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enhance: Implement CanvasRenderingContext2D.measureText (#32704)

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Signed-off-by: Chocolate Pie <106949016+chocolate-pie@users.noreply.github.com>
Co-authored-by: Martin Robinson <mrobinson@igalia.com>
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Chocolate Pie 2024-07-18 04:20:18 +09:00 • committed by GitHub
parent d82232d549
commit 1223335547
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14 changed files with 325 additions and 51 deletions
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33
components/script/canvas_state.rs
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@ -10,7 +10,7 @@ use std::sync::Arc;
use canvas_traits::canvas::{
Canvas2dMsg, CanvasId, CanvasMsg, CompositionOrBlending, Direction, FillOrStrokeStyle,
FillRule, LineCapStyle, LineJoinStyle, LinearGradientStyle, RadialGradientStyle,
RepetitionStyle, TextAlign, TextBaseline,
RepetitionStyle, TextAlign, TextBaseline, TextMetrics as CanvasTextMetrics,
};
use cssparser::color::clamp_unit_f32;
use cssparser::{Parser, ParserInput};
@ -1030,11 +1030,34 @@ impl CanvasState {
}
// https://html.spec.whatwg.org/multipage/#textmetrics
pub fn measure_text(&self, global: &GlobalScope, _text: DOMString) -> DomRoot<TextMetrics> {
// FIXME: for now faking the implementation of MeasureText().
// See https://github.com/servo/servo/issues/5411#issuecomment-533776291
pub fn measure_text(
&self,
global: &GlobalScope,
canvas: Option<&HTMLCanvasElement>,
text: DOMString,
) -> DomRoot<TextMetrics> {
if self.state.borrow().font_style.is_none() {
self.set_font(canvas, CanvasContextState::DEFAULT_FONT_STYLE.into());
}
let (sender, receiver) = ipc::channel::<CanvasTextMetrics>().unwrap();
self.send_canvas_2d_msg(Canvas2dMsg::MeasureText(text.into(), sender));
let metrics = receiver.recv().unwrap();
TextMetrics::new(
global, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0,
global,
metrics.width.into(),
metrics.actual_boundingbox_left.into(),
metrics.actual_boundingbox_right.into(),
metrics.font_boundingbox_ascent.into(),
metrics.font_boundingbox_descent.into(),
metrics.actual_boundingbox_ascent.into(),
metrics.actual_boundingbox_descent.into(),
metrics.em_height_ascent.into(),
metrics.em_height_descent.into(),
metrics.hanging_baseline.into(),
metrics.alphabetic_baseline.into(),
metrics.ideographic_baseline.into(),
)
}