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Paint only glyphs that intersect the visible bounds in Text

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Co-Authored-By: Nathan Sobo <nathan@zed.dev>
This commit is contained in:
Antonio Scandurra 2021-09-02 14:14:05 +02:00
parent 0490c609fb
commit bdc35f03f2
2 changed files with 31 additions and 12 deletions
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21
gpui/src/elements/text.rs
View file

@ -82,13 +82,24 @@ impl Element for Text {
) -> Self::PaintState {
let mut origin = bounds.origin();
for (line, wrap_boundaries) in &layout.lines {
line.paint_wrapped(
let wrapped_line_boundaries = RectF::new(
origin,
layout.line_height,
wrap_boundaries.iter().copied(),
cx,
vec2f(
bounds.width(),
(wrap_boundaries.len() + 1) as f32 * layout.line_height,
),
);
origin.set_y(origin.y() + (wrap_boundaries.len() + 1) as f32 * layout.line_height);
if wrapped_line_boundaries.intersects(visible_bounds) {
line.paint_wrapped(
origin,
visible_bounds,
layout.line_height,
wrap_boundaries.iter().copied(),
cx,
);
}
origin.set_y(wrapped_line_boundaries.max_y());
}
}

22
gpui/src/text_layout.rs
View file

@ -253,6 +253,7 @@ impl Line {
pub fn paint_wrapped(
&self,
origin: Vector2F,
visible_bounds: RectF,
line_height: f32,
boundaries: impl IntoIterator<Item = ShapedBoundary>,
cx: &mut PaintContext,
@ -287,13 +288,20 @@ impl Line {
}
}
cx.scene.push_glyph(scene::Glyph {
font_id: run.font_id,
font_size: self.layout.font_size,
id: glyph.id,
origin: origin + glyph_origin,
color,
});
let glyph_bounds = RectF::new(
origin + glyph_origin,
cx.font_cache
.bounding_box(run.font_id, self.layout.font_size),
);
if glyph_bounds.intersects(visible_bounds) {
cx.scene.push_glyph(scene::Glyph {
font_id: run.font_id,
font_size: self.layout.font_size,
id: glyph.id,
origin: origin + glyph_origin,
color,
});
}
}
}
}