Struct ControlBoundsSink 

pub struct ControlBoundsSink {
    bounds: Option<BoundingBox<Fixed>>,
}

Sink that measures the box a drawing stays within.

A curve counts through its control points rather than the path they describe, so one bulging inside its hull measures larger than it draws. That is a control box, which is what HarfBuzz reports for a charstring and what costs no arithmetic to find. Solving each curve would tighten the box and is not worth what it costs to a caller asking where a glyph roughly sits.

Nothing drawn leaves bounding_box empty, which is the answer for a glyph with no ink rather than a box of no size at the origin. The pen that measures a drawn outline the same way is ControlBoundsSink.

Fields

bounds: Option<BoundingBox<Fixed>>

Implementations

impl ControlBoundsSink

pub fn new() -> Self

Creates a sink that has measured nothing.

pub fn bounding_box(&self) -> Option<BoundingBox<Fixed>>

Returns the bounding box collected by this sink.

fn update_bounds(&mut self, x: Fixed, y: Fixed)

Trait Implementations

impl Clone for ControlBoundsSink

fn clone(&self) -> ControlBoundsSink

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl CommandSink for ControlBoundsSink

fn move_to(&mut self, x: Fixed, y: Fixed)

fn line_to(&mut self, x: Fixed, y: Fixed)

fn curve_to( &mut self, cx0: Fixed, cy0: Fixed, cx1: Fixed, cy1: Fixed, x: Fixed, y: Fixed, )

fn close(&mut self)

fn hstem(&mut self, y: Fixed, dy: Fixed)

Horizontal stem hint at y with height dy.

fn vstem(&mut self, x: Fixed, dx: Fixed)

Vertical stem hint at x with width dx.

fn hint_mask(&mut self, mask: &[u8])

Bitmask defining the hints that should be made active for the commands that follow.

fn counter_mask(&mut self, mask: &[u8])

Bitmask defining the counter hints that should be made active for the commands that follow.

fn clear_hints(&mut self)

Clear accumulated stem hints and all data derived from them.

fn finish(&mut self)

Called when charstring evaluation is complete.

impl Debug for ControlBoundsSink

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

Formats the value using the given formatter.

impl Default for ControlBoundsSink

fn default() -> ControlBoundsSink

Returns the “default value” for a type.