Quelle logical_geometry.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/. */
//! Geometry in flow-relative space.
use crate::properties::style_structs;
use euclid::default::{Point2D, Rect, SideOffsets2D, Size2D};
use euclid::num::Zero;
use std::cmp::{max, min};
use std::fmt::{self, Debug, Error, Formatter};
use std::ops::{Add, Sub};
use unicode_bidi as bidi;
pub enum BlockFlowDirection {
TopToBottom,
RightToLeft,
LeftToRight,
}
pub enum InlineBaseDirection {
LeftToRight,
RightToLeft,
}
// TODO: improve the readability of the WritingMode serialization, refer to the Debug:fmt()
#[derive(Clone, Copy, Debug, Eq, MallocSizeOf, PartialEq, Serialize)]
#[repr(C)]
pub struct WritingMode(u8);
bitflags!(
impl WritingMode: u8 {
/// A vertical writing mode; writing-mode is vertical-rl,
/// vertical-lr, sideways-lr, or sideways-rl.
const VERTICAL = 1 << 0;
/// The inline flow direction is reversed against the physical
/// direction (i.e. right-to-left or bottom-to-top); writing-mode is
/// sideways-lr or direction is rtl (but not both).
///
/// (This bit can be derived from the others, but we store it for
/// convenience.)
const INLINE_REVERSED = 1 << 1;
/// A vertical writing mode whose block progression direction is left-
/// to-right; writing-mode is vertical-lr or sideways-lr.
///
/// Never set without VERTICAL.
const VERTICAL_LR = 1 << 2;
/// The line-over/line-under sides are inverted with respect to the
/// block-start/block-end edge; writing-mode is vertical-lr.
///
/// Never set without VERTICAL and VERTICAL_LR.
const LINE_INVERTED = 1 << 3;
/// direction is rtl.
const RTL = 1 << 4;
/// All text within a vertical writing mode is displayed sideways
/// and runs top-to-bottom or bottom-to-top; set in these cases:
///
/// * writing-mode: sideways-rl;
/// * writing-mode: sideways-lr;
///
/// Never set without VERTICAL.
const VERTICAL_SIDEWAYS = 1 << 5;
/// Similar to VERTICAL_SIDEWAYS, but is set via text-orientation;
/// set in these cases:
///
/// * writing-mode: vertical-rl; text-orientation: sideways;
/// * writing-mode: vertical-lr; text-orientation: sideways;
///
/// Never set without VERTICAL.
const TEXT_SIDEWAYS = 1 << 6;
/// Horizontal text within a vertical writing mode is displayed with each
/// glyph upright; set in these cases:
///
/// * writing-mode: vertical-rl; text-orientation: upright;
/// * writing-mode: vertical-lr: text-orientation: upright;
///
/// Never set without VERTICAL.
const UPRIGHT = 1 << 7;
}
);
impl WritingMode {
/// Return a WritingMode bitflags from the relevant CSS properties.
pub fn new(inheritedbox_style: &style_structs::InheritedBox) -> Self {
use crate::properties::longhands::direction::computed_value::T as Direction;
use crate::properties::longhands::writing_mode::computed_value::T as SpecifiedWriti ngMode;
let mut flags = WritingMode::empty();
let direction = inheritedbox_style.clone_direction();
let writing_mode = inheritedbox_style.clone_writing_mode();
match direction {
Direction::Ltr => {},
Direction::Rtl => {
flags.insert(WritingMode::RTL);
},
}
match writing_mode {
SpecifiedWritingMode::HorizontalTb => {
if direction == Direction::Rtl {
flags.insert(WritingMode::INLINE_REVERSED);
}
},
SpecifiedWritingMode::VerticalRl => {
flags.insert(WritingMode::VERTICAL);
if direction == Direction::Rtl {
flags.insert(WritingMode::INLINE_REVERSED);
}
},
SpecifiedWritingMode::VerticalLr => {
flags.insert(WritingMode::VERTICAL);
flags.insert(WritingMode::VERTICAL_LR);
flags.insert(WritingMode::LINE_INVERTED);
if direction == Direction::Rtl {
flags.insert(WritingMode::INLINE_REVERSED);
}
},
#[cfg(feature = "gecko")]
SpecifiedWritingMode::SidewaysRl => {
flags.insert(WritingMode::VERTICAL);
flags.insert(WritingMode::VERTICAL_SIDEWAYS);
if direction == Direction::Rtl {
flags.insert(WritingMode::INLINE_REVERSED);
}
},
#[cfg(feature = "gecko")]
SpecifiedWritingMode::SidewaysLr => {
flags.insert(WritingMode::VERTICAL);
flags.insert(WritingMode::VERTICAL_LR);
flags.insert(WritingMode::VERTICAL_SIDEWAYS);
if direction == Direction::Ltr {
flags.insert(WritingMode::INLINE_REVERSED);
}
},
}
#[cfg(feature = "gecko")]
{
use crate::properties::longhands::text_orientation::computed_value::T as TextOrientation;
// text-orientation only has an effect for vertical-rl and
// vertical-lr values of writing-mode.
match writing_mode {
SpecifiedWritingMode::VerticalRl | SpecifiedWritingMode::VerticalLr => {
match inheritedbox_style.clone_text_orientation() {
TextOrientation::Mixed => {},
TextOrientation::Upright => {
flags.insert(WritingMode::UPRIGHT);
// https://drafts.csswg.org/css-writing-modes-3/#valdef-text-orientation-upright:
//
// > This value causes the used value of direction
// > to be ltr, and for the purposes of bidi
// > reordering, causes all characters to be treated
// > as strong LTR.
flags.remove(WritingMode::RTL);
flags.remove(WritingMode::INLINE_REVERSED);
},
TextOrientation::Sideways => {
flags.insert(WritingMode::TEXT_SIDEWAYS);
},
}
},
_ => {},
}
}
flags
}
/// Returns the `horizontal-tb` value.
pub fn horizontal_tb() -> Self {
Self::empty()
}
#[inline]
pub fn is_vertical(&self) -> bool {
self.intersects(WritingMode::VERTICAL)
}
#[inline]
pub fn is_horizontal(&self) -> bool {
!self.is_vertical()
}
/// Assuming .is_vertical(), does the block direction go left to right?
