зеркало из https://github.com/mozilla/gecko-dev.git
678 строки
27 KiB
C++
678 строки
27 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
|
|
/* 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/. */
|
|
|
|
#include "nsMathMLmmultiscriptsFrame.h"
|
|
|
|
#include "mozilla/dom/Document.h"
|
|
#include "mozilla/dom/Element.h"
|
|
#include "mozilla/PresShell.h"
|
|
#include "mozilla/StaticPrefs_mathml.h"
|
|
#include "nsLayoutUtils.h"
|
|
#include "nsPresContext.h"
|
|
#include <algorithm>
|
|
#include "gfxContext.h"
|
|
#include "gfxMathTable.h"
|
|
#include "gfxTextRun.h"
|
|
|
|
using namespace mozilla;
|
|
|
|
//
|
|
// <mmultiscripts> -- attach prescripts and tensor indices to a base -
|
|
// implementation <msub> -- attach a subscript to a base - implementation
|
|
// <msubsup> -- attach a subscript-superscript pair to a base - implementation
|
|
// <msup> -- attach a superscript to a base - implementation
|
|
//
|
|
|
|
nsIFrame* NS_NewMathMLmmultiscriptsFrame(PresShell* aPresShell,
|
|
ComputedStyle* aStyle) {
|
|
return new (aPresShell)
|
|
nsMathMLmmultiscriptsFrame(aStyle, aPresShell->GetPresContext());
|
|
}
|
|
|
|
NS_IMPL_FRAMEARENA_HELPERS(nsMathMLmmultiscriptsFrame)
|
|
|
|
nsMathMLmmultiscriptsFrame::~nsMathMLmmultiscriptsFrame() = default;
|
|
|
|
uint8_t nsMathMLmmultiscriptsFrame::ScriptIncrement(nsIFrame* aFrame) {
|
|
if (!aFrame) return 0;
|
|
if (mFrames.ContainsFrame(aFrame)) {
|
|
if (mFrames.FirstChild() == aFrame ||
|
|
aFrame->GetContent()->IsMathMLElement(nsGkAtoms::mprescripts_)) {
|
|
return 0; // No script increment for base frames or prescript markers
|
|
}
|
|
return 1;
|
|
}
|
|
return 0; // not a child
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsMathMLmmultiscriptsFrame::TransmitAutomaticData() {
|
|
// if our base is an embellished operator, let its state bubble to us
|
|
mPresentationData.baseFrame = mFrames.FirstChild();
|
|
GetEmbellishDataFrom(mPresentationData.baseFrame, mEmbellishData);
|
|
|
|
// The TeXbook (Ch 17. p.141) says the superscript inherits the compression
|
|
// while the subscript is compressed. So here we collect subscripts and set
|
|
// the compression flag in them.
|
|
|
|
int32_t count = 0;
|
|
bool isSubScript = !mContent->IsMathMLElement(nsGkAtoms::msup_);
|
|
|
|
AutoTArray<nsIFrame*, 8> subScriptFrames;
|
|
nsIFrame* childFrame = mFrames.FirstChild();
|
|
while (childFrame) {
|
|
if (childFrame->GetContent()->IsMathMLElement(nsGkAtoms::mprescripts_)) {
|
|
// mprescripts frame
|
|
} else if (0 == count) {
|
|
// base frame
|
|
} else {
|
|
// super/subscript block
|
|
if (isSubScript) {
|
|
// subscript
|
|
subScriptFrames.AppendElement(childFrame);
|
|
} else {
|
|
// superscript
|
|
}
|
|
PropagateFrameFlagFor(childFrame, NS_FRAME_MATHML_SCRIPT_DESCENDANT);
|
|
isSubScript = !isSubScript;
|
|
}
|
|
count++;
|
|
childFrame = childFrame->GetNextSibling();
|
|
}
|
|
for (int32_t i = subScriptFrames.Length() - 1; i >= 0; i--) {
|
|
childFrame = subScriptFrames[i];
|
|
PropagatePresentationDataFor(childFrame, NS_MATHML_COMPRESSED,
|
|
NS_MATHML_COMPRESSED);
|
|
}
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
/* virtual */
|
|
nsresult nsMathMLmmultiscriptsFrame::Place(DrawTarget* aDrawTarget,
|
|
const PlaceFlags& aFlags,
|
|
ReflowOutput& aDesiredSize) {
|
|
nscoord subScriptShift = 0;
|
|
nscoord supScriptShift = 0;
|
|
float fontSizeInflation = nsLayoutUtils::FontSizeInflationFor(this);
|
|
|
|
return PlaceMultiScript(PresContext(), aDrawTarget, aFlags, aDesiredSize,
|
|
this, subScriptShift, supScriptShift,
|
|
fontSizeInflation);
|
|
}
|
|
|
|
// exported routine that both munderover and mmultiscripts share.
