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-rw-r--r--layout/mathml/nsMathMLmoFrame.cpp1061
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diff --git a/layout/mathml/nsMathMLmoFrame.cpp b/layout/mathml/nsMathMLmoFrame.cpp
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+++ b/layout/mathml/nsMathMLmoFrame.cpp
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+/* -*- 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 "nsMathMLmoFrame.h"
+
+#include "gfxContext.h"
+#include "mozilla/PresShell.h"
+#include "nsCSSValue.h"
+#include "nsLayoutUtils.h"
+#include "nsPresContext.h"
+#include "nsContentUtils.h"
+#include "nsFrameSelection.h"
+#include "mozilla/dom/MathMLElement.h"
+#include <algorithm>
+
+using namespace mozilla;
+
+//
+// <mo> -- operator, fence, or separator - implementation
+//
+
+nsIFrame* NS_NewMathMLmoFrame(PresShell* aPresShell, ComputedStyle* aStyle) {
+ return new (aPresShell) nsMathMLmoFrame(aStyle, aPresShell->GetPresContext());
+}
+
+NS_IMPL_FRAMEARENA_HELPERS(nsMathMLmoFrame)
+
+nsMathMLmoFrame::~nsMathMLmoFrame() = default;
+
+static const char16_t kApplyFunction = char16_t(0x2061);
+static const char16_t kInvisibleTimes = char16_t(0x2062);
+static const char16_t kInvisibleSeparator = char16_t(0x2063);
+static const char16_t kInvisiblePlus = char16_t(0x2064);
+
+eMathMLFrameType nsMathMLmoFrame::GetMathMLFrameType() {
+ return NS_MATHML_OPERATOR_IS_INVISIBLE(mFlags)
+ ? eMathMLFrameType_OperatorInvisible
+ : eMathMLFrameType_OperatorOrdinary;
+}
+
+// since a mouse click implies selection, we cannot just rely on the
+// frame's state bit in our child text frame. So we will first check
+// its selected state bit, and use this little helper to double check.
+bool nsMathMLmoFrame::IsFrameInSelection(nsIFrame* aFrame) {
+ NS_ASSERTION(aFrame, "null arg");
+ if (!aFrame || !aFrame->IsSelected()) return false;
+
+ const nsFrameSelection* frameSelection = aFrame->GetConstFrameSelection();
+ UniquePtr<SelectionDetails> details =
+ frameSelection->LookUpSelection(aFrame->GetContent(), 0, 1, true);
+
+ return details != nullptr;
+}
+
+bool nsMathMLmoFrame::UseMathMLChar() {
+ return (NS_MATHML_OPERATOR_GET_FORM(mFlags) &&
+ NS_MATHML_OPERATOR_IS_MUTABLE(mFlags)) ||
+ NS_MATHML_OPERATOR_IS_CENTERED(mFlags);
+}
+
+void nsMathMLmoFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
+ const nsDisplayListSet& aLists) {
+ bool useMathMLChar = UseMathMLChar();
+
+ if (!useMathMLChar) {
+ // let the base class do everything
+ nsMathMLTokenFrame::BuildDisplayList(aBuilder, aLists);
+ } else {
+ DisplayBorderBackgroundOutline(aBuilder, aLists);
+
+ // make our char selected if our inner child text frame is selected
+ bool isSelected = false;
+ nsRect selectedRect;
+ nsIFrame* firstChild = mFrames.FirstChild();
+ if (IsFrameInSelection(firstChild)) {
+ mMathMLChar.GetRect(selectedRect);
+ // add a one pixel border (it renders better for operators like minus)
+ selectedRect.Inflate(nsPresContext::CSSPixelsToAppUnits(1));
+ isSelected = true;
+ }
+ mMathMLChar.Display(aBuilder, this, aLists, 0,
+ isSelected ? &selectedRect : nullptr);
+
+#if defined(DEBUG) && defined(SHOW_BOUNDING_BOX)
+ // for visual debug
+ DisplayBoundingMetrics(aBuilder, this, mReference, mBoundingMetrics,
+ aLists);
+#endif
+ }
+}
+
+// get the text that we enclose and setup our nsMathMLChar
+void nsMathMLmoFrame::ProcessTextData() {
+ mFlags = 0;
+
+ nsAutoString data;
+ nsContentUtils::GetNodeTextContent(mContent, false, data);
+
+ data.CompressWhitespace();
+ int32_t length = data.Length();
+ char16_t ch = (length == 0) ? char16_t('\0') : data[0];
+
+ if ((length == 1) && (ch == kApplyFunction || ch == kInvisibleSeparator ||
+ ch == kInvisiblePlus || ch == kInvisibleTimes)) {
+ mFlags |= NS_MATHML_OPERATOR_INVISIBLE;
+ }
+
+ // don't bother doing anything special if we don't have a single child
+ if (mFrames.GetLength() != 1) {
+ data.Truncate(); // empty data to reset the char
+ mMathMLChar.SetData(data);
+ mMathMLChar.SetComputedStyle(Style());
+ return;
+ }
+
+ // special... in math mode, the usual minus sign '-' looks too short, so
+ // what we do here is to remap <mo>-</mo> to the official Unicode minus
+ // sign (U+2212) which looks much better. For background on this, see
+ // http://groups.google.com/groups?hl=en&th=66488daf1ade7635&rnum=1
+ if (1 == length && ch == '-') {
+ ch = 0x2212;
+ data = ch;
+ }
+
+ // cache the special bits: mutable, accent, movablelimits, centered.
