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230 lines
3.3 KiB
230 lines
3.3 KiB
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>SDL_SetGammaRamp</TITLE |
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>SDL Library Documentation</TH |
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><H1 |
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><A |
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NAME="SDLSETGAMMARAMP" |
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></A |
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>SDL_SetGammaRamp</H1 |
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><DIV |
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CLASS="REFNAMEDIV" |
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><A |
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NAME="AEN1624" |
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><H2 |
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>Name</H2 |
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>SDL_SetGammaRamp -- Sets the color gamma lookup tables for the display</DIV |
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>Synopsis</H2 |
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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_SetGammaRamp</B |
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></CODE |
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>(Uint16 *redtable, Uint16 *greentable, Uint16 *bluetable);</CODE |
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><A |
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NAME="AEN1634" |
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><H2 |
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>Description</H2 |
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><P |
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>Sets the gamma lookup tables for the display for each color component. |
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Each table is an array of 256 Uint16 values, representing a mapping |
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between the input and output for that channel. The input is the index |
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into the array, and the output is the 16-bit gamma value at that index, |
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scaled to the output color precision. You may pass NULL to any of the |
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channels to leave them unchanged.</P |
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><P |
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>This function adjusts the gamma based on lookup tables, you can also |
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have the gamma calculated based on a "gamma function" parameter with |
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<A |
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HREF="sdlsetgamma.html" |
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>SDL_SetGamma</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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><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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><A |
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NAME="AEN1643" |
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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="sdlsetgamma.html" |
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>SDL_SetGamma</A |
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> |
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<A |
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HREF="sdlgetgammaramp.html" |
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>SDL_GetGammaRamp</A |
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>SDL_GetGammaRamp</TD |
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