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7787cab521
Now that legacy layout has been removed, the name `layout_2020` doesn't make much sense any longer, also it's 2025 now for better or worse. The split between the "layout thread" and "layout" also doesn't make as much sense since layout doesn't run on it's own thread. There's a possibility that it will in the future, but that should be something that the user of the crate controls rather than layout iself. This is part of the larger layout interface cleanup and optimization that @Looriool and I are doing. Testing: Covered by existing tests as this is just code movement. Signed-off-by: Martin Robinson <mrobinson@igalia.com>
259 lines
10 KiB
Rust
259 lines
10 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
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use app_units::Au;
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use base::id::ScrollTreeNodeId;
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use style::values::computed::basic_shape::{BasicShape, ClipPath};
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use style::values::computed::length_percentage::NonNegativeLengthPercentage;
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use style::values::computed::position::Position;
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use style::values::generics::basic_shape::{GenericShapeRadius, ShapeBox, ShapeGeometryBox};
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use style::values::generics::position::GenericPositionOrAuto;
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use webrender_api::ClipChainId;
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use webrender_api::units::{LayoutRect, LayoutSideOffsets, LayoutSize};
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use super::{BuilderForBoxFragment, DisplayList, compute_margin_box_radius, normalize_radii};
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pub(super) fn build_clip_path_clip_chain_if_necessary(
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clip_path: ClipPath,
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display_list: &mut DisplayList,
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parent_scroll_node_id: &ScrollTreeNodeId,
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parent_clip_chain_id: &ClipChainId,
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fragment_builder: BuilderForBoxFragment,
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) -> Option<ClipChainId> {
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let geometry_box = match clip_path {
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ClipPath::Shape(_, ShapeGeometryBox::ShapeBox(shape_box)) => shape_box,
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ClipPath::Shape(_, ShapeGeometryBox::ElementDependent) => ShapeBox::BorderBox,
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ClipPath::Box(ShapeGeometryBox::ShapeBox(shape_box)) => shape_box,
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ClipPath::Box(ShapeGeometryBox::ElementDependent) => ShapeBox::BorderBox,
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_ => return None,
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};
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let layout_rect = match geometry_box {
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ShapeBox::BorderBox => fragment_builder.border_rect,
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ShapeBox::ContentBox => *fragment_builder.content_rect(),
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ShapeBox::PaddingBox => *fragment_builder.padding_rect(),
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ShapeBox::MarginBox => *fragment_builder.margin_rect(),
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};
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if let ClipPath::Shape(shape, _) = clip_path {
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match *shape {
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BasicShape::Circle(_) | BasicShape::Ellipse(_) | BasicShape::Rect(_) => {
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build_simple_shape(
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*shape,
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layout_rect,
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parent_scroll_node_id,
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parent_clip_chain_id,
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display_list,
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)
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},
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BasicShape::Polygon(_) | BasicShape::PathOrShape(_) => None,
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}
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} else {
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Some(create_rect_clip_chain(
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match geometry_box {
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ShapeBox::MarginBox => compute_margin_box_radius(
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fragment_builder.border_radius,
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layout_rect.size(),
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fragment_builder.fragment,
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),
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_ => fragment_builder.border_radius,
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},
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layout_rect,
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parent_scroll_node_id,
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parent_clip_chain_id,
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display_list,
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))
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}
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}
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#[cfg_attr(
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feature = "tracing",
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tracing::instrument(
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name = "display_list::build_simple_shape",
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skip_all,
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fields(servo_profiling = true),
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level = "trace",
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)
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)]
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fn build_simple_shape(
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shape: BasicShape,
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layout_box: LayoutRect,
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parent_scroll_node_id: &ScrollTreeNodeId,
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parent_clip_chain_id: &ClipChainId,
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display_list: &mut DisplayList,
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) -> Option<ClipChainId> {
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match shape {
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BasicShape::Rect(rect) => {
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let box_height = Au::from_f32_px(layout_box.height());
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let box_width = Au::from_f32_px(layout_box.width());
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let insets = LayoutSideOffsets::new(
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rect.rect.0.to_used_value(box_height).to_f32_px(),
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rect.rect.1.to_used_value(box_width).to_f32_px(),
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rect.rect.2.to_used_value(box_height).to_f32_px(),
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rect.rect.3.to_used_value(box_width).to_f32_px(),
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);
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// `inner_rect()` will cause an assertion failure if the insets are larger than the
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// rectangle dimension.