+ // we need to do this in anticipation of other requirements, and these
+ // bits don't change. Do not reset these bits unless the text gets changed.
+
+ // lookup all the forms under which the operator is listed in the dictionary,
+ // and record whether the operator has accent="true" or movablelimits="true"
+ nsOperatorFlags allFlags = 0;
+ for (const auto& form :
+ {NS_MATHML_OPERATOR_FORM_INFIX, NS_MATHML_OPERATOR_FORM_POSTFIX,
+ NS_MATHML_OPERATOR_FORM_PREFIX}) {
+ nsOperatorFlags flags = 0;
+ float dummy;
+ if (nsMathMLOperators::LookupOperator(data, form, &flags, &dummy, &dummy)) {
+ allFlags |= flags;
+ }
+ }
+
+ mFlags |= allFlags & NS_MATHML_OPERATOR_ACCENT;
+ mFlags |= allFlags & NS_MATHML_OPERATOR_MOVABLELIMITS;
+
+ // see if this is an operator that should be centered to cater for
+ // fonts that are not math-aware
+ if (1 == length) {
+ if ((ch == '+') || (ch == '=') || (ch == '*') ||
+ (ch == 0x2212) || // &minus;
+ (ch == 0x2264) || // &le;
+ (ch == 0x2265) || // &ge;
+ (ch == 0x00D7)) { // &times;
+ mFlags |= NS_MATHML_OPERATOR_CENTERED;
+ }
+ }
+
+ // cache the operator
+ mMathMLChar.SetData(data);
+
+ // cache the native direction -- beware of bug 133429...
+ // mEmbellishData.direction must always retain our native direction, whereas
+ // mMathMLChar.GetStretchDirection() may change later, when Stretch() is
+ // called
+ mEmbellishData.direction = mMathMLChar.GetStretchDirection();
+
+ bool isMutable =
+ NS_MATHML_OPERATOR_IS_LARGEOP(allFlags) ||
+ (mEmbellishData.direction != NS_STRETCH_DIRECTION_UNSUPPORTED);
+ if (isMutable) mFlags |= NS_MATHML_OPERATOR_MUTABLE;
+
+ mMathMLChar.SetComputedStyle(Style());
+}
+
+// get our 'form' and lookup in the Operator Dictionary to fetch
+// our default data that may come from there. Then complete our setup
+// using attributes that we may have. To stay in sync, this function is
+// called very often. We depend on many things that may change around us.
+// However, we re-use unchanged values.
+void nsMathMLmoFrame::ProcessOperatorData() {
+ // if we have been here before, we will just use our cached form
+ uint8_t form = NS_MATHML_OPERATOR_GET_FORM(mFlags);
+ nsAutoString value;
+ float fontSizeInflation = nsLayoutUtils::FontSizeInflationFor(this);
+
+ // special bits are always kept in mFlags.
+ // remember the mutable bit from ProcessTextData().
+ // Some chars are listed under different forms in the dictionary,
+ // and there could be a form under which the char is mutable.
+ // If the char is the core of an embellished container, we will keep
+ // it mutable irrespective of the form of the embellished container.
+ // Also remember the other special bits that we want to carry forward.
