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annotate docs/html/sdlcreatergbsurface.html @ 2173:26233707bc94

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author Sam Lantinga <slouken@libsdl.org>
date Wed, 11 Jul 2007 14:51:49 +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_CreateRGBSurface</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_GetRGBA"
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17 HREF="sdlgetrgba.html"><LINK
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18 REL="NEXT"
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19 TITLE="SDL_CreateRGBSurfaceFrom"
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20 HREF="sdlcreatergbsurfacefrom.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="sdlgetrgba.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="sdlcreatergbsurfacefrom.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="SDLCREATERGBSURFACE"
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74 ></A
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75 >SDL_CreateRGBSurface</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="AEN1773"
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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_CreateRGBSurface&nbsp;--&nbsp;Create an empty SDL_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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87 NAME="AEN1776"
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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="AEN1777"
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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_CreateRGBSurface</B
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108 ></CODE
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109 >(Uint32 flags, int width, int height, int depth, Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask);</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="AEN1783"
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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 >Allocate an empty surface (must be called after <A
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124 HREF="sdlsetvideomode.html"
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125 >SDL_SetVideoMode</A
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126 >)</P
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127 ><P
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128 >If <TT
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129 CLASS="PARAMETER"
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130 ><I
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131 >depth</I
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132 ></TT
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133 > is 8 bits an empty palette is allocated for the surface, otherwise a 'packed-pixel' <A
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134 HREF="sdlpixelformat.html"
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135 ><SPAN
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136 CLASS="STRUCTNAME"
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137 >SDL_PixelFormat</SPAN
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138 ></A
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139 > is created using the <TT
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140 CLASS="PARAMETER"
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141 ><I
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142 >[RGBA]mask</I
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143 ></TT
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144 >'s provided (see <A
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145 HREF="sdlpixelformat.html"
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146 ><SPAN
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147 CLASS="STRUCTNAME"
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148 >SDL_PixelFormat</SPAN
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149 ></A
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150 >). The <TT
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151 CLASS="PARAMETER"
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152 ><I
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153 >flags</I
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154 ></TT
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155 > specifies the type of surface that should be created, it is an OR'd combination of the following possible values.</P
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156 ><DIV
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157 CLASS="INFORMALTABLE"
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158 ><A
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159 NAME="AEN1795"
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160 ></A
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161 ><P
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162 ></P
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163 ><TABLE
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164 BORDER="1"
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165 CLASS="CALSTABLE"
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166 ><TBODY
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167 ><TR
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168 ><TD
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169 ALIGN="LEFT"
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170 VALIGN="TOP"
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171 ><TT
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172 CLASS="LITERAL"
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173 >SDL_SWSURFACE</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 >SDL will create the surface in system memory. This improves the performance of pixel level access, however you may not be able to take advantage of some types of hardware blitting.</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="LITERAL"
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186 >SDL_HWSURFACE</TT
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187 ></TD
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188 ><TD
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189 ALIGN="LEFT"
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190 VALIGN="TOP"
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191 >SDL will attempt to create the surface in video memory. This will allow SDL to take advantage of Video-&#62;Video blits (which are often accelerated).</TD
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192 ></TR
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193 ><TR
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194 ><TD
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195 ALIGN="LEFT"
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196 VALIGN="TOP"
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197 ><TT
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198 CLASS="LITERAL"
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199 >SDL_SRCCOLORKEY</TT
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200 ></TD
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201 ><TD
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202 ALIGN="LEFT"
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203 VALIGN="TOP"
55
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204 >This flag turns on colourkeying for blits from this surface. If
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205 <TT
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206 CLASS="LITERAL"
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207 >SDL_HWSURFACE</TT
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208 > is also specified and colourkeyed blits
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209 are hardware-accelerated, then SDL will attempt to place the surface in
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210 video memory.
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211 Use <A
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212 HREF="sdlsetcolorkey.html"
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213 ><TT
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214 CLASS="FUNCTION"
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215 >SDL_SetColorKey</TT
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216 ></A
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217 >
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218 to set or clear this flag after surface creation.</TD
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219 ></TR
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220 ><TR
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221 ><TD
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222 ALIGN="LEFT"
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223 VALIGN="TOP"
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224 ><TT
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225 CLASS="LITERAL"
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226 >SDL_SRCALPHA</TT
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227 ></TD
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228 ><TD
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229 ALIGN="LEFT"
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230 VALIGN="TOP"
55
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231 >This flag turns on alpha-blending for blits from this surface. If
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232 <TT
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233 CLASS="LITERAL"
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234 >SDL_HWSURFACE</TT
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235 > is also specified and alpha-blending blits
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236 are hardware-accelerated, then the surface will be placed in video memory if
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237 possible.
