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view docs/man3/SDL_SetGammaRamp.3 @ 4254:8afecb86be35 SDL-1.2

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Fixed bug #616 rainer canavan 2009-03-29 12:30:12 PDT add default visual to this->hidden->visuals X11_SetIcon appears to have problems getting the correct bpp for the default visual of my screen. With larger icons, this causes a segfault somewhere in libX11. Instead of adding the default visual to the internal list, I can work around this problem (both the segfault and the distortion) by setting bpp to 32 before sicon = SDL_CreateRGBSurface(...) in X11_SetIcon, although with this patch, it stays at 24.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 27 Sep 2009 22:41:34 +0000
parents 4e3b250c950e
children 1238da4a7112
line wrap: on
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.TH "SDL_SetGammaRamp" "3" "Tue 11 Sep 2001, 23:01" "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, Tue 11 Sep 2001, 23:01