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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="SDLSETGAMMARAMP" |
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74 ></A |
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75 >SDL_SetGammaRamp</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="AEN1624" |
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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_SetGammaRamp -- Sets the color gamma lookup tables for the display</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="AEN1627" |
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90 >Synopsis</H2 |
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94 NAME="AEN1628" |
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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_SetGammaRamp</B |
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108 ></CODE |
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109 >(Uint16 *redtable, Uint16 *greentable, Uint16 *bluetable);</CODE |
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110 ></P |
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111 ><P |
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118 NAME="AEN1634" |
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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 the gamma lookup tables for the display for each color component. |
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124 Each table is an array of 256 Uint16 values, representing a mapping |
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125 between the input and output for that channel. The input is the index |
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126 into the array, and the output is the 16-bit gamma value at that index, |
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127 scaled to the output color precision. You may pass NULL to any of the |
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128 channels to leave them unchanged.</P |
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129 ><P |
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130 >This function adjusts the gamma based on lookup tables, you can also |
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131 have the gamma calculated based on a "gamma function" parameter with |
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132 <A |
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133 HREF="sdlsetgamma.html" |
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134 >SDL_SetGamma</A |
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135 >.</P |
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136 ><P |
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137 >Not all display hardware is able to change gamma.</P |
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140 CLASS="REFSECT1" |
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141 ><A |
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142 NAME="AEN1640" |
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143 ></A |
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144 ><H2 |
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145 >Return Value</H2 |
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146 ><P |
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147 >Returns -1 on error (or if gamma adjustment is not supported).</P |
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149 ><DIV |
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150 CLASS="REFSECT1" |
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151 ><A |
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152 NAME="AEN1643" |
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153 ></A |
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154 ><H2 |
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155 >See Also</H2 |
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156 ><P |
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157 ><A |
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158 HREF="sdlsetgamma.html" |
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159 >SDL_SetGamma</A |
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160 > |
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161 <A |
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162 HREF="sdlgetgammaramp.html" |
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163 >SDL_GetGammaRamp</A |
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164 ></P |
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