223 lines
3.0 KiB
HTML
223 lines
3.0 KiB
HTML
<HTML
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><HEAD
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><TITLE
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>SDL_SetGamma</TITLE
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NAME="GENERATOR"
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CONTENT="Modular DocBook HTML Stylesheet Version 1.64
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>SDL Library Documentation</TH
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><H1
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><A
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NAME="SDLSETGAMMA"
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>SDL_SetGamma</A
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></H1
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><DIV
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CLASS="REFNAMEDIV"
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><A
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NAME="AEN1154"
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></A
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><H2
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>Name</H2
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>SDL_SetGamma -- Sets the color gamma function for the display</DIV
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><DIV
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CLASS="REFSYNOPSISDIV"
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><A
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NAME="AEN1157"
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></A
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><H2
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>Synopsis</H2
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><DIV
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CLASS="FUNCSYNOPSIS"
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><A
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NAME="AEN1158"
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></A
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><P
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></P
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><PRE
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CLASS="FUNCSYNOPSISINFO"
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>#include "SDL.h"</PRE
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><P
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><CODE
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><CODE
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CLASS="FUNCDEF"
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>int <B
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CLASS="FSFUNC"
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>SDL_SetGamma</B
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></CODE
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>(float redgamma, float greengamma, float bluegamma);</CODE
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></P
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><P
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></P
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><DIV
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CLASS="REFSECT1"
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><A
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NAME="AEN1164"
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></A
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><H2
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>Description</H2
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><P
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>Sets the "gamma function" for the display of each color component. Gamma
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controls the brightness/contrast of colors displayed on the screen.
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A gamma value of <TT
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CLASS="CONSTANT"
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>1.0</TT
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> is identity (i.e., no adjustment
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is made).</P
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><P
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>This function adjusts the gamma based on the "gamma function" parameter,
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you can directly specify lookup tables for gamma adjustment with
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<A
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HREF="sdlsetgammaramp.html"
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>SDL_SetGammaRamp</A
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>.</P
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><P
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>Not all display hardware is able to change gamma.</P
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></DIV
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><DIV
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CLASS="REFSECT1"
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><A
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NAME="AEN1171"
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></A
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><H2
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>Return Value</H2
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><P
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>Returns -1 on error (or if gamma adjustment is not supported).</P
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></DIV
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><DIV
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CLASS="REFSECT1"
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><A
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NAME="AEN1174"
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></A
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><H2
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>See Also</H2
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><P
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><A
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HREF="sdlgetgammaramp.html"
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>SDL_GetGammaRamp</A
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>
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<A
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HREF="sdlsetgammaramp.html"
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>SDL_SetGammaRamp</A
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></P
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