#[inline]
pub fn is_vertical_lr(&self) -> bool {
self.intersects(WritingMode::VERTICAL_LR)
}
/// Assuming .is_vertical(), does the inline direction go top to bottom?
#[inline]
pub fn is_inline_tb(&self) -> bool {
// https://drafts.csswg.org/css-writing-modes-3/#logical-to-physical
!self.intersects(WritingMode::INLINE_REVERSED)
}
#[inline]
pub fn is_bidi_ltr(&self) -> bool {
!self.intersects(WritingMode::RTL)
}
#[inline]
pub fn is_sideways(&self) -> bool {
self.intersects(WritingMode::VERTICAL_SIDEWAYS | WritingMode::TEXT_SIDEWAYS)
}
#[inline]
pub fn is_upright(&self) -> bool {
self.intersects(WritingMode::UPRIGHT)
}
/// https://drafts.csswg.org/css-writing-modes/#logical-to-physical
///
/// | Return | line-left is… | line-right is… |
/// |---------|---------------|----------------|
/// | `true` | inline-start | inline-end |
/// | `false` | inline-end | inline-start |
#[inline]
pub fn line_left_is_inline_start(&self) -> bool {
// https://drafts.csswg.org/css-writing-modes/#inline-start
// “For boxes with a used direction value of ltr, this means the line-left side.
// For boxes with a used direction value of rtl, this means the line-right side.”
self.is_bidi_ltr()
}
#[inline]
pub fn inline_start_physical_side(&self) -> PhysicalSide {
match (self.is_vertical(), self.is_inline_tb(), self.is_bidi_ltr()) {
(false, _, true) => PhysicalSide::Left,
(false, _, false) => PhysicalSide::Right,
(true, true, _) => PhysicalSide::Top,
(true, false, _) => PhysicalSide::Bottom,
}
}
#[inline]
pub fn inline_end_physical_side(&self) -> PhysicalSide {
match (self.is_vertical(), self.is_inline_tb(), self.is_bidi_ltr()) {
(false, _, true) => PhysicalSide::Right,
(false, _, false) => PhysicalSide::Left,
(true, true, _) => PhysicalSide::Bottom,
(true, false, _) => PhysicalSide::Top,
}
}
#[inline]
pub fn block_start_physical_side(&self) -> PhysicalSide {
match (self.is_vertical(), self.is_vertical_lr()) {
(false, _) => PhysicalSide::Top,
(true, true) => PhysicalSide::Left,
(true, false) => PhysicalSide::Right,
}
}
#[inline]
pub fn block_end_physical_side(&self) -> PhysicalSide {
match (self.is_vertical(), self.is_vertical_lr()) {
(false, _) => PhysicalSide::Bottom,
(true, true) => PhysicalSide::Right,
(true, false) => PhysicalSide::Left,
}
}
#[inline]
pub fn start_start_physical_corner(&self) -> PhysicalCorner {
PhysicalCorner::from_sides(
self.block_start_physical_side(),
self.inline_start_physical_side(),
)
}
#[inline]
pub fn start_end_physical_corner(&self) -> PhysicalCorner {
PhysicalCorner::from_sides(
self.block_start_physical_side(),
self.inline_end_physical_side(),
)
}
#[inline]
pub fn end_start_physical_corner(&self) -> PhysicalCorner {
PhysicalCorner::from_sides(
self.block_end_physical_side(),
self.inline_start_physical_side(),
)
}
#[inline]
pub fn end_end_physical_corner(&self) -> PhysicalCorner {
PhysicalCorner::from_sides(
self.block_end_physical_side(),
self.inline_end_physical_side(),
)
}
#[inline]
pub fn block_flow_direction(&self) -> BlockFlowDirection {
match (self.is_vertical(), self.is_vertical_lr()) {
(false, _) => BlockFlowDirection::TopToBottom,
(true, true) => BlockFlowDirection::LeftToRight,
(true, false) => BlockFlowDirection::RightToLeft,
}
}
#[inline]
pub fn inline_base_direction(&self) -> InlineBaseDirection {
if self.intersects(WritingMode::RTL) {
InlineBaseDirection::RightToLeft
} else {
InlineBaseDirection::LeftToRight
}
}
#[inline]
/// The default bidirectional embedding level for this writing mode.
///
/// Returns bidi level 0 if the mode is LTR, or 1 otherwise.
pub fn to_bidi_level(&self) -> bidi::Level {
if self.is_bidi_ltr() {
bidi::Level::ltr()
} else {
bidi::Level::rtl()
}
}
#[inline]
/// Is the text layout vertical?
pub fn is_text_vertical(&self) -> bool {
self.is_vertical() && !self.is_sideways()
}
}
impl fmt::Display for WritingMode {
fn fmt(&self, formatter: &mut Formatter) -> Result<(), Error> {
if self.is_vertical() {
write!(formatter, "V")?;
if self.is_vertical_lr() {
write!(formatter, " LR")?;
} else {
write!(formatter, " RL")?;
}
if self.is_sideways() {
write!(formatter, " Sideways")?;
}
if self.intersects(WritingMode::LINE_INVERTED) {
write!(formatter, " Inverted")?;
}
} else {
write!(formatter, "H")?;
}
if self.is_bidi_ltr() {
write!(formatter, " LTR")
} else {
write!(formatter, " RTL")
}
}
}
/// Wherever logical geometry is used, the writing mode is known based on context:
/// every method takes a `mode` parameter.
/// However, this context is easy to get wrong.
/// In debug builds only, logical geometry objects store their writing mode
/// (in addition to taking it as a parameter to methods) and check it.
