Struct PaintedRegion 

pub(crate) struct PaintedRegion {
    rects: Vec<Box2D<f32, LayoutPixel>>,
}

A set of disjoint, axis-aligned rectangles that tracks exactly which area has already been painted for a Container Timing container, so that overlapping fragments (e.g. two overlapping <img>s) aren’t double-counted.

Mirrors the approach Chromium’s Container Timing implementation takes with cc::Region

Fields

rects: Vec<Box2D<f32, LayoutPixel>>

No two rects in this list overlap.

Implementations

impl PaintedRegion

pub(crate) fn area(&self) -> f32

The total painted area, i.e. the sum of the (disjoint) rects’ areas.

pub(crate) fn bounds(&self) -> Box2D<f32, LayoutPixel>

The smallest box containing every rect in this region.

pub(crate) fn contains(&self, rect: Box2D<f32, LayoutPixel>) -> bool

Returns true if rect is already entirely covered by this region, i.e. merging it in would add no new area.

pub(crate) fn union(&mut self, rect: Box2D<f32, LayoutPixel>)

Merges rect into the region, splitting it against existing rects so the region remains disjoint. (matches Chromium’s use of gfx::ToEnclosingRect before touching cc::Region).

pub(crate) fn merge(&mut self, other: &PaintedRegion)

Trait Implementations

impl Clone for PaintedRegion

fn clone(&self) -> PaintedRegion

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for PaintedRegion

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for PaintedRegion

fn default() -> PaintedRegion

Returns the “default value” for a type.