+ mFlags &= NS_MATHML_OPERATOR_MUTABLE | NS_MATHML_OPERATOR_ACCENT |
+ NS_MATHML_OPERATOR_MOVABLELIMITS | NS_MATHML_OPERATOR_CENTERED |
+ NS_MATHML_OPERATOR_INVISIBLE;
+
+ if (!mEmbellishData.coreFrame) {
+ // i.e., we haven't been here before, the default form is infix
+ form = NS_MATHML_OPERATOR_FORM_INFIX;
+
+ // reset everything so that we don't keep outdated values around
+ // in case of dynamic changes
+ mEmbellishData.flags = 0;
+ mEmbellishData.coreFrame = nullptr;
+ mEmbellishData.leadingSpace = 0;
+ mEmbellishData.trailingSpace = 0;
+ if (mMathMLChar.Length() != 1)
+ mEmbellishData.direction = NS_STRETCH_DIRECTION_UNSUPPORTED;
+ // else... retain the native direction obtained in ProcessTextData()
+
+ if (!mFrames.FirstChild()) {
+ return;
+ }
+
+ mEmbellishData.flags |= NS_MATHML_EMBELLISH_OPERATOR;
+ mEmbellishData.coreFrame = this;
+
+ // there are two particular things that we also need to record so that if
+ // our parent is <mover>, <munder>, or <munderover>, they will treat us
+ // properly: 1) do we have accent="true" 2) do we have movablelimits="true"
+
+ // they need the extra information to decide how to treat their
+ // scripts/limits (note: <mover>, <munder>, or <munderover> need not
+ // necessarily be our direct parent -- case of embellished operators)
+
+ // default values from the Operator Dictionary were obtained in
+ // ProcessTextData() and these special bits are always kept in mFlags
+ if (NS_MATHML_OPERATOR_IS_ACCENT(mFlags))
+ mEmbellishData.flags |= NS_MATHML_EMBELLISH_ACCENT;
+ if (NS_MATHML_OPERATOR_IS_MOVABLELIMITS(mFlags))
+ mEmbellishData.flags |= NS_MATHML_EMBELLISH_MOVABLELIMITS;
+
+ // see if the accent attribute is there
+ mContent->AsElement()->GetAttr(kNameSpaceID_None, nsGkAtoms::accent_,
+ value);
+ if (value.EqualsLiteral("true"))
+ mEmbellishData.flags |= NS_MATHML_EMBELLISH_ACCENT;
+ else if (value.EqualsLiteral("false"))
+ mEmbellishData.flags &= ~NS_MATHML_EMBELLISH_ACCENT;
+
+ // see if the movablelimits attribute is there
+ mContent->AsElement()->GetAttr(kNameSpaceID_None, nsGkAtoms::movablelimits_,
+ value);
+ if (value.EqualsLiteral("true"))
+ mEmbellishData.flags |= NS_MATHML_EMBELLISH_MOVABLELIMITS;
+ else if (value.EqualsLiteral("false"))
+ mEmbellishData.flags &= ~NS_MATHML_EMBELLISH_MOVABLELIMITS;
+
+ // ---------------------------------------------------------------------
+ // we will be called again to re-sync the rest of our state next time...
+ // (nobody needs the other values below at this stage)
+ mFlags |= form;
+ return;
+ }
+
+ nsPresContext* presContext = PresContext();
+
+ // beware of bug 133814 - there is a two-way dependency in the
+ // embellished hierarchy: our embellished ancestors need to set
+ // their flags based on some of our state (set above), and here we
+ // need to re-sync our 'form' depending on our outermost embellished
+ // container. A null form here means that an earlier attempt to stretch
+ // our mMathMLChar failed, in which case we don't bother re-stretching again
+ if (form) {
+ // get our outermost embellished container and its parent.
+ // (we ensure that we are the core, not just a sibling of the core)
+ nsIFrame* embellishAncestor = this;
+ nsEmbellishData embellishData;
+ nsIFrame* parentAncestor = this;
+ do {
+ embellishAncestor = parentAncestor;
+ parentAncestor = embellishAncestor->GetParent();
+ GetEmbellishDataFrom(parentAncestor, embellishData);
+ } while (embellishData.coreFrame == this);
+
+ // flag if we have an embellished ancestor
+ if (embellishAncestor != this)
+ mFlags |= NS_MATHML_OPERATOR_EMBELLISH_ANCESTOR;
+ else
+ mFlags &= ~NS_MATHML_OPERATOR_EMBELLISH_ANCESTOR;
+
+ // find the position of our outermost embellished container w.r.t
+ // its siblings.
