/* -*- 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") namespace mozilla { // Logical side constants for use in various places. enum LogicalSide { eLogicalSideBStart, eLogicalSideBEnd, eLogicalSideIStart, eLogicalSideIEnd }; enum LogicalSideBits { eLogicalSideBitsNone = 0, eLogicalSideBitsBStart = 1 << eLogicalSideBStart, eLogicalSideBitsBEnd = 1 << eLogicalSideBEnd, eLogicalSideBitsIEnd = 1 << eLogicalSideIEnd, eLogicalSideBitsIStart = 1 << eLogicalSideIStart, eLogicalSideBitsBBoth = eLogicalSideBitsBStart | eLogicalSideBitsBEnd, eLogicalSideBitsIBoth = eLogicalSideBitsIStart | eLogicalSideBitsIEnd, eLogicalSideBitsAll = eLogicalSideBitsBBoth | eLogicalSideBitsIBoth }; #define LOGICAL_SIDE_B_START mozilla::eLogicalSideBitsBStart #define LOGICAL_SIDE_I_START mozilla::eLogicalSideBitsIStart #define LOGICAL_SIDE_B_END mozilla::eLogicalSideBitsBEnd #define LOGICAL_SIDE_I_END mozilla::eLogicalSideBitsIEnd #define LOGICAL_SIDES_I_BOTH mozilla::eLogicalSideBitsIBoth #define LOGICAL_SIDES_B_BOTH mozilla::eLogicalSideBitsBBoth #define LOGICAL_SIDES_ALL mozilla::eLogicalSideBitsAll /** * LogicalSides represents a set of logical sides. */ struct LogicalSides MOZ_FINAL { LogicalSides() : mBits(0) {} explicit LogicalSides(LogicalSideBits aSideBits) { MOZ_ASSERT((aSideBits & ~eLogicalSideBitsAll) == 0, "illegal side bits"); mBits = aSideBits; } bool IsEmpty() const { return mBits == 0; } bool BStart() const { return mBits & eLogicalSideBitsBStart; } bool BEnd() const { return mBits & eLogicalSideBitsBEnd; } bool IStart() const { return mBits & eLogicalSideBitsIStart; } bool IEnd() const { return mBits & eLogicalSideBitsIEnd; } bool Contains(LogicalSideBits aSideBits) const { MOZ_ASSERT((aSideBits & ~eLogicalSideBitsAll) == 0, "illegal side bits"); return (mBits & aSideBits) == aSideBits; } LogicalSides operator|(LogicalSides aOther) const { return LogicalSides(LogicalSideBits(mBits | aOther.mBits)); } LogicalSides operator|(LogicalSideBits aSideBits) const { return *this | LogicalSides(aSideBits); } LogicalSides& operator|=(LogicalSides aOther) { mBits |= aOther.mBits; return *this; } LogicalSides& operator|=(LogicalSideBits aSideBits) { return *this |= LogicalSides(aSideBits); } bool operator==(LogicalSides aOther) const { return mBits == aOther.mBits; } bool operator!=(LogicalSides aOther) const { return !(*this == aOther); } private: uint8_t mBits; }; /** * 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/ */ 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)); } void ApplySkipSides(LogicalSides aSkipSides) { if (aSkipSides.BStart()) { BStart() = 0; } if (aSkipSides.BEnd()) { BEnd() = 0; } if (aSkipSides.IStart()) { IStart() = 0; } if (aSkipSides.IEnd()) { IEnd() = 0; } } bool IsEmpty() const { return (mMargin.left == 0 && mMargin.top == 0 && mMargin.right == 0 && mMargin.bottom == 0); } LogicalMargin operator+(const LogicalMargin& aMargin) { CHECK_WRITING_MODE(aMargin.GetWritingMode()); return LogicalMargin(GetWritingMode(), BStart() + aMargin.BStart(), IEnd() + aMargin.IEnd(), BEnd() + aMargin.BEnd(), IStart() + aMargin.IStart()); } LogicalMargin operator-(const LogicalMargin& aMargin) { CHECK_WRITING_MODE(aMargin.GetWritingMode()); return LogicalMargin(GetWritingMode(), BStart() - aMargin.BStart(), IEnd() - aMargin.IEnd(), BEnd() - aMargin.BEnd(), IStart() - aMargin.IStart()); } 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()); } } nsPoint GetPhysicalPosition(WritingMode aWritingMode, nscoord aContainerWidth) const { CHECK_WRITING_MODE(aWritingMode); if (aWritingMode.IsVertical()) { return nsPoint(aWritingMode.IsVerticalLR() ? BStart() : aContainerWidth - BEnd(), IStart()); } else { return nsPoint(aWritingMode.IsBidiLTR() ? IStart() : aContainerWidth - IEnd(), BStart()); } } #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_