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Remove legacy layout (layout 2013) (#35943)

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We were already not compiling it and not running tests on it by default.
So it's simpler to just completely remove it.

Signed-off-by: Oriol Brufau <obrufau@igalia.com>
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Oriol Brufau 2025-03-13 08:26:57 +01:00 • committed by GitHub
parent f93006af95
commit 7594dc6991
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349
components/layout/display_list/gradient.rs
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@ -1,349 +0,0 @@
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
use app_units::Au;
use euclid::default::{Point2D, Size2D, Vector2D};
use style::color::mix::ColorInterpolationMethod;
use style::properties::ComputedValues;
use style::values::computed::image::{EndingShape, LineDirection};
use style::values::computed::{Angle, Color, LengthPercentage, Percentage, Position};
use style::values::generics::image::{
Circle, ColorStop, Ellipse, GradientFlags, GradientItem, ShapeExtent,
};
use webrender_api::{ExtendMode, Gradient, GradientBuilder, GradientStop, RadialGradient};
use crate::display_list::ToLayout;
/// A helper data structure for gradients.
#[derive(Clone, Copy)]
struct StopRun {
start_offset: f32,
end_offset: f32,
start_index: usize,
stop_count: usize,
}
/// Determines the radius of a circle if it was not explicitly provided.
/// <https://drafts.csswg.org/css-images-3/#typedef-size>
fn circle_size_keyword(
keyword: ShapeExtent,
size: &Size2D<Au>,
center: &Point2D<Au>,
) -> Size2D<Au> {
let radius = match keyword {
ShapeExtent::ClosestSide | ShapeExtent::Contain => {
let dist = distance_to_sides(size, center, ::std::cmp::min);
::std::cmp::min(dist.width, dist.height)
},
ShapeExtent::FarthestSide => {
let dist = distance_to_sides(size, center, ::std::cmp::max);
::std::cmp::max(dist.width, dist.height)
},
ShapeExtent::ClosestCorner => distance_to_corner(size, center, ::std::cmp::min),
ShapeExtent::FarthestCorner | ShapeExtent::Cover => {
distance_to_corner(size, center, ::std::cmp::max)
},
};
Size2D::new(radius, radius)
}
/// Returns the radius for an ellipse with the same ratio as if it was matched to the sides.
fn ellipse_radius<F>(size: &Size2D<Au>, center: &Point2D<Au>, cmp: F) -> Size2D<Au>
where
F: Fn(Au, Au) -> Au,
{
let dist = distance_to_sides(size, center, cmp);
Size2D::new(
dist.width.scale_by(::std::f32::consts::FRAC_1_SQRT_2 * 2.0),
dist.height
.scale_by(::std::f32::consts::FRAC_1_SQRT_2 * 2.0),
)
}
/// Determines the radius of an ellipse if it was not explicitly provided.
/// <https://drafts.csswg.org/css-images-3/#typedef-size>
fn ellipse_size_keyword(
keyword: ShapeExtent,
size: &Size2D<Au>,
center: &Point2D<Au>,
) -> Size2D<Au> {
match keyword {
ShapeExtent::ClosestSide | ShapeExtent::Contain => {
distance_to_sides(size, center, ::std::cmp::min)
},
ShapeExtent::FarthestSide => distance_to_sides(size, center, ::std::cmp::max),
ShapeExtent::ClosestCorner => ellipse_radius(size, center, ::std::cmp::min),
ShapeExtent::FarthestCorner | ShapeExtent::Cover => {
ellipse_radius(size, center, ::std::cmp::max)
},
}
}
fn convert_gradient_stops(
style: &ComputedValues,
gradient_items: &[GradientItem<Color, LengthPercentage>],
total_length: Au,
) -> GradientBuilder {
// Determine the position of each stop per CSS-IMAGES § 3.4.