/// In non-debug builds, make this storage zero-size and the checks no-ops.
#[cfg(not(debug_assertions))]
#[derive(Clone, Copy, Eq, PartialEq)]
#[cfg_attr(feature = "servo", derive(Serialize))]
struct DebugWritingMode;
#[cfg(debug_assertions)]
#[derive(Clone, Copy, Eq, PartialEq)]
#[cfg_attr(feature = "servo", derive(Serialize))]
struct DebugWritingMode {
mode: WritingMode,
}
#[cfg(not(debug_assertions))]
impl DebugWritingMode {
#[inline]
fn check(&self, _other: WritingMode) {}
#[inline]
fn check_debug(&self, _other: DebugWritingMode) {}
#[inline]
fn new(_mode: WritingMode) -> DebugWritingMode {
DebugWritingMode
}
}
#[cfg(debug_assertions)]
impl DebugWritingMode {
#[inline]
fn check(&self, other: WritingMode) {
assert_eq!(self.mode, other)
}
#[inline]
fn check_debug(&self, other: DebugWritingMode) {
assert_eq!(self.mode, other.mode)
}
#[inline]
fn new(mode: WritingMode) -> DebugWritingMode {
DebugWritingMode { mode }
}
}
impl Debug for DebugWritingMode {
#[cfg(not(debug_assertions))]
fn fmt(&self, formatter: &mut Formatter) -> Result<(), Error> {
write!(formatter, "?")
}
#[cfg(debug_assertions)]
fn fmt(&self, formatter: &mut Formatter) -> Result<(), Error> {
write!(formatter, "{}", self.mode)
}
}
// Used to specify the logical direction.
#[derive(Clone, Copy, Debug, PartialEq)]
#[cfg_attr(feature = "servo", derive(Serialize))]
pub enum Direction {
Inline,
Block,
}
/// A 2D size in flow-relative dimensions
#[derive(Clone, Copy, Eq, PartialEq)]
#[cfg_attr(feature = "servo", derive(Serialize))]
pub struct LogicalSize<T> {
pub inline: T, // inline-size, a.k.a. logical width, a.k.a. measure
pub block: T, // block-size, a.k.a. logical height, a.k.a. extent
debug_writing_mode: DebugWritingMode,
}
impl<T: Debug> Debug for LogicalSize<T> {
fn fmt(&self, formatter: &mut Formatter) -> Result<(), Error> {
write!(
formatter,
"LogicalSize({:?}, i{:?}×b{:?})",
self.debug_writing_mode, self.inline, self.block
)
}
}
// Can not implement the Zero trait: its zero() method does not have the `mode` parameter.
impl<T: Zero> LogicalSize<T> {
#[inline]
pub fn zero(mode: WritingMode) -> LogicalSize<T> {
LogicalSize {
inline: Zero::zero(),
block: Zero::zero(),
debug_writing_mode: DebugWritingMode::new(mode),
}
}
}
impl<T> LogicalSize<T> {
#[inline]
pub fn new(mode: WritingMode, inline: T, block: T) -> LogicalSize<T> {
LogicalSize {
inline: inline,
block: block,
debug_writing_mode: DebugWritingMode::new(mode),
}
}
#[inline]
pub fn from_physical(mode: WritingMode, size: Size2D<T>) -> LogicalSize<T> {
if mode.is_vertical() {
LogicalSize::new(mode, size.height, size.width)
} else {
LogicalSize::new(mode, size.width, size.height)
}
}
}
impl<T: Clone> LogicalSize<T> {
#[inline]
pub fn width(&self, mode: WritingMode) -> T {
self.debug_writing_mode.check(mode);
if mode.is_vertical() {
self.block.clone()
} else {
self.inline.clone()
}
}
#[inline]
pub fn set_width(&mut self, mode: WritingMode, width: T) {
self.debug_writing_mode.check(mode);
if mode.is_vertical() {
self.block = width
} else {
self.inline = width
}
}
#[inline]
pub fn height(&self, mode: WritingMode) -> T {
self.debug_writing_mode.check(mode);
if mode.is_vertical() {
self.inline.clone()
} else {
self.block.clone()
}
}
#[inline]
pub fn set_height(&mut self, mode: WritingMode, height: T) {
self.debug_writing_mode.check(mode);
if mode.is_vertical() {
self.inline = height
} else {
self.block = height
}
}
#[inline]
pub fn to_physical(&self, mode: WritingMode) -> Size2D<T> {
self.debug_writing_mode.check(mode);
if mode.is_vertical() {
Size2D::new(self.block.clone(), self.inline.clone())
} else {
Size2D::new(self.inline.clone(), self.block.clone())
}
}
#[inline]
pub fn convert(&self, mode_from: WritingMode, mode_to: WritingMode) -> LogicalSize<T> {
if mode_from == mode_to {
self.debug_writing_mode.check(mode_from);
self.clone()
} else {
LogicalSize::from_physical(mode_to, self.to_physical(mode_from))
}
}
}
impl<T: Add<T, Output = T>> Add for LogicalSize<T> {
type Output = LogicalSize<T>;
#[inline]
fn add(self, other: LogicalSize<T>) -> LogicalSize<T> {
self.debug_writing_mode
.check_debug(other.debug_writing_mode);
LogicalSize {
debug_writing_mode: self.debug_writing_mode,
inline: self.inline + other.inline,
block: self.block + other.block,
}
}
}
impl<T: Sub<T, Output = T>> Sub for LogicalSize<T> {
type Output = LogicalSize<T>;
#[inline]
fn sub(self, other: LogicalSize<T>) -> LogicalSize<T> {
self.debug_writing_mode
.check_debug(other.debug_writing_mode);
LogicalSize {
debug_writing_mode: self.debug_writing_mode,
inline: self.inline - other.inline,
block: self.block - other.block,
}
}
}
/// A 2D point in flow-relative dimensions
#[derive(Clone, Copy, Eq, PartialEq)]
#[cfg_attr(feature = "servo", derive(Serialize))]
pub struct LogicalPoint<T> {
/// inline-axis coordinate
pub i: T,
/// block-axis coordinate
pub b: T,
debug_writing_mode: DebugWritingMode,
}
impl<T: Debug> Debug for LogicalPoint<T> {
fn fmt(&self, formatter: &mut Formatter) -> Result<(), Error> {
write!(
formatter,
"LogicalPoint({:?} (i{:?}, b{:?}))",
self.debug_writing_mode, self.i, self.b
)
}
}
// Can not implement the Zero trait: its zero() method does not have the `mode` parameter.