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let shape_rect = if insets.left + insets.right >= layout_box.width() ||
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insets.top + insets.bottom > layout_box.height()
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{
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LayoutRect::from_origin_and_size(layout_box.min, LayoutSize::zero())
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} else {
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layout_box.to_rect().inner_rect(insets).to_box2d()
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};
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let corner = |corner: &style::values::computed::BorderCornerRadius| {
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LayoutSize::new(
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corner.0.width.0.to_used_value(box_width).to_f32_px(),
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corner.0.height.0.to_used_value(box_height).to_f32_px(),
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)
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};
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let mut radii = webrender_api::BorderRadius {
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top_left: corner(&rect.round.top_left),
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top_right: corner(&rect.round.top_right),
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bottom_left: corner(&rect.round.bottom_left),
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bottom_right: corner(&rect.round.bottom_right),
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};
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normalize_radii(&layout_box, &mut radii);
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Some(create_rect_clip_chain(
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radii,
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shape_rect,
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parent_scroll_node_id,
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parent_clip_chain_id,
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display_list,
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))
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},
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BasicShape::Circle(circle) => {
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let center = match circle.position {
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GenericPositionOrAuto::Position(position) => position,
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GenericPositionOrAuto::Auto => Position::center(),
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};
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let anchor_x = center
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.horizontal
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.to_used_value(Au::from_f32_px(layout_box.width()));
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let anchor_y = center
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.vertical
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.to_used_value(Au::from_f32_px(layout_box.height()));
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let center = layout_box
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.min
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.add_size(&LayoutSize::new(anchor_x.to_f32_px(), anchor_y.to_f32_px()));
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let horizontal =
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compute_shape_radius(center.x, &circle.radius, layout_box.min.x, layout_box.max.x);
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let vertical =
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compute_shape_radius(center.y, &circle.radius, layout_box.min.y, layout_box.max.y);
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// If the value is `Length` then both values should be the same at this point.
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let radius = match circle.radius {
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GenericShapeRadius::FarthestSide => horizontal.max(vertical),
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GenericShapeRadius::ClosestSide => horizontal.min(vertical),
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GenericShapeRadius::Length(_) => horizontal,
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};
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let radius = LayoutSize::new(radius, radius);
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let mut radii = webrender_api::BorderRadius {
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top_left: radius,
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top_right: radius,
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bottom_left: radius,
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bottom_right: radius,
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};
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let start = center.add_size(&-radius);
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let rect = LayoutRect::from_origin_and_size(start, radius * 2.);
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normalize_radii(&layout_box, &mut radii);
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Some(create_rect_clip_chain(
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radii,
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rect,
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parent_scroll_node_id,
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parent_clip_chain_id,
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display_list,
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))
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},
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BasicShape::Ellipse(ellipse) => {
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let center = match ellipse.position {
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GenericPositionOrAuto::Position(position) => position,
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GenericPositionOrAuto::Auto => Position::center(),
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};
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let anchor_x = center
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.horizontal
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.to_used_value(Au::from_f32_px(layout_box.width()));
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let anchor_y = center
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.vertical
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.to_used_value(Au::from_f32_px(layout_box.height()));
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let center = layout_box
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.min
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.add_size(&LayoutSize::new(anchor_x.to_f32_px(), anchor_y.to_f32_px()));
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let width = compute_shape_radius(
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center.x,
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&ellipse.semiaxis_x,
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layout_box.min.x,
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layout_box.max.x,
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);
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let height = compute_shape_radius(
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center.y,
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&ellipse.semiaxis_y,
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layout_box.min.y,
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layout_box.max.y,
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);
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let mut radii = webrender_api::BorderRadius {
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top_left: LayoutSize::new(width, height),
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top_right: LayoutSize::new(width, height),
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bottom_left: LayoutSize::new(width, height),
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bottom_right: LayoutSize::new(width, height),
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};
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let size = LayoutSize::new(width, height);
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let start = center.add_size(&-size);
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let rect = LayoutRect::from_origin_and_size(start, size * 2.);
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normalize_radii(&rect, &mut radii);
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Some(create_rect_clip_chain(
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radii,
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rect,
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parent_scroll_node_id,
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parent_clip_chain_id,
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display_list,
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))
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},
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_ => None,
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}
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}
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fn compute_shape_radius(
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center: f32,
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radius: &GenericShapeRadius<NonNegativeLengthPercentage>,
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min_edge: f32,
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max_edge: f32,
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) -> f32 {
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let distance_from_min_edge = (min_edge - center).abs();
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let distance_from_max_edge = (max_edge - center).abs();
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match radius {
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GenericShapeRadius::FarthestSide => distance_from_min_edge.max(distance_from_max_edge),
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GenericShapeRadius::ClosestSide => distance_from_min_edge.min(distance_from_max_edge),
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GenericShapeRadius::Length(length) => length
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.0
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.to_used_value(Au::from_f32_px(max_edge - min_edge))
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.to_f32_px(),
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}
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}
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fn create_rect_clip_chain(
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radii: webrender_api::BorderRadius,
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rect: LayoutRect,
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parent_scroll_node_id: &ScrollTreeNodeId,
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parent_clip_chain_id: &ClipChainId,
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display_list: &mut DisplayList,
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) -> ClipChainId {
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let new_clip_id = if radii.is_zero() {
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display_list
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.wr
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.define_clip_rect(parent_scroll_node_id.spatial_id, rect)
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} else {
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display_list.wr.define_clip_rounded_rect(
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parent_scroll_node_id.spatial_id,
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webrender_api::ComplexClipRegion {
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rect,
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radii,
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mode: webrender_api::ClipMode::Clip,
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},
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)
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};
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display_list.define_clip_chain(*parent_clip_chain_id, [new_clip_id])
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}
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