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gecko-dev/layout/generic/WritingModes.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/. */
#ifndef WritingModes_h_
#define WritingModes_h_
#include "nsRect.h"
#include "nsStyleStruct.h"
// If WRITING_MODE_VERTICAL_ENABLED is defined, we will attempt to support
// the vertical writing-mode values; if it is not defined, then
// WritingMode.IsVertical() will be hard-coded to return false, allowing
// many conditional branches to be optimized away while we're in the process
// of transitioning layout to use writing-mode and logical directions, but
// not yet ready to ship vertical support.
/* #define WRITING_MODE_VERTICAL_ENABLED 1 */
// It is the caller's responsibility to operate on logical-coordinate objects
// with matched writing modes. Failure to do so will be a runtime bug; the
// compiler can't catch it, but in debug mode, we'll throw an assertion.
// NOTE that in non-debug builds, a writing mode mismatch error will NOT be
// detected, yet the results will be nonsense (and may lead to further layout
// failures). Therefore, it is important to test (and fuzz-test) writing-mode
// support using debug builds.
// Methods in logical-coordinate classes that take another logical-coordinate
// object as a parameter should call CHECK_WRITING_MODE on it to verify that
// the writing modes match.
// (In some cases, there are internal (private) methods that don't do this;
// such methods should only be used by other methods that have already checked
// the writing modes.)
#define CHECK_WRITING_MODE(param) \
NS_ASSERTION(param == mWritingMode, "writing-mode mismatch")
/**
* mozilla::WritingMode is an immutable class representing a
* writing mode.
*
* It efficiently stores the writing mode and can rapidly compute
* interesting things about it for use in layout.
*
* Writing modes are computed from the CSS 'direction',
* 'writing-mode', and 'text-orientation' properties.
* See CSS3 Writing Modes for more information
* http://www.w3.org/TR/css3-writing-modes/
*/
namespace mozilla {
class WritingMode {
public:
/**
* Absolute inline flow direction
*/
enum InlineDir {
eInlineLTR = 0x00, // text flows horizontally left to right
eInlineRTL = 0x02, // text flows horizontally right to left
eInlineTTB = 0x01, // text flows vertically top to bottom
eInlineBTT = 0x03, // text flows vertically bottom to top
};
/**
* Absolute block flow direction
*/
enum BlockDir {
eBlockTB = 0x00, // horizontal lines stack top to bottom
eBlockRL = 0x01, // vertical lines stack right to left
eBlockLR = 0x05, // vertical lines stack left to right
};
/**
* Line-relative (bidi-relative) inline flow direction
*/
enum BidiDir {
eBidiLTR = 0x00, // inline flow matches bidi LTR text
eBidiRTL = 0x10, // inline flow matches bidi RTL text
};
/**
* Unknown writing mode (should never actually be stored or used anywhere).
*/
enum {
eUnknownWritingMode = 0xff
};
/**
* Return the absolute inline flow direction as an InlineDir
*/
InlineDir GetInlineDir() const { return InlineDir(mWritingMode & eInlineMask); }
/**
* Return the absolute block flow direction as a BlockDir
*/
BlockDir GetBlockDir() const { return BlockDir(mWritingMode & eBlockMask); }
/**
* Return the line-relative inline flow direction as a BidiDir
*/
BidiDir GetBidiDir() const { return BidiDir(mWritingMode & eBidiMask); }
/**
* Return true if LTR. (Convenience method)
*/
bool IsBidiLTR() const { return eBidiLTR == (mWritingMode & eBidiMask); }
/**
* True if vertical-mode block direction is LR (convenience method).
*/
bool IsVerticalLR() const { return eBlockLR == (mWritingMode & eBlockMask); }
/**
* True if vertical writing mode, i.e. when
* writing-mode: vertical-lr | vertical-rl.
*/
#ifdef WRITING_MODE_VERTICAL_ENABLED
bool IsVertical() const { return !!(mWritingMode & eOrientationMask); }
#else
bool IsVertical() const { return false; }
#endif
/**
* True if line-over/line-under are inverted from block-start/block-end.
* This is true when
* - writing-mode is vertical-rl && text-orientation is sideways-left
* - writing-mode is vertical-lr && text-orientation is not sideways-left
*/
#ifdef WRITING_MODE_VERTICAL_ENABLED
bool IsLineInverted() const { return !!(mWritingMode & eLineOrientMask); }
#else
bool IsLineInverted() const { return false; }
#endif
/**
* Block-axis flow-relative to line-relative factor.
* May be used as a multiplication factor for block-axis coordinates
* to convert between flow- and line-relative coordinate systems (e.g.
* positioning an over- or under-line decoration).
*/
int FlowRelativeToLineRelativeFactor() const
{
return IsLineInverted() ? -1 : 1;
}
/**
* Default constructor gives us a horizontal, LTR writing mode.