|
|
// munderover uses this when movablelimits is set.
|
|
nsresult nsMathMLmmultiscriptsFrame::PlaceMultiScript(
|
|
nsPresContext* aPresContext, DrawTarget* aDrawTarget,
|
|
const PlaceFlags& aFlags, ReflowOutput& aDesiredSize,
|
|
nsMathMLContainerFrame* aFrame, nscoord aUserSubScriptShift,
|
|
nscoord aUserSupScriptShift, float aFontSizeInflation) {
|
|
nsAtom* tag = aFrame->GetContent()->NodeInfo()->NameAtom();
|
|
|
|
// This function deals with both munderover etc. as well as msubsup etc.
|
|
// As the former behaves identically to the later, we treat it as such
|
|
// to avoid additional checks later.
|
|
if (aFrame->GetContent()->IsMathMLElement(nsGkAtoms::mover_))
|
|
tag = nsGkAtoms::msup_;
|
|
else if (aFrame->GetContent()->IsMathMLElement(nsGkAtoms::munder_))
|
|
tag = nsGkAtoms::msub_;
|
|
else if (aFrame->GetContent()->IsMathMLElement(nsGkAtoms::munderover_))
|
|
tag = nsGkAtoms::msubsup_;
|
|
|
|
nsBoundingMetrics bmFrame;
|
|
|
|
nscoord minShiftFromXHeight, subDrop, supDrop;
|
|
|
|
////////////////////////////////////////
|
|
// Initialize super/sub shifts that
|
|
// depend only on the current font
|
|
////////////////////////////////////////
|
|
|
|
nsIFrame* baseFrame = aFrame->PrincipalChildList().FirstChild();
|
|
|
|
if (!baseFrame) {
|
|
if (tag == nsGkAtoms::mmultiscripts_)
|
|
aFrame->ReportErrorToConsole("NoBase");
|
|
else
|
|
aFrame->ReportChildCountError();
|
|
return aFrame->PlaceAsMrow(aDrawTarget, aFlags, aDesiredSize);
|
|
}
|
|
|
|
// get x-height (an ex)
|
|
const nsStyleFont* font = aFrame->StyleFont();
|
|
RefPtr<nsFontMetrics> fm =
|
|
nsLayoutUtils::GetFontMetricsForFrame(baseFrame, aFontSizeInflation);
|
|
|
|
nscoord xHeight = fm->XHeight();
|
|
|
|
nscoord oneDevPixel = fm->AppUnitsPerDevPixel();
|
|
RefPtr<gfxFont> mathFont = fm->GetThebesFontGroup()->GetFirstMathFont();
|
|
// scriptspace from TeX for extra spacing after sup/subscript
|
|
nscoord scriptSpace;
|
|
if (mathFont) {
|
|
scriptSpace = mathFont->MathTable()->Constant(
|
|
gfxMathTable::SpaceAfterScript, oneDevPixel);
|
|
} else {
|
|
// (0.5pt in plain TeX)
|
|
scriptSpace = nsPresContext::CSSPointsToAppUnits(0.5f);
|
|
}
|
|
|
|
// Try and read sub and sup drops from the MATH table.
|
|
if (mathFont) {
|
|
subDrop = mathFont->MathTable()->Constant(
|
|
gfxMathTable::SubscriptBaselineDropMin, oneDevPixel);
|
|
supDrop = mathFont->MathTable()->Constant(
|
|
gfxMathTable::SuperscriptBaselineDropMax, oneDevPixel);
|
|
}
|
|
|
|
// force the scriptSpace to be at least 1 pixel
|
|
nscoord onePixel = nsPresContext::CSSPixelsToAppUnits(1);
|
|
scriptSpace = std::max(onePixel, scriptSpace);
|
|
|
|
/////////////////////////////////////
|
|
// first the shift for the subscript
|
|
|
|
nscoord subScriptShift;
|
|
if (mathFont) {
|
|
// Try and get the sub script shift from the MATH table. Note that contrary
|
|
// to TeX we only have one parameter.
