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/* 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 crate::fragments::{BoxFragment, Fragment};
use crate::geom::physical::{Rect, Vec2};
use crate::style_ext::ComputedValuesExt;
use app_units::Au;
use euclid::{Point2D, SideOffsets2D};
use gfx::text::glyph::GlyphStore;
use servo_geometry::MaxRect;
use std::sync::Arc;
use style::values::computed::{BorderStyle, Length};
use webrender_api::{self as wr, units, CommonItemProperties, PrimitiveFlags};
pub struct DisplayListBuilder {
pipeline_id: wr::PipelineId,
pub wr: wr::DisplayListBuilder,
pub is_contentful: bool,
}
impl DisplayListBuilder {
pub fn new(pipeline_id: wr::PipelineId, viewport_size: wr::units::LayoutSize) -> Self {
Self {
pipeline_id,
is_contentful: false,
wr: wr::DisplayListBuilder::new(pipeline_id, viewport_size),
}
}
}
/// Contentful paint, for the purpose of
/// https://w3c.github.io/paint-timing/#first-contentful-paint
/// (i.e. the display list contains items of type text,
/// image, non-white canvas or SVG). Used by metrics.
pub struct IsContentful(pub bool);
impl Fragment {
pub(crate) fn build_display_list(
&self,
builder: &mut DisplayListBuilder,
is_contentful: &mut IsContentful,
containing_block: &Rect<Length>,
) {
match self {
Fragment::Box(b) => b.build_display_list(builder, is_contentful, containing_block),
Fragment::Anonymous(a) => {
let rect = a
.rect
.to_physical(a.mode, containing_block)
.translate(&containing_block.top_left);
for child in &a.children {
child.build_display_list(builder, is_contentful, &rect)
}
},
Fragment::Text(t) => {
is_contentful.0 = true;
let rect = t
.content_rect
.to_physical(t.parent_style.writing_mode(), containing_block)
.translate(&containing_block.top_left);
let mut baseline_origin = rect.top_left.clone();
baseline_origin.y += t.ascent;
let common = CommonItemProperties {
clip_rect: rect.clone().into(),
clip_id: wr::ClipId::root(builder.pipeline_id),
spatial_id: wr::SpatialId::root_scroll_node(builder.pipeline_id),
hit_info: None,
// TODO(gw): Make use of the WR backface visibility functionality.
flags: PrimitiveFlags::default(),
};
let glyphs = glyphs(&t.glyphs, baseline_origin);
if glyphs.is_empty() {
return;
}
let color = t.parent_style.clone_color();
builder
.wr
.push_text(&common, rect.into(), &glyphs, t.font_key, rgba(color), None);
},
}
}
}
impl BoxFragment {
fn build_display_list(
&self,
builder: &mut DisplayListBuilder,
is_contentful: &mut IsContentful,
containing_block: &Rect<Length>,
) {
let border_rect = self
.border_rect()
.to_physical(self.style.writing_mode(), containing_block)
.translate(&containing_block.top_left)
.into();
let common = CommonItemProperties {
clip_rect: border_rect,
clip_id: wr::ClipId::root(builder.pipeline_id),
spatial_id: wr::SpatialId::root_scroll_node(builder.pipeline_id),
hit_info: None,
// TODO(gw): Make use of the WR backface visibility functionality.
flags: PrimitiveFlags::default(),
};
self.background_display_items(builder, &common);
self.border_display_items(builder, &common, border_rect);
let content_rect = self
.content_rect
.to_physical(self.style.writing_mode(), containing_block)
.translate(&containing_block.top_left);
for child in &self.children {
child.build_display_list(builder, is_contentful, &content_rect)
}
}
fn background_display_items(
&self,
builder: &mut DisplayListBuilder,
common: &CommonItemProperties,
) {
let background_color = self
.style
.resolve_color(self.style.clone_background_color());
if background_color.alpha > 0 {
builder.wr.push_rect(common, rgba(background_color))
}
}
fn border_display_items(
&self,
builder: &mut DisplayListBuilder,
common: &CommonItemProperties,
border_rect: units::LayoutRect,
) {
let b = self.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.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 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: wr::BorderRadius::zero(),
do_aa: true,
});
builder.wr.push_border(common, 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
}
|