impl<T: Zero> LogicalPoint<T> {
#[inline]
pub fn zero(mode: WritingMode) -> LogicalPoint<T> {
LogicalPoint {
i: Zero::zero(),
b: Zero::zero(),
debug_writing_mode: DebugWritingMode::new(mode),
}
}
}
impl<T: Copy> LogicalPoint<T> {
#[inline]
pub fn new(mode: WritingMode, i: T, b: T) -> LogicalPoint<T> {
LogicalPoint {
i: i,
b: b,
debug_writing_mode: DebugWritingMode::new(mode),
}
}
}
impl<T: Copy + Sub<T, Output = T>> LogicalPoint<T> {
#[inline]
pub fn from_physical(
mode: WritingMode,
point: Point2D<T>,
container_size: Size2D<T>,
) -> LogicalPoint<T> {
if mode.is_vertical() {
LogicalPoint {
i: if mode.is_inline_tb() {
point.y
} else {
container_size.height - point.y
},
b: if mode.is_vertical_lr() {
point.x
} else {
container_size.width - point.x
},
debug_writing_mode: DebugWritingMode::new(mode),
}
} else {
LogicalPoint {
i: if mode.is_bidi_ltr() {
point.x
} else {
container_size.width - point.x
},
b: point.y,
debug_writing_mode: DebugWritingMode::new(mode),
}
}
}
#[inline]
pub fn x(&self, mode: WritingMode, container_size: Size2D<T>) -> T {
self.debug_writing_mode.check(mode);
if mode.is_vertical() {
if mode.is_vertical_lr() {
self.b
} else {
container_size.width - self.b
}
} else {
if mode.is_bidi_ltr() {
self.i
} else {
container_size.width - self.i
}
}
}
#[inline]
pub fn set_x(&mut self, mode: WritingMode, x: T, container_size: Size2D<T>) {
self.debug_writing_mode.check(mode);
if mode.is_vertical() {
self.b = if mode.is_vertical_lr() {
x
} else {
container_size.width - x
}
} else {
self.i = if mode.is_bidi_ltr() {
x
} else {
container_size.width - x
}
}
}
#[inline]
pub fn y(&self, mode: WritingMode, container_size: Size2D<T>) -> T {
self.debug_writing_mode.check(mode);
if mode.is_vertical() {
if mode.is_inline_tb() {
self.i
} else {
container_size.height - self.i
}
} else {
self.b
}
}
#[inline]
pub fn set_y(&mut self, mode: WritingMode, y: T, container_size: Size2D<T>) {
self.debug_writing_mode.check(mode);
if mode.is_vertical() {
self.i = if mode.is_inline_tb() {
y
} else {
container_size.height - y
}
} else {
self.b = y
}
}
#[inline]
pub fn to_physical(&self, mode: WritingMode, container_size: Size2D<T>) -> Point2D<T> {
self.debug_writing_mode.check(mode);
if mode.is_vertical() {
Point2D::new(
if mode.is_vertical_lr() {
self.b
} else {
container_size.width - self.b
},
if mode.is_inline_tb() {
self.i
} else {
container_size.height - self.i
},
)
} else {
Point2D::new(
if mode.is_bidi_ltr() {
self.i
} else {
container_size.width - self.i
},
self.b,
)
}
}
#[inline]
pub fn convert(
&self,
mode_from: WritingMode,
mode_to: WritingMode,
container_size: Size2D<T>,
) -> LogicalPoint<T> {
if mode_from == mode_to {
self.debug_writing_mode.check(mode_from);
*self
} else {
LogicalPoint::from_physical(
mode_to,
self.to_physical(mode_from, container_size),
container_size,
)
}
}
}
impl<T: Copy + Add<T, Output = T>> LogicalPoint<T> {
/// This doesn’t really makes sense,
/// but happens when dealing with multiple origins.
#[inline]
pub fn add_point(&self, other: &LogicalPoint<T>) -> LogicalPoint<T> {
self.debug_writing_mode
.check_debug(other.debug_writing_mode);
LogicalPoint {
debug_writing_mode: self.debug_writing_mode,
i: self.i + other.i,
b: self.b + other.b,
}
}
}
impl<T: Copy + Add<T, Output = T>> Add<LogicalSize<T>> for LogicalPoint<T> {
type Output = LogicalPoint<T>;
#[inline]
fn add(self, other: LogicalSize<T>) -> LogicalPoint<T> {
self.debug_writing_mode
.check_debug(other.debug_writing_mode);
LogicalPoint {
debug_writing_mode: self.debug_writing_mode,
i: self.i + other.inline,
b: self.b + other.block,
}
}
}
impl<T: Copy + Sub<T, Output = T>> Sub<LogicalSize<T>> for LogicalPoint<T> {
type Output = LogicalPoint<T>;
#[inline]
fn sub(self, other: LogicalSize<T>) -> LogicalPoint<T> {
self.debug_writing_mode
.check_debug(other.debug_writing_mode);
LogicalPoint {
debug_writing_mode: self.debug_writing_mode,
i: self.i - other.inline,
b: self.b - other.block,
}
}
}
/// A "margin" in flow-relative dimensions
/// Represents the four sides of the margins, borders, or padding of a CSS box,
/// or a combination of those.
/// A positive "margin" can be added to a rectangle to obtain a bigger rectangle.