|
|
subScriptShift = mathFont->MathTable()->Constant(
|
|
gfxMathTable::SubscriptShiftDown, oneDevPixel);
|
|
} else {
|
|
// subScriptShift{1,2}
|
|
// = minimum amount to shift the subscript down
|
|
// = sub{1,2} in TeXbook
|
|
// subScriptShift1 = subscriptshift attribute * x-height
|
|
nscoord subScriptShift1, subScriptShift2;
|
|
// Get subScriptShift{1,2} default from font
|
|
GetSubScriptShifts(fm, subScriptShift1, subScriptShift2);
|
|
if (tag == nsGkAtoms::msub_) {
|
|
subScriptShift = subScriptShift1;
|
|
} else {
|
|
subScriptShift = std::max(subScriptShift1, subScriptShift2);
|
|
}
|
|
}
|
|
|
|
if (0 < aUserSubScriptShift) {
|
|
// the user has set the subscriptshift attribute
|
|
subScriptShift = std::max(subScriptShift, aUserSubScriptShift);
|
|
}
|
|
|
|
/////////////////////////////////////
|
|
// next the shift for the superscript
|
|
|
|
nscoord supScriptShift;
|
|
nsPresentationData presentationData;
|
|
aFrame->GetPresentationData(presentationData);
|
|
if (mathFont) {
|
|
// Try and get the super script shift from the MATH table. Note that
|
|
// contrary to TeX we only have two parameters.
|
|
supScriptShift = mathFont->MathTable()->Constant(
|
|
NS_MATHML_IS_COMPRESSED(presentationData.flags)
|
|
? gfxMathTable::SuperscriptShiftUpCramped
|
|
: gfxMathTable::SuperscriptShiftUp,
|
|
oneDevPixel);
|
|
} else {
|
|
// supScriptShift{1,2,3}
|
|
// = minimum amount to shift the supscript up
|
|
// = sup{1,2,3} in TeX
|
|
// supScriptShift1 = superscriptshift attribute * x-height
|
|
// Note that there are THREE values for supscript shifts depending
|
|
// on the current style
|
|
nscoord supScriptShift1, supScriptShift2, supScriptShift3;
|
|
// Set supScriptShift{1,2,3} default from font
|
|
GetSupScriptShifts(fm, supScriptShift1, supScriptShift2, supScriptShift3);
|
|
|
|
// get sup script shift depending on current script level and display style
|
|
// Rule 18c, App. G, TeXbook
|
|
if (font->mMathDepth == 0 && font->mMathStyle == StyleMathStyle::Normal &&
|
|
!NS_MATHML_IS_COMPRESSED(presentationData.flags)) {
|
|
// Style D in TeXbook
|
|
supScriptShift = supScriptShift1;
|
|
} else if (NS_MATHML_IS_COMPRESSED(presentationData.flags)) {
|
|
// Style C' in TeXbook = D',T',S',SS'
|
|
supScriptShift = supScriptShift3;
|
|
} else {
|
|
// everything else = T,S,SS
|
|
supScriptShift = supScriptShift2;
|
|
}
|
|
}
|
|
|
|
if (0 < aUserSupScriptShift) {
|
|
// the user has set the supscriptshift attribute
|
|
supScriptShift = std::max(supScriptShift, aUserSupScriptShift);
|
|
}
|
|
|
|
////////////////////////////////////
|
|
// Get the children's sizes
|
|
////////////////////////////////////
|
|
|
|
const WritingMode wm(aDesiredSize.GetWritingMode());
|
|
nscoord width = 0, prescriptsWidth = 0, rightBearing = 0;
|
|
nscoord minSubScriptShift = 0, minSupScriptShift = 0;
|
|
nscoord trySubScriptShift = subScriptShift;
|
|
nscoord trySupScriptShift = supScriptShift;
|
|
nscoord maxSubScriptShift = subScriptShift;
|
|
nscoord maxSupScriptShift = supScriptShift;
|
|
ReflowOutput baseSize(wm);
|
|
ReflowOutput subScriptSize(wm);
|
|
ReflowOutput supScriptSize(wm);
|
|
ReflowOutput multiSubSize(wm), multiSupSize(wm);
|
|
baseFrame = nullptr;
|
|
nsIFrame* subScriptFrame = nullptr;
|
|
nsIFrame* supScriptFrame = nullptr;
|
|
nsIFrame* prescriptsFrame = nullptr; // frame of <mprescripts/>, if there.
