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1 <HTML
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2 ><HEAD
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3 ><TITLE
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4 >SDL_SetGammaRamp</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 1.61
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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_GetGammaRamp"
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17 HREF="sdlgetgammaramp.html"><LINK
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18 REL="NEXT"
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19 TITLE="SDL_MapRGB"
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20 HREF="sdlmaprgb.html"></HEAD
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21 ><BODY
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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 WIDTH="100%"
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32 BORDER="0"
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33 CELLPADDING="0"
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34 CELLSPACING="0"
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35 ><TR
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36 ><TH
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37 COLSPAN="3"
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38 ALIGN="center"
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39 >SDL Library Documentation</TH
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40 ></TR
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41 ><TR
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42 ><TD
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43 WIDTH="10%"
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44 ALIGN="left"
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45 VALIGN="bottom"
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46 ><A
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47 HREF="sdlgetgammaramp.html"
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48 >Prev</A
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49 ></TD
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50 ><TD
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51 WIDTH="80%"
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52 ALIGN="center"
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53 VALIGN="bottom"
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54 ></TD
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55 ><TD
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56 WIDTH="10%"
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57 ALIGN="right"
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58 VALIGN="bottom"
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59 ><A
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60 HREF="sdlmaprgb.html"
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61 >Next</A
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62 ></TD
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63 ></TR
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64 ></TABLE
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65 ><HR
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66 ALIGN="LEFT"
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67 WIDTH="100%"></DIV
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68 ><H1
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69 ><A
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70 NAME="SDLSETGAMMARAMP"
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71 >SDL_SetGammaRamp</A
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72 ></H1
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73 ><DIV
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74 CLASS="REFNAMEDIV"
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75 ><A
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76 NAME="AEN1167"
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77 ></A
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78 ><H2
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79 >Name</H2
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80 >SDL_SetGammaRamp -- Sets the color gamma lookup tables for the display</DIV
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81 ><DIV
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82 CLASS="REFSYNOPSISDIV"
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83 ><A
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84 NAME="AEN1170"
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85 ></A
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86 ><H2
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87 >Synopsis</H2
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88 ><DIV
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89 CLASS="FUNCSYNOPSIS"
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90 ><A
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91 NAME="AEN1171"
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92 ></A
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93 ><P
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94 ></P
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95 ><PRE
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96 CLASS="FUNCSYNOPSISINFO"
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97 >#include "SDL.h"</PRE
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98 ><P
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99 ><CODE
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100 ><CODE
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101 CLASS="FUNCDEF"
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102 >int <B
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103 CLASS="FSFUNC"
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104 >SDL_SetGammaRamp</B
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105 ></CODE
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106 >(Uint16 *redtable, Uint16 *greentable, Uint16 *bluetable);</CODE
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107 ></P
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108 ><P
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109 ></P
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110 ></DIV
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111 ></DIV
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112 ><DIV
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113 CLASS="REFSECT1"
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114 ><A
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115 NAME="AEN1177"
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116 ></A
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117 ><H2
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118 >Description</H2
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119 ><P
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120 >Sets the gamma lookup tables for the display for each color component.
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121 Each table is an array of 256 Uint16 values, representing a mapping
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122 between the input and output for that channel. The input is the index
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123 into the array, and the output is the 16-bit gamma value at that index,
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124 scaled to the output color precision. You may pass NULL to any of the
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125 channels to leave them unchanged.</P
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126 ><P
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127 >This function adjusts the gamma based on lookup tables, you can also
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128 have the gamma calculated based on a "gamma function" parameter with
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129 <A
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130 HREF="sdlsetgamma.html"
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131 >SDL_SetGamma</A
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132 >.</P
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133 ><P
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134 >Not all display hardware is able to change gamma.</P
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135 ></DIV
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136 ><DIV
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137 CLASS="REFSECT1"
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138 ><A
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139 NAME="AEN1183"
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140 ></A
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141 ><H2
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142 >Return Value</H2
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143 ><P
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144 >Returns -1 on error (or if gamma adjustment is not supported).</P
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145 ></DIV
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146 ><DIV
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147 CLASS="REFSECT1"
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148 ><A
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149 NAME="AEN1186"
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150 ></A
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151 ><H2
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152 >See Also</H2
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153 ><P
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154 ><A
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155 HREF="sdlsetgamma.html"
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156 >SDL_SetGamma</A
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157 >
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158 <A
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159 HREF="sdlgetgammaramp.html"
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160 >SDL_GetGammaRamp</A
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161 ></P
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162 ></DIV
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163 ><DIV
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164 CLASS="NAVFOOTER"
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165 ><HR
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166 ALIGN="LEFT"
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167 WIDTH="100%"><TABLE
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168 WIDTH="100%"
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169 BORDER="0"
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170 CELLPADDING="0"
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171 CELLSPACING="0"
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172 ><TR
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173 ><TD
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174 WIDTH="33%"
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175 ALIGN="left"
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176 VALIGN="top"
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177 ><A
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178 HREF="sdlgetgammaramp.html"
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179 >Prev</A
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180 ></TD
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181 ><TD
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182 WIDTH="34%"
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183 ALIGN="center"
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184 VALIGN="top"
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185 ><A
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186 HREF="index.html"
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187 >Home</A
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188 ></TD
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189 ><TD
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190 WIDTH="33%"
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191 ALIGN="right"
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192 VALIGN="top"
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193 ><A
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194 HREF="sdlmaprgb.html"
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195 >Next</A
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196 ></TD
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197 ></TR
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198 ><TR
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199 ><TD
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200 WIDTH="33%"
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201 ALIGN="left"
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202 VALIGN="top"
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203 >SDL_GetGammaRamp</TD
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204 ><TD
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205 WIDTH="34%"
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206 ALIGN="center"
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207 VALIGN="top"
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208 ><A
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209 HREF="video.html"
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210 >Up</A
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211 ></TD
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212 ><TD
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213 WIDTH="33%"
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214 ALIGN="right"
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215 VALIGN="top"
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216 >SDL_MapRGB</TD
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217 ></TR
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218 ></TABLE
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219 ></DIV
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220 ></BODY
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221 ></HTML
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222 > |
