mirror of
https://github.com/servo/servo.git
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668 lines
27 KiB
Rust
668 lines
27 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 crate::context::LayoutContext;
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use crate::fragments::{BoxFragment, Fragment};
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use crate::geom::physical::{Rect, Vec2};
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use crate::replaced::IntrinsicSizes;
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use embedder_traits::Cursor;
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use euclid::{Point2D, SideOffsets2D, Size2D, Vector2D};
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use gfx::text::glyph::GlyphStore;
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use mitochondria::OnceCell;
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use net_traits::image_cache::UsePlaceholder;
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use std::sync::Arc;
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use style::dom::OpaqueNode;
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use style::properties::ComputedValues;
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use style::values::computed::{BorderStyle, Length, LengthPercentage};
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use style::values::specified::ui::CursorKind;
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use webrender_api::{self as wr, units};
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#[derive(Clone, Copy)]
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pub struct WebRenderImageInfo {
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pub width: u32,
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pub height: u32,
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pub key: Option<wr::ImageKey>,
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}
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// `webrender_api::display_item::ItemTag` is private
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type ItemTag = (u64, u16);
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type HitInfo = Option<ItemTag>;
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pub struct DisplayListBuilder<'a> {
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current_space_and_clip: wr::SpaceAndClipInfo,
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pub context: &'a LayoutContext<'a>,
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pub wr: wr::DisplayListBuilder,
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/// Contentful paint, for the purpose of
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/// https://w3c.github.io/paint-timing/#first-contentful-paint
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/// (i.e. the display list contains items of type text,
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/// image, non-white canvas or SVG). Used by metrics.
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pub is_contentful: bool,
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}
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impl<'a> DisplayListBuilder<'a> {
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pub fn new(
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pipeline_id: wr::PipelineId,
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context: &'a LayoutContext,
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viewport_size: wr::units::LayoutSize,
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) -> Self {
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Self {
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current_space_and_clip: wr::SpaceAndClipInfo::root_scroll(pipeline_id),
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is_contentful: false,
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context,
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wr: wr::DisplayListBuilder::new(pipeline_id, viewport_size),
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}
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}
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fn common_properties(&self, clip_rect: units::LayoutRect) -> wr::CommonItemProperties {
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// TODO(gw): Make use of the WR backface visibility functionality.
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wr::CommonItemProperties::new(clip_rect, self.current_space_and_clip)
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}
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// FIXME: use this for the `overflow` property or anything else that clips an entire subtree.
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#[allow(unused)]
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fn clipping_and_scrolling_scope<R>(&mut self, f: impl FnOnce(&mut Self) -> R) -> R {
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let previous = self.current_space_and_clip;
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let result = f(self);
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self.current_space_and_clip = previous;
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result
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}
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}
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impl Fragment {
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pub(crate) fn build_display_list(
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&self,
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builder: &mut DisplayListBuilder,
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containing_block: &Rect<Length>,
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) {
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match self {
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Fragment::Box(b) => BuilderForBoxFragment::new(b, containing_block).build(builder),
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Fragment::Anonymous(a) => {
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let rect = a
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.rect
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.to_physical(a.mode, containing_block)
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.translate(&containing_block.top_left);
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for child in &a.children {
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child.build_display_list(builder, &rect)
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}
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},
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Fragment::Text(t) => {
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builder.is_contentful = true;
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let rect = t
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.rect
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.to_physical(t.parent_style.writing_mode, containing_block)
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.translate(&containing_block.top_left);
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let mut baseline_origin = rect.top_left.clone();
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baseline_origin.y += t.ascent;
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let glyphs = glyphs(&t.glyphs, baseline_origin);
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if glyphs.is_empty() {
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return;
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}
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let mut common = builder.common_properties(rect.clone().into());
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common.hit_info = hit_info(&t.parent_style, t.tag, Cursor::Text);
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let color = t.parent_style.clone_color();
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builder
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.wr
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.push_text(&common, rect.into(), &glyphs, t.font_key, rgba(color), None);
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},
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Fragment::Image(i) => {
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builder.is_contentful = true;
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let rect = i
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.rect
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.to_physical(i.style.writing_mode, containing_block)
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.translate(&containing_block.top_left);
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let common = builder.common_properties(rect.clone().into());
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builder.wr.push_image(
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&common,
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rect.into(),
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image_rendering(i.style.get_inherited_box().image_rendering),
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wr::AlphaType::PremultipliedAlpha,
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i.image_key,
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wr::ColorF::WHITE,
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);
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},
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}
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}
