blob: 52bf9f59143a80b7c7e6c875899a5d1e716e49a8 [file] [log] [blame]
.TH "SDL_SetGammaRamp" "3" "Tue 11 Sep 2001, 23:01" "SDL" "SDL API Reference"
SDL_SetGammaRamp \- Sets the color gamma lookup tables for the display
\fB#include "SDL\&.h"
\fBint \fBSDL_SetGammaRamp\fP\fR(\fBUint16 *redtable, Uint16 *greentable, Uint16 *bluetable\fR);
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\&.
This function adjusts the gamma based on lookup tables, you can also have the gamma calculated based on a "gamma function" parameter with \fISDL_SetGamma\fR\&.
Not all display hardware is able to change gamma\&.
Returns -1 on error (or if gamma adjustment is not supported)\&.
\fISDL_SetGamma\fR \fISDL_GetGammaRamp\fR
.\" created by instant / docbook-to-man, Tue 11 Sep 2001, 23:01