symbian-qemu-0.9.1-12/libsdl-trunk/docs/man3/SDL_SetGammaRamp.3
author johnathan.white@2718R8BGH51.accenture.com
Mon, 08 Mar 2010 18:45:03 +0000
changeset 46 b6935a90ca64
parent 1 2fb8b9db1c86
permissions -rw-r--r--
Modify framebuffer and NGA framebuffer to read screen size from board model dtb file. Optimise memory usuage of frame buffer Add example minigui application with hooks to profiler (which writes results to S:\). Modified NGA framebuffer to run its own dfc queue at high priority
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.TH "SDL_SetGammaRamp" "3" "Tue 11 Sep 2001, 23:01" "SDL" "SDL API Reference" 
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.SH "NAME"
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SDL_SetGammaRamp \- Sets the color gamma lookup tables for the display
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.SH "SYNOPSIS"
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.PP
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\fB#include "SDL\&.h"
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.sp
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\fBint \fBSDL_SetGammaRamp\fP\fR(\fBUint16 *redtable, Uint16 *greentable, Uint16 *bluetable\fR);
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.SH "DESCRIPTION"
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.PP
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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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.PP
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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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.PP
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Not all display hardware is able to change gamma\&.
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.SH "RETURN VALUE"
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.PP
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Returns -1 on error (or if gamma adjustment is not supported)\&.
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.SH "SEE ALSO"
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.PP
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\fISDL_SetGamma\fR \fISDL_GetGammaRamp\fR
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...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 23:01