Manual Pages for UNIX Operating System command usage for man SDL_SetGammaRamp

SDL API Reference                             SDL_SetGammaRamp(3)



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 out-
     put 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 func-
     tion" 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  sup-
     ported).

SEE ALSO
     SDL_SetGamma SDL_GetGammaRamp
























SDL            Last change: Tue 11 Sep 2001, 23:01              1