Mercurial > sdl-ios-xcode
diff docs/man3/SDL_SetGammaRamp.3 @ 0:74212992fb08
Initial revision
author | Sam Lantinga <slouken@lokigames.com> |
---|---|
date | Thu, 26 Apr 2001 16:45:43 +0000 |
parents | |
children | 55f1f1b3e27d |
line wrap: on
line diff
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/docs/man3/SDL_SetGammaRamp.3 Thu Apr 26 16:45:43 2001 +0000 @@ -0,0 +1,22 @@ +.TH "SDL_SetGammaRamp" "3" "Mon 12 Mar 2001, 01:04" "SDL" "SDL API Reference" +.SH "NAME" +SDL_SetGammaRamp\- Sets the color gamma lookup tables for the display +.SH "SYNOPSIS" +.PP +\fB#include "SDL\&.h" +.sp +\fBint \fBSDL_SetGammaRamp\fP\fR(\fBUint16 *redtable, Uint16 *greentable, Uint16 *bluetable\fR); +.SH "DESCRIPTION" +.PP +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\&. +.PP +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\&. +.PP +Not all display hardware is able to change gamma\&. +.SH "RETURN VALUE" +.PP +Returns -1 on error (or if gamma adjustment is not supported)\&. +.SH "SEE ALSO" +.PP +\fISDL_SetGamma\fR \fISDL_GetGammaRamp\fR +...\" created by instant / docbook-to-man, Mon 12 Mar 2001, 01:04