Struct ShadowRRect 

pub struct ShadowRRect {
    pub bounds: Rect,
    pub radii: [f32; 4],
    pub umbra_inset: f32,
    pub distance_correction: f32,
    pub hole: Option<ShadowHole>,
}

One pass of a shadow as Skia’s ShadowCircularRRectOp draws it: a round rect whose penumbra rises from its outer edge, bounds, toward the umbra umbra_inset in. Corners are fans of triangles whose offsets the GPU interpolates, so a corner is a quarter circle where the umbra meets its radius and a skewed one where the blur is wider. Every length is in the space the shadow is collected in.

Fields

bounds: Rect

The penumbra’s outer edge.

radii: [f32; 4]

The outer corner radii: top-left, top-right, bottom-right, bottom-left.

umbra_inset: f32

How far in from bounds the ramp runs, at most half the smaller side.

distance_correction: f32

The ramp’s coordinate at the umbra: the umbra inset over the blur.

hole: Option<ShadowHole>

The part an opaque caster covers, which the shadow leaves undrawn.

Implementations

impl ShadowRRect

pub fn scaled(self, scale: f32) -> Self

The same shadow in a space whose units are scale of this one’s.

pub fn translated(self, dx: f32, dy: f32) -> Self

The same shadow moved by dx, dy.

pub fn hole_rect(&self) -> Option<Rect>

The rect the hole spans, when there is one.

pub fn coverage(&self, x: f32, y: f32) -> f32

How much of the shadow’s color the point x, y takes: the falloff at the offset Skia’s mesh interpolates there, zero outside the shadow and in its hole.

pub fn row_coverage(&self, columns: Range<i32>, y: f32, out: &mut [f32])

Self::coverage at the centres of the pixels columns of the row whose centres lie at y, into out: columns alike in what their x gives the coverage, as the umbra’s middle is, compute it once.

pub fn row_key(&self, y: f32) -> ShadowRowKey

What a row of pixels whose centres lie at y gives Self::coverage besides x: two rows with equal keys take equal coverage at every x, so a raster computes a row once for the rows alike that follow it.

Trait Implementations

impl Clone for ShadowRRect

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for ShadowRRect

impl Debug for ShadowRRect

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

Formats the value using the given formatter.

impl PartialEq for ShadowRRect

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for ShadowRRect