#[derive(Clone, Copy, Eq, PartialEq)]
#[cfg_attr(feature = "servo", derive(Serialize))]
pub struct LogicalMargin<T> {
pub block_start: T,
pub inline_end: T,
pub block_end: T,
pub inline_start: T,
debug_writing_mode: DebugWritingMode,
}
impl<T: Debug> Debug for LogicalMargin<T> {
fn fmt(&self, formatter: &mut Formatter) -> Result<(), Error> {
let writing_mode_string = if cfg!(debug_assertions) {
format!("{:?}, ", self.debug_writing_mode)
} else {
"".to_owned()
};
write!(
formatter,
"LogicalMargin({}i:{:?}..{:?} b:{:?}..{:?})",
writing_mode_string,
self.inline_start,
self.inline_end,
self.block_start,
self.block_end
)
}
}
impl<T: Zero> LogicalMargin<T> {
#[inline]
pub fn zero(mode: WritingMode) -> LogicalMargin<T> {
LogicalMargin {
block_start: Zero::zero(),
inline_end: Zero::zero(),
block_end: Zero::zero(),
inline_start: Zero::zero(),
debug_writing_mode: DebugWritingMode::new(mode),
}
}
}
impl<T> LogicalMargin<T> {
#[inline]
pub fn new(
mode: WritingMode,
block_start: T,
inline_end: T,
block_end: T,
inline_start: T,
) -> LogicalMargin<T> {
LogicalMargin {
block_start,
inline_end,
block_end,
inline_start,
debug_writing_mode: DebugWritingMode::new(mode),
}
}
#[inline]
pub fn from_physical(mode: WritingMode, offsets: SideOffsets2D<T>) -> LogicalMargin<T> {
let block_start;
let inline_end;
let block_end;
let inline_start;
if mode.is_vertical() {
if mode.is_vertical_lr() {
block_start = offsets.left;
block_end = offsets.right;
} else {
block_start = offsets.right;
block_end = offsets.left;
}
if mode.is_inline_tb() {
inline_start = offsets.top;
inline_end = offsets.bottom;
} else {
inline_start = offsets.bottom;
inline_end = offsets.top;
}
} else {
block_start = offsets.top;
block_end = offsets.bottom;
if mode.is_bidi_ltr() {
inline_start = offsets.left;
inline_end = offsets.right;
} else {
inline_start = offsets.right;
inline_end = offsets.left;
}
}
LogicalMargin::new(mode, block_start, inline_end, block_end, inline_start)
}
}
impl<T: Clone> LogicalMargin<T> {
#[inline]
pub fn new_all_same(mode: WritingMode, value: T) -> LogicalMargin<T> {
LogicalMargin::new(mode, value.clone(), value.clone(), value.clone(), value)
}
#[inline]
pub fn top(&self, mode: WritingMode) -> T {
self.debug_writing_mode.check(mode);
if mode.is_vertical() {
if mode.is_inline_tb() {
self.inline_start.clone()
} else {
self.inline_end.clone()
}
} else {
self.block_start.clone()
}
}
#[inline]
pub fn set_top(&mut self, mode: WritingMode, top: T) {
self.debug_writing_mode.check(mode);
if mode.is_vertical() {
if mode.is_inline_tb() {
self.inline_start = top
} else {
self.inline_end = top
}
} else {
self.block_start = top
}
}
#[inline]
pub fn right(&self, mode: WritingMode) -> T {
self.debug_writing_mode.check(mode);
if mode.is_vertical() {
if mode.is_vertical_lr() {
self.block_end.clone()
} else {
self.block_start.clone()
}
} else {
if mode.is_bidi_ltr() {
self.inline_end.clone()
} else {
self.inline_start.clone()
}
}
}
#[inline]
pub fn set_right(&mut self, mode: WritingMode, right: T) {
self.debug_writing_mode.check(mode);
if mode.is_vertical() {
if mode.is_vertical_lr() {
self.block_end = right
} else {
self.block_start = right
}
} else {
if mode.is_bidi_ltr() {
self.inline_end = right
} else {
self.inline_start = right
}
}
}
#[inline]
pub fn bottom(&self, mode: WritingMode) -> T {
self.debug_writing_mode.check(mode);
if mode.is_vertical() {
if mode.is_inline_tb() {
self.inline_end.clone()
} else {
self.inline_start.clone()
}
} else {
self.block_end.clone()
}
}
#[inline]
pub fn set_bottom(&mut self, mode: WritingMode, bottom: T) {
self.debug_writing_mode.check(mode);
if mode.is_vertical() {
if mode.is_inline_tb() {
self.inline_end = bottom
} else {
self.inline_start = bottom
}
} else {
self.block_end = bottom
}
}
#[inline]
pub fn left(&self, mode: WritingMode) -> T {
self.debug_writing_mode.check(mode);
if mode.is_vertical() {
if mode.is_vertical_lr() {
self.block_start.clone()
} else {
self.block_end.clone()
}
} else {
if mode.is_bidi_ltr() {
self.inline_start.clone()
} else {
self.inline_end.clone()
}
}
}
#[inline]
pub fn set_left(&mut self, mode: WritingMode, left: T) {
self.debug_writing_mode.check(mode);
if mode.is_vertical() {
if mode.is_vertical_lr() {
self.block_start = left
} else {
self.block_end = left
}
} else {
if mode.is_bidi_ltr() {
self.inline_start = left
} else {
self.inline_end = left
}
}
}
#[inline]
pub fn to_physical(&self, mode: WritingMode) -> SideOffsets2D<T> {
self.debug_writing_mode.check(mode);
let top;
let right;
let bottom;
let left;
if mode.is_vertical() {
if mode.is_vertical_lr() {
left = self.block_start.clone();
right = self.block_end.clone();
} else {
right = self.block_start.clone();
left = self.block_end.clone();
}
if mode.is_inline_tb() {
top = self.inline_start.clone();
bottom = self.inline_end.clone();
} else {
bottom = self.inline_start.clone();
top = self.inline_end.clone();
}
} else {
top = self.block_start.clone();
bottom = self.block_end.clone();
if mode.is_bidi_ltr() {
left = self.inline_start.clone();
