Provided by: libsdl3-doc_3.2.8+ds-1_all 

NAME
SDL_ReadSurfacePixel - Retrieves a single pixel from a surface.
HEADER FILE
Defined in SDL3/SDL_surface.h
SYNOPSIS
#include "SDL3/SDL.h" bool SDL_ReadSurfacePixel(SDL_Surface *surface, int x, int y, Uint8 *r, Uint8 *g, Uint8 *b, Uint8 *a);
DESCRIPTION
This function prioritizes correctness over speed: it is suitable for unit tests, but is not intended for use in a game engine. Like SDL_GetRGBA , this uses the entire 0..255 range when converting color components from pixel formats with less than 8 bits per RGB component.
FUNCTION PARAMETERS
surface the surface to read. x the horizontal coordinate, 0 <= x < width. y the vertical coordinate, 0 <= y < height. r a pointer filled in with the red channel, 0-255, or NULL to ignore this channel. g a pointer filled in with the green channel, 0-255, or NULL to ignore this channel. b a pointer filled in with the blue channel, 0-255, or NULL to ignore this channel. a a pointer filled in with the alpha channel, 0-255, or NULL to ignore this channel.
RETURN VALUE
Returns true on success or false on failure; call SDL_GetError () for more information.
AVAILABILITY
This function is available since SDL 3.2.0. Simple Directmedia Layer SDL 3.2.8 SDL_ReadSurfacePixel(3)