Move util::logical_geometry to style

1 files changed, 0 insertions, 1040 deletions

diff --git a/components/util/logical_geometry.rs b/components/util/logical_geometry.rs
deleted file mode 100644
index 661ef0c6a65..00000000000
--- a/components/util/logical_geometry.rs
+++ /dev/null
@@ -1,1040 +0,0 @@
-/* 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 http://mozilla.org/MPL/2.0/. */
-
-//! Geometry in flow-relative space.
-
-use euclid::num::Zero;
-use euclid::{Point2D, Rect, SideOffsets2D, Size2D};
-use std::cmp::{max, min};
-use std::fmt::{self, Debug, Error, Formatter};
-use std::ops::{Add, Sub};
-
-bitflags!(
-    #[derive(HeapSizeOf, RustcEncodable)]
-    flags WritingMode: u8 {
-        const FLAG_RTL = 1 << 0,
-        const FLAG_VERTICAL = 1 << 1,
-        const FLAG_VERTICAL_LR = 1 << 2,
-        const FLAG_SIDEWAYS_LEFT = 1 << 3
-    }
-);
-
-impl WritingMode {
-    #[inline]
-    pub fn is_vertical(&self) -> bool {
-        self.intersects(FLAG_VERTICAL)
-    }
-
-    /// Assuming .is_vertical(), does the block direction go left to right?
-    #[inline]
-    pub fn is_vertical_lr(&self) -> bool {
-        self.intersects(FLAG_VERTICAL_LR)
-    }
-
-    /// Assuming .is_vertical(), does the inline direction go top to bottom?
-    #[inline]
-    pub fn is_inline_tb(&self) -> bool {
-        !(self.intersects(FLAG_SIDEWAYS_LEFT) ^ self.intersects(FLAG_RTL))
-    }
-
-    #[inline]
-    pub fn is_bidi_ltr(&self) -> bool {
-        !self.intersects(FLAG_RTL)
-    }
-
-    #[inline]
-    pub fn is_sideways_left(&self) -> bool {
-        self.intersects(FLAG_SIDEWAYS_LEFT)
-    }
-
-    #[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]
-    /// The default bidirectional embedding level for this writing mode.
-    ///
-    /// Returns 0 if the mode is LTR, or 1 otherwise.
-    pub fn to_bidi_level(&self) -> u8 {
-        !self.is_bidi_ltr() as u8
-    }
-}
-
-impl fmt::Display for WritingMode {
-    fn fmt(&self, formatter: &mut Formatter) -> Result<(), Error> {
-        if self.is_vertical() {
-            try!(write!(formatter, "V"));
-            if self.is_vertical_lr() {
-                try!(write!(formatter, " LR"));
-            } else {
-                try!(write!(formatter, " RL"));
-            }
-            if self.intersects(FLAG_SIDEWAYS_LEFT) {
-                try!(write!(formatter, " SidewaysL"));
-            }
-        } else {
-            try!(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(RustcEncodable, PartialEq, Eq, Clone, Copy)]
-struct DebugWritingMode;
-
-#[cfg(debug_assertions)]
-#[derive(RustcEncodable, PartialEq, Eq, Clone, Copy)]
-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!(self.mode == other)
-    }
-
-    #[inline]
-    fn check_debug(&self, other: DebugWritingMode) {
-        assert!(self.mode == other.mode)
-    }
-
-    #[inline]
-    fn new(mode: WritingMode) -> DebugWritingMode {
-        DebugWritingMode { mode: 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)
-    }
-}
-
-
-/// A 2D size in flow-relative dimensions
-#[derive(RustcEncodable, PartialEq, Eq, Clone, Copy)]
-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: Copy> 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)
-        }
-    }
-
-    #[inline]
-    pub fn width(&self, mode: WritingMode) -> T {
-        self.debug_writing_mode.check(mode);
-        if mode.is_vertical() {
-            self.block
-        } else {
-            self.inline
-        }
-    }
-
-    #[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
-        } else {
-            self.block
-        }
-    }
-
-    #[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 { width: self.block, height: self.inline }
-        } else {
-            Size2D { width: self.inline, height: self.block }
-        }
-    }
-
-    #[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
-        } 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(PartialEq, RustcEncodable, Eq, Clone, Copy)]
-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 {
-                x: if mode.is_vertical_lr() { self.b } else { container_size.width - self.b },
-                y: if mode.is_inline_tb() { self.i } else { container_size.height - self.i }
-            }
-        } else {
-            Point2D {
-                x: if mode.is_bidi_ltr() { self.i } else { container_size.width - self.i },
-                y: 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(RustcEncodable, PartialEq, Eq, Clone, Copy)]
-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: Copy> 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: block_start,
-            inline_end: inline_end,
-            block_end: block_end,
-            inline_start: inline_start,
-            debug_writing_mode: DebugWritingMode::new(mode),
-        }
-    }
-
-    #[inline]
-    pub fn new_all_same(mode: WritingMode, value: T) -> LogicalMargin<T> {
-        LogicalMargin::new(mode, value, value, value, value)
-    }
-
-    #[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)
-    }
-
-    #[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 } else { self.inline_end }
-        } else {
-            self.block_start
-        }
-    }
-
-    #[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 } else { self.block_start }
-        } else {
-            if mode.is_bidi_ltr() { self.inline_end } else { self.inline_start }
-        }
-    }
-
-    #[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 } else { self.inline_start }
-        } else {
-            self.block_end
-        }
-    }
-
-    #[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 } else { self.block_end }
-        } else {
-            if mode.is_bidi_ltr() { self.inline_start } else { self.inline_end }
-        }
-    }
-
-    #[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;
-                right = self.block_end;
-            } else {
-                right = self.block_start;
-                left = self.block_end;
-            }
-            if mode.is_inline_tb() {
-                top = self.inline_start;
-                bottom = self.inline_end;
-            } else {
-                bottom = self.inline_start;
-                top = self.inline_end;
-            }
-        } else {
-            top = self.block_start;
-            bottom = self.block_end;
-            if mode.is_bidi_ltr() {
-                left = self.inline_start;
-                right = self.inline_end;
-            } else {
-                right = self.inline_start;
-                left = self.inline_end;
-            }
-        }
-        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
-        } 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 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(RustcEncodable, PartialEq, Eq, Clone, Copy)]
-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 { x: x, y: y },
-            size: Size2D { width: width, height: 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(Copy, Clone, PartialEq, Debug)]
-pub enum PhysicalSide {
-    Top,
-    Right,
-    Bottom,
-    Left,
-}