* XXX We will probably eliminate this and require explicit initialization
* in all cases once transition is complete.
*/
WritingMode()
: mWritingMode(0)
{ }
/**
* Construct writing mode based on a style context
*/
WritingMode(const nsStyleVisibility* aStyleVisibility)
{
NS_ASSERTION(aStyleVisibility, "we need an nsStyleVisibility here");
#ifdef WRITING_MODE_VERTICAL_ENABLED
switch (aStyleVisibility->mWritingMode) {
case NS_STYLE_WRITING_MODE_HORIZONTAL_TB:
mWritingMode = 0;
break;
case NS_STYLE_WRITING_MODE_VERTICAL_LR:
mWritingMode = eBlockFlowMask |
eLineOrientMask | //XXX needs update when text-orientation added
eOrientationMask;
break;
case NS_STYLE_WRITING_MODE_VERTICAL_RL:
mWritingMode = eOrientationMask;
break;
default:
NS_NOTREACHED("unknown writing mode!");
mWritingMode = 0;
break;
}
#else
mWritingMode = 0;
#endif
if (NS_STYLE_DIRECTION_RTL == aStyleVisibility->mDirection) {
mWritingMode |= eInlineFlowMask | //XXX needs update when text-orientation added
eBidiMask;
}
}
// For unicode-bidi: plaintext, reset the direction of the writing mode from
// the bidi paragraph level of the content
//XXX change uint8_t to UBiDiLevel after bug 924851
void SetDirectionFromBidiLevel(uint8_t level)
{
if (level & 1) {
// odd level, set RTL
mWritingMode |= eBidiMask;
} else {
// even level, set LTR
mWritingMode &= ~eBidiMask;
}
}
/**
* Compare two WritingModes for equality.
*/
bool operator==(const WritingMode& aOther) const
{
return mWritingMode == aOther.mWritingMode;
}
private:
friend class LogicalPoint;
friend class LogicalSize;
friend class LogicalMargin;
friend class LogicalRect;
/**
* Return a WritingMode representing an unknown value.
*/
static inline WritingMode Unknown()
{
return WritingMode(eUnknownWritingMode);
}
/**
* Constructing a WritingMode with an arbitrary value is a private operation
* currently only used by the Unknown() static method.
*/
WritingMode(uint8_t aValue)
: mWritingMode(aValue)
{ }
uint8_t mWritingMode;
enum Masks {
// Masks for our bits; true chosen as opposite of commonest case
eOrientationMask = 0x01, // true means vertical text
eInlineFlowMask = 0x02, // true means absolute RTL/BTT (against physical coords)
eBlockFlowMask = 0x04, // true means vertical-LR (or horizontal-BT if added)
eLineOrientMask = 0x08, // true means over != block-start
eBidiMask = 0x10, // true means line-relative RTL (bidi RTL)
// Note: We have one excess bit of info; WritingMode can pack into 4 bits.
// But since we have space, we're caching interesting things for fast access.
// Masks for output enums
eInlineMask = 0x03,
eBlockMask = 0x05
};
};
/**
* Logical-coordinate classes:
*
* There are three sets of coordinate space:
* - physical (top, left, bottom, right)
* relative to graphics coord system
* - flow-relative (block-start, inline-start, block-end, inline-end)
* relative to block/inline flow directions
* - line-relative (line-over, line-left, line-under, line-right)
* relative to glyph orientation / inline bidi directions
* See CSS3 Writing Modes for more information
* http://www.w3.org/TR/css3-writing-modes/#abstract-box
*
* For shorthand, B represents the block-axis
* I represents the inline-axis
*
* The flow-relative geometric classes store coords in flow-relative space.
* They use a private ns{Point,Size,Rect,Margin} member to store the actual
* coordinate values, but reinterpret them as logical instead of physical.
* This allows us to easily perform calculations in logical space (provided
* writing modes of the operands match), by simply mapping to nsPoint (etc)
* methods.
*
* Physical-coordinate accessors/setters are responsible to translate these
* internal logical values as necessary.
*
* In DEBUG builds, the logical types store their WritingMode and check
* that the same WritingMode is passed whenever callers ask them to do a
* writing-mode-dependent operation. Non-DEBUG builds do NOT check this,
* to avoid the overhead of storing WritingMode fields.
*
* Open question: do we need a different set optimized for line-relative
* math, for use in nsLineLayout and the like? Or is multiplying values
* by FlowRelativeToLineRelativeFactor() enough?
*/
/**
* Flow-relative point
*/
class LogicalPoint {
public:
LogicalPoint(WritingMode aWritingMode)
:
#ifdef DEBUG
mWritingMode(aWritingMode),
#endif
mPoint(0, 0)
{ }
// Construct from a writing mode and individual coordinates (which MUST be
// values in that writing mode, NOT physical coordinates!)
