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SDL/SDL_SetPalette
NAME 

SDL_SetPalette- Sets the colors in the palette of an 8-bit surface.

SYNOPSIS 



#include "SDL.h"


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

DESCRIPTION 



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


Palettized (8-bit) screen surfaces with the SDL_HWPALETTE 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). SDL_BlitSurface always uses the logical palette when blitting
surfaces (if it has to convert between surface pixel formats). Because of this,
it is often useful to modify only one or the other palette to achieve various
special color effects (e.g., screen fading, color flashes, screen dimming).


This function can modify either the logical or physical palette by specifing
SDL_LOGPAL or SDL_PHYSPALthe in the flags parameter.


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_SetPalette 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.

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_SetPalette, 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_SetPalette(screen, SDL_LOGPAL|SDL_PHYSPAL, colors, 0, 256);
        .
        .
        .
        .




SEE ALSO 



SDL_SetColors, SDL_SetVideoMode, SDL_Surface, SDL_Color



Logo by Emeric/SH
SDL/SDL_SetPalette

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