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238 Use <A
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239 HREF="sdlsetalpha.html"
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240 ><TT
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241 CLASS="FUNCTION"
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242 >SDL_SetAlpha</TT
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243 ></A
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244 > to
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245 set or clear this flag after surface creation.</TD
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246 ></TR
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247 ></TBODY
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248 ></TABLE
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249 ><P
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250 ></P
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251 ></DIV
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252 ><DIV
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253 CLASS="NOTE"
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254 ><BLOCKQUOTE
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255 CLASS="NOTE"
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256 ><P
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257 ><B
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258 >Note: </B
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259 >If an alpha-channel is specified (that is, if <TT
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260 CLASS="PARAMETER"
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261 ><I
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262 >Amask</I
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263 ></TT
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264 > is
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265 nonzero), then the <TT
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266 CLASS="LITERAL"
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267 >SDL_SRCALPHA</TT
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268 > flag is automatically
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269 set. You may remove this flag by calling
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270 <A
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271 HREF="sdlsetalpha.html"
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272 ><TT
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273 CLASS="FUNCTION"
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274 >SDL_SetAlpha</TT
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275 ></A
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276 >
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277 after surface creation.</P
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278 ></BLOCKQUOTE
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279 ></DIV
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280 ></DIV
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281 ><DIV
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282 CLASS="REFSECT1"
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283 ><A
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284 NAME="AEN1826"
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285 ></A
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286 ><H2
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287 >Return Value</H2
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288 ><P
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289 >Returns the created surface, or <SPAN
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290 CLASS="RETURNVALUE"
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291 >NULL</SPAN
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292 > upon error.</P
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293 ></DIV
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294 ><DIV
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295 CLASS="REFSECT1"
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296 ><A
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297 NAME="AEN1830"
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298 ></A
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299 ><H2
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300 >Example</H2
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301 ><PRE
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302 CLASS="PROGRAMLISTING"
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303 > /* Create a 32-bit surface with the bytes of each pixel in R,G,B,A order,
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304 as expected by OpenGL for textures */
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305 SDL_Surface *surface;
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306 Uint32 rmask, gmask, bmask, amask;
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307
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308 /* SDL interprets each pixel as a 32-bit number, so our masks must depend
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309 on the endianness (byte order) of the machine */
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310 #if SDL_BYTEORDER == SDL_BIG_ENDIAN
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311 rmask = 0xff000000;
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312 gmask = 0x00ff0000;
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313 bmask = 0x0000ff00;
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314 amask = 0x000000ff;
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315 #else
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316 rmask = 0x000000ff;
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317 gmask = 0x0000ff00;
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318 bmask = 0x00ff0000;
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319 amask = 0xff000000;
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320 #endif
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321
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322 surface = SDL_CreateRGBSurface(SDL_SWSURFACE, width, height, 32,
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323 rmask, gmask, bmask, amask);
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324 if(surface == NULL) {
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325 fprintf(stderr, "CreateRGBSurface failed: %s\n", SDL_GetError());
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326 exit(1);
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327 }</PRE
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328 ></DIV
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329 ><DIV
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330 CLASS="REFSECT1"
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331 ><A
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332 NAME="AEN1833"
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333 ></A
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334 ><H2
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335 >See Also</H2
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336 ><P
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337 ><A
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338 HREF="sdlcreatergbsurfacefrom.html"
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339 ><TT
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340 CLASS="FUNCTION"
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341 >SDL_CreateRGBSurfaceFrom</TT
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342 ></A
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343 >,
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344 <A
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345 HREF="sdlfreesurface.html"
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346 ><TT
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347 CLASS="FUNCTION"
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348 >SDL_FreeSurface</TT
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349 ></A
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350 >,
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351 <A
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352 HREF="sdlsetvideomode.html"
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353 ><TT
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354 CLASS="FUNCTION"
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355 >SDL_SetVideoMode</TT
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356 ></A
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357 >,
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358 <A
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359 HREF="sdllocksurface.html"
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360 ><TT
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361 CLASS="FUNCTION"
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362 >SDL_LockSurface</TT
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363 ></A
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364 >,
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365 <A
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366 HREF="sdlpixelformat.html"
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367 ><SPAN
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368 CLASS="STRUCTNAME"
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369 >SDL_PixelFormat</SPAN
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370 ></A
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371 >,
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372 <A
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373 HREF="sdlsurface.html"
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374 ><SPAN
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375 CLASS="STRUCTNAME"
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376 >SDL_Surface</SPAN
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377 ></A
55
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378 >
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379 <A
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380 HREF="sdlsetalpha.html"
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381 ><TT
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382 CLASS="FUNCTION"
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383 >SDL_SetAlpha</TT
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384 ></A
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385 >
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386 <A
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387 HREF="sdlsetcolorkey.html"
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388 ><TT
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389 CLASS="FUNCTION"
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390 >SDL_SetColorKey</TT
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391 ></A
0
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392 ></P
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393 ></DIV
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394 ><DIV
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395 CLASS="NAVFOOTER"
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396 ><HR
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397 ALIGN="LEFT"
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398 WIDTH="100%"><TABLE
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399 SUMMARY="Footer navigation table"
0
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400 WIDTH="100%"
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401 BORDER="0"
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402 CELLPADDING="0"
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403 CELLSPACING="0"
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404 ><TR
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405 ><TD
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406 WIDTH="33%"
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407 ALIGN="left"
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408 VALIGN="top"
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409 ><A
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410 HREF="sdlgetrgba.html"
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411 ACCESSKEY="P"
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412 >Prev</A
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413 ></TD
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414 ><TD
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415 WIDTH="34%"
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416 ALIGN="center"
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417 VALIGN="top"
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418 ><A
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419 HREF="index.html"
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420 ACCESSKEY="H"
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421 >Home</A
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422 ></TD
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423 ><TD
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424 WIDTH="33%"
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425 ALIGN="right"
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426 VALIGN="top"
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427 ><A
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428 HREF="sdlcreatergbsurfacefrom.html"
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429 ACCESSKEY="N"
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430 >Next</A
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431 ></TD
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432 ></TR
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433 ><TR
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434 ><TD
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435 WIDTH="33%"
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436 ALIGN="left"
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437 VALIGN="top"
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438 >SDL_GetRGBA</TD
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439 ><TD
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440 WIDTH="34%"
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441 ALIGN="center"
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442 VALIGN="top"
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443 ><A
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444 HREF="video.html"
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445 ACCESSKEY="U"
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446 >Up</A
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447 ></TD
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448 ><TD
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449 WIDTH="33%"
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450 ALIGN="right"
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451 VALIGN="top"
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452 >SDL_CreateRGBSurfaceFrom</TD
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453 ></TR
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454 ></TABLE
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455 ></DIV
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456 ></BODY
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457 ></HTML
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458 >