pub unsafe extern "C" fn glfwSetWindowContentScaleCallback(
window: *mut GLFWwindow,
callback: Option<unsafe extern "C" fn(*mut GLFWwindow, f32, f32)>,
) -> Option<unsafe extern "C" fn(*mut GLFWwindow, f32, f32)>Expand description
@brief Sets the window content scale callback for the specified window.
This function sets the window content scale callback of the specified window, which is called when the content scale of the specified window changes.
@param[in] window The window whose callback to set.
@param[in] callback The new callback, or NULL to remove the currently set
callback.
@return The previously set callback, or NULL if no callback was set or the
library had not been [initialized](@ref intro_init).
@callback_signature @code void function_name(GLFWwindow* window, float xscale, float yscale) @endcode For more information about the callback parameters, see the [function pointer type](@ref GLFWwindowcontentscalefun).
@errors Possible errors include @ref GLFW_NOT_INITIALIZED.
@thread_safety This function must only be called from the main thread.
@sa @ref window_scale @sa @ref glfwGetWindowContentScale
@since Added in version 3.3.
@ingroup window