Function glfwGetFramebufferSize 

pub unsafe extern "C" fn glfwGetFramebufferSize(
    window: *mut GLFWwindow,
    width: *mut i32,
    height: *mut i32,
)

@brief Retrieves the size of the framebuffer of the specified window.

This function retrieves the size, in pixels, of the framebuffer of the specified window. If you wish to retrieve the size of the window in screen coordinates, see @ref glfwGetWindowSize.

Any or all of the size arguments may be NULL. If an error occurs, all non-NULL size arguments will be set to zero.

@param[in] window The window whose framebuffer to query. @param[out] width Where to store the width, in pixels, of the framebuffer, or NULL. @param[out] height Where to store the height, in pixels, of the framebuffer, or NULL.

@errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref GLFW_PLATFORM_ERROR.

@thread_safety This function must only be called from the main thread.

@sa @ref window_fbsize @sa @ref glfwSetFramebufferSizeCallback

@since Added in version 3.0.

@ingroup window