comparison docs/man3/SDL_SetGammaRamp.3 @ 0:74212992fb08

Initial revision
author Sam Lantinga <slouken@lokigames.com>
date Thu, 26 Apr 2001 16:45:43 +0000
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1 .TH "SDL_SetGammaRamp" "3" "Mon 12 Mar 2001, 01:04" "SDL" "SDL API Reference"
2 .SH "NAME"
3 SDL_SetGammaRamp\- Sets the color gamma lookup tables for the display
4 .SH "SYNOPSIS"
5 .PP
6 \fB#include "SDL\&.h"
7 .sp
8 \fBint \fBSDL_SetGammaRamp\fP\fR(\fBUint16 *redtable, Uint16 *greentable, Uint16 *bluetable\fR);
9 .SH "DESCRIPTION"
10 .PP
11 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\&.
12 .PP
13 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\&.
14 .PP
15 Not all display hardware is able to change gamma\&.
16 .SH "RETURN VALUE"
17 .PP
18 Returns -1 on error (or if gamma adjustment is not supported)\&.
19 .SH "SEE ALSO"
20 .PP
21 \fISDL_SetGamma\fR \fISDL_GetGammaRamp\fR
22 ...\" created by instant / docbook-to-man, Mon 12 Mar 2001, 01:04