Struct CachedPaint 

pub struct CachedPaint { /* private fields */ }

A face painted at logical coordinates and appended, translated, on later frames while the widget keeps its size: a widget that only moves (a scrolled row, a reflowed toolbar) costs no shaping or encoding.

Implementations

impl CachedPaint

pub fn is_empty(&self) -> bool

Whether nothing is painted yet.

pub fn resized(&self, rect: Rect) -> bool

Whether rect has another size than the face was painted at. Exact on purpose: this detects a change for the cache, it does not compare numbers that need a tolerance.

pub fn append(&self, out: &mut Scene, transform: Affine, rect: Rect)

Append the face to out for a widget now at rect, translated from where it was painted.

pub fn scene_mut(&mut self) -> &mut Scene

The scene last Self::repainted, to paint more of the face into, in the same coordinates.

pub fn repaint(&mut self, rect: Rect) -> &mut Scene

The emptied scene to paint the face into, in the coordinates of rect, which later Self::appends translate from.

Trait Implementations

impl Default for CachedPaint

fn default() -> CachedPaint

Returns the “default value” for a type.