+
+ nsIFrame* nextSibling = embellishAncestor->GetNextSibling();
+ nsIFrame* prevSibling = embellishAncestor->GetPrevSibling();
+
+ // flag to distinguish from a real infix. Set for (embellished) operators
+ // that live in (inferred) mrows.
+ nsIMathMLFrame* mathAncestor = do_QueryFrame(parentAncestor);
+ bool zeroSpacing = false;
+ if (mathAncestor) {
+ zeroSpacing = !mathAncestor->IsMrowLike();
+ } else {
+ nsMathMLmathBlockFrame* blockFrame = do_QueryFrame(parentAncestor);
+ if (blockFrame) {
+ zeroSpacing = !blockFrame->IsMrowLike();
+ }
+ }
+ if (zeroSpacing) {
+ mFlags |= NS_MATHML_OPERATOR_EMBELLISH_ISOLATED;
+ } else {
+ mFlags &= ~NS_MATHML_OPERATOR_EMBELLISH_ISOLATED;
+ }
+
+ // find our form
+ form = NS_MATHML_OPERATOR_FORM_INFIX;
+ mContent->AsElement()->GetAttr(kNameSpaceID_None, nsGkAtoms::form, value);
+ if (!value.IsEmpty()) {
+ if (value.EqualsLiteral("prefix"))
+ form = NS_MATHML_OPERATOR_FORM_PREFIX;
+ else if (value.EqualsLiteral("postfix"))
+ form = NS_MATHML_OPERATOR_FORM_POSTFIX;
+ } else {
+ // set our form flag depending on the position
+ if (!prevSibling && nextSibling)
+ form = NS_MATHML_OPERATOR_FORM_PREFIX;
+ else if (prevSibling && !nextSibling)
+ form = NS_MATHML_OPERATOR_FORM_POSTFIX;
+ }
+ mFlags &= ~NS_MATHML_OPERATOR_FORM; // clear the old form bits
+ mFlags |= form;
+
+ // Use the default value suggested by the MathML REC.
+ // http://www.w3.org/TR/MathML/chapter3.html#presm.mo.attrs
+ // thickmathspace = 5/18em
+ float lspace = 5.0f / 18.0f;
+ float rspace = 5.0f / 18.0f;
+ // lookup the operator dictionary
+ nsAutoString data;
+ mMathMLChar.GetData(data);
+ nsOperatorFlags flags = 0;
+ if (nsMathMLOperators::LookupOperatorWithFallback(data, form, &flags,
+ &lspace, &rspace)) {
+ mFlags &= ~NS_MATHML_OPERATOR_FORM; // clear the form bits
+ mFlags |= flags; // just add bits without overwriting
+ }
+
+ // Spacing is zero if our outermost embellished operator is not in an
+ // inferred mrow.
+ if (!NS_MATHML_OPERATOR_EMBELLISH_IS_ISOLATED(mFlags) &&
+ (lspace || rspace)) {
+ // Cache the default values of lspace and rspace.
+ // since these values are relative to the 'em' unit, convert to twips now
+ nscoord em;
+ RefPtr<nsFontMetrics> fm =
+ nsLayoutUtils::GetFontMetricsForFrame(this, fontSizeInflation);
+ GetEmHeight(fm, em);
+
+ mEmbellishData.leadingSpace = NSToCoordRound(lspace * em);
+ mEmbellishData.trailingSpace = NSToCoordRound(rspace * em);
+
+ // tuning if we don't want too much extra space when we are a script.
+ // (with its fonts, TeX sets lspace=0 & rspace=0 as soon as scriptlevel>0.
+ // Our fonts can be anything, so...)
+ if (StyleFont()->mMathDepth > 0 &&
+ !NS_MATHML_OPERATOR_HAS_EMBELLISH_ANCESTOR(mFlags)) {
+ mEmbellishData.leadingSpace /= 2;
+ mEmbellishData.trailingSpace /= 2;
+ }
+ }
+ }
+
+ // If we are an accent without explicit lspace="." or rspace=".",
+ // we will ignore our default leading/trailing space
+
+ // lspace
+ //
+ // "Specifies the leading space appearing before the operator"
+ //
+ // values: length
+ // default: set by dictionary (thickmathspace)
+ //
+ // XXXfredw Support for negative and relative values is not implemented
+ // (bug 805926).