LogicalPoint(WritingMode aWritingMode, nscoord aI, nscoord aB)
:
#ifdef DEBUG
mWritingMode(aWritingMode),
#endif
mPoint(aI, aB)
{ }
// Construct from a writing mode and a physical point, within a given
// containing rectangle's width (defining the conversion between LTR
// and RTL coordinates).
LogicalPoint(WritingMode aWritingMode,
const nsPoint& aPoint,
nscoord aContainerWidth)
#ifdef DEBUG
: mWritingMode(aWritingMode)
#endif
{
if (aWritingMode.IsVertical()) {
I() = aPoint.y;
B() = aWritingMode.IsVerticalLR() ? aPoint.x : aContainerWidth - aPoint.x;
} else {
I() = aWritingMode.IsBidiLTR() ? aPoint.x : aContainerWidth - aPoint.x;
B() = aPoint.y;
}
}
/**
* Read-only (const) access to the coordinates, in both logical
* and physical terms.
*/
nscoord I(WritingMode aWritingMode) const // inline-axis
{
CHECK_WRITING_MODE(aWritingMode);
return mPoint.x;
}
nscoord B(WritingMode aWritingMode) const // block-axis
{
CHECK_WRITING_MODE(aWritingMode);
return mPoint.y;
}
nscoord X(WritingMode aWritingMode, nscoord aContainerWidth) const
{
CHECK_WRITING_MODE(aWritingMode);
if (aWritingMode.IsVertical()) {
return aWritingMode.IsVerticalLR() ? B() : aContainerWidth - B();
} else {
return aWritingMode.IsBidiLTR() ? I() : aContainerWidth - I();
}
}
nscoord Y(WritingMode aWritingMode) const
{
CHECK_WRITING_MODE(aWritingMode);
return aWritingMode.IsVertical() ? I() : B();
}
/**
* These non-const accessors return a reference (lvalue) that can be
* assigned to by callers.
*/
nscoord& I(WritingMode aWritingMode) // inline-axis
{
CHECK_WRITING_MODE(aWritingMode);
return mPoint.x;
}
nscoord& B(WritingMode aWritingMode) // block-axis
{
CHECK_WRITING_MODE(aWritingMode);
return mPoint.y;
}
/**
* Setters for the physical coordinates.
*/
void SetX(WritingMode aWritingMode, nscoord aX, nscoord aContainerWidth)
{
CHECK_WRITING_MODE(aWritingMode);
if (aWritingMode.IsVertical()) {
B() = aWritingMode.IsVerticalLR() ? aX : aContainerWidth - aX;
} else {
I() = aWritingMode.IsBidiLTR() ? aX : aContainerWidth - aX;
}
}
void SetY(WritingMode aWritingMode, nscoord aY)
{
CHECK_WRITING_MODE(aWritingMode);
if (aWritingMode.IsVertical()) {
B() = aY;
} else {
I() = aY;
}
}
/**
* Return a physical point corresponding to our logical coordinates,
* converted according to our writing mode.
*/
nsPoint GetPhysicalPoint(WritingMode aWritingMode,
nscoord aContainerWidth) const
{
CHECK_WRITING_MODE(aWritingMode);
if (aWritingMode.IsVertical()) {
return nsPoint(aWritingMode.IsVerticalLR() ? B() : aContainerWidth - B(),
I());
} else {
return nsPoint(aWritingMode.IsBidiLTR() ? I() : aContainerWidth - I(),
B());
}
}
/**
* Return the equivalent point in a different writing mode.
*/
LogicalPoint ConvertTo(WritingMode aToMode, WritingMode aFromMode,
nscoord aContainerWidth) const
{
CHECK_WRITING_MODE(aFromMode);
return aToMode == aFromMode ?
*this : LogicalPoint(aToMode,
GetPhysicalPoint(aFromMode, aContainerWidth),
aContainerWidth);
}
LogicalPoint operator+(const LogicalPoint& aOther) const
{
CHECK_WRITING_MODE(aOther.GetWritingMode());
// In non-debug builds, LogicalPoint does not store the WritingMode,
// so the first parameter here (which will always be eUnknownWritingMode)
// is ignored.
return LogicalPoint(GetWritingMode(),
mPoint.x + aOther.mPoint.x,
mPoint.y + aOther.mPoint.y);
}
private:
friend class LogicalRect;
/**
* NOTE that in non-DEBUG builds, GetWritingMode() always returns
* eUnknownWritingMode, as the current mode is not stored in the logical-
* geometry classes. Therefore, this method is private; it is used ONLY
* by the DEBUG-mode checking macros in this class and its friends;
* other code is not allowed to ask a logical point for its writing mode,
* as this info will simply not be available in non-DEBUG builds.
*
* Also, in non-DEBUG builds, CHECK_WRITING_MODE does nothing, and the
* WritingMode parameter to logical methods will generally be optimized
* away altogether.
