SDL_RenderReadPixels - Man Page

Defined in SDL3/SDL_render.h

#include "SDL3/SDL.h"

SDL_Surface * SDL_RenderReadPixels(SDL_Renderer *renderer, const SDL_Rect *rect);

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

This function should only be called on the main thread.

This function is available since SDL 3.2.0.