the window to query the width and height from.
a pointer filled in with the width of the window, may be NULL.
a pointer filled in with the height of the window, may be NULL.
true on success or false on failure; call SDL_GetError() for more information.
Threadsafety: This function should only be called on the main thread.
SDL_GetRenderOutputSize SDL_GetWindowSizeInPixels SDL_SetWindowSize
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Get the size of a window's client area.
The window pixel size may differ from its window coordinate size if the window is on a high pixel density display. Use SDL_GetWindowSizeInPixels() or SDL_GetRenderOutputSize() to get the real client area size in pixels.