*/
#ifdef DEBUG
WritingMode GetWritingMode() const { return mWritingMode; }
#else
WritingMode GetWritingMode() const { return WritingMode::Unknown(); }
#endif
// We don't allow construction of a LogicalPoint with no writing mode.
LogicalPoint() MOZ_DELETE;
// Accessors that don't take or check a WritingMode value.
// These are for internal use only; they are called by methods that have
// themselves already checked the WritingMode passed by the caller.
nscoord I() const // inline-axis
{
return mPoint.x;
}
nscoord B() const // block-axis
{
return mPoint.y;
}
nscoord& I() // inline-axis
{
return mPoint.x;
}
nscoord& B() // block-axis
{
return mPoint.y;
}
WritingMode mWritingMode;
// We use an nsPoint to hold the coordinates, but reinterpret its .x and .y
// fields as the inline and block directions. Hence, this is not exposed
// directly, but only through accessors that will map them according to the
// writing mode.
nsPoint mPoint;
};
/**
* Flow-relative size
*/
class LogicalSize {
public:
LogicalSize(WritingMode aWritingMode)
:
#ifdef DEBUG
mWritingMode(aWritingMode),
#endif
mSize(0, 0)
{ }
LogicalSize(WritingMode aWritingMode, nscoord aISize, nscoord aBSize)
:
#ifdef DEBUG
mWritingMode(aWritingMode),
#endif
mSize(aISize, aBSize)
{ }
LogicalSize(WritingMode aWritingMode, const nsSize& aPhysicalSize)
#ifdef DEBUG
: mWritingMode(aWritingMode)
#endif
{
if (aWritingMode.IsVertical()) {
ISize() = aPhysicalSize.height;
BSize() = aPhysicalSize.width;
} else {
ISize() = aPhysicalSize.width;
BSize() = aPhysicalSize.height;
}
}
/**
* Dimensions in logical and physical terms
*/
nscoord ISize(WritingMode aWritingMode) const // inline-size
{
CHECK_WRITING_MODE(aWritingMode);
return mSize.width;
}
nscoord BSize(WritingMode aWritingMode) const // block-size
{
CHECK_WRITING_MODE(aWritingMode);
return mSize.height;
}
nscoord Width(WritingMode aWritingMode) const
{
CHECK_WRITING_MODE(aWritingMode);
return aWritingMode.IsVertical() ? BSize() : ISize();
}
nscoord Height(WritingMode aWritingMode) const
{
CHECK_WRITING_MODE(aWritingMode);
return aWritingMode.IsVertical() ? ISize() : BSize();
}
/**
* Writable references to the logical dimensions
*/
nscoord& ISize(WritingMode aWritingMode) // inline-size
{
CHECK_WRITING_MODE(aWritingMode);
return mSize.width;
}
nscoord& BSize(WritingMode aWritingMode) // block-size
{
CHECK_WRITING_MODE(aWritingMode);
return mSize.height;
}
/**
* Setters for the physical dimensions
*/
void SetWidth(WritingMode aWritingMode, nscoord aWidth)
{
CHECK_WRITING_MODE(aWritingMode);
if (aWritingMode.IsVertical()) {
BSize() = aWidth;
} else {
ISize() = aWidth;
}
}
void SetHeight(WritingMode aWritingMode, nscoord aHeight)
{
CHECK_WRITING_MODE(aWritingMode);
if (aWritingMode.IsVertical()) {
ISize() = aHeight;
} else {
BSize() = aHeight;
}
}
/**
* Return an nsSize containing our physical dimensions
*/
nsSize GetPhysicalSize(WritingMode aWritingMode) const
{
CHECK_WRITING_MODE(aWritingMode);
return aWritingMode.IsVertical() ?
nsSize(BSize(), ISize()) : nsSize(ISize(), BSize());
}
/**
* Return a LogicalSize representing this size in a different writing mode
*/
LogicalSize ConvertTo(WritingMode aToMode, WritingMode aFromMode) const
{
CHECK_WRITING_MODE(aFromMode);
return aToMode == aFromMode ?