|
|
|
|
bool firstPrescriptsPair = false;
|
|
nsBoundingMetrics bmBase, bmSubScript, bmSupScript, bmMultiSub, bmMultiSup;
|
|
nsMargin baseMargin, subScriptMargin, supScriptMargin;
|
|
multiSubSize.SetBlockStartAscent(-0x7FFFFFFF);
|
|
multiSupSize.SetBlockStartAscent(-0x7FFFFFFF);
|
|
bmMultiSub.ascent = bmMultiSup.ascent = -0x7FFFFFFF;
|
|
bmMultiSub.descent = bmMultiSup.descent = -0x7FFFFFFF;
|
|
nscoord italicCorrection = 0;
|
|
|
|
nsBoundingMetrics boundingMetrics;
|
|
boundingMetrics.width = 0;
|
|
boundingMetrics.ascent = boundingMetrics.descent = -0x7FFFFFFF;
|
|
aDesiredSize.Width() = aDesiredSize.Height() = 0;
|
|
|
|
int32_t count = 0;
|
|
|
|
// Boolean to determine whether the current child is a subscript.
|
|
// Note that only msup starts with a superscript.
|
|
bool isSubScript = (tag != nsGkAtoms::msup_);
|
|
|
|
nsIFrame* childFrame = aFrame->PrincipalChildList().FirstChild();
|
|
while (childFrame) {
|
|
if (childFrame->GetContent()->IsMathMLElement(nsGkAtoms::mprescripts_)) {
|
|
if (tag != nsGkAtoms::mmultiscripts_) {
|
|
if (!aFlags.contains(PlaceFlag::MeasureOnly)) {
|
|
aFrame->ReportInvalidChildError(nsGkAtoms::mprescripts_);
|
|
}
|
|
return aFrame->PlaceAsMrow(aDrawTarget, aFlags, aDesiredSize);
|
|
}
|
|
if (prescriptsFrame) {
|
|
// duplicate <mprescripts/> found
|
|
// report an error, encourage people to get their markups in order
|
|
if (!aFlags.contains(PlaceFlag::MeasureOnly)) {
|
|
aFrame->ReportErrorToConsole("DuplicateMprescripts");
|
|
}
|
|
return aFrame->PlaceAsMrow(aDrawTarget, aFlags, aDesiredSize);
|
|
}
|
|
if (!isSubScript) {
|
|
if (!aFlags.contains(PlaceFlag::MeasureOnly)) {
|
|
aFrame->ReportErrorToConsole("SubSupMismatch");
|
|
}
|
|
return aFrame->PlaceAsMrow(aDrawTarget, aFlags, aDesiredSize);
|
|
}
|
|
|
|
prescriptsFrame = childFrame;
|
|
firstPrescriptsPair = true;
|
|
} else if (0 == count) {
|
|
// base
|
|
baseFrame = childFrame;
|
|
GetReflowAndBoundingMetricsFor(baseFrame, baseSize, bmBase);
|
|
baseMargin = GetMarginForPlace(aFlags, baseFrame);
|
|
|
|
if (tag != nsGkAtoms::msub_) {
|
|
// Apply italics correction if there is the potential for a
|
|
// postsupscript.
|
|
GetItalicCorrection(bmBase, italicCorrection);
|
|
// If italics correction is applied, we always add "a little to spare"
|
|
// (see TeXbook Ch.11, p.64), as we estimate the italic creation
|
|
// ourselves and it isn't the same as TeX.