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}
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struct BuilderForBoxFragment<'a> {
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fragment: &'a BoxFragment,
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containing_block: &'a Rect<Length>,
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border_rect: units::LayoutRect,
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padding_rect: OnceCell<units::LayoutRect>,
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content_rect: OnceCell<units::LayoutRect>,
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border_radius: wr::BorderRadius,
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border_edge_clip_id: OnceCell<Option<wr::ClipId>>,
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}
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impl<'a> BuilderForBoxFragment<'a> {
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fn new(fragment: &'a BoxFragment, containing_block: &'a Rect<Length>) -> Self {
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let border_rect: units::LayoutRect = fragment
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.border_rect()
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.to_physical(fragment.style.writing_mode, containing_block)
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.translate(&containing_block.top_left)
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.into();
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let border_radius = {
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let resolve = |radius: &LengthPercentage, box_size: f32| {
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radius.percentage_relative_to(Length::new(box_size)).px()
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};
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let corner = |corner: &style::values::computed::BorderCornerRadius| {
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Size2D::new(
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resolve(&corner.0.width.0, border_rect.size.width),
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resolve(&corner.0.height.0, border_rect.size.height),
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)
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};
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let b = fragment.style.get_border();
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wr::BorderRadius {
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top_left: corner(&b.border_top_left_radius),
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top_right: corner(&b.border_top_right_radius),
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bottom_right: corner(&b.border_bottom_right_radius),
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bottom_left: corner(&b.border_bottom_left_radius),
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}
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};
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Self {
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fragment,
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containing_block,
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border_rect,
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border_radius,
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padding_rect: OnceCell::new(),
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content_rect: OnceCell::new(),
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border_edge_clip_id: OnceCell::new(),
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}
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}
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fn content_rect(&self) -> &units::LayoutRect {
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self.content_rect.init_once(|| {
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self.fragment
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.content_rect
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.to_physical(self.fragment.style.writing_mode, self.containing_block)
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.translate(&self.containing_block.top_left)
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.into()
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})
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}
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fn padding_rect(&self) -> &units::LayoutRect {
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self.padding_rect.init_once(|| {
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self.fragment
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.padding_rect()
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.to_physical(self.fragment.style.writing_mode, self.containing_block)
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.translate(&self.containing_block.top_left)
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.into()
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})
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}
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fn with_border_edge_clip(
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&mut self,
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builder: &mut DisplayListBuilder,
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common: &mut wr::CommonItemProperties,
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) {
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let initialized = self.border_edge_clip_id.init_once(|| {
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if self.border_radius.is_zero() {
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None
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} else {
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Some(builder.wr.define_clip(
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&builder.current_space_and_clip,
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self.border_rect,
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Some(wr::ComplexClipRegion {
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rect: self.border_rect,
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radii: self.border_radius,
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mode: wr::ClipMode::Clip,
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}),
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None,
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))
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}
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});
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if let Some(clip_id) = *initialized {
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common.clip_id = clip_id
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}
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}
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fn build(&mut self, builder: &mut DisplayListBuilder) {
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let hit_info = hit_info(&self.fragment.style, self.fragment.tag, Cursor::Default);
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if hit_info.is_some() {
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let mut common = builder.common_properties(self.border_rect);
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common.hit_info = hit_info;
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self.with_border_edge_clip(builder, &mut common);
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builder.wr.push_hit_test(&common)
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}
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self.build_background(builder);
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self.build_border(builder);
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let content_rect = self
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.fragment
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.content_rect
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.to_physical(self.fragment.style.writing_mode, self.containing_block)
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.translate(&self.containing_block.top_left);
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for child in &self.fragment.children {
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child.build_display_list(builder, &content_rect)
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}
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}
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fn build_background(&mut self, builder: &mut DisplayListBuilder) {
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use style::values::computed::image::{Image, ImageLayer};
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let b = self.fragment.style.get_background();
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let background_color = self.fragment.style.resolve_color(b.background_color);
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if background_color.alpha > 0 {
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let mut common = builder.common_properties(self.border_rect);
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self.with_border_edge_clip(builder, &mut common);
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builder.wr.push_rect(&common, rgba(background_color))
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}
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// Reverse because the property is top layer first, we want to paint bottom layer first.
