Function add_fonts_and_images

pub fn add_fonts_and_images<U: FontImageApi>(
    app_resources: &mut AppResources,
    render_api: &mut U,
    pipeline_id: &PipelineId,
    display_list: &DisplayList,
    node_data: &NodeDataContainer<NodeData>,
    load_font_fn: LoadFontFn,
    load_image_fn: LoadImageFn,
)

Scans the DisplayList for new images and fonts. After this call, the RenderApi is guaranteed to know about all FontKeys and FontInstanceKey