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CentOS 7.0 - man page for sdl_setcolors (centos section 3)

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SDL_SetColors(3)			SDL API Reference			 SDL_SetColors(3)

NAME
       SDL_SetColors - Sets a portion of the colormap for the given 8-bit surface.

SYNOPSIS
       #include "SDL.h"

       int SDL_SetColors(SDL_Surface *surface, SDL_Color *colors, int firstcolor, int ncolors);

DESCRIPTION
       Sets a portion of the colormap for the given 8-bit surface.

       When surface is the surface associated with the current display, the display colormap will
       be updated with the requested colors. If SDL_HWPALETTE was set in SDL_SetVideoMode  flags,
       SDL_SetColors  will  always  return 1, and the palette is guaranteed to be set the way you
       desire, even if the window colormap has to be warped or run under emulation.

       The color components of a SDL_Color structure are 8-bits in size, giving you  a	total  of
       256^3 =16777216 colors.

       Palettized  (8-bit) screen surfaces with the SDL_HWPALETTE flag have two palettes, a logi-
       cal palette that is used for mapping blits to/from the  surface	and  a	physical  palette
       (that determines how the hardware will map the colors to the display). SDL_SetColors modi-
       fies both palettes (if present), and is equivalent  to  calling	SDL_SetPalette	with  the
       flags set to (SDL_LOGPAL | SDL_PHYSPAL).

RETURN VALUE
       If surface is not a palettized surface, this function does nothing, returning 0. If all of
       the colors were set as passed to SDL_SetColors, it will return 1. If  not  all  the  color
       entries	were  set  exactly as given, it will return 0, and you should look at the surface
       palette to determine the actual color palette.

EXAMPLE
       /* Create a display surface with a grayscale palette */
       SDL_Surface *screen;
       SDL_Color colors[256];
       int i;
       .
       .
       .
       /* Fill colors with color information */
       for(i=0;i<256;i++){
	 colors[i].r=i;
	 colors[i].g=i;
	 colors[i].b=i;
       }

       /* Create display */
       screen=SDL_SetVideoMode(640, 480, 8, SDL_HWPALETTE);
       if(!screen){
	 printf("Couldn't set video mode: %s
       ", SDL_GetError());
	 exit(-1);
       }

       /* Set palette */
       SDL_SetColors(screen, colors, 0, 256);
       .
       .
       .
       .

SEE ALSO
       SDL_Color SDL_Surface, SDL_SetPalette, SDL_SetVideoMode

SDL				      Tue 11 Sep 2001, 23:01			 SDL_SetColors(3)


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