Mercurial > sdl-ios-xcode
view docs/man3/SDL_SetGamma.3 @ 481:c96e2137f9eb
Date: Sat, 31 Aug 2002 15:42:45 +0200
From: Alexandre Courbot
Subject: [SDL] Qtopia port fixes/improvments
-Whenever the screen is rotated, the pad is rotated as well,
-Fixed a mouse bug: when tapping on the screen, the click event was
often sent at the previous position of the stylus (resulting in strange
behavior in Scummvm for instance)
-Added the SDL_QT_INVERT_ROTATION environment variable which, when set,
rotates the screen (and the mouse, and the pad) the other way. This can
be useful for left-handed people.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sun, 01 Sep 2002 00:37:24 +0000 |
| parents | e5bc29de3f0a |
| children | 546f7c1eb755 |
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.TH "SDL_SetGamma" "3" "Tue 11 Sep 2001, 23:01" "SDL" "SDL API Reference" .SH "NAME" SDL_SetGamma\- Sets the color gamma function for the display .SH "SYNOPSIS" .PP \fB#include "SDL\&.h" .sp \fBint \fBSDL_SetGamma\fP\fR(\fBfloat redgamma, float greengamma, float bluegamma\fR); .SH "DESCRIPTION" .PP Sets the "gamma function" for the display of each color component\&. Gamma controls the brightness/contrast of colors displayed on the screen\&. A gamma value of 1\&.0 is identity (i\&.e\&., no adjustment is made)\&. .PP This function adjusts the gamma based on the "gamma function" parameter, you can directly specify lookup tables for gamma adjustment with \fISDL_SetGammaRamp\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_GetGammaRamp\fR \fISDL_SetGammaRamp\fR ...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 23:01