bits (fully opaque).</P
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131 ></DIV
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132 ><DIV
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133 CLASS="REFSECT1"
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134 ><A
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135 NAME="AEN1667"
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136 ></A
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137 ><H2
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138 >Return Value</H2
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139 ><P
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140 >A pixel value best approximating the given RGB color value for a given
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141 pixel format. If the pixel format bpp (color depth) is less than 32-bpp
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142 then the unused upper bits of the return value can safely be ignored
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143 (e.g., with a 16-bpp format the return value can be assigned to a
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144 <SPAN
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145 CLASS="TYPE"
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146 >Uint16</SPAN
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147 >, and similarly a <SPAN
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148 CLASS="TYPE"
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149 >Uint8</SPAN
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150 > for an 8-bpp
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151 format).</P
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152 ></DIV
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153 ><DIV
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154 CLASS="REFSECT1"
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155 ><A
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156 NAME="AEN1672"
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157 ></A
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158 ><H2
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159 >See Also</H2
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160 ><P
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161 ><A
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162 HREF="sdlgetrgb.html"
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163 ><TT
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164 CLASS="FUNCTION"
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165 >SDL_GetRGB</TT
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166 ></A
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167 >,
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168 <A
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169 HREF="sdlgetrgba.html"
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170 ><TT
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171 CLASS="FUNCTION"
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172 >SDL_GetRGBA</TT
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173 ></A
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174 >,
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175 <A
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176 HREF="sdlmaprgba.html"
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177 ><TT
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178 CLASS="FUNCTION"
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179 >SDL_MapRGBA</TT
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180 ></A
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181 >,
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182 <A
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183 HREF="sdlpixelformat.html"
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184 ><SPAN
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185 CLASS="STRUCTNAME"
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186 >SDL_PixelFormat</SPAN
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187 ></A
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188 ></P
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189 ></DIV
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190 ><DIV
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191 CLASS="NAVFOOTER"
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192 ><HR
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193 ALIGN="LEFT"
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194 WIDTH="100%"><TABLE
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195 SUMMARY="Footer navigation table"
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196 WIDTH="100%"
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197 BORDER="0"
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198 CELLPADDING="0"
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199 CELLSPACING="0"
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200 ><TR
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201 ><TD
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202 WIDTH="33%"
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203 ALIGN="left"
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204 VALIGN="top"
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205 ><A
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206 HREF="sdlsetgammaramp.html"
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207 ACCESSKEY="P"
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208 >Prev</A
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209 ></TD
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210 ><TD
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211 WIDTH="34%"
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212 ALIGN="center"
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213 VALIGN="top"
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214 ><A
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215 HREF="index.html"
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216 ACCESSKEY="H"
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217 >Home</A
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218 ></TD
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219 ><TD
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220 WIDTH="33%"
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221 ALIGN="right"
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222 VALIGN="top"
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223 ><A
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224 HREF="sdlmaprgba.html"
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225 ACCESSKEY="N"
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226 >Next</A
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227 ></TD
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228 ></TR
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229 ><TR
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230 ><TD
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231 WIDTH="33%"
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232 ALIGN="left"
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233 VALIGN="top"
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234 >SDL_SetGammaRamp</TD
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235 ><TD
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236 WIDTH="34%"
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237 ALIGN="center"
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238 VALIGN="top"
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239 ><A
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240 HREF="video.html"
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241 ACCESSKEY="U"
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242 >Up</A
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243 ></TD
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244 ><TD
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245 WIDTH="33%"
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246 ALIGN="right"
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247 VALIGN="top"
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248 >SDL_MapRGBA</TD
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249 ></TR
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250 ></TABLE
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251 ></DIV
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252 ></BODY
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253 ></HTML
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254 >