+ // Relative values will give a multiple of the current leading space,
+ // which is not necessarily the default one.
+ //
+ nscoord leadingSpace = mEmbellishData.leadingSpace;
+ mContent->AsElement()->GetAttr(kNameSpaceID_None, nsGkAtoms::lspace_, value);
+ if (!value.IsEmpty()) {
+ nsCSSValue cssValue;
+ if (dom::MathMLElement::ParseNumericValue(value, cssValue, 0,
+ mContent->OwnerDoc())) {
+ if ((eCSSUnit_Number == cssValue.GetUnit()) && !cssValue.GetFloatValue())
+ leadingSpace = 0;
+ else if (cssValue.IsLengthUnit())
+ leadingSpace = CalcLength(presContext, mComputedStyle, cssValue,
+ fontSizeInflation);
+ mFlags |= NS_MATHML_OPERATOR_LSPACE_ATTR;
+ }
+ }
+
+ // rspace
+ //
+ // "Specifies the trailing space appearing after the operator"
+ //
+ // values: length
+ // default: set by dictionary (thickmathspace)
+ //
+ // XXXfredw Support for negative and relative values is not implemented
+ // (bug 805926).
+ // Relative values will give a multiple of the current leading space,
+ // which is not necessarily the default one.
+ //
+ nscoord trailingSpace = mEmbellishData.trailingSpace;
+ mContent->AsElement()->GetAttr(kNameSpaceID_None, nsGkAtoms::rspace_, value);
+ if (!value.IsEmpty()) {
+ nsCSSValue cssValue;
+ if (dom::MathMLElement::ParseNumericValue(value, cssValue, 0,
+ mContent->OwnerDoc())) {
+ if ((eCSSUnit_Number == cssValue.GetUnit()) && !cssValue.GetFloatValue())
+ trailingSpace = 0;
+ else if (cssValue.IsLengthUnit())
+ trailingSpace = CalcLength(presContext, mComputedStyle, cssValue,
+ fontSizeInflation);
+ mFlags |= NS_MATHML_OPERATOR_RSPACE_ATTR;
+ }
+ }
+
+ // little extra tuning to round lspace & rspace to at least a pixel so that
+ // operators don't look as if they are colliding with their operands
+ if (leadingSpace || trailingSpace) {
+ nscoord onePixel = nsPresContext::CSSPixelsToAppUnits(1);
+ if (leadingSpace && leadingSpace < onePixel) leadingSpace = onePixel;
+ if (trailingSpace && trailingSpace < onePixel) trailingSpace = onePixel;
+ }
+
+ // the values that we get from our attributes override the dictionary
+ mEmbellishData.leadingSpace = leadingSpace;
+ mEmbellishData.trailingSpace = trailingSpace;
+
+ // Now see if there are user-defined attributes that override the dictionary.
+ // XXX Bug 1197771 - forcing an attribute to true when it is false in the
+ // dictionary can cause conflicts in the rest of the stretching algorithms
+ // (e.g. all largeops are assumed to have a vertical direction)
+
+ // For each attribute overriden by the user, turn off its bit flag.
