Linux Blog

SDL_SetGammaRamp

Section: SDL API Reference (3)
Updated: Tue 11 Sep 2001, 23:01
Index Return to Main Contents
 

NAME

SDL_SetGammaRamp- Sets the color gamma lookup tables for the display  

SYNOPSIS

#include "SDL.h"

int SDL_SetGammaRamp(Uint16 *redtable, Uint16 *greentable, Uint16 *bluetable);  

DESCRIPTION

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 SDL_SetGamma.

Not all display hardware is able to change gamma.  

RETURN VALUE

Returns -1 on error (or if gamma adjustment is not supported).  

SEE ALSO

SDL_SetGamma SDL_GetGammaRamp


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
SEE ALSO




Random Man Pages:
BIO_get_fp
pom
sane-sceptre
autofs