.TH "SDL_SetColors" "3" "Tue 11 Sep 2001, 23:01" "SDL" "SDL API Reference"

.SH "NAME"

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

.SH "SYNOPSIS"

.PP

\fB#include "SDL\&.h"

.sp

\fBint \fBSDL_SetColors\fP\fR(\fBSDL_Surface *surface, SDL_Color *colors, int firstcolor, int ncolors\fR);

.SH "DESCRIPTION"

.PP

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

.PP

When \fBsurface\fR is the surface associated with the current display, the display colormap will be updated with the requested colors\&. If \fBSDL_HWPALETTE\fP was set in \fISDL_SetVideoMode\fR flags, \fBSDL_SetColors\fP will always return \fB1\fR, 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\&.

.PP

The color components of a \fI\fBSDL_Color\fR\fR structure are 8-bits in size, giving you a total of 256^3 =16777216 colors\&.

.PP

Palettized (8-bit) screen surfaces with the \fBSDL_HWPALETTE\fP flag have two palettes, a logical 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)\&. \fBSDL_SetColors\fP modifies both palettes (if present), and is equivalent to calling \fISDL_SetPalette\fR with the \fBflags\fR set to \fB(SDL_LOGPAL | SDL_PHYSPAL)\fP\&.

.SH "RETURN VALUE"

.PP

If \fBsurface\fR is not a palettized surface, this function does nothing, returning \fB0\fR\&. If all of the colors were set as passed to \fBSDL_SetColors\fP, it will return \fB1\fR\&. If not all the color entries were set exactly as given, it will return \fB0\fR, and you should look at the surface palette to determine the actual color palette\&.

.SH "EXAMPLE"

.PP

.nf

\f(CW/* 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);

\&.

\&.

\&.

\&.\fR

.fi

.PP

.SH "SEE ALSO"

.PP

\fI\fBSDL_Color\fR\fR \fI\fBSDL_Surface\fR\fR, \fI\fBSDL_SetPalette\fP\fR, \fI\fBSDL_SetVideoMode\fP\fR

...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 23:01