the surface to write.
the horizontal coordinate, 0 <= x < width.
the vertical coordinate, 0 <= y < height.
the red channel value, normally in the range 0-1.
the green channel value, normally in the range 0-1.
the blue channel value, normally in the range 0-1.
the alpha channel value, normally in the range 0-1.
true on success or false on failure; call SDL_GetError() for more information.
Writes a single pixel to a surface.
This function prioritizes correctness over speed: it is suitable for unit tests, but is not intended for use in a game engine.