// Only keep the color stops, discard the color interpolation hints.
let mut stop_items = gradient_items
.iter()
.filter_map(|item| match item {
GradientItem::SimpleColorStop(color) => Some(ColorStop {
color,
position: None,
}),
GradientItem::ComplexColorStop {
color,
ref position,
} => Some(ColorStop {
color,
position: Some(position.clone()),
}),
_ => None,
})
.collect::<Vec<_>>();
assert!(!stop_items.is_empty());
// Run the algorithm from
// https://drafts.csswg.org/css-images-3/#color-stop-syntax
// Step 1:
// If the first color stop does not have a position, set its position to 0%.
{
let first = stop_items.first_mut().unwrap();
if first.position.is_none() {
first.position = Some(LengthPercentage::new_percent(Percentage(0.)));
}
}
// If the last color stop does not have a position, set its position to 100%.
{
let last = stop_items.last_mut().unwrap();
if last.position.is_none() {
last.position = Some(LengthPercentage::new_percent(Percentage(1.0)));
}
}
// Step 2: Move any stops placed before earlier stops to the
// same position as the preceding stop.
//
// FIXME(emilio): Once we know the offsets, it seems like converting the
// positions to absolute at once then process that would be cheaper.
let mut last_stop_position = stop_items
.first()
.unwrap()
.position
.as_ref()
.unwrap()
.clone();
for stop in stop_items.iter_mut().skip(1) {
if let Some(ref pos) = stop.position {
if position_to_offset(&last_stop_position, total_length) >
position_to_offset(pos, total_length)
{
stop.position = Some(last_stop_position);
}
last_stop_position = stop.position.as_ref().unwrap().clone();
}
}
// Step 3: Evenly space stops without position.
let mut stops = GradientBuilder::new();
let mut stop_run = None;
for (i, stop) in stop_items.iter().enumerate() {
let offset = match stop.position {
None => {
if stop_run.is_none() {
// Initialize a new stop run.
// `unwrap()` here should never fail because this is the beginning of
// a stop run, which is always bounded by a length or percentage.
let start_offset = position_to_offset(
stop_items[i - 1].position.as_ref().unwrap(),
total_length,
);
// `unwrap()` here should never fail because this is the end of
// a stop run, which is always bounded by a length or percentage.
let (end_index, end_stop) = stop_items[(i + 1)..]
.iter()
.enumerate()
.find(|(_, stop)| stop.position.is_some())
.unwrap();
let end_offset =
position_to_offset(end_stop.position.as_ref().unwrap(), total_length);
stop_run = Some(StopRun {
start_offset,
end_offset,
start_index: i - 1,
stop_count: end_index,
})
}
let stop_run = stop_run.unwrap();
let stop_run_length = stop_run.end_offset - stop_run.start_offset;
stop_run.start_offset +
stop_run_length * (i - stop_run.start_index) as f32 /
((2 + stop_run.stop_count) as f32)
},
Some(ref position) => {
stop_run = None;
position_to_offset(position, total_length)
},
};
assert!(offset.is_finite());
stops.push(GradientStop {
offset,
color: style.resolve_color(stop.color).to_layout(),
})
}
if stop_items.len() == 1 {
stops.push(stops.stops()[0])
}
stops
}
fn extend_mode(repeating: bool) -> ExtendMode {
if repeating {
ExtendMode::Repeat
} else {
ExtendMode::Clamp
}
}
/// Returns the the distance to the nearest or farthest corner depending on the comperator.
fn distance_to_corner<F>(size: &Size2D<Au>, center: &Point2D<Au>, cmp: F) -> Au
where
F: Fn(Au, Au) -> Au,
{
let dist = distance_to_sides(size, center, cmp);
Au::from_f32_px(dist.width.to_f32_px().hypot(dist.height.to_f32_px()))
}
/// Returns the distance to the nearest or farthest sides depending on the comparator.