+ // symmetric|movablelimits|separator|largeop|accent|fence|stretchy|form
+ // special: accent and movablelimits are handled above,
+ // don't process them here
+
+ mContent->AsElement()->GetAttr(kNameSpaceID_None, nsGkAtoms::stretchy_,
+ value);
+ if (value.EqualsLiteral("false")) {
+ mFlags &= ~NS_MATHML_OPERATOR_STRETCHY;
+ } else if (value.EqualsLiteral("true")) {
+ mFlags |= NS_MATHML_OPERATOR_STRETCHY;
+ }
+ if (NS_MATHML_OPERATOR_IS_FENCE(mFlags)) {
+ mContent->AsElement()->GetAttr(kNameSpaceID_None, nsGkAtoms::fence_, value);
+ if (value.EqualsLiteral("false"))
+ mFlags &= ~NS_MATHML_OPERATOR_FENCE;
+ else
+ mEmbellishData.flags |= NS_MATHML_EMBELLISH_FENCE;
+ }
+ mContent->AsElement()->GetAttr(kNameSpaceID_None, nsGkAtoms::largeop_, value);
+ if (value.EqualsLiteral("false")) {
+ mFlags &= ~NS_MATHML_OPERATOR_LARGEOP;
+ } else if (value.EqualsLiteral("true")) {
+ mFlags |= NS_MATHML_OPERATOR_LARGEOP;
+ }
+ if (NS_MATHML_OPERATOR_IS_SEPARATOR(mFlags)) {
+ mContent->AsElement()->GetAttr(kNameSpaceID_None, nsGkAtoms::separator_,
+ value);
+ if (value.EqualsLiteral("false"))
+ mFlags &= ~NS_MATHML_OPERATOR_SEPARATOR;
+ else
+ mEmbellishData.flags |= NS_MATHML_EMBELLISH_SEPARATOR;
+ }
+ mContent->AsElement()->GetAttr(kNameSpaceID_None, nsGkAtoms::symmetric_,
+ value);
+ if (value.EqualsLiteral("false"))
+ mFlags &= ~NS_MATHML_OPERATOR_SYMMETRIC;
+ else if (value.EqualsLiteral("true"))
+ mFlags |= NS_MATHML_OPERATOR_SYMMETRIC;
+
+ // minsize
+ //
+ // "Specifies the minimum size of the operator when stretchy"
+ //
+ // values: length
+ // default: set by dictionary (1em)
+ //
+ // We don't allow negative values.
+ // Note: Contrary to other "length" values, unitless and percentage do not
+ // give a multiple of the defaut value but a multiple of the operator at
+ // normal size.
+ //
+ mMinSize = 0;
+ mContent->AsElement()->GetAttr(kNameSpaceID_None, nsGkAtoms::minsize_, value);
+ if (!value.IsEmpty()) {
+ nsCSSValue cssValue;
+ if (dom::MathMLElement::ParseNumericValue(value, cssValue, 0,
+ mContent->OwnerDoc())) {
+ nsCSSUnit unit = cssValue.GetUnit();
+ if (eCSSUnit_Number == unit)
+ mMinSize = cssValue.GetFloatValue();
+ else if (eCSSUnit_Percent == unit)
+ mMinSize = cssValue.GetPercentValue();
+ else if (eCSSUnit_Null != unit) {
+ mMinSize = float(CalcLength(presContext, mComputedStyle, cssValue,
+ fontSizeInflation));
+ mFlags |= NS_MATHML_OPERATOR_MINSIZE_ABSOLUTE;
+ }
+ }
+ }
+
+ // maxsize
+ //
+ // "Specifies the maximum size of the operator when stretchy"
+ //
+ // values: length | "infinity"
+ // default: set by dictionary (infinity)
+ //
+ // We don't allow negative values.
+ // Note: Contrary to other "length" values, unitless and percentage do not
+ // give a multiple of the defaut value but a multiple of the operator at
+ // normal size.
+ //
+ mMaxSize = NS_MATHML_OPERATOR_SIZE_INFINITY;
+ mContent->AsElement()->GetAttr(kNameSpaceID_None, nsGkAtoms::maxsize_, value);
+ if (!value.IsEmpty()) {
+ nsCSSValue cssValue;
+ if (dom::MathMLElement::ParseNumericValue(value, cssValue, 0,
+ mContent->OwnerDoc())) {
+ nsCSSUnit unit = cssValue.GetUnit();
+ if (eCSSUnit_Number == unit)
+ mMaxSize = cssValue.GetFloatValue();
+ else if (eCSSUnit_Percent == unit)
+ mMaxSize = cssValue.GetPercentValue();
+ else if (eCSSUnit_Null != unit) {
+ mMaxSize = float(CalcLength(presContext, mComputedStyle, cssValue,
+ fontSizeInflation));
+ mFlags |= NS_MATHML_OPERATOR_MAXSIZE_ABSOLUTE;
+ }
+ }
+ }
+}
+
+static uint32_t GetStretchHint(nsOperatorFlags aFlags,
+ nsPresentationData aPresentationData,
+ bool aIsVertical,
+ const nsStyleFont* aStyleFont) {
+ uint32_t stretchHint = NS_STRETCH_NONE;
+ // See if it is okay to stretch,
+ // starting from what the Operator Dictionary said
+ if (NS_MATHML_OPERATOR_IS_MUTABLE(aFlags)) {
+ // set the largeop or largeopOnly flags to suitably cover all the
+ // 8 possible cases depending on whether displaystyle, largeop,
+ // stretchy are true or false (see bug 69325).