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for (index, layer) in b.background_image.0.iter().enumerate().rev() {
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match layer {
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ImageLayer::None => {},
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ImageLayer::Image(image) => match image {
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Image::Gradient(_gradient) => {
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// TODO
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},
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Image::Url(image_url) => {
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if let Some(url) = image_url.url() {
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let webrender_image = builder.context.get_webrender_image_for_url(
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self.fragment.tag,
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url.clone(),
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UsePlaceholder::No,
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);
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if let Some(WebRenderImageInfo {
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width,
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height,
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key: Some(key),
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}) = webrender_image
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{
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// FIXME: https://drafts.csswg.org/css-images-4/#the-image-resolution
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let dppx = 1.0;
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let intrinsic = IntrinsicSizes {
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width: Some(Length::new(width as f32 / dppx)),
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height: Some(Length::new(height as f32 / dppx)),
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// FIXME https://github.com/w3c/csswg-drafts/issues/4572
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ratio: Some(width as f32 / height as f32),
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};
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self.build_background_raster_image(builder, index, intrinsic, key)
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}
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}
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},
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// Gecko-only value, represented as a (boxed) empty enum on non-Gecko.
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Image::Rect(rect) => match **rect {},
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},
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}
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}
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}
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fn build_background_raster_image(
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&mut self,
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builder: &mut DisplayListBuilder,
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index: usize,
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intrinsic: IntrinsicSizes,
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key: wr::ImageKey,
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) {
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use style::computed_values::background_clip::single_value::T as Clip;
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use style::computed_values::background_origin::single_value::T as Origin;
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use style::values::computed::background::BackgroundSize as Size;
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use style::values::specified::background::BackgroundRepeat as RepeatXY;
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use style::values::specified::background::BackgroundRepeatKeyword as Repeat;
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fn get_cyclic<T>(values: &[T], index: usize) -> &T {
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&values[index % values.len()]
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}
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let b = self.fragment.style.get_background();
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let clipping_area = match get_cyclic(&b.background_clip.0, index) {
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Clip::ContentBox => self.content_rect(),
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Clip::PaddingBox => self.padding_rect(),
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Clip::BorderBox => &self.border_rect,
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};
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let positioning_area = match get_cyclic(&b.background_origin.0, index) {
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Origin::ContentBox => self.content_rect(),
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Origin::PaddingBox => self.padding_rect(),
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Origin::BorderBox => &self.border_rect,
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};
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// https://drafts.csswg.org/css-backgrounds/#background-size
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enum ContainOrCover {
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Contain,
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Cover,
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}
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let size_contain_or_cover = |background_size| {
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let mut tile_size = positioning_area.size;
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if let Some(intrinsic_ratio) = intrinsic.ratio {
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let positioning_ratio = positioning_area.size.width / positioning_area.size.height;
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// Whether the tile width (as opposed to height)
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// is scaled to that of the positioning area
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let fit_width = match background_size {
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ContainOrCover::Contain => positioning_ratio <= intrinsic_ratio,
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ContainOrCover::Cover => positioning_ratio > intrinsic_ratio,
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};
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// The other dimension needs to be adjusted
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if fit_width {
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tile_size.height = tile_size.width / intrinsic_ratio
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} else {
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tile_size.width = tile_size.height * intrinsic_ratio
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}
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}
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tile_size
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};
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let mut tile_size = match get_cyclic(&b.background_size.0, index) {
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Size::Contain => size_contain_or_cover(ContainOrCover::Contain),
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Size::Cover => size_contain_or_cover(ContainOrCover::Cover),
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Size::ExplicitSize { width, height } => {
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let mut width = width.non_auto().map(|lp| {
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lp.0.percentage_relative_to(Length::new(positioning_area.size.width))
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});
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let mut height = height.non_auto().map(|lp| {
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lp.0.percentage_relative_to(Length::new(positioning_area.size.height))
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});
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if width.is_none() && height.is_none() {
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// Both computed values are 'auto':
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// use intrinsic sizes, treating missing width or height as 'auto'
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width = intrinsic.width;
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height = intrinsic.height;
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}
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match (width, height) {
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(Some(w), Some(h)) => units::LayoutSize::new(w.px(), h.px()),
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(Some(w), None) => {
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let h = if let Some(intrinsic_ratio) = intrinsic.ratio {
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w / intrinsic_ratio
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} else if let Some(intrinsic_height) = intrinsic.height {
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intrinsic_height
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} else {
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// Treated as 100%
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Length::new(positioning_area.size.height)
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};
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units::LayoutSize::new(w.px(), h.px())
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},
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(None, Some(h)) => {
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let w = if let Some(intrinsic_ratio) = intrinsic.ratio {
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h * intrinsic_ratio
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} else if let Some(intrinsic_width) = intrinsic.width {
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intrinsic_width
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} else {
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// Treated as 100%
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Length::new(positioning_area.size.width)
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};
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units::LayoutSize::new(w.px(), h.px())
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},
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// Both comptued values were 'auto', and neither intrinsic size is present
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(None, None) => size_contain_or_cover(ContainOrCover::Contain),
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}
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},
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};
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if tile_size.width == 0.0 || tile_size.height == 0.0 {
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return;
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}
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struct Layout1DResult {
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repeat: bool,
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bounds_origin: f32,
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bounds_size: f32,
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}
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/// Abstract over the horizontal or vertical dimension
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/// Coordinates (0, 0) for the purpose of this function are the positioning area’s origin.
