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canvas: Implement strokeText (#39183)

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Mostly it's just reusing/copy&edit fillText stuff.

Testing: Existing WPT tests
Fixes: #29973

Try run: https://github.com/sagudev/servo/actions/runs/17511337550

---------

Signed-off-by: sagudev <16504129+sagudev@users.noreply.github.com>
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Sam 2025-09-06 20:01:21 +02:00 • committed by GitHub
parent bd3231847e
commit 643ac08cf0
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28 changed files with 300 additions and 64 deletions
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44
components/canvas/vello_cpu_backend.rs
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@ -384,6 +384,50 @@ impl GenericDrawTarget for VelloCPUDrawTarget {
})
}
fn stroke_text(
&mut self,
text_runs: Vec<TextRun>,
style: FillOrStrokeStyle,
line_options: LineOptions,
composition_options: CompositionOptions,
transform: Transform2D<f64>,
) {
self.ensure_drawing();
self.ctx.set_paint(paint(style, composition_options.alpha));
self.ctx.set_stroke(line_options.convert());
self.ctx.set_transform(transform.cast().into());
self.with_composition(composition_options.composition_operation, |self_| {
for text_run in text_runs.iter() {
SHARED_FONT_CACHE.with(|font_cache| {
let identifier = &text_run.font.identifier;
if !font_cache.borrow().contains_key(identifier) {
let Some(font_data_and_index) = text_run.font.font_data_and_index() else {
return;
};
let font = font_data_and_index.convert();
font_cache.borrow_mut().insert(identifier.clone(), font);
}
let font_cache = font_cache.borrow();
let Some(font) = font_cache.get(identifier) else {
return;
};
self_
.ctx
.glyph_run(font)
.font_size(text_run.pt_size)
.stroke_glyphs(text_run.glyphs_and_positions.iter().map(
|glyph_and_position| vello_cpu::Glyph {
id: glyph_and_position.id,
x: glyph_and_position.point.x,
y: glyph_and_position.point.y,
},
));
});
}
})
}
fn stroke_rect(
&mut self,
rect: &Rect<f32>,