*this : LogicalSize(aToMode, GetPhysicalSize(aFromMode));
}
private:
friend class LogicalRect;
LogicalSize() MOZ_DELETE;
#ifdef DEBUG
WritingMode GetWritingMode() const { return mWritingMode; }
#else
WritingMode GetWritingMode() const { return WritingMode::Unknown(); }
#endif
nscoord ISize() const // inline-size
{
return mSize.width;
}
nscoord BSize() const // block-size
{
return mSize.height;
}
nscoord& ISize() // inline-size
{
return mSize.width;
}
nscoord& BSize() // block-size
{
return mSize.height;
}
WritingMode mWritingMode;
nsSize mSize;
};
/**
* Flow-relative margin
*/
class LogicalMargin {
public:
LogicalMargin(WritingMode aWritingMode)
:
#ifdef DEBUG
mWritingMode(aWritingMode),
#endif
mMargin(0, 0, 0, 0)
{ }
LogicalMargin(WritingMode aWritingMode,
nscoord aBStart, nscoord aIEnd,
nscoord aBEnd, nscoord aIStart)
:
#ifdef DEBUG
mWritingMode(aWritingMode),
#endif
mMargin(aBStart, aIEnd, aBEnd, aIStart)
{ }
LogicalMargin(WritingMode aWritingMode, const nsMargin& aPhysicalMargin)
#ifdef DEBUG
: mWritingMode(aWritingMode)
#endif
{
if (aWritingMode.IsVertical()) {
if (aWritingMode.IsVerticalLR()) {
mMargin.top = aPhysicalMargin.left;
mMargin.bottom = aPhysicalMargin.right;
} else {
mMargin.top = aPhysicalMargin.right;
mMargin.bottom = aPhysicalMargin.left;
}
if (aWritingMode.IsBidiLTR()) {
mMargin.left = aPhysicalMargin.top;
mMargin.right = aPhysicalMargin.bottom;
} else {
mMargin.left = aPhysicalMargin.bottom;
mMargin.right = aPhysicalMargin.top;
}
} else {
mMargin.top = aPhysicalMargin.top;
mMargin.bottom = aPhysicalMargin.bottom;
if (aWritingMode.IsBidiLTR()) {
mMargin.left = aPhysicalMargin.left;
mMargin.right = aPhysicalMargin.right;
} else {
mMargin.left = aPhysicalMargin.right;
mMargin.right = aPhysicalMargin.left;
}
}
}
nscoord IStart(WritingMode aWritingMode) const // inline-start margin
{
CHECK_WRITING_MODE(aWritingMode);
return mMargin.left;
}
nscoord IEnd(WritingMode aWritingMode) const // inline-end margin
{
CHECK_WRITING_MODE(aWritingMode);
return mMargin.right;
}
nscoord BStart(WritingMode aWritingMode) const // block-start margin
{
CHECK_WRITING_MODE(aWritingMode);
return mMargin.top;
}
nscoord BEnd(WritingMode aWritingMode) const // block-end margin
{
CHECK_WRITING_MODE(aWritingMode);
return mMargin.bottom;
}
nscoord& IStart(WritingMode aWritingMode) // inline-start margin
{
CHECK_WRITING_MODE(aWritingMode);
return mMargin.left;
}
nscoord& IEnd(WritingMode aWritingMode) // inline-end margin
{
CHECK_WRITING_MODE(aWritingMode);
return mMargin.right;
}
nscoord& BStart(WritingMode aWritingMode) // block-start margin
{
CHECK_WRITING_MODE(aWritingMode);
return mMargin.top;
}
nscoord& BEnd(WritingMode aWritingMode) // block-end margin
{
CHECK_WRITING_MODE(aWritingMode);
return mMargin.bottom;
}
nscoord IStartEnd(WritingMode aWritingMode) const // inline margins
{
CHECK_WRITING_MODE(aWritingMode);
return mMargin.LeftRight();
}
nscoord BStartEnd(WritingMode aWritingMode) const // block margins
{
CHECK_WRITING_MODE(aWritingMode);
return mMargin.TopBottom();
}
/**
* Accessors for physical margins, using our writing mode to convert from
* logical values.
*/
nscoord Top(WritingMode aWritingMode) const
{
CHECK_WRITING_MODE(aWritingMode);
return aWritingMode.IsVertical() ?
(aWritingMode.IsBidiLTR() ? IStart() : IEnd()) : BStart();
}
nscoord Bottom(WritingMode aWritingMode) const
{
CHECK_WRITING_MODE(aWritingMode);
return aWritingMode.IsVertical() ?
(aWritingMode.IsBidiLTR() ? IEnd() : IStart()) : BEnd();
}
nscoord Left(WritingMode aWritingMode) const
{
CHECK_WRITING_MODE(aWritingMode);
return aWritingMode.IsVertical() ?
(aWritingMode.IsVerticalLR() ? BStart() : BEnd()) :
(aWritingMode.IsBidiLTR() ? IStart() : IEnd());
}
nscoord Right(WritingMode aWritingMode) const
{
CHECK_WRITING_MODE(aWritingMode);
return aWritingMode.IsVertical() ?
(aWritingMode.IsVerticalLR() ? BEnd() : BStart()) :
(aWritingMode.IsBidiLTR() ? IEnd() : IStart());
}
nscoord LeftRight(WritingMode aWritingMode) const
{
CHECK_WRITING_MODE(aWritingMode);
return aWritingMode.IsVertical() ? BStartEnd() : IStartEnd();
}
nscoord TopBottom(WritingMode aWritingMode) const
{
CHECK_WRITING_MODE(aWritingMode);
return aWritingMode.IsVertical() ? IStartEnd() : BStartEnd();
}
void SizeTo(WritingMode aWritingMode,
nscoord aBStart, nscoord aIEnd, nscoord aBEnd, nscoord aIStart)
{
CHECK_WRITING_MODE(aWritingMode);
mMargin.SizeTo(aBStart, aIEnd, aBEnd, aIStart);
}
/**
* Return an nsMargin containing our physical coordinates
*/
nsMargin GetPhysicalMargin(WritingMode aWritingMode) const
{
CHECK_WRITING_MODE(aWritingMode);
return aWritingMode.IsVertical() ?
