SDL_SetSurfaceColorKey - Man Page

#include <SDL3/SDL_surface.h>

bool SDL_SetSurfaceColorKey(SDL_Surface *surface, bool enabled, Uint32 key);

The color key defines a pixel value that will be treated as transparent in a blit. For example, one can use this to specify that cyan pixels should be considered transparent, and therefore not rendered.

It is a pixel of the format used by the surface, as generated by SDL_MapRGB().

surface

the SDL_Surface structure to update.

enabled

true to enable color key, false to disable color key.

key

the transparent pixel.

for more information.

This function is not thread safe.

This function is available since SDL 3.2.0.

SDL_GetSurfaceColorKey(3), SDL_SetSurfaceRLE(3), SDL_SurfaceHasColorKey(3)

SDL_GetSurfaceColorKey(3), SDL_SurfaceHasColorKey(3).