Method Shutdown

src/imgui/imgui.cpp:4319–4405

This function is merely here to free heap allocations.

// This function is merely here to free heap allocations.
void ImGui::Shutdown()
{
    ImGuiContext& g = *GImGui;
    IM_ASSERT_USER_ERROR(g.IO.BackendPlatformUserData == NULL, "Forgot to shutdown Platform backend?");
    IM_ASSERT_USER_ERROR(g.IO.BackendRendererUserData == NULL, "Forgot to shutdown Renderer backend?");

    // The fonts atlas can be used prior to calling NewFrame(), so we clear it even if g.Initialized is FALSE (which would happen if we never called NewFrame)
    for (ImFontAtlas* atlas : g.FontAtlases)
    {
        UnregisterFontAtlas(atlas);
        if (atlas->OwnerContext == &g)
        {
            atlas->Locked = false;
            IM_DELETE(atlas);
        }
    }
    g.DrawListSharedData.TempBuffer.clear();

    // Cleanup of other data are conditional on actually having initialized Dear ImGui.
    if (!g.Initialized)
        return;

    // Save settings (unless we haven't attempted to load them: CreateContext/DestroyContext without a call to NewFrame shouldn't save an empty file)
    if (g.SettingsLoaded && g.IO.IniFilename != NULL)
        SaveIniSettingsToDisk(g.IO.IniFilename);

    CallContextHooks(&g, ImGuiContextHookType_Shutdown);

    // Clear everything else
    g.Windows.clear_delete();
    g.WindowsFocusOrder.clear();
    g.WindowsTempSortBuffer.clear();
    g.CurrentWindow = NULL;
    g.CurrentWindowStack.clear();
    g.WindowsById.Clear();
    g.NavWindow = NULL;
    g.HoveredWindow = g.HoveredWindowUnderMovingWindow = NULL;
    g.ActiveIdWindow = NULL;
    g.MovingWindow = NULL;

    g.KeysRoutingTable.Clear();

    g.ColorStack.clear();
    g.StyleVarStack.clear();
    g.FontStack.clear();
    g.OpenPopupStack.clear();
    g.BeginPopupStack.clear();
    g.TreeNodeStack.clear();

    g.Viewports.clear_delete();

    g.TabBars.Clear();
    g.CurrentTabBarStack.clear();
    g.ShrinkWidthBuffer.clear();

    g.ClipperTempData.clear_destruct();

    g.Tables.Clear();