GSP
Quick Navigator

Search Site

Unix VPS
A - Starter
B - Basic
C - Preferred
D - Commercial
MPS - Dedicated
Previous VPSs
* Sign Up! *

Support
Contact Us
Online Help
Handbooks
Domain Status
Man Pages

FAQ
Virtual Servers
Pricing
Billing
Technical

Network
Facilities
Connectivity
Topology Map

Miscellaneous
Server Agreement
Year 2038
Credits
 

USA Flag

 

 

Man Pages


Manual Reference Pages  -  SDL_SETPALETTE (3)

NAME

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

CONTENTS

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

Search for    or go to Top of page |  Section 3 |  Main Index


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

Powered by GSP Visit the GSP FreeBSD Man Page Interface.
Output converted with manServer 1.07.