|
|
italicCorrection += onePixel;
|
|
}
|
|
|
|
// we update boundingMetrics.{ascent,descent} with that
|
|
// of the baseFrame only after processing all the sup/sub pairs
|
|
boundingMetrics.width = bmBase.width + baseMargin.LeftRight();
|
|
boundingMetrics.rightBearing =
|
|
bmBase.rightBearing + baseMargin.LeftRight();
|
|
boundingMetrics.leftBearing = bmBase.leftBearing; // until overwritten
|
|
} else {
|
|
// super/subscript block
|
|
if (isSubScript) {
|
|
// subscript
|
|
subScriptFrame = childFrame;
|
|
GetReflowAndBoundingMetricsFor(subScriptFrame, subScriptSize,
|
|
bmSubScript);
|
|
subScriptMargin = GetMarginForPlace(aFlags, subScriptFrame);
|
|
|
|
if (!mathFont) {
|
|
// get the subdrop from the subscript font
|
|
GetSubDropFromChild(subScriptFrame, subDrop, aFontSizeInflation);
|
|
}
|
|
|
|
// parameter v, Rule 18a, App. G, TeXbook
|
|
minSubScriptShift = bmBase.descent + baseMargin.bottom + subDrop;
|
|
trySubScriptShift = std::max(minSubScriptShift, subScriptShift);
|
|
multiSubSize.SetBlockStartAscent(
|
|
std::max(multiSubSize.BlockStartAscent(),
|
|
subScriptSize.BlockStartAscent() + subScriptMargin.top));
|
|
bmMultiSub.ascent = std::max(bmMultiSub.ascent,
|
|
bmSubScript.ascent + subScriptMargin.top);
|
|
bmMultiSub.descent = std::max(
|
|
bmMultiSub.descent, bmSubScript.descent + subScriptMargin.bottom);
|
|
multiSubSize.Height() =
|
|
std::max(multiSubSize.Height(),
|
|
subScriptSize.Height() - subScriptSize.BlockStartAscent() +
|
|
subScriptMargin.bottom);
|
|
if (bmSubScript.width) {
|
|
width = bmSubScript.width + subScriptMargin.LeftRight() + scriptSpace;
|
|
}
|
|
rightBearing = bmSubScript.rightBearing + subScriptMargin.LeftRight();
|
|
|
|
if (tag == nsGkAtoms::msub_) {
|
|
boundingMetrics.rightBearing = boundingMetrics.width + rightBearing;
|
|
boundingMetrics.width += width;
|
|
|
|
nscoord subscriptTopMax;
|
|
if (mathFont) {
|
|
subscriptTopMax = mathFont->MathTable()->Constant(
|
|
gfxMathTable::SubscriptTopMax, oneDevPixel);
|
|
} else {
|
|
// get min subscript shift limit from x-height
|
|
// = h(x) - 4/5 * sigma_5, Rule 18b, App. G, TeXbook
|
|
subscriptTopMax = NSToCoordRound((4.0f / 5.0f) * xHeight);
|
|
}
|
|
nscoord minShiftFromXHeight =
|
|
bmSubScript.ascent + subScriptMargin.top - subscriptTopMax;
|
|
maxSubScriptShift = std::max(trySubScriptShift, minShiftFromXHeight);
|
|
|
|
maxSubScriptShift = std::max(maxSubScriptShift, trySubScriptShift);
|
|
trySubScriptShift = subScriptShift;
|
|
}
|
|
} else {
|
|
// supscript
|
|
supScriptFrame = childFrame;
|
|
GetReflowAndBoundingMetricsFor(supScriptFrame, supScriptSize,
|
|
bmSupScript);
|
|
supScriptMargin = GetMarginForPlace(aFlags, supScriptFrame);
|
|
if (!mathFont) {
|
|
// get the supdrop from the supscript font
|
|
GetSupDropFromChild(supScriptFrame, supDrop, aFontSizeInflation);
|
|
}
|
|
// parameter u, Rule 18a, App. G, TeXbook
|
|
minSupScriptShift = bmBase.ascent + baseMargin.top - supDrop;
|
|
nscoord superscriptBottomMin;
|
|
if (mathFont) {
|
|
superscriptBottomMin = mathFont->MathTable()->Constant(
|
|
gfxMathTable::SuperscriptBottomMin, oneDevPixel);
|
|
} else {
|
|
// get min supscript shift limit from x-height
|
|
// = d(x) + 1/4 * sigma_5, Rule 18c, App. G, TeXbook
|
|
superscriptBottomMin = NSToCoordRound((1.0f / 4.0f) * xHeight);
|
|
}
|
|
minShiftFromXHeight =
|
|
bmSupScript.descent + supScriptMargin.bottom + superscriptBottomMin;
|
|
trySupScriptShift = std::max(
|
|
minSupScriptShift, std::max(minShiftFromXHeight, supScriptShift));
|
|
multiSupSize.SetBlockStartAscent(
|
|
std::max(multiSupSize.BlockStartAscent(),
|
|
supScriptSize.BlockStartAscent() + supScriptMargin.top));
|
|
bmMultiSup.ascent = std::max(bmMultiSup.ascent,
