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 +2563=16777216 colors.
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.
/* 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\n", SDL_GetError());
+ exit(-1);
+ }
+
+ /* Set palette */
+ SDL_SetPalette(screen, SDL_LOGPAL|SDL_PHYSPAL, colors, 0, 256);
+ .
+ .
+ .
+ .