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fn layout_1d(
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tile_size: &mut f32,
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tile_spacing: &mut f32,
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mut repeat: Repeat,
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position: &LengthPercentage,
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clipping_area_origin: f32,
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clipping_area_size: f32,
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positioning_area_size: f32,
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) -> Layout1DResult {
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// https://drafts.csswg.org/css-backgrounds/#background-repeat
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if let Repeat::Round = repeat {
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*tile_size = positioning_area_size / (positioning_area_size / *tile_size).round();
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}
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// https://drafts.csswg.org/css-backgrounds/#background-position
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let mut position = position
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.percentage_relative_to(Length::new(positioning_area_size - *tile_size))
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.px();
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// https://drafts.csswg.org/css-backgrounds/#background-repeat
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if let Repeat::Space = repeat {
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// The most entire tiles we can fit
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let tile_count = (positioning_area_size / *tile_size).floor();
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if tile_count >= 2.0 {
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position = 0.0;
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// Make the outsides of the first and last of that many tiles
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// touch the edges of the positioning area:
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let total_space = positioning_area_size - *tile_size * tile_count;
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let spaces_count = tile_count - 1.0;
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*tile_spacing = total_space / spaces_count;
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} else {
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repeat = Repeat::NoRepeat
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}
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}
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match repeat {
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Repeat::Repeat | Repeat::Round | Repeat::Space => {
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// WebRender’s `RepeatingImageDisplayItem` contains a `bounds` rectangle and:
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//
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// * The tiling is clipped to the intersection of `clip_rect` and `bounds`
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// * The origin (top-left corner) of `bounds` is the position
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// of the “first” (top-left-most) tile.
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//
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// In the general case that first tile is not the one that is positioned by
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// `background-position`.
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// We want it to be the top-left-most tile that intersects with `clip_rect`.
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// We find it by offsetting by a whole number of strides,
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// then compute `bounds` such that:
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//
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// * Its bottom-right is the bottom-right of `clip_rect`
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// * Its top-left is the top-left of first tile.
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let tile_stride = *tile_size + *tile_spacing;
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let offset = position - clipping_area_origin;
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let bounds_origin = position - tile_stride * (offset / tile_stride).ceil();
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let bounds_size = clipping_area_size - bounds_origin - clipping_area_origin;
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Layout1DResult {
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repeat: true,
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bounds_origin,
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bounds_size,
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}
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},
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Repeat::NoRepeat => {
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// `RepeatingImageDisplayItem` always repeats in both dimension.
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// When we want only one of the dimensions to repeat,
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// we use the `bounds` rectangle to clip the tiling to one tile
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// in that dimension.
