annotate docs/html/sdlsetpalette.html @ 4159:a1b03ba2fcd0 SDL-1.2

Updated copyright date
author Sam Lantinga <slouken@libsdl.org>
date Mon, 08 Dec 2008 00:25:42 +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_SetPalette</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_SetColors"
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17 HREF="sdlsetcolors.html"><LINK
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18 REL="NEXT"
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19 TITLE="SDL_SetGamma"
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20 HREF="sdlsetgamma.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="sdlsetcolors.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="sdlsetgamma.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="SDLSETPALETTE"
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74 ></A
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75 >SDL_SetPalette</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="AEN1517"
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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_SetPalette&nbsp;--&nbsp;Sets the colors in the palette of an 8-bit 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="AEN1520"
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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="AEN1521"
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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 >int <B
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106 CLASS="FSFUNC"
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107 >SDL_SetPalette</B
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108 ></CODE
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109 >(SDL_Surface *surface, int flags, SDL_Color *colors, int firstcolor, int ncolors);</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="AEN1527"
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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 >Sets a portion of the palette for the given 8-bit surface.</P
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124 ><P
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125 >Palettized (8-bit) screen surfaces with the
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126 <TT
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127 CLASS="LITERAL"
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128 >SDL_HWPALETTE</TT
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129 > flag have two palettes, a logical
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130 palette that is used for mapping blits to/from the surface and a
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131 physical palette (that determines how the hardware will map the colors
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132 to the display). <A
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133 HREF="sdlblitsurface.html"
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134 >SDL_BlitSurface</A
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135 >
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136 always uses the logical palette when blitting surfaces (if it has to
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137 convert between surface pixel formats). Because of this, it is often
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138 useful to modify only one or the other palette to achieve various
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139 special color effects (e.g., screen fading, color flashes, screen dimming).</P
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140 ><P
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141 >This function can modify either the logical or physical palette by
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142 specifing <TT
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143 CLASS="LITERAL"
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144 >SDL_LOGPAL</TT
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145 > or
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146 <TT
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147 CLASS="LITERAL"
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148 >SDL_PHYSPAL</TT
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149 >the in the <TT
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150 CLASS="PARAMETER"
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151 ><I
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152 >flags</I
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153 ></TT
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154 >
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155 parameter.</P
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156 ><P
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157 >When <TT
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158 CLASS="PARAMETER"
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159 ><I
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160 >surface</I
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161 ></TT
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162 > is the surface associated with the current
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163 display, the display colormap will be updated with the requested colors. If
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164 <TT
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165 CLASS="LITERAL"
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166 >SDL_HWPALETTE</TT
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167 > was set in <A
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168 HREF="sdlsetvideomode.html"
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169 >SDL_SetVideoMode</A
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170 > flags,
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171 <TT
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172 CLASS="FUNCTION"
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173 >SDL_SetPalette</TT
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174 > will always return <SPAN
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175 CLASS="RETURNVALUE"
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176 >1</SPAN
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177 >,
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178 and the palette is guaranteed to be set the way you desire, even if the window
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179 colormap has to be warped or run under emulation.</P
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180 ><P
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181 >The color components of a
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182 <A
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183 HREF="sdlcolor.html"
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184 ><SPAN
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185 CLASS="STRUCTNAME"
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186 >SDL_Color</SPAN
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187 ></A
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188 > structure
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189 are 8-bits in size, giving you a total of
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190 256<SUP
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191 >3</SUP
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192 >=16777216 colors.</P
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193 ></DIV
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194 ><DIV
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195 CLASS="REFSECT1"
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196 ><A
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197 NAME="AEN1547"
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198 ></A
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199 ><H2
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200 >Return Value</H2
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201 ><P
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202 >If <TT
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203 CLASS="PARAMETER"
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204 ><I
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205 >surface</I
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206 ></TT
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207 > is not a palettized surface, this function
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208 does nothing, returning <SPAN
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209 CLASS="RETURNVALUE"
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210 >0</SPAN
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211 >. If all of the colors were set
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212 as passed to <TT
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213 CLASS="FUNCTION"
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214 >SDL_SetPalette</TT
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215 >, it will return
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216 <SPAN
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217 CLASS="RETURNVALUE"
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218 >1</SPAN
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219 >. If not all the color entries were set exactly as
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220 given, it will return <SPAN
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221 CLASS="RETURNVALUE"
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222 >0</SPAN
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223 >, and you should look at the
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224 surface palette to determine the actual color palette.</P
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225 ></DIV
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226 ><DIV
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227 CLASS="REFSECT1"
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228 ><A
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229 NAME="AEN1555"
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230 ></A
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231 ><H2
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232 >Example</H2
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233 ><PRE
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234 CLASS="PROGRAMLISTING"
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235 > /* Create a display surface with a grayscale palette */
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236 SDL_Surface *screen;
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237 SDL_Color colors[256];
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238 int i;
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239 .