right = self.inline_end.clone();
} else {
right = self.inline_start.clone();
left = self.inline_end.clone();
}
}
SideOffsets2D::new(top, right, bottom, left)
}
#[inline]
pub fn convert(&self, mode_from: WritingMode, mode_to: WritingMode) -> LogicalMargin<T> {
if mode_from == mode_to {
self.debug_writing_mode.check(mode_from);
self.clone()
} else {
LogicalMargin::from_physical(mode_to, self.to_physical(mode_from))
}
}
}
impl<T: PartialEq + Zero> LogicalMargin<T> {
#[inline]
pub fn is_zero(&self) -> bool {
self.block_start == Zero::zero() &&
self.inline_end == Zero::zero() &&
self.block_end == Zero::zero() &&
self.inline_start == Zero::zero()
}
}
impl<T: Copy + Add<T, Output = T>> LogicalMargin<T> {
#[inline]
pub fn inline_start_end(&self) -> T {
self.inline_start + self.inline_end
}
#[inline]
pub fn block_start_end(&self) -> T {
self.block_start + self.block_end
}
#[inline]
pub fn start_end(&self, direction: Direction) -> T {
match direction {
Direction::Inline => self.inline_start + self.inline_end,
Direction::Block => self.block_start + self.block_end,
}
}
#[inline]
pub fn top_bottom(&self, mode: WritingMode) -> T {
self.debug_writing_mode.check(mode);
if mode.is_vertical() {
self.inline_start_end()
} else {
self.block_start_end()
}
}
#[inline]
pub fn left_right(&self, mode: WritingMode) -> T {
self.debug_writing_mode.check(mode);
if mode.is_vertical() {
self.block_start_end()
} else {
self.inline_start_end()
}
}
}
impl<T: Add<T, Output = T>> Add for LogicalMargin<T> {
type Output = LogicalMargin<T>;
#[inline]
fn add(self, other: LogicalMargin<T>) -> LogicalMargin<T> {
self.debug_writing_mode
.check_debug(other.debug_writing_mode);
LogicalMargin {
debug_writing_mode: self.debug_writing_mode,
block_start: self.block_start + other.block_start,
inline_end: self.inline_end + other.inline_end,
block_end: self.block_end + other.block_end,
inline_start: self.inline_start + other.inline_start,
}
}
}
impl<T: Sub<T, Output = T>> Sub for LogicalMargin<T> {
type Output = LogicalMargin<T>;
#[inline]
fn sub(self, other: LogicalMargin<T>) -> LogicalMargin<T> {
self.debug_writing_mode
.check_debug(other.debug_writing_mode);
LogicalMargin {
debug_writing_mode: self.debug_writing_mode,
block_start: self.block_start - other.block_start,
inline_end: self.inline_end - other.inline_end,
block_end: self.block_end - other.block_end,
inline_start: self.inline_start - other.inline_start,
}
}
}
/// A rectangle in flow-relative dimensions
#[derive(Clone, Copy, Eq, PartialEq)]
#[cfg_attr(feature = "servo", derive(Serialize))]
pub struct LogicalRect<T> {
pub start: LogicalPoint<T>,
pub size: LogicalSize<T>,
debug_writing_mode: DebugWritingMode,
}
impl<T: Debug> Debug for LogicalRect<T> {
fn fmt(&self, formatter: &mut Formatter) -> Result<(), Error> {
let writing_mode_string = if cfg!(debug_assertions) {
format!("{:?}, ", self.debug_writing_mode)
} else {
"".to_owned()
};
write!(
formatter,
"LogicalRect({}i{:?}×b{:?}, @ (i{:?},b{:?}))",
writing_mode_string, self.size.inline, self.size.block, self.start.i, self.start.b
)
}
}
impl<T: Zero> LogicalRect<T> {
#[inline]
pub fn zero(mode: WritingMode) -> LogicalRect<T> {
LogicalRect {
start: LogicalPoint::zero(mode),
size: LogicalSize::zero(mode),
debug_writing_mode: DebugWritingMode::new(mode),
}
}
}
impl<T: Copy> LogicalRect<T> {
#[inline]
pub fn new(
mode: WritingMode,
inline_start: T,
block_start: T,
inline: T,
block: T,
) -> LogicalRect<T> {
LogicalRect {
start: LogicalPoint::new(mode, inline_start, block_start),
size: LogicalSize::new(mode, inline, block),
debug_writing_mode: DebugWritingMode::new(mode),
}
}
#[inline]
pub fn from_point_size(
mode: WritingMode,
start: LogicalPoint<T>,
size: LogicalSize<T>,
) -> LogicalRect<T> {
start.debug_writing_mode.check(mode);
size.debug_writing_mode.check(mode);
LogicalRect {
start: start,
size: size,
debug_writing_mode: DebugWritingMode::new(mode),
}
}
}
impl<T: Copy + Add<T, Output = T> + Sub<T, Output = T>> LogicalRect<T> {
#[inline]
pub fn from_physical(
mode: WritingMode,
rect: Rect<T>,
container_size: Size2D<T>,
) -> LogicalRect<T> {
let inline_start;
let block_start;
let inline;
let block;
if mode.is_vertical() {
inline = rect.size.height;
block = rect.size.width;
if mode.is_vertical_lr() {
block_start = rect.origin.x;
} else {
block_start = container_size.width - (rect.origin.x + rect.size.width);
}
if mode.is_inline_tb() {
inline_start = rect.origin.y;
} else {
inline_start = container_size.height - (rect.origin.y + rect.size.height);
}
} else {
inline = rect.size.width;
block = rect.size.height;
block_start = rect.origin.y;
if mode.is_bidi_ltr() {
inline_start = rect.origin.x;
} else {
inline_start = container_size.width - (rect.origin.x + rect.size.width);
}
}
LogicalRect {
start: LogicalPoint::new(mode, inline_start, block_start),
size: LogicalSize::new(mode, inline, block),
debug_writing_mode: DebugWritingMode::new(mode),
}
}
#[inline]
pub fn inline_end(&self) -> T {
self.start.i + self.size.inline
}
#[inline]
pub fn block_end(&self) -> T {
