servo/components/layout_2020/geom.rs
Simon Sapin 13e494d74f More compact debug output for CSS values
```
Rect {
    start_corner: Vec2 { i: 0.0 px, b: 0.0 px },
    size: Vec2 { i: 1024.0 px, b: 20.0 px },
}
```

… instead of:

```
Rect {
    start_corner: Vec2 {
        inline: CSSPixelLength(
            0.0,
        ),
        block: CSSPixelLength(
            0.0,
        ),
    },
    size: Vec2 {
        inline: CSSPixelLength(
            1024.0,
        ),
        block: CSSPixelLength(
            0.0,
        ),
    },
}
```
2019-10-24 10:44:31 +02:00

366 lines
10 KiB
Rust

/* 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::style_ext::{Direction, WritingMode};
use std::fmt;
use std::ops::{Add, AddAssign, Sub};
use style::values::computed::{Length, LengthOrAuto, LengthPercentage, LengthPercentageOrAuto};
use style::Zero;
use style_traits::CSSPixel;
pub type Point<U> = euclid::Point2D<f32, U>;
pub type Size<U> = euclid::Size2D<f32, U>;
pub type Rect<U> = euclid::Rect<f32, U>;
pub(crate) mod physical {
#[derive(Clone)]
pub(crate) struct Vec2<T> {
pub x: T,
pub y: T,
}
#[derive(Clone, Debug)]
pub(crate) struct Rect<T> {
pub top_left: Vec2<T>,
pub size: Vec2<T>,
}
#[derive(Clone, Debug)]
pub(crate) struct Sides<T> {
pub top: T,
pub left: T,
pub bottom: T,
pub right: T,
}
}
pub(crate) mod flow_relative {
#[derive(Clone)]
pub(crate) struct Vec2<T> {
pub inline: T,
pub block: T,
}
#[derive(Clone, Debug)]
pub(crate) struct Rect<T> {
pub start_corner: Vec2<T>,
pub size: Vec2<T>,
}
#[derive(Clone, Debug)]
pub(crate) struct Sides<T> {
pub inline_start: T,
pub inline_end: T,
pub block_start: T,
pub block_end: T,
}
}
impl<T: fmt::Debug> fmt::Debug for physical::Vec2<T> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
// Not using f.debug_struct on purpose here, to keep {:?} output somewhat compact
f.write_str("Vec2 { x: ")?;
self.x.fmt(f)?;
f.write_str(", y: ")?;
self.y.fmt(f)?;
f.write_str(" }")
}
}
impl<T: fmt::Debug> fmt::Debug for flow_relative::Vec2<T> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
// Not using f.debug_struct on purpose here, to keep {:?} output somewhat compact
f.write_str("Vec2 { i: ")?;
self.inline.fmt(f)?;
f.write_str(", b: ")?;
self.block.fmt(f)?;
f.write_str(" }")
}
}
impl<T> Add<&'_ physical::Vec2<T>> for &'_ physical::Vec2<T>
where
T: Add<Output = T> + Copy,
{
type Output = physical::Vec2<T>;
fn add(self, other: &'_ physical::Vec2<T>) -> Self::Output {
physical::Vec2 {
x: self.x + other.x,
y: self.y + other.y,
}
}
}
impl<T: Clone> physical::Vec2<T> {
pub fn size_to_flow_relative(&self, mode: (WritingMode, Direction)) -> flow_relative::Vec2<T> {
// https://drafts.csswg.org/css-writing-modes/#logical-to-physical
let (i, b) = if let (WritingMode::HorizontalTb, _) = mode {
(&self.x, &self.y)
} else {
(&self.y, &self.x)
};
flow_relative::Vec2 {
inline: i.clone(),
block: b.clone(),
}
}
}
impl<T> Add<&'_ flow_relative::Vec2<T>> for &'_ flow_relative::Vec2<T>
where
T: Add<Output = T> + Copy,
{
type Output = flow_relative::Vec2<T>;
fn add(self, other: &'_ flow_relative::Vec2<T>) -> Self::Output {
flow_relative::Vec2 {
inline: self.inline + other.inline,
block: self.block + other.block,
}
}
}
impl<T> AddAssign<&'_ flow_relative::Vec2<T>> for flow_relative::Vec2<T>
where
T: AddAssign<T> + Copy,
{
fn add_assign(&mut self, other: &'_ flow_relative::Vec2<T>) {
self.inline += other.inline;
self.block += other.block;
}
}
impl flow_relative::Vec2<Length> {
pub fn zero() -> Self {
Self {
inline: Length::zero(),
block: Length::zero(),
}
}
}
impl flow_relative::Sides<Length> {
pub fn zero() -> Self {
Self {
inline_start: Length::zero(),
inline_end: Length::zero(),
block_start: Length::zero(),
block_end: Length::zero(),
}
}
}
impl flow_relative::Rect<Length> {
pub fn zero() -> Self {
Self {
start_corner: flow_relative::Vec2::zero(),
size: flow_relative::Vec2::zero(),
}
}
}
impl<T: Clone> flow_relative::Vec2<T> {
pub fn size_to_physical(&self, mode: (WritingMode, Direction)) -> physical::Vec2<T> {
// https://drafts.csswg.org/css-writing-modes/#logical-to-physical
let (x, y) = if let (WritingMode::HorizontalTb, _) = mode {
(&self.inline, &self.block)
} else {
(&self.block, &self.inline)
};
physical::Vec2 {
x: x.clone(),
y: y.clone(),
}
}
}
impl From<physical::Vec2<Length>> for Point<CSSPixel> {
fn from(v: physical::Vec2<Length>) -> Self {
Point::from_lengths(v.x.into(), v.y.into())
}
}
