SDL_RenderReadPixels - Read pixels from the current rendering target.

       This function is available since SDL 3.2.0.

Simple Directmedia Layer                           SDL 3.2.20                            SDL_RenderReadPixels(3)

       The  returned surface contains pixels inside the desired area clipped to the current viewport, and should
       be freed with SDL_DestroySurface().

       Note that this returns the actual pixels on the screen, so if you  are  using  logical  presentation  you
       should use SDL_GetRenderLogicalPresentationRect() to get the area containing your content.

       WARNING:  This  is  a very slow operation, and should not be used frequently. If you're using this on the
       main rendering target, it should be called after rendering and before SDL_RenderPresent().

renderer
              the rendering context.

       rect   an SDL_Rect structure representing the area  to  read,  which  will  be  clipped  to  the  current
              viewport, or NULL for the entire viewport.

       SDL_RenderReadPixels - Read pixels from the current rendering target.

       Returns a new SDL_Surface on success or NULL on failure; call SDL_GetError() for more information.

#include<SDL3/SDL_render.h>SDL_Surface*SDL_RenderReadPixels(SDL_Renderer*renderer,constSDL_Rect*rect);

       This function should only be called on the main thread.