(aWritingMode.IsVerticalLR() ?
nsMargin(IStart(), BEnd(), IEnd(), BStart()) :
nsMargin(IStart(), BStart(), IEnd(), BEnd())) :
(aWritingMode.IsBidiLTR() ?
nsMargin(BStart(), IEnd(), BEnd(), IStart()) :
nsMargin(BStart(), IStart(), BEnd(), IEnd()));
}
/**
* Return a LogicalMargin representing this margin in a different
* writing mode
*/
LogicalMargin ConvertTo(WritingMode aToMode, WritingMode aFromMode) const
{
CHECK_WRITING_MODE(aFromMode);
return aToMode == aFromMode ?
*this : LogicalMargin(aToMode, GetPhysicalMargin(aFromMode));
}
bool IsEmpty() const
{
return (mMargin.left == 0 && mMargin.top == 0 &&
mMargin.right == 0 && mMargin.bottom == 0);
}
private:
friend class LogicalRect;
LogicalMargin() MOZ_DELETE;
#ifdef DEBUG
WritingMode GetWritingMode() const { return mWritingMode; }
#else
WritingMode GetWritingMode() const { return WritingMode::Unknown(); }
#endif
nscoord IStart() const // inline-start margin
{
return mMargin.left;
}
nscoord IEnd() const // inline-end margin
{
return mMargin.right;
}
nscoord BStart() const // block-start margin
{
return mMargin.top;
}
nscoord BEnd() const // block-end margin
{
return mMargin.bottom;
}
nscoord& IStart() // inline-start margin
{
return mMargin.left;
}
nscoord& IEnd() // inline-end margin
{
return mMargin.right;
}
nscoord& BStart() // block-start margin
{
return mMargin.top;
}
nscoord& BEnd() // block-end margin
{
return mMargin.bottom;
}
nscoord IStartEnd() const // inline margins
{
return mMargin.LeftRight();
}
nscoord BStartEnd() const // block margins
{
return mMargin.TopBottom();
}
WritingMode mWritingMode;
nsMargin mMargin;
};
/**
* Flow-relative rectangle
*/
class LogicalRect {
public:
LogicalRect(WritingMode aWritingMode)
:
#ifdef DEBUG
mWritingMode(aWritingMode),
#endif
mRect(0, 0, 0, 0)
{ }
LogicalRect(WritingMode aWritingMode,
nscoord aIStart, nscoord aBStart,
nscoord aISize, nscoord aBSize)
:
#ifdef DEBUG
mWritingMode(aWritingMode),
#endif
mRect(aIStart, aBStart, aISize, aBSize)
{ }
LogicalRect(WritingMode aWritingMode,
const LogicalPoint& aOrigin,
const LogicalSize& aSize)
:
#ifdef DEBUG
mWritingMode(aWritingMode),
#endif
mRect(aOrigin.mPoint, aSize.mSize)
{
CHECK_WRITING_MODE(aOrigin.GetWritingMode());
CHECK_WRITING_MODE(aSize.GetWritingMode());
}
LogicalRect(WritingMode aWritingMode,
const nsRect& aRect,
nscoord aContainerWidth)
#ifdef DEBUG
: mWritingMode(aWritingMode)
#endif
{
if (aWritingMode.IsVertical()) {
if (aWritingMode.IsVerticalLR()) {
mRect.y = aRect.x;
} else {
mRect.y = aContainerWidth - aRect.XMost();
}
mRect.height = aRect.width;
mRect.x = aRect.y;
mRect.width = aRect.height;
} else {
if (aWritingMode.IsBidiLTR()) {
mRect.x = aRect.x;
} else {
mRect.x = aContainerWidth - aRect.XMost();
}
mRect.width = aRect.width;
mRect.y = aRect.y;
mRect.height = aRect.height;
}
}
/**
* Inline- and block-dimension geometry.
*/
nscoord IStart(WritingMode aWritingMode) const // inline-start edge
{
CHECK_WRITING_MODE(aWritingMode);
return mRect.X();
}
nscoord IEnd(WritingMode aWritingMode) const // inline-end edge
{
CHECK_WRITING_MODE(aWritingMode);
return mRect.XMost();
}
nscoord ISize(WritingMode aWritingMode) const // inline-size
{
CHECK_WRITING_MODE(aWritingMode);
return mRect.Width();
}
nscoord BStart(WritingMode aWritingMode) const // block-start edge
{
CHECK_WRITING_MODE(aWritingMode);
return mRect.Y();
}
nscoord BEnd(WritingMode aWritingMode) const // block-end edge
{
CHECK_WRITING_MODE(aWritingMode);
return mRect.YMost();
}
nscoord BSize(WritingMode aWritingMode) const // block-size
{
CHECK_WRITING_MODE(aWritingMode);
return mRect.Height();
}
/**
* Writable (reference) accessors are only available for the basic logical
* fields (Start and Size), not derivatives like End.
