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annotate docs/man3/SDL_SetGammaRamp.3 @ 4145:f00b6b19d57e SDL-1.2

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Date: Sat, 5 Apr 2008 19:54:28 -0700 From: "Chris Peterson" To: sdl@lists.libsdl.org Subject: [SDL] [PATCH] SDLMain.m: fix a bug and some warnings for Mac OS X Here are some small fixes for the src/main/macosx/SDLMain.m source file used by Mac OS X apps: 1. setupWorkingDirectory() called chdir() within an assert(), which gets compiled out in non-debug builds. 2. When some of gcc's optional warnings are enabled, it complains about some implicit casts and the use of #import in SDLMain.m.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 13 Apr 2008 04:50:17 +0000
parents 4e3b250c950e
children 1238da4a7112
rev   line source
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1 .TH "SDL_SetGammaRamp" "3" "Tue 11 Sep 2001, 23:01" "SDL" "SDL API Reference"
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2 .SH "NAME"
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3 SDL_SetGammaRamp \- Sets the color gamma lookup tables for the display
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4 .SH "SYNOPSIS"
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5 .PP
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6 \fB#include "SDL\&.h"
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7 .sp
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8 \fBint \fBSDL_SetGammaRamp\fP\fR(\fBUint16 *redtable, Uint16 *greentable, Uint16 *bluetable\fR);
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9 .SH "DESCRIPTION"
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10 .PP
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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\&.
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12 .PP
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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\&.
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14 .PP
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15 Not all display hardware is able to change gamma\&.
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16 .SH "RETURN VALUE"
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17 .PP
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18 Returns -1 on error (or if gamma adjustment is not supported)\&.
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19 .SH "SEE ALSO"
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20 .PP
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21 \fISDL_SetGamma\fR \fISDL_GetGammaRamp\fR
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22 ...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 23:01