Struct PaintTimingHandler 

pub(crate) struct PaintTimingHandler {
    viewport_rect: LayoutRect,
    lcp_size: f32,
    lcp_next_uuid: u64,
    lcp_candidate: Option<LCPCandidate>,
    lcp_candidate_updated: bool,
    reported_image_nodes: HashSet<OpaqueNode>,
    painted_images: Vec<PendingImageRecord>,
    reported_text_nodes: HashSet<OpaqueNode>,
    painted_text_nodes: HashMap<OpaqueNode, TextRecord>,
}

Fields

viewport_rect: LayoutRect

The rect of viewport.

lcp_size: f32

The document’s largest contentful paint size

lcp_next_uuid: u64

Counter for generating unique LCP candidate UUIDs.

lcp_candidate: Option<LCPCandidate>

The LCP candidate, it may be a image or text.

lcp_candidate_updated: bool

Flag to indicate if there is an update to LCP candidate. This is used to avoid sending duplicate LCP candidates to Paint.

reported_image_nodes: HashSet<OpaqueNode>

The set of image nodes that have been reported as LCP candidates.

painted_images: Vec<PendingImageRecord>

https://w3c.github.io/paint-timing/#paintedImages

reported_text_nodes: HashSet<OpaqueNode>

The set of text nodes that have been reported as LCP candidates.

painted_text_nodes: HashMap<OpaqueNode, TextRecord>

https://w3c.github.io/paint-timing/#paintedTextNodes

Implementations

impl PaintTimingHandler

pub(crate) fn new(viewport_size: LayoutSize) -> Self

pub(crate) fn append_image_record( &mut self, tag: Option<Tag>, bounds: LayoutRect, clip_rect: LayoutRect, transform: FastLayoutTransform, url: Option<ServoUrl>, natural_width: Option<Au>, natural_height: Option<Au>, )

pub(crate) fn accumulate_text_rect( &mut self, tag: Tag, rect: LayoutRect, transform: FastLayoutTransform, )

pub(crate) fn check_bounding_rect( &self, bounds: LayoutRect, clip_rect: LayoutRect, ) -> bool

fn effective_visual_size( &self, intersection_rect: LayoutRect, candidate_type: LCPCandidateType<'_>, ) -> Option<f32>

https://www.w3.org/TR/largest-contentful-paint/#sec-effective-visual-size

fn compute_new_lcp_candidate(&mut self)

https://www.w3.org/TR/largest-contentful-paint/#compute-a-new-largest-contentful-paint-candidate

fn report_largest_contentful_paint(&mut self, halt_lcp: bool)

https://www.w3.org/TR/largest-contentful-paint/#sec-report-largest-contentful-paint

pub(crate) fn mark_paint_timing(&mut self, halt_lcp: bool)

https://www.w3.org/TR/paint-timing/#mark-paint-timing

pub(crate) fn did_lcp_candidate_update(&self) -> bool

pub(crate) fn unset_lcp_candidate_updated(&mut self)

pub(crate) fn largest_contentful_paint_candidate(&self) -> Option<LCPCandidate>