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Layout1DResult {
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repeat: false,
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bounds_origin: position,
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bounds_size: *tile_size,
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}
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},
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}
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}
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let mut tile_spacing = units::LayoutSize::zero();
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let RepeatXY(repeat_x, repeat_y) = *get_cyclic(&b.background_repeat.0, index);
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let result_x = layout_1d(
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&mut tile_size.width,
|
||
&mut tile_spacing.width,
|
||
repeat_x,
|
||
get_cyclic(&b.background_position_x.0, index),
|
||
clipping_area.origin.x - positioning_area.origin.x,
|
||
clipping_area.size.width,
|
||
positioning_area.size.width,
|
||
);
|
||
let result_y = layout_1d(
|
||
&mut tile_size.height,
|
||
&mut tile_spacing.height,
|
||
repeat_y,
|
||
get_cyclic(&b.background_position_y.0, index),
|
||
clipping_area.origin.y - positioning_area.origin.y,
|
||
clipping_area.size.height,
|
||
positioning_area.size.height,
|
||
);
|
||
let bounds = units::LayoutRect::new(
|
||
positioning_area.origin + Vector2D::new(result_x.bounds_origin, result_y.bounds_origin),
|
||
Size2D::new(result_x.bounds_size, result_y.bounds_size),
|
||
);
|
||
|
||
// The 'backgound-clip' property maps directly to `clip_rect` in `CommonItemProperties`:
|
||
let mut common = builder.common_properties(*clipping_area);
|
||
self.with_border_edge_clip(builder, &mut common);
|
||
|
||
if result_x.repeat || result_y.repeat {
|
||
builder.wr.push_repeating_image(
|
||
&common,
|
||
bounds,
|
||
tile_size,
|
||
tile_spacing,
|
||
image_rendering(self.fragment.style.clone_image_rendering()),
|
||
wr::AlphaType::PremultipliedAlpha,
|
||
key,
|
||
wr::ColorF::WHITE,
|
||
)
|
||
} else {
|
||
builder.wr.push_image(
|
||
&common,
|
||
bounds,
|
||
image_rendering(self.fragment.style.clone_image_rendering()),
|
||
wr::AlphaType::PremultipliedAlpha,
|
||
key,
|
||
wr::ColorF::WHITE,
|
||
)
|
||
}
|
||
}
|
||
|
||
fn build_border(&mut self, builder: &mut DisplayListBuilder) {
|
||
let b = self.fragment.style.get_border();
|
||
let widths = SideOffsets2D::new(
|
||
b.border_top_width.px(),
|
||
b.border_right_width.px(),
|
||
b.border_bottom_width.px(),
|
||
b.border_left_width.px(),
|
||
);
|
||
if widths == SideOffsets2D::zero() {
|
||
return;
|
||
}
|
||
let side = |style, color| wr::BorderSide {
|
||
color: rgba(self.fragment.style.resolve_color(color)),
|
||
style: match style {
|
||
BorderStyle::None => wr::BorderStyle::None,
|
||
BorderStyle::Solid => wr::BorderStyle::Solid,
|
||
BorderStyle::Double => wr::BorderStyle::Double,
|
||
BorderStyle::Dotted => wr::BorderStyle::Dotted,
|
||
BorderStyle::Dashed => wr::BorderStyle::Dashed,
|
||
BorderStyle::Hidden => wr::BorderStyle::Hidden,
|
||
BorderStyle::Groove => wr::BorderStyle::Groove,
|
||
BorderStyle::Ridge => wr::BorderStyle::Ridge,
|
||
BorderStyle::Inset => wr::BorderStyle::Inset,
|
||
BorderStyle::Outset => wr::BorderStyle::Outset,
|
||
},
|
||
};
|
||
let common = builder.common_properties(self.border_rect);
|
||
let details = wr::BorderDetails::Normal(wr::NormalBorder {
|
||
top: side(b.border_top_style, b.border_top_color),
|
||
right: side(b.border_right_style, b.border_right_color),
|
||
bottom: side(b.border_bottom_style, b.border_bottom_color),