self.start.b + self.size.block
}
#[inline]
pub fn to_physical(&self, mode: WritingMode, container_size: Size2D<T>) -> Rect<T> {
self.debug_writing_mode.check(mode);
let x;
let y;
let width;
let height;
if mode.is_vertical() {
width = self.size.block;
height = self.size.inline;
if mode.is_vertical_lr() {
x = self.start.b;
} else {
x = container_size.width - self.block_end();
}
if mode.is_inline_tb() {
y = self.start.i;
} else {
y = container_size.height - self.inline_end();
}
} else {
width = self.size.inline;
height = self.size.block;
y = self.start.b;
if mode.is_bidi_ltr() {
x = self.start.i;
} else {
x = container_size.width - self.inline_end();
}
}
Rect {
origin: Point2D::new(x, y),
size: Size2D::new(width, height),
}
}
#[inline]
pub fn convert(
&self,
mode_from: WritingMode,
mode_to: WritingMode,
container_size: Size2D<T>,
) -> LogicalRect<T> {
if mode_from == mode_to {
self.debug_writing_mode.check(mode_from);
*self
} else {
LogicalRect::from_physical(
mode_to,
self.to_physical(mode_from, container_size),
container_size,
)
}
}
pub fn translate_by_size(&self, offset: LogicalSize<T>) -> LogicalRect<T> {
LogicalRect {
start: self.start + offset,
..*self
}
}
pub fn translate(&self, offset: &LogicalPoint<T>) -> LogicalRect<T> {
LogicalRect {
start: self.start +
LogicalSize {
inline: offset.i,
block: offset.b,
debug_writing_mode: offset.debug_writing_mode,
},
size: self.size,
debug_writing_mode: self.debug_writing_mode,
}
}
}
impl<T: Copy + Ord + Add<T, Output = T> + Sub<T, Output = T>> LogicalRect<T> {
#[inline]
pub fn union(&self, other: &LogicalRect<T>) -> LogicalRect<T> {
self.debug_writing_mode
.check_debug(other.debug_writing_mode);
let inline_start = min(self.start.i, other.start.i);
let block_start = min(self.start.b, other.start.b);
LogicalRect {
start: LogicalPoint {
i: inline_start,
b: block_start,
debug_writing_mode: self.debug_writing_mode,
},
size: LogicalSize {
inline: max(self.inline_end(), other.inline_end()) - inline_start,
block: max(self.block_end(), other.block_end()) - block_start,
debug_writing_mode: self.debug_writing_mode,
},
debug_writing_mode: self.debug_writing_mode,
}
}
}
impl<T: Copy + Add<T, Output = T> + Sub<T, Output = T>> Add<LogicalMargin<T>> for LogicalRect<T> {
type Output = LogicalRect<T>;
#[inline]
fn add(self, other: LogicalMargin<T>) -> LogicalRect<T> {
self.debug_writing_mode
.check_debug(other.debug_writing_mode);
LogicalRect {
start: LogicalPoint {
// Growing a rectangle on the start side means pushing its
// start point on the negative direction.
i: self.start.i - other.inline_start,
b: self.start.b - other.block_start,
debug_writing_mode: self.debug_writing_mode,
},
size: LogicalSize {
inline: self.size.inline + other.inline_start_end(),
block: self.size.block + other.block_start_end(),
debug_writing_mode: self.debug_writing_mode,
},
debug_writing_mode: self.debug_writing_mode,
}
}
}
impl<T: Copy + Add<T, Output = T> + Sub<T, Output = T>> Sub<LogicalMargin<T>> for LogicalRect<T> {
type Output = LogicalRect<T>;
#[inline]
fn sub(self, other: LogicalMargin<T>) -> LogicalRect<T> {
self.debug_writing_mode
.check_debug(other.debug_writing_mode);
LogicalRect {
start: LogicalPoint {
// Shrinking a rectangle on the start side means pushing its
// start point on the positive direction.
i: self.start.i + other.inline_start,
b: self.start.b + other.block_start,
debug_writing_mode: self.debug_writing_mode,
},
size: LogicalSize {
inline: self.size.inline - other.inline_start_end(),
block: self.size.block - other.block_start_end(),
debug_writing_mode: self.debug_writing_mode,
},
debug_writing_mode: self.debug_writing_mode,
}
}
}
#[derive(Clone, Copy, Debug, PartialEq)]
#[repr(u8)]
pub enum LogicalAxis {
Block = 0,
Inline,
}
impl LogicalAxis {
#[inline]
pub fn to_physical(self, wm: WritingMode) -> PhysicalAxis {
if wm.is_horizontal() == (self == Self::Inline) {
PhysicalAxis::Horizontal
} else {
PhysicalAxis::Vertical
}
}
}
#[derive(Clone, Copy, Debug, PartialEq)]
#[repr(u8)]
pub enum LogicalSide {
BlockStart = 0,
BlockEnd,
InlineStart,
InlineEnd,
}
impl LogicalSide {
fn is_block(self) -> bool {
matches!(self, Self::BlockStart | Self::BlockEnd)
}
#[inline]
pub fn to_physical(self, wm: WritingMode) -> PhysicalSide {
// Block mapping depends only on vertical+vertical-lr
static BLOCK_MAPPING: [[PhysicalSide; 2]; 4] = [
[PhysicalSide::Top, PhysicalSide::Bottom], // horizontal-tb
[PhysicalSide::Right, PhysicalSide::Left], // vertical-rl
[PhysicalSide::Bottom, PhysicalSide::Top], // (horizontal-bt)
[PhysicalSide::Left, PhysicalSide::Right], // vertical-lr
];
if self.is_block() {
let vertical = wm.is_vertical();
let lr = wm.is_vertical_lr();
let index = (vertical as usize) | ((lr as usize) << 1);
return BLOCK_MAPPING[index][self as usize];
}
// start = 0, end = 1
let edge = self as usize - 2;
// Inline axis sides depend on all three of writing-mode, text-orientation and direction,
// which are encoded in the VERTICAL, INLINE_REVERSED, VERTICAL_LR and LINE_INVERTED bits.
