sdl_setpalette — Sets the colors in the palette of an 8-bit surface.
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
The color components of a SDL_Color structure are 8-bits in size, giving you a total of 256^3 =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.