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fragments.rs
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fragments.rs
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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::geom::flow_relative::{Rect, Sides};
use crate::style_ext::{Direction, WritingMode};
use gfx::text::glyph::GlyphStore;
use servo_arc::Arc as ServoArc;
use std::sync::Arc;
use style::properties::ComputedValues;
use style::values::computed::Length;
use style::Zero;
use webrender_api::{FontInstanceKey, ImageKey};
pub(crate) enum Fragment {
Box(BoxFragment),
Anonymous(AnonymousFragment),
Text(TextFragment),
Image(ImageFragment),
}
pub(crate) struct BoxFragment {
pub style: ServoArc<ComputedValues>,
pub children: Vec<Fragment>,
/// From the containing block’s start corner…?
/// This might be broken when the containing block is in a different writing mode:
/// https://drafts.csswg.org/css-writing-modes/#orthogonal-flows
pub content_rect: Rect<Length>,
pub padding: Sides<Length>,
pub border: Sides<Length>,
pub margin: Sides<Length>,
pub block_margins_collapsed_with_children: CollapsedBlockMargins,
}
pub(crate) struct CollapsedBlockMargins {
pub collapsed_through: bool,
pub start: CollapsedMargin,
pub end: CollapsedMargin,
}
#[derive(Clone, Copy)]
pub(crate) struct CollapsedMargin {
max_positive: Length,
min_negative: Length,
}
/// Can contain child fragments with relative coordinates, but does not contribute to painting itself.
pub(crate) struct AnonymousFragment {
pub rect: Rect<Length>,
pub children: Vec<Fragment>,
pub mode: (WritingMode, Direction),
}
pub(crate) struct TextFragment {
pub parent_style: ServoArc<ComputedValues>,
pub content_rect: Rect<Length>,
pub ascent: Length,
pub font_key: FontInstanceKey,
pub glyphs: Vec<Arc<GlyphStore>>,
}
pub(crate) struct ImageFragment {
pub style: ServoArc<ComputedValues>,
pub content_rect: Rect<Length>,
pub image_key: ImageKey,
}
impl AnonymousFragment {
pub fn no_op(mode: (WritingMode, Direction)) -> Self {
Self {
children: vec![],
rect: Rect::zero(),
mode,
}
}
}
impl BoxFragment {
pub fn border_rect(&self) -> Rect<Length> {
self.content_rect
.inflate(&self.padding)
.inflate(&self.border)
}
}
impl CollapsedBlockMargins {
pub fn from_margin(margin: &Sides<Length>) -> Self {
Self {
collapsed_through: false,
start: CollapsedMargin::new(margin.block_start),
end: CollapsedMargin::new(margin.block_end),
}
}
pub fn zero() -> Self {
Self {
collapsed_through: false,
start: CollapsedMargin::zero(),
end: CollapsedMargin::zero(),
}
}
}
impl CollapsedMargin {
pub fn zero() -> Self {
Self {
max_positive: Length::zero(),
min_negative: Length::zero(),
}
}
pub fn new(margin: Length) -> Self {
Self {
max_positive: margin.max(Length::zero()),
min_negative: margin.min(Length::zero()),
}
}
pub fn adjoin(&self, other: &Self) -> Self {
Self {
max_positive: self.max_positive.max(other.max_positive),
min_negative: self.min_negative.min(other.min_negative),
}
}
pub fn adjoin_assign(&mut self, other: &Self) {
*self = self.adjoin(other);
}
pub fn solve(&self) -> Length {
self.max_positive + self.min_negative
}
}