impl<T: Clone> physical::Sides<T> {
pub fn to_flow_relative(&self, mode: (WritingMode, Direction)) -> flow_relative::Sides<T> {
use Direction::*;
use WritingMode::*;
// https://drafts.csswg.org/css-writing-modes/#logical-to-physical
let (bs, be) = match mode.0 {
HorizontalTb => (&self.top, &self.bottom),
VerticalRl => (&self.right, &self.left),
VerticalLr => (&self.left, &self.right),
};
let (is, ie) = match mode {
(HorizontalTb, Ltr) => (&self.left, &self.right),
(HorizontalTb, Rtl) => (&self.right, &self.left),
(VerticalRl, Ltr) | (VerticalLr, Ltr) => (&self.top, &self.bottom),
(VerticalRl, Rtl) | (VerticalLr, Rtl) => (&self.bottom, &self.top),
};
flow_relative::Sides {
inline_start: is.clone(),
inline_end: ie.clone(),
block_start: bs.clone(),
block_end: be.clone(),
}
}
}
impl<T> flow_relative::Sides<T> {
pub fn map<U>(&self, f: impl Fn(&T) -> U) -> flow_relative::Sides<U> {
flow_relative::Sides {
inline_start: f(&self.inline_start),
inline_end: f(&self.inline_end),
block_start: f(&self.block_start),
block_end: f(&self.block_end),
}
}
pub fn map_inline_and_block_axes<U>(
&self,
inline_f: impl Fn(&T) -> U,
block_f: impl Fn(&T) -> U,
) -> flow_relative::Sides<U> {
flow_relative::Sides {
inline_start: inline_f(&self.inline_start),
inline_end: inline_f(&self.inline_end),
block_start: block_f(&self.block_start),
block_end: block_f(&self.block_end),
}
}
pub fn inline_sum(&self) -> T::Output
where
T: Add + Copy,
{
self.inline_start + self.inline_end
}
pub fn block_sum(&self) -> T::Output
where
T: Add + Copy,
{
self.block_start + self.block_end
}
pub fn start_corner(&self) -> flow_relative::Vec2<T>
where
T: Clone,
{
flow_relative::Vec2 {
inline: self.inline_start.clone(),
block: self.block_start.clone(),
}
}
}
impl flow_relative::Sides<LengthPercentage> {
pub fn percentages_relative_to(&self, basis: Length) -> flow_relative::Sides<Length> {
self.map(|s| s.percentage_relative_to(basis))
}
}
impl flow_relative::Sides<LengthPercentageOrAuto> {
pub fn percentages_relative_to(&self, basis: Length) -> flow_relative::Sides<LengthOrAuto> {
self.map(|s| s.percentage_relative_to(basis))
}
}
impl flow_relative::Sides<LengthOrAuto> {
pub fn auto_is(&self, f: impl Fn() -> Length) -> flow_relative::Sides<Length> {
self.map(|s| s.auto_is(&f))
}
}
impl<T> Add<&'_ flow_relative::Sides<T>> for &'_ flow_relative::Sides<T>
where
T: Add<Output = T> + Copy,
{
type Output = flow_relative::Sides<T>;
fn add(self, other: &'_ flow_relative::Sides<T>) -> Self::Output {
flow_relative::Sides {
inline_start: self.inline_start + other.inline_start,
inline_end: self.inline_end + other.inline_end,
block_start: self.block_start + other.block_start,
block_end: self.block_end + other.block_end,
}
}
}
impl<T> flow_relative::Rect<T> {
pub fn inflate(&self, sides: &flow_relative::Sides<T>) -> Self
where
T: Add<Output = T> + Copy,
T: Sub<Output = T> + Copy,
{
flow_relative::Rect {
start_corner: flow_relative::Vec2 {
inline: self.start_corner.inline - sides.inline_start,
block: self.start_corner.block - sides.block_start,
},
size: flow_relative::Vec2 {
inline: self.size.inline + sides.inline_sum(),
block: self.size.block + sides.block_sum(),
},
}
}
pub fn to_physical(
&self,
mode: (WritingMode, Direction),
// Will be needed for other writing modes
// FIXME: what if the containing block has a different mode?
// https://drafts.csswg.org/css-writing-modes/#orthogonal-flows
_containing_block: &physical::Rect<T>,
) -> physical::Rect<T>
where
T: Clone,
{
// Top-left corner
let (tl_x, tl_y) = if let (WritingMode::HorizontalTb, Direction::Ltr) = mode {
(&self.start_corner.inline, &self.start_corner.block)
} else {
unimplemented!()
};
physical::Rect {
top_left: physical::Vec2 {
x: tl_x.clone(),
y: tl_y.clone(),
},
size: self.size.size_to_physical(mode),
}
}
}
impl<T> physical::Rect<T> {
pub fn translate(&self, by: &physical::Vec2<T>) -> Self
where
T: Add<Output = T> + Copy,
{
physical::Rect {
top_left: &self.top_left + by,
size: self.size.clone(),
}
}
}
impl From<physical::Rect<Length>> for Rect<CSSPixel> {
fn from(r: physical::Rect<Length>) -> Self {
Rect {
origin: Point::new(r.top_left.x.px(), r.top_left.y.px()),
size: Size::new(r.size.x.px(), r.size.y.px()),
}
}
}
impl From<physical::Rect<Length>> for webrender_api::units::LayoutRect {
fn from(r: physical::Rect<Length>) -> Self {
Rect {
origin: Point::new(r.top_left.x.px(), r.top_left.y.px()),
size: Size::new(r.size.x.px(), r.size.y.px()),
}
}
}