(This is the documentation for SDL3, which is the current stable version. SDL2 was the previous version!)

SDL_SetWindowSize

Request that the size of a window's client area be set.

Header File

Syntax

bool SDL_SetWindowSize(SDL_Window *window, int w, int h);

Function Parameters

SDL_Window *	window	the window to change.
int	w	the width of the window, must be > 0.
int	h	the height of the window, must be > 0.

Return Value

(bool) Returns true on success or false on failure; call SDL_GetError() for more information.

Remarks

If the window is in a fullscreen or maximized state, this request has no effect.

To change the exclusive fullscreen mode of a window, use SDL_SetWindowFullscreenMode().

On some windowing systems, this request is asynchronous and the new window size may not have have been applied immediately upon the return of this function. If an immediate change is required, call SDL_SyncWindow() to block until the changes have taken effect.

When the window size changes, an SDL_EVENT_WINDOW_RESIZED event will be emitted with the new window dimensions. Note that the new dimensions may not match the exact size requested, as some windowing systems can restrict the window size in certain scenarios (e.g. constraining the size of the content area to remain within the usable desktop bounds). Additionally, as this is just a request, it can be denied by the windowing system.

Thread Safety

This function should only be called on the main thread.

Version

This function is available since SDL 3.1.3.