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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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23
components/fonts/platform/windows/font.rs
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@ -14,6 +14,7 @@ use std::sync::Arc;
use app_units::Au;
use dwrote::{FontFace, FontFile};
use euclid::default::{Point2D, Rect, Size2D};
use log::{debug, warn};
use style::computed_values::font_stretch::T as StyleFontStretch;
use style::computed_values::font_weight::T as StyleFontWeight;
@ -273,4 +274,26 @@ impl PlatformFontMethods for PlatformFont {
fn webrender_font_instance_flags(&self) -> FontInstanceFlags {
FontInstanceFlags::empty()
}
fn typographic_bounds(&self, glyph_id: GlyphId) -> Rect<f32> {
let metrics = self
.face
.get_design_glyph_metrics(&[glyph_id as u16], false);
let metrics = &metrics[0];
let advance_width = metrics.advanceWidth as f32;
let advance_height = metrics.advanceHeight as f32;
let left_side_bearing = metrics.leftSideBearing as f32;
let right_side_bearing = metrics.rightSideBearing as f32;
let top_side_bearing = metrics.topSideBearing as f32;
let bottom_side_bearing = metrics.bottomSideBearing as f32;
let vertical_origin_y = metrics.verticalOriginY as f32;
let y_offset = vertical_origin_y + bottom_side_bearing - advance_height;
let width = advance_width - (left_side_bearing + right_side_bearing);
let height = advance_height - (top_side_bearing + bottom_side_bearing);
Rect::new(
Point2D::new(left_side_bearing, y_offset),
Size2D::new(width, height),
)
}
}