orinium_browser/engine/bridge/text/
fallback.rs

1//! Fallback text measurer without font engine dependency.
2
3use super::{TextMeasureError, TextMeasureRequest, TextMeasurer};
4use crate::engine::{bridge::text::MeasuredFragment, layouter::types::TextStyle};
5
6/// Fallback text measurer.
7///
8/// This implementation does not rely on any font engine.
9/// It uses a simple heuristic based on font size and character count.
10/// Intended for testing, bring-up, and environments without font support.
11#[derive(Debug, Default)]
12pub struct FallbackTextMeasurer;
13
14impl TextMeasurer<TextStyle> for FallbackTextMeasurer {
15    fn measure(
16        &self,
17        request: &TextMeasureRequest<TextStyle>,
18    ) -> Result<Vec<MeasuredFragment>, TextMeasureError> {
19        let font_size = request.style.font_size.max(1.0);
20
21        // Heuristic constants
22        let char_width = font_size * 0.6;
23        let line_height = font_size * 1.2;
24
25        let fragments: Vec<MeasuredFragment> = request
26            .text
27            .split('\n')
28            .map(|line| {
29                let w = line.len() as f32 * char_width;
30                MeasuredFragment {
31                    text: line.to_string(),
32                    width: w,
33                    height: line_height,
34                }
35            })
36            .collect();
37
38        Ok(fragments)
39    }
40}
orinium_browser/engine/bridge/text/fallback.rs

orinium_browser/engine/bridge/text/
fallback.rs
