SDL_GetWindowBordersSize - Get the size of a window's borders (decorations) around the client area.

       This function is available since SDL 3.2.0.

       Note:  If  this  function  fails (returns false), the size values will be initialized to 0, 0, 0, 0 (if a
       non-NULL pointer is provided), as if the window in question was borderless.

       Note: This function may fail on systems where the window has not yet been decorated by the display server
       (for example, immediately after calling

       SDL_CreateWindow ). It is recommended that you wait at least until the  window  has  been  presented  and
       composited,  so  that  the  window  system  has  a  chance  to decorate the window and provide the border
       dimensions to SDL.

       This function also returns false if getting the information is not supported.

window the window to query the size values of the border (decorations) from.

       top    pointer to variable for storing the size of the top border; NULL is permitted.

       left   pointer to variable for storing the size of the left border; NULL is permitted.

       bottom pointer to variable for storing the size of the bottom border; NULL is permitted.

       right  pointer to variable for storing the size of the right border; NULL is permitted.

       Defined in SDL3/SDL_video.h

       SDL_GetWindowBordersSize - Get the size of a window's borders (decorations) around the client area.

       Returns true on success or false on failure; call

       SDL_GetError () for more information.

•(3), SDL_GetWindowSize(3)

Simple Directmedia Layer                           SDL 3.2.10                        SDL_GetWindowBordersSize(3)

#include"SDL3/SDL.h"boolSDL_GetWindowBordersSize(SDL_Window*window,int*top,int*left,int*bottom,int*right);

       This function should only be called on the main thread.