*/
nscoord& IStart(WritingMode aWritingMode) // inline-start edge
{
CHECK_WRITING_MODE(aWritingMode);
return mRect.x;
}
nscoord& ISize(WritingMode aWritingMode) // inline-size
{
CHECK_WRITING_MODE(aWritingMode);
return mRect.width;
}
nscoord& BStart(WritingMode aWritingMode) // block-start edge
{
CHECK_WRITING_MODE(aWritingMode);
return mRect.y;
}
nscoord& BSize(WritingMode aWritingMode) // block-size
{
CHECK_WRITING_MODE(aWritingMode);
return mRect.height;
}
/**
* Physical coordinates of the rect.
*/
nscoord X(WritingMode aWritingMode, nscoord aContainerWidth) const
{
CHECK_WRITING_MODE(aWritingMode);
if (aWritingMode.IsVertical()) {
return aWritingMode.IsVerticalLR() ?
mRect.Y() : aContainerWidth - mRect.YMost();
} else {
return aWritingMode.IsBidiLTR() ?
mRect.X() : aContainerWidth - mRect.XMost();
}
}
void SetX(WritingMode aWritingMode, nscoord aX, nscoord aContainerWidth)
{
CHECK_WRITING_MODE(aWritingMode);
if (aWritingMode.IsVertical()) {
if (aWritingMode.IsVerticalLR()) {
BStart() = aX;
} else {
BStart() = aContainerWidth - aX - BSize();
}
} else {
if (aWritingMode.IsBidiLTR()) {
IStart() = aX;
} else {
IStart() = aContainerWidth - aX - ISize();
}
}
}
nscoord Y(WritingMode aWritingMode) const
{
CHECK_WRITING_MODE(aWritingMode);
return aWritingMode.IsVertical() ? mRect.X() : mRect.Y();
}
void SetY(WritingMode aWritingMode, nscoord aY)
{
CHECK_WRITING_MODE(aWritingMode);
if (aWritingMode.IsVertical()) {
IStart() = aY;
} else {
BStart() = aY;
}
}
nscoord Width(WritingMode aWritingMode) const
{
CHECK_WRITING_MODE(aWritingMode);
return aWritingMode.IsVertical() ? mRect.Height() : mRect.Width();
}
// When setting the Width of a rect, we keep its physical X-coord fixed
// and modify XMax. This means that in the RTL case, we'll be moving
// the IStart, so that IEnd remains constant.
void SetWidth(WritingMode aWritingMode, nscoord aWidth)
{
CHECK_WRITING_MODE(aWritingMode);
if (aWritingMode.IsVertical()) {
if (!aWritingMode.IsVerticalLR()) {
BStart() = BStart() + BSize() - aWidth;
}
BSize() = aWidth;
} else {
if (!aWritingMode.IsBidiLTR()) {
IStart() = IStart() + ISize() - aWidth;
}
ISize() = aWidth;
}
}
nscoord Height(WritingMode aWritingMode) const
{
CHECK_WRITING_MODE(aWritingMode);
return aWritingMode.IsVertical() ? mRect.Width() : mRect.Height();
}
void SetHeight(WritingMode aWritingMode, nscoord aHeight)
{
CHECK_WRITING_MODE(aWritingMode);
if (aWritingMode.IsVertical()) {
ISize() = aHeight;
} else {
BSize() = aHeight;
}
}
nscoord XMost(WritingMode aWritingMode, nscoord aContainerWidth) const
{
CHECK_WRITING_MODE(aWritingMode);
if (aWritingMode.IsVertical()) {
return aWritingMode.IsVerticalLR() ?
mRect.YMost() : aContainerWidth - mRect.Y();
} else {
return aWritingMode.IsBidiLTR() ?
mRect.XMost() : aContainerWidth - mRect.X();
}
}
nscoord YMost(WritingMode aWritingMode) const
{
CHECK_WRITING_MODE(aWritingMode);
return aWritingMode.IsVertical() ? mRect.XMost() : mRect.YMost();
}
bool IsEmpty() const
{
return (mRect.x == 0 && mRect.y == 0 &&
mRect.width == 0 && mRect.height == 0);
}
bool IsZeroSize() const
{
return (mRect.width == 0 && mRect.height == 0);
}
/* XXX are these correct?
