The window whose size to retrieve.
Where to store the width, in screen coordinates, of the content area, or null.
Where to store the height, in screen coordinates, of the content area, or null.
Errors: Possible errors include @ref GLFW_NOT_INITIALIZED and @ref GLFW_PLATFORM_ERROR.
This function must only be called from the main thread.
@sa @ref window_size @sa @ref glfwSetWindowSize
Added in version 1.0. @glfw3 Added window handle parameter.
Ingroup: window
Retrieves the size of the content area of the specified window.
This function retrieves the size, in screen coordinates, of the content area of the specified window. If you wish to retrieve the size of the framebuffer of the window in pixels, see @ref glfwGetFramebufferSize.
Any or all of the size arguments may be null. If an error occurs, all non-null size arguments will be set to zero.