|
|
bmSupScript.ascent + supScriptMargin.top);
|
|
bmMultiSup.descent = std::max(
|
|
bmMultiSup.descent, bmSupScript.descent + supScriptMargin.bottom);
|
|
multiSupSize.Height() =
|
|
std::max(multiSupSize.Height(),
|
|
supScriptSize.Height() - supScriptSize.BlockStartAscent() +
|
|
supScriptMargin.bottom);
|
|
|
|
if (bmSupScript.width)
|
|
width =
|
|
std::max(width, bmSupScript.width + supScriptMargin.LeftRight() +
|
|
scriptSpace);
|
|
|
|
if (!prescriptsFrame) { // we are still looping over base & postscripts
|
|
rightBearing = std::max(rightBearing,
|
|
italicCorrection + bmSupScript.rightBearing +
|
|
supScriptMargin.LeftRight());
|
|
boundingMetrics.rightBearing = boundingMetrics.width + rightBearing;
|
|
boundingMetrics.width += width;
|
|
} else {
|
|
prescriptsWidth += width;
|
|
if (firstPrescriptsPair) {
|
|
firstPrescriptsPair = false;
|
|
boundingMetrics.leftBearing =
|
|
std::min(bmSubScript.leftBearing, bmSupScript.leftBearing);
|
|
}
|
|
}
|
|
width = rightBearing = 0;
|
|
|
|
// negotiate between the various shifts so that
|
|
// there is enough gap between the sup and subscripts
|
|
// Rule 18e, App. G, TeXbook
|
|
if (tag == nsGkAtoms::mmultiscripts_ || tag == nsGkAtoms::msubsup_) {
|
|
nscoord subSuperscriptGapMin;
|
|
if (mathFont) {
|
|
subSuperscriptGapMin = mathFont->MathTable()->Constant(
|
|
gfxMathTable::SubSuperscriptGapMin, oneDevPixel);
|
|
} else {
|
|
nscoord ruleSize;
|
|
GetRuleThickness(aDrawTarget, fm, ruleSize);
|
|
subSuperscriptGapMin = 4 * ruleSize;
|
|
}
|
|
nscoord gap =
|
|
(trySupScriptShift - bmSupScript.descent -
|
|
supScriptMargin.bottom) -
|
|
(subScriptMargin.top + bmSubScript.ascent - trySubScriptShift);
|
|
if (gap < subSuperscriptGapMin) {
|
|
// adjust trySubScriptShift to get a gap of subSuperscriptGapMin
|
|
trySubScriptShift += subSuperscriptGapMin - gap;
|
|
}
|
|
|
|
// next we want to ensure that the bottom of the superscript
|
|
// will be > superscriptBottomMaxWithSubscript
|
|
nscoord superscriptBottomMaxWithSubscript;
|
|
if (mathFont) {
|
|
superscriptBottomMaxWithSubscript = mathFont->MathTable()->Constant(
|
|
gfxMathTable::SuperscriptBottomMaxWithSubscript, oneDevPixel);
|
|
} else {
|
|
superscriptBottomMaxWithSubscript =
|
|
NSToCoordRound((4.0f / 5.0f) * xHeight);
|
|
}
|
|
gap = superscriptBottomMaxWithSubscript -
|
|
(trySupScriptShift - bmSupScript.descent -
|
|
supScriptMargin.bottom);
|
|
if (gap > 0) {
|
|
trySupScriptShift += gap;
|
|
trySubScriptShift -= gap;
|
|
}
|
|
}
|
|
|
|
maxSubScriptShift = std::max(maxSubScriptShift, trySubScriptShift);
|
|
maxSupScriptShift = std::max(maxSupScriptShift, trySupScriptShift);
|
|
|
|
trySubScriptShift = subScriptShift;
|
|
trySupScriptShift = supScriptShift;
|
|
}
|
|
|
|
isSubScript = !isSubScript;
|
|
}
|
|
count++;
|
|
childFrame = childFrame->GetNextSibling();
|
|
}
|
|
|
|
// NoBase error may also have been reported above
|
|
if ((count != 2 && (tag == nsGkAtoms::msup_ || tag == nsGkAtoms::msub_)) ||
|
|
(count != 3 && tag == nsGkAtoms::msubsup_) || !baseFrame ||
|
|
(!isSubScript && tag == nsGkAtoms::mmultiscripts_)) {
|
|
// report an error, encourage people to get their markups in order
|
|
if (!aFlags.contains(PlaceFlag::MeasureOnly)) {
|
|
if ((count != 2 &&
|
|
(tag == nsGkAtoms::msup_ || tag == nsGkAtoms::msub_)) ||
|
|
(count != 3 && tag == nsGkAtoms::msubsup_)) {
|
|
aFrame->ReportChildCountError();
|
|
} else if (!baseFrame) {
|
|
aFrame->ReportErrorToConsole("NoBase");
|
|
} else {
|
|
aFrame->ReportErrorToConsole("SubSupMismatch");
|
|
}
|
|
}
|
|
return aFrame->PlaceAsMrow(aDrawTarget, aFlags, aDesiredSize);
|
|
}
|
|
|
|
// we left out the width of prescripts, so ...
