Mercurial > sdl-ios-xcode
comparison docs/man3/SDL_SetGammaRamp.3 @ 0:74212992fb08
Initial revision
| author | Sam Lantinga <slouken@lokigames.com> |
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| date | Thu, 26 Apr 2001 16:45:43 +0000 |
| parents | |
| children | 55f1f1b3e27d |
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| -1:000000000000 | 0:74212992fb08 |
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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 |