//
// bit 0 = the VERTICAL value
// bit 1 = the INLINE_REVERSED value
// bit 2 = the VERTICAL_LR value
// bit 3 = the LINE_INVERTED value
//
// Note that not all of these combinations can actually be specified via CSS: there is no
// horizontal-bt writing-mode, and no text-orientation value that produces "inverted"
// text. (The former 'sideways-left' value, no longer in the spec, would have produced
// this in vertical-rl mode.)
static INLINE_MAPPING: [[PhysicalSide; 2]; 16] = [
[PhysicalSide::Left, PhysicalSide::Right], // horizontal-tb ltr
[PhysicalSide::Top, PhysicalSide::Bottom], // vertical-rl ltr
[PhysicalSide::Right, PhysicalSide::Left], // horizontal-tb rtl
[PhysicalSide::Bottom, PhysicalSide::Top], // vertical-rl rtl
[PhysicalSide::Right, PhysicalSide::Left], // (horizontal-bt) (inverted) ltr
[PhysicalSide::Top, PhysicalSide::Bottom], // sideways-lr rtl
[PhysicalSide::Left, PhysicalSide::Right], // (horizontal-bt) (inverted) rtl
[PhysicalSide::Bottom, PhysicalSide::Top], // sideways-lr ltr
[PhysicalSide::Left, PhysicalSide::Right], // horizontal-tb (inverted) rtl
[PhysicalSide::Top, PhysicalSide::Bottom], // vertical-rl (inverted) rtl
[PhysicalSide::Right, PhysicalSide::Left], // horizontal-tb (inverted) ltr
[PhysicalSide::Bottom, PhysicalSide::Top], // vertical-rl (inverted) ltr
[PhysicalSide::Left, PhysicalSide::Right], // (horizontal-bt) ltr
[PhysicalSide::Top, PhysicalSide::Bottom], // vertical-lr ltr
[PhysicalSide::Right, PhysicalSide::Left], // (horizontal-bt) rtl
[PhysicalSide::Bottom, PhysicalSide::Top], // vertical-lr rtl
];
debug_assert!(
WritingMode::VERTICAL.bits() == 0x01 &&
WritingMode::INLINE_REVERSED.bits() == 0x02 &&
WritingMode::VERTICAL_LR.bits() == 0x04 &&
WritingMode::LINE_INVERTED.bits() == 0x08
);
let index = (wm.bits() & 0xF) as usize;
INLINE_MAPPING[index][edge]
}
}
#[derive(Clone, Copy, Debug, PartialEq)]
#[repr(u8)]
pub enum LogicalCorner {
StartStart = 0,
StartEnd,
EndStart,
EndEnd,
}
impl LogicalCorner {
#[inline]
pub fn to_physical(self, wm: WritingMode) -> PhysicalCorner {
static CORNER_TO_SIDES: [[LogicalSide; 2]; 4] = [
[LogicalSide::BlockStart, LogicalSide::InlineStart],
[LogicalSide::BlockStart, LogicalSide::InlineEnd],
[LogicalSide::BlockEnd, LogicalSide::InlineStart],
[LogicalSide::BlockEnd, LogicalSide::InlineEnd],
];
let [block, inline] = CORNER_TO_SIDES[self as usize];
let block = block.to_physical(wm);
let inline = inline.to_physical(wm);
PhysicalCorner::from_sides(block, inline)
}
}
#[derive(Clone, Copy, Debug, PartialEq)]
#[repr(u8)]
pub enum PhysicalAxis {
Vertical = 0,
Horizontal,
}
#[derive(Clone, Copy, Debug, PartialEq)]
#[repr(u8)]
pub enum PhysicalSide {
Top = 0,
Right,
Bottom,
Left,
}
impl PhysicalSide {
fn orthogonal_to(self, other: Self) -> bool {
matches!(self, Self::Top | Self::Bottom) != matches!(other, Self::Top | Self::Bottom)
}
}
#[derive(Clone, Copy, Debug, PartialEq)]
#[repr(u8)]
pub enum PhysicalCorner {
TopLeft = 0,
TopRight,
BottomRight,
BottomLeft,
}
impl PhysicalCorner {
fn from_sides(a: PhysicalSide, b: PhysicalSide) -> Self {
debug_assert!(a.orthogonal_to(b), "Sides should be orthogonal");
// Only some of these are possible, since we expect only orthogonal values. If the two
// sides were to be parallel, we fall back to returning TopLeft.
const IMPOSSIBLE: PhysicalCorner = PhysicalCorner::TopLeft;
static SIDES_TO_CORNER: [[PhysicalCorner; 4]; 4] = [
[
IMPOSSIBLE,
PhysicalCorner::TopRight,
IMPOSSIBLE,
PhysicalCorner::TopLeft,
],
[
PhysicalCorner::TopRight,
IMPOSSIBLE,
PhysicalCorner::BottomRight,
IMPOSSIBLE,
],
[
IMPOSSIBLE,
PhysicalCorner::BottomRight,
IMPOSSIBLE,
PhysicalCorner::BottomLeft,
],
[
PhysicalCorner::TopLeft,
IMPOSSIBLE,
PhysicalCorner::BottomLeft,
IMPOSSIBLE,
],
];
SIDES_TO_CORNER[a as usize][b as usize]
}
}
[ Dauer der Verarbeitung: 0.8 Sekunden
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]
|
2026-04-02
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