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240 .
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241 .
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242 /* Fill colors with color information */
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243 for(i=0;i&#60;256;i++){
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244 colors[i].r=i;
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245 colors[i].g=i;
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246 colors[i].b=i;
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247 }
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248
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249 /* Create display */
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250 screen=SDL_SetVideoMode(640, 480, 8, SDL_HWPALETTE);
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251 if(!screen){
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252 printf("Couldn't set video mode: %s\n", SDL_GetError());
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253 exit(-1);
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254 }
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255
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256 /* Set palette */
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257 SDL_SetPalette(screen, SDL_LOGPAL|SDL_PHYSPAL, colors, 0, 256);
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258 .
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259 .
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260 .
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261 .</PRE
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262 ></DIV
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263 ><DIV
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264 CLASS="REFSECT1"
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265 ><A
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266 NAME="AEN1558"
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267 ></A
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268 ><H2
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269 >See Also</H2
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270 ><P
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271 ><A
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272 HREF="sdlsetcolors.html"
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273 >SDL_SetColors</A
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274 >,
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275 <A
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276 HREF="sdlsetvideomode.html"
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277 >SDL_SetVideoMode</A
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278 >,
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279 <A
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280 HREF="sdlsurface.html"
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281 >SDL_Surface</A
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282 >,
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283 <A
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284 HREF="sdlcolor.html"
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285 >SDL_Color</A
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286 ></P
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287 ></DIV
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288 ><DIV
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289 CLASS="NAVFOOTER"
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290 ><HR
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291 ALIGN="LEFT"
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292 WIDTH="100%"><TABLE
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293 SUMMARY="Footer navigation table"
0
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294 WIDTH="100%"
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295 BORDER="0"
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296 CELLPADDING="0"
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297 CELLSPACING="0"
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298 ><TR
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299 ><TD
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300 WIDTH="33%"
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301 ALIGN="left"
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302 VALIGN="top"
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303 ><A
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304 HREF="sdlsetcolors.html"
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305 ACCESSKEY="P"
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306 >Prev</A
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307 ></TD
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308 ><TD
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309 WIDTH="34%"
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310 ALIGN="center"
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311 VALIGN="top"
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312 ><A
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313 HREF="index.html"
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314 ACCESSKEY="H"
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315 >Home</A
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316 ></TD
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317 ><TD
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318 WIDTH="33%"
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319 ALIGN="right"
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320 VALIGN="top"
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321 ><A
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322 HREF="sdlsetgamma.html"
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323 ACCESSKEY="N"
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324 >Next</A
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325 ></TD
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326 ></TR
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327 ><TR
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328 ><TD
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329 WIDTH="33%"
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330 ALIGN="left"
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331 VALIGN="top"
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332 >SDL_SetColors</TD
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333 ><TD
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334 WIDTH="34%"
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335 ALIGN="center"
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336 VALIGN="top"
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337 ><A
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338 HREF="video.html"
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339 ACCESSKEY="U"
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340 >Up</A
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341 ></TD
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342 ><TD
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343 WIDTH="33%"
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344 ALIGN="right"
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345 VALIGN="top"
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346 >SDL_SetGamma</TD
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347 ></TR
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348 ></TABLE
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349 ></DIV
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350 ></BODY
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351 ></HTML
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352 >