Method Clear

src/imgui/imgui_draw.cpp:2248–2256

//-----------------------------------------------------------------------------

void ImDrawData::Clear()
{
    Valid = false;
    CmdListsCount = TotalIdxCount = TotalVtxCount = 0;
    CmdLists.resize(0); // The ImDrawList are NOT owned by ImDrawData but e.g. by ImGuiContext, so we don't clear them.
    DisplayPos = DisplaySize = FramebufferScale = ImVec2(0.0f, 0.0f);
    OwnerViewport = NULL;
    Textures = NULL;
}

// Important: 'out_list' is generally going to be draw_data->CmdLists, but may be another temporary list
// as long at it is expected that the result will be later merged into draw_data->CmdLists[].