///
/// The first return value is horizontal distance the second vertical distance.
fn distance_to_sides<F>(size: &Size2D<Au>, center: &Point2D<Au>, cmp: F) -> Size2D<Au>
where
F: Fn(Au, Au) -> Au,
{
let top_side = center.y;
let right_side = size.width - center.x;
let bottom_side = size.height - center.y;
let left_side = center.x;
Size2D::new(cmp(left_side, right_side), cmp(top_side, bottom_side))
}
fn position_to_offset(position: &LengthPercentage, total_length: Au) -> f32 {
if total_length == Au(0) {
return 0.0;
}
position.to_used_value(total_length).0 as f32 / total_length.0 as f32
}
pub fn linear(
style: &ComputedValues,
size: Size2D<Au>,
stops: &[GradientItem<Color, LengthPercentage>],
direction: LineDirection,
_color_interpolation_method: &ColorInterpolationMethod,
flags: GradientFlags,
) -> (Gradient, Vec<GradientStop>) {
use style::values::specified::position::HorizontalPositionKeyword::*;
use style::values::specified::position::VerticalPositionKeyword::*;
let repeating = flags.contains(GradientFlags::REPEATING);
let angle = match direction {
LineDirection::Angle(angle) => angle.radians(),
LineDirection::Horizontal(x) => match x {
Left => Angle::from_degrees(270.).radians(),
Right => Angle::from_degrees(90.).radians(),
},
LineDirection::Vertical(y) => match y {
Top => Angle::from_degrees(0.).radians(),
Bottom => Angle::from_degrees(180.).radians(),
},
LineDirection::Corner(horizontal, vertical) => {
// This the angle for one of the diagonals of the box. Our angle
// will either be this one, this one + PI, or one of the other
// two perpendicular angles.
let atan = (size.height.to_f32_px() / size.width.to_f32_px()).atan();
match (horizontal, vertical) {
(Right, Bottom) => ::std::f32::consts::PI - atan,
(Left, Bottom) => ::std::f32::consts::PI + atan,
(Right, Top) => atan,
(Left, Top) => -atan,
}
},
};
// Get correct gradient line length, based on:
// https://drafts.csswg.org/css-images-3/#linear-gradients
let dir = Point2D::new(angle.sin(), -angle.cos());
let line_length =
(dir.x * size.width.to_f32_px()).abs() + (dir.y * size.height.to_f32_px()).abs();
let inv_dir_length = 1.0 / (dir.x * dir.x + dir.y * dir.y).sqrt();
// This is the vector between the center and the ending point; i.e. half
// of the distance between the starting point and the ending point.
let delta = Vector2D::new(
Au::from_f32_px(dir.x * inv_dir_length * line_length / 2.0),
Au::from_f32_px(dir.y * inv_dir_length * line_length / 2.0),
);
// This is the length of the gradient line.
let length = Au::from_f32_px((delta.x.to_f32_px() * 2.0).hypot(delta.y.to_f32_px() * 2.0));
let mut builder = convert_gradient_stops(style, stops, length);
let center = Point2D::new(size.width / 2, size.height / 2);
(
builder.gradient(
(center - delta).to_layout(),
(center + delta).to_layout(),
extend_mode(repeating),
),
builder.into_stops(),
)
}
pub fn radial(
style: &ComputedValues,
size: Size2D<Au>,
stops: &[GradientItem<Color, LengthPercentage>],
shape: &EndingShape,
center: &Position,
_color_interpolation_method: &ColorInterpolationMethod,
flags: GradientFlags,
) -> (RadialGradient, Vec<GradientStop>) {
let repeating = flags.contains(GradientFlags::REPEATING);
let center = Point2D::new(
center.horizontal.to_used_value(size.width),
center.vertical.to_used_value(size.height),
);
let radius = match shape {
EndingShape::Circle(Circle::Radius(length)) => {
let length = Au::from(*length);
Size2D::new(length, length)
},
EndingShape::Circle(Circle::Extent(extent)) => circle_size_keyword(*extent, &size, &center),
EndingShape::Ellipse(Ellipse::Radii(x, y)) => {
Size2D::new(x.to_used_value(size.width), y.to_used_value(size.height))
},
EndingShape::Ellipse(Ellipse::Extent(extent)) => {
ellipse_size_keyword(*extent, &size, &center)
},
};
let mut builder = convert_gradient_stops(style, stops, radius.width);
(
builder.radial_gradient(
center.to_layout(),
radius.to_layout(),
extend_mode(repeating),
),
builder.into_stops(),
)
}