| <HTML |
| ><HEAD |
| ><TITLE |
| >SDL_SetGammaRamp</TITLE |
| ><META |
| NAME="GENERATOR" |
| CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+ |
| "><LINK |
| REL="HOME" |
| TITLE="SDL Library Documentation" |
| HREF="index.html"><LINK |
| REL="UP" |
| TITLE="Video" |
| HREF="video.html"><LINK |
| REL="PREVIOUS" |
| TITLE="SDL_GetGammaRamp" |
| HREF="sdlgetgammaramp.html"><LINK |
| REL="NEXT" |
| TITLE="SDL_MapRGB" |
| HREF="sdlmaprgb.html"></HEAD |
| ><BODY |
| CLASS="REFENTRY" |
| BGCOLOR="#FFF8DC" |
| TEXT="#000000" |
| LINK="#0000ee" |
| VLINK="#551a8b" |
| ALINK="#ff0000" |
| ><DIV |
| CLASS="NAVHEADER" |
| ><TABLE |
| SUMMARY="Header navigation table" |
| WIDTH="100%" |
| BORDER="0" |
| CELLPADDING="0" |
| CELLSPACING="0" |
| ><TR |
| ><TH |
| COLSPAN="3" |
| ALIGN="center" |
| >SDL Library Documentation</TH |
| ></TR |
| ><TR |
| ><TD |
| WIDTH="10%" |
| ALIGN="left" |
| VALIGN="bottom" |
| ><A |
| HREF="sdlgetgammaramp.html" |
| ACCESSKEY="P" |
| >Prev</A |
| ></TD |
| ><TD |
| WIDTH="80%" |
| ALIGN="center" |
| VALIGN="bottom" |
| ></TD |
| ><TD |
| WIDTH="10%" |
| ALIGN="right" |
| VALIGN="bottom" |
| ><A |
| HREF="sdlmaprgb.html" |
| ACCESSKEY="N" |
| >Next</A |
| ></TD |
| ></TR |
| ></TABLE |
| ><HR |
| ALIGN="LEFT" |
| WIDTH="100%"></DIV |
| ><H1 |
| ><A |
| NAME="SDLSETGAMMARAMP" |
| ></A |
| >SDL_SetGammaRamp</H1 |
| ><DIV |
| CLASS="REFNAMEDIV" |
| ><A |
| NAME="AEN1624" |
| ></A |
| ><H2 |
| >Name</H2 |
| >SDL_SetGammaRamp -- Sets the color gamma lookup tables for the display</DIV |
| ><DIV |
| CLASS="REFSYNOPSISDIV" |
| ><A |
| NAME="AEN1627" |
| ></A |
| ><H2 |
| >Synopsis</H2 |
| ><DIV |
| CLASS="FUNCSYNOPSIS" |
| ><A |
| NAME="AEN1628" |
| ></A |
| ><P |
| ></P |
| ><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 |
| ></P |
| ><P |
| ></P |
| ></DIV |
| ></DIV |
| ><DIV |
| CLASS="REFSECT1" |
| ><A |
| NAME="AEN1634" |
| ></A |
| ><H2 |
| >Description</H2 |
| ><P |
| >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 |
| ></DIV |
| ><DIV |
| CLASS="REFSECT1" |
| ><A |
| NAME="AEN1640" |
| ></A |
| ><H2 |
| >Return Value</H2 |
| ><P |
| >Returns -1 on error (or if gamma adjustment is not supported).</P |
| ></DIV |
| ><DIV |
| CLASS="REFSECT1" |
| ><A |
| NAME="AEN1643" |
| ></A |
| ><H2 |
| >See Also</H2 |
| ><P |
| ><A |
| HREF="sdlsetgamma.html" |
| >SDL_SetGamma</A |
| > |
| <A |
| HREF="sdlgetgammaramp.html" |
| >SDL_GetGammaRamp</A |
| ></P |
| ></DIV |
| ><DIV |
| CLASS="NAVFOOTER" |
| ><HR |
| ALIGN="LEFT" |
| WIDTH="100%"><TABLE |
| SUMMARY="Footer navigation table" |
| WIDTH="100%" |
| BORDER="0" |
| CELLPADDING="0" |
| CELLSPACING="0" |
| ><TR |
| ><TD |
| WIDTH="33%" |
| ALIGN="left" |
| VALIGN="top" |
| ><A |
| HREF="sdlgetgammaramp.html" |
| ACCESSKEY="P" |
| >Prev</A |
| ></TD |
| ><TD |
| WIDTH="34%" |
| ALIGN="center" |
| VALIGN="top" |
| ><A |
| HREF="index.html" |
| ACCESSKEY="H" |
| >Home</A |
| ></TD |
| ><TD |
| WIDTH="33%" |
| ALIGN="right" |
| VALIGN="top" |
| ><A |
| HREF="sdlmaprgb.html" |
| ACCESSKEY="N" |
| >Next</A |
| ></TD |
| ></TR |
| ><TR |
| ><TD |
| WIDTH="33%" |
| ALIGN="left" |
| VALIGN="top" |
| >SDL_GetGammaRamp</TD |
| ><TD |
| WIDTH="34%" |
| ALIGN="center" |
| VALIGN="top" |
| ><A |
| HREF="video.html" |
| ACCESSKEY="U" |
| >Up</A |
| ></TD |
| ><TD |
| WIDTH="33%" |
| ALIGN="right" |
| VALIGN="top" |
| >SDL_MapRGB</TD |
| ></TR |
| ></TABLE |
| ></DIV |
| ></BODY |
| ></HTML |
| > |
