Struct LineBoxMetrics 

pub struct LineBoxMetrics { /* private fields */ }

Accumulates metrics for a single line box during inline layout.

Implements the CSS 2.2 §10.8.1 “half-leading” model:

• Each inline item has a content area (ascent + descent from font metrics)
• CSS line-height distributes “half-leading” equally above and below
• The line box height is the maximum extent of all items after leading

Usage: create a new LineBoxMetrics, call add_item() for each inline item on the line, then call line_height() and baseline_offset().

Implementations

impl LineBoxMetrics

pub fn new() -> Self

pub fn add_item(&mut self, ascent: f32, descent: f32, line_height: f32)

Add an inline item’s metrics to this line box.

• ascent: font ascent (positive, distance from baseline to top of text)
• descent: font descent (positive, distance from baseline to bottom of text)
• line_height: the computed CSS line-height for this item

Half-leading = (line_height - (ascent + descent)) / 2, added above and below.

pub fn line_height(&self) -> f32

The total height of the line box.

pub fn baseline_offset(&self) -> f32

The offset from the top of the line box to the baseline.

Trait Implementations

impl Clone for LineBoxMetrics

fn clone(&self) -> LineBoxMetrics

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for LineBoxMetrics

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

Formats the value using the given formatter.