nscoord ILeft(WritingMode aWritingMode) const
{
CHECK_WRITING_MODE(aWritingMode);
return aWritingMode.IsBidiLTR() ? IStart() : IEnd();
}
nscoord IRight(WritingMode aWritingMode) const
{
CHECK_WRITING_MODE(aWritingMode);
return aWritingMode.IsBidiLTR() ? IEnd() : IStart();
}
*/
LogicalPoint Origin(WritingMode aWritingMode) const
{
CHECK_WRITING_MODE(aWritingMode);
return LogicalPoint(aWritingMode, IStart(), BStart());
}
LogicalSize Size(WritingMode aWritingMode) const
{
CHECK_WRITING_MODE(aWritingMode);
return LogicalSize(aWritingMode, ISize(), BSize());
}
LogicalRect operator+(const LogicalPoint& aPoint) const
{
CHECK_WRITING_MODE(aPoint.GetWritingMode());
return LogicalRect(GetWritingMode(),
IStart() + aPoint.I(), BStart() + aPoint.B(),
ISize(), BSize());
}
LogicalRect& operator+=(const LogicalPoint& aPoint)
{
CHECK_WRITING_MODE(aPoint.GetWritingMode());
mRect += aPoint.mPoint;
return *this;
}
LogicalRect operator-(const LogicalPoint& aPoint) const
{
CHECK_WRITING_MODE(aPoint.GetWritingMode());
return LogicalRect(GetWritingMode(),
IStart() - aPoint.I(), BStart() - aPoint.B(),
ISize(), BSize());
}
LogicalRect& operator-=(const LogicalPoint& aPoint)
{
CHECK_WRITING_MODE(aPoint.GetWritingMode());
mRect -= aPoint.mPoint;
return *this;
}
void MoveBy(WritingMode aWritingMode, const LogicalPoint& aDelta)
{
CHECK_WRITING_MODE(aWritingMode);
CHECK_WRITING_MODE(aDelta.GetWritingMode());
IStart() += aDelta.I();
BStart() += aDelta.B();
}
void Inflate(nscoord aD) { mRect.Inflate(aD); }
void Inflate(nscoord aDI, nscoord aDB) { mRect.Inflate(aDI, aDB); }
void Inflate(WritingMode aWritingMode, const LogicalMargin& aMargin)
{
CHECK_WRITING_MODE(aWritingMode);
CHECK_WRITING_MODE(aMargin.GetWritingMode());
mRect.Inflate(aMargin.mMargin);
}
void Deflate(nscoord aD) { mRect.Deflate(aD); }
void Deflate(nscoord aDI, nscoord aDB) { mRect.Deflate(aDI, aDB); }
void Deflate(WritingMode aWritingMode, const LogicalMargin& aMargin)
{
CHECK_WRITING_MODE(aWritingMode);
CHECK_WRITING_MODE(aMargin.GetWritingMode());
mRect.Deflate(aMargin.mMargin);
}
/**
* Return an nsRect containing our physical coordinates within the given
* container width
*/
nsRect GetPhysicalRect(WritingMode aWritingMode,
nscoord aContainerWidth) const
{
CHECK_WRITING_MODE(aWritingMode);
if (aWritingMode.IsVertical()) {
return nsRect(aWritingMode.IsVerticalLR() ?
BStart() : aContainerWidth - BEnd(),
IStart(), BSize(), ISize());
} else {
return nsRect(aWritingMode.IsBidiLTR() ?
IStart() : aContainerWidth - IEnd(),
BStart(), ISize(), BSize());
}
}
#if 0 // XXX this would require aContainerWidth as well
/**
* Return a LogicalRect representing this rect in a different writing mode
*/
LogicalRect ConvertTo(WritingMode aToMode, WritingMode aFromMode) const
{
CHECK_WRITING_MODE(aFromMode);
return aToMode == aFromMode ?
*this : LogicalRect(aToMode, GetPhysicalRect(aFromMode));
}
#endif
private:
LogicalRect() MOZ_DELETE;
#ifdef DEBUG
WritingMode GetWritingMode() const { return mWritingMode; }
#else
WritingMode GetWritingMode() const { return WritingMode::Unknown(); }
#endif
nscoord IStart() const // inline-start edge
{
return mRect.X();
}
nscoord IEnd() const // inline-end edge
{
return mRect.XMost();
}
nscoord ISize() const // inline-size
{
return mRect.Width();
}
nscoord BStart() const // block-start edge
{
return mRect.Y();
}
nscoord BEnd() const // block-end edge
{
return mRect.YMost();
}
nscoord BSize() const // block-size
{
return mRect.Height();
}
nscoord& IStart() // inline-start edge
{
return mRect.x;
}
nscoord& ISize() // inline-size
{
return mRect.width;
}
nscoord& BStart() // block-start edge
{
return mRect.y;
}
nscoord& BSize() // block-size
{
return mRect.height;
}
WritingMode mWritingMode;
nsRect mRect;
};
} // namespace mozilla
#endif // WritingModes_h_
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