+ // . largeopOnly is taken if largeop=true and stretchy=false
+ // . largeop is taken if largeop=true and stretchy=true
+ if (aStyleFont->mMathStyle == StyleMathStyle::Normal &&
+ NS_MATHML_OPERATOR_IS_LARGEOP(aFlags)) {
+ stretchHint = NS_STRETCH_LARGEOP; // (largeopOnly, not mask!)
+ if (NS_MATHML_OPERATOR_IS_STRETCHY(aFlags)) {
+ stretchHint |= NS_STRETCH_NEARER | NS_STRETCH_LARGER;
+ }
+ } else if (NS_MATHML_OPERATOR_IS_STRETCHY(aFlags)) {
+ if (aIsVertical) {
+ // TeX hint. Can impact some sloppy markups missing <mrow></mrow>
+ stretchHint = NS_STRETCH_NEARER;
+ } else {
+ stretchHint = NS_STRETCH_NORMAL;
+ }
+ }
+ // else if the stretchy and largeop attributes have been disabled,
+ // the operator is not mutable
+ }
+ return stretchHint;
+}
+
+// NOTE: aDesiredStretchSize is an IN/OUT parameter
+// On input - it contains our current size
+// On output - the same size or the new size that we want
+NS_IMETHODIMP
+nsMathMLmoFrame::Stretch(DrawTarget* aDrawTarget,
+ nsStretchDirection aStretchDirection,
+ nsBoundingMetrics& aContainerSize,
+ ReflowOutput& aDesiredStretchSize) {
+ if (NS_MATHML_STRETCH_WAS_DONE(mPresentationData.flags)) {
+ NS_WARNING("it is wrong to fire stretch more than once on a frame");
+ return NS_OK;
+ }
+ mPresentationData.flags |= NS_MATHML_STRETCH_DONE;
+
+ nsIFrame* firstChild = mFrames.FirstChild();
+
+ // get the axis height;
+ float fontSizeInflation = nsLayoutUtils::FontSizeInflationFor(this);
+ RefPtr<nsFontMetrics> fm =
+ nsLayoutUtils::GetFontMetricsForFrame(this, fontSizeInflation);
+ nscoord axisHeight, height;
+ GetAxisHeight(aDrawTarget, fm, axisHeight);
+
+ // get the leading to be left at the top and the bottom of the stretched char
+ // this seems more reliable than using fm->GetLeading() on suspicious fonts
+ nscoord em;
+ GetEmHeight(fm, em);
+ nscoord leading = NSToCoordRound(0.2f * em);
+
+ // Operators that are stretchy, or those that are to be centered
+ // to cater for fonts that are not math-aware, are handled by the MathMLChar
+ // ('form' is reset if stretch fails -- i.e., we don't bother to stretch next
+ // time)
+ bool useMathMLChar = UseMathMLChar();
+
+ nsBoundingMetrics charSize;
+ nsBoundingMetrics container = aDesiredStretchSize.mBoundingMetrics;
+ bool isVertical = false;
+
+ if (((aStretchDirection == NS_STRETCH_DIRECTION_VERTICAL) ||
+ (aStretchDirection == NS_STRETCH_DIRECTION_DEFAULT)) &&
+ (mEmbellishData.direction == NS_STRETCH_DIRECTION_VERTICAL)) {
+ isVertical = true;
+ }
+
+ uint32_t stretchHint =
+ GetStretchHint(mFlags, mPresentationData, isVertical, StyleFont());
+
+ if (useMathMLChar) {
+ nsBoundingMetrics initialSize = aDesiredStretchSize.mBoundingMetrics;
+
+ if (stretchHint != NS_STRETCH_NONE) {
+ container = aContainerSize;
+
+ // some adjustments if the operator is symmetric and vertical
+
+ if (isVertical && NS_MATHML_OPERATOR_IS_SYMMETRIC(mFlags)) {
+ // we need to center about the axis
+ nscoord delta = std::max(container.ascent - axisHeight,
+ container.descent + axisHeight);
+ container.ascent = delta + axisHeight;
+ container.descent = delta - axisHeight;
+
+ // get ready in case we encounter user-desired min-max size
+ delta = std::max(initialSize.ascent - axisHeight,
+ initialSize.descent + axisHeight);
+ initialSize.