Struct ClipStack 

pub struct ClipStack { /* private fields */ }

A push-down stack of intersecting clip rectangles.

Each push intersects the new rect with the current top and stores the result. Callers are therefore always looking at the effective clip, never the raw per-layer rect.

Implementations

impl ClipStack

pub fn new() -> Self

Construct an empty ClipStack.

pub fn push(&mut self, rect: ClipRect)

Push a new clip rect, intersecting it with the current top.

If the stack is empty, rect is pushed directly. If the intersection with the current top is empty, nothing is pushed and the stack is unchanged (the new layer would clip everything away anyway; the caller should balance pushes with pops regardless).

pub fn pop(&mut self)

Pop the topmost clip rect. Does nothing (no panic) if the stack is empty.

pub fn current(&self) -> Option<&ClipRect>

Return the current (topmost, effective) clip rect, or None if the stack is empty.

pub fn as_scissor(&self) -> Option<[u32; 4]>

Return the current clip as integer [x, y, w, h] rounded outward (floor on origin, ceil on extent).

Returns None if the stack is empty. Negative components are clamped to zero before the conversion.

Trait Implementations

impl Debug for ClipStack

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

Formats the value using the given formatter.

impl Default for ClipStack

fn default() -> ClipStack

Returns the “default value” for a type.