|
||
left: side(b.border_left_style, b.border_left_color),
|
||
radius: self.border_radius,
|
||
do_aa: true,
|
||
});
|
||
builder
|
||
.wr
|
||
.push_border(&common, self.border_rect, widths, details)
|
||
}
|
||
}
|
||
|
||
fn rgba(rgba: cssparser::RGBA) -> wr::ColorF {
|
||
wr::ColorF::new(
|
||
rgba.red_f32(),
|
||
rgba.green_f32(),
|
||
rgba.blue_f32(),
|
||
rgba.alpha_f32(),
|
||
)
|
||
}
|
||
|
||
fn glyphs(glyph_runs: &[Arc<GlyphStore>], mut origin: Vec2<Length>) -> Vec<wr::GlyphInstance> {
|
||
use gfx_traits::ByteIndex;
|
||
use range::Range;
|
||
|
||
let mut glyphs = vec![];
|
||
for run in glyph_runs {
|
||
for glyph in run.iter_glyphs_for_byte_range(&Range::new(ByteIndex(0), run.len())) {
|
||
if !run.is_whitespace() {
|
||
let glyph_offset = glyph.offset().unwrap_or(Point2D::zero());
|
||
let point = units::LayoutPoint::new(
|
||
origin.x.px() + glyph_offset.x.to_f32_px(),
|
||
origin.y.px() + glyph_offset.y.to_f32_px(),
|
||
);
|
||
let glyph = wr::GlyphInstance {
|
||
index: glyph.id(),
|
||
point,
|
||
};
|
||
glyphs.push(glyph);
|
||
}
|
||
origin.x += Length::from(glyph.advance());
|
||
}
|
||
}
|
||
glyphs
|
||
}
|
||
|
||
fn hit_info(style: &ComputedValues, tag: OpaqueNode, auto_cursor: Cursor) -> HitInfo {
|
||
use style::computed_values::pointer_events::T as PointerEvents;
|
||
|
||
let inherited_ui = style.get_inherited_ui();
|
||
if inherited_ui.pointer_events == PointerEvents::None {
|
||
None
|
||
} else {
|
||
let cursor = cursor(inherited_ui.cursor.keyword, auto_cursor);
|
||
Some((tag.0 as u64, cursor as u16))
|
||
}
|
||
}
|
||
|
||
fn cursor(kind: CursorKind, auto_cursor: Cursor) -> Cursor {
|
||
match kind {
|
||
CursorKind::Auto => auto_cursor,
|
||
CursorKind::None => Cursor::None,
|
||
CursorKind::Default => Cursor::Default,
|
||
CursorKind::Pointer => Cursor::Pointer,
|
||
CursorKind::ContextMenu => Cursor::ContextMenu,
|
||
CursorKind::Help => Cursor::Help,
|
||
CursorKind::Progress => Cursor::Progress,
|
||
CursorKind::Wait => Cursor::Wait,
|
||
CursorKind::Cell => Cursor::Cell,
|
||
CursorKind::Crosshair => Cursor::Crosshair,
|
||
CursorKind::Text => Cursor::Text,
|
||
CursorKind::VerticalText => Cursor::VerticalText,
|
||
CursorKind::Alias => Cursor::Alias,
|
||
CursorKind::Copy => Cursor::Copy,
|
||
CursorKind::Move => Cursor::Move,
|
||
CursorKind::NoDrop => Cursor::NoDrop,
|
||
CursorKind::NotAllowed => Cursor::NotAllowed,
|
||
CursorKind::Grab => Cursor::Grab,
|
||
CursorKind::Grabbing => Cursor::Grabbing,
|
||
CursorKind::EResize => Cursor::EResize,
|
||
CursorKind::NResize => Cursor::NResize,
|
||
CursorKind::NeResize => Cursor::NeResize,
|
||
CursorKind::NwResize => Cursor::NwResize,
|
||
CursorKind::SResize => Cursor::SResize,
|
||
CursorKind::SeResize => Cursor::SeResize,
|
||
CursorKind::SwResize => Cursor::SwResize,
|
||
CursorKind::WResize => Cursor::WResize,
|
||
CursorKind::EwResize => Cursor::EwResize,
|
||
CursorKind::NsResize => Cursor::NsResize,
|
||
CursorKind::NeswResize => Cursor::NeswResize,
|
||
CursorKind::NwseResize => Cursor::NwseResize,
|
||
CursorKind::ColResize => Cursor::ColResize,
|
||
CursorKind::RowResize => Cursor::RowResize,
|
||
CursorKind::AllScroll => Cursor::AllScroll,
|
||
CursorKind::ZoomIn => Cursor::ZoomIn,
|
||
CursorKind::ZoomOut => Cursor::ZoomOut,
|
||
}
|
||
}
|
||
|
||
fn image_rendering(ir: style::computed_values::image_rendering::T) -> wr::ImageRendering {
|
||
use style::computed_values::image_rendering::T as ImageRendering;
|
||
match ir {
|
||
ImageRendering::Auto => wr::ImageRendering::Auto,
|
||
ImageRendering::CrispEdges => wr::ImageRendering::CrispEdges,
|
||
ImageRendering::Pixelated => wr::ImageRendering::Pixelated,
|
||
}
|
||
}
|