|
|
boundingMetrics.rightBearing += prescriptsWidth;
|
|
boundingMetrics.width += prescriptsWidth;
|
|
|
|
// Zero out the shifts in where a frame isn't present to avoid the potential
|
|
// for overflow.
|
|
if (!subScriptFrame) maxSubScriptShift = 0;
|
|
if (!supScriptFrame) maxSupScriptShift = 0;
|
|
|
|
// we left out the base during our bounding box updates, so ...
|
|
if (tag == nsGkAtoms::msub_) {
|
|
boundingMetrics.ascent = std::max(bmBase.ascent + baseMargin.top,
|
|
bmMultiSub.ascent - maxSubScriptShift);
|
|
} else {
|
|
boundingMetrics.ascent = std::max(bmBase.ascent + baseMargin.top,
|
|
(bmMultiSup.ascent + maxSupScriptShift));
|
|
}
|
|
if (tag == nsGkAtoms::msup_) {
|
|
boundingMetrics.descent = std::max(bmBase.descent + baseMargin.bottom,
|
|
bmMultiSup.descent - maxSupScriptShift);
|
|
} else {
|
|
boundingMetrics.descent =
|
|
std::max(bmBase.descent + baseMargin.bottom,
|
|
(bmMultiSub.descent + maxSubScriptShift));
|
|
}
|
|
|
|
// get the reflow metrics ...
|
|
aDesiredSize.SetBlockStartAscent(
|
|
std::max(baseSize.BlockStartAscent() + baseMargin.top,
|
|
std::max(multiSubSize.BlockStartAscent() - maxSubScriptShift,
|
|
multiSupSize.BlockStartAscent() + maxSupScriptShift)));
|
|
aDesiredSize.Height() =
|
|
aDesiredSize.BlockStartAscent() +
|
|
std::max(
|
|
baseSize.Height() - baseSize.BlockStartAscent() + baseMargin.bottom,
|
|
std::max(multiSubSize.Height() + maxSubScriptShift,
|
|
multiSupSize.Height() - maxSupScriptShift));
|
|
aDesiredSize.Width() = boundingMetrics.width;
|
|
aDesiredSize.mBoundingMetrics = boundingMetrics;
|
|
|
|
// Add padding+border.
|
|
auto borderPadding = aFrame->GetBorderPaddingForPlace(aFlags);
|
|
InflateReflowAndBoundingMetrics(borderPadding, aDesiredSize, boundingMetrics);
|
|
|
|
aFrame->SetBoundingMetrics(boundingMetrics);
|
|
aFrame->SetReference(nsPoint(0, aDesiredSize.BlockStartAscent()));
|
|
|
|
//////////////////
|
|
// Place Children
|
|
|
|
// Place prescripts, followed by base, and then postscripts.
|
|
// The list of frames is in the order: {base} {postscripts} {prescripts}
|
|
// We go over the list in a circular manner, starting at <prescripts/>
|
|
|
|
if (!aFlags.contains(PlaceFlag::MeasureOnly)) {
|
|
const bool isRTL =
|
|
aFrame->StyleVisibility()->mDirection == StyleDirection::Rtl;
|
|
nscoord dx = isRTL ? borderPadding.right : borderPadding.left;
|
|
nscoord dy = 0;
|
|
|
|
// With msub and msup there is only one element and
|
|
// subscriptFrame/supScriptFrame have already been set above where
|
|
// relevant. In these cases we skip to the reflow part.
|
|
if (tag == nsGkAtoms::msub_ || tag == nsGkAtoms::msup_)
|
|
count = 1;
|
|
else
|
|
count = 0;
|
|
childFrame = prescriptsFrame;
|
|
bool isPreScript = true;
|
|
do {
|
|
if (!childFrame) { // end of prescripts,
|
|
isPreScript = false;
|
|
// place the base ...
|
|
childFrame = baseFrame;
|
|
dy = aDesiredSize.BlockStartAscent() - baseSize.BlockStartAscent();
|
|
baseMargin = GetMarginForPlace(aFlags, baseFrame);
|
|
dx += isRTL ? baseMargin.right : baseMargin.left;
|
|
FinishReflowChild(
|
|
baseFrame, aPresContext, baseSize, nullptr,
|
|
aFrame->MirrorIfRTL(aDesiredSize.Width(), baseSize.Width(), dx), dy,
|
|
ReflowChildFlags::Default);
|
|
dx += bmBase.width;
|
|
dx += isRTL ? baseMargin.left : baseMargin.right;
|
|
} else if (prescriptsFrame == childFrame) {
|
|
// Clear reflow flags of prescripts frame.
|
|
// FIXME (bug 1909417): We should call FinishReflowChild at the same
|
|
// position as baseFrame.
|
|
prescriptsFrame->DidReflow(aPresContext, nullptr);
|
|
} else {
|
|
// process each sup/sub pair
|
|
if (0 == count) {
|
|
subScriptFrame = childFrame;
|
|
count = 1;
|
|
} else if (1 == count) {
|
|
if (tag != nsGkAtoms::msub_) supScriptFrame = childFrame;
|
|
count = 0;
|
|
|
|
// get the ascent/descent of sup/subscripts stored in their rects
|
|
// rect.x = descent, rect.y = ascent
|
|
if (subScriptFrame) {
|
|
GetReflowAndBoundingMetricsFor(subScriptFrame, subScriptSize,
|
|
bmSubScript);
|
|
subScriptMargin = GetMarginForPlace(aFlags, subScriptFrame);
|
|
}
|
|
if (supScriptFrame) {
|
|
GetReflowAndBoundingMetricsFor(supScriptFrame, supScriptSize,
|
|
bmSupScript);
|
|
supScriptMargin = GetMarginForPlace(aFlags, supScriptFrame);
|
|
}
|
|
|
|
width = std::max(subScriptSize.Width() + subScriptMargin.LeftRight(),
|
|
supScriptSize.Width() + supScriptMargin.LeftRight());
|
|
|
|
if (subScriptFrame) {
|
|
nscoord x =
|
|
dx + (isRTL ? subScriptMargin.right : subScriptMargin.left);
|
|
// prescripts should be right aligned
|
|
// https://bugzilla.mozilla.org/show_bug.cgi?id=928675
|
|
if (isPreScript) {
|
|
x += width - subScriptSize.Width() - subScriptMargin.LeftRight();
|
|
}
|
|
dy = aDesiredSize.BlockStartAscent() -
|
|
subScriptSize.BlockStartAscent() + maxSubScriptShift;
|
|
FinishReflowChild(subScriptFrame, aPresContext, subScriptSize,
|
|
nullptr,
|
|
aFrame->MirrorIfRTL(aDesiredSize.Width(),
|
|
subScriptSize.Width(), x),
|
|
dy, ReflowChildFlags::Default);
|
|
}
|
|
|
|
if (supScriptFrame) {
|
|
nscoord x =
|
|
dx + (isRTL ? supScriptMargin.right : supScriptMargin.left);
|
|
if (isPreScript) {
|
|
x += width - supScriptSize.Width() - supScriptMargin.LeftRight();
|
|
} else {
|
|
// post superscripts are shifted by the italic correction value
|
|
x += italicCorrection;
|
|
}
|
|
dy = aDesiredSize.BlockStartAscent() -
|
|
supScriptSize.BlockStartAscent() - maxSupScriptShift;
|
|
FinishReflowChild(supScriptFrame, aPresContext, supScriptSize,
|
|
nullptr,
|
|
aFrame->MirrorIfRTL(aDesiredSize.Width(),
|
|
supScriptSize.Width(), x),
|
|
dy, ReflowChildFlags::Default);
|
|
}
|
|
dx += width + scriptSpace;
|
|
}
|
|
}
|
|
childFrame = childFrame->GetNextSibling();
|
|
} while (prescriptsFrame != childFrame);
|
|
}
|
|
|
|
return NS_OK;
|
|
}
|