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| NAME="AEN1209" |
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| ><H2 |
| >Name</H2 |
| >SDL_SetGammaRamp -- Sets the color gamma lookup tables for the display</DIV |
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| >Synopsis</H2 |
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| ><PRE |
| CLASS="FUNCSYNOPSISINFO" |
| >#include "SDL.h"</PRE |
| ><P |
| ><CODE |
| ><CODE |
| CLASS="FUNCDEF" |
| >int <B |
| CLASS="FSFUNC" |
| >SDL_SetGammaRamp</B |
| ></CODE |
| >(Uint16 *redtable, Uint16 *greentable, Uint16 *bluetable);</CODE |
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| >Description</H2 |
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| >Sets the gamma lookup tables for the display for each color component. |
| Each table is an array of 256 Uint16 values, representing a mapping |
| between the input and output for that channel. The input is the index |
| into the array, and the output is the 16-bit gamma value at that index, |
| scaled to the output color precision. You may pass NULL to any of the |
| channels to leave them unchanged.</P |
| ><P |
| >This function adjusts the gamma based on lookup tables, you can also |
| have the gamma calculated based on a "gamma function" parameter with |
| <A |
| HREF="sdlsetgamma.html" |
| >SDL_SetGamma</A |
| >.</P |
| ><P |
| >Not all display hardware is able to change gamma.</P |
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| ><H2 |
| >Return Value</H2 |
| ><P |
| >Returns -1 on error (or if gamma adjustment is not supported).</P |
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| >See Also</H2 |
| ><P |
| ><A |
| HREF="sdlsetgamma.html" |
| >SDL_SetGamma</A |
| > |
| <A |
| HREF="sdlgetgammaramp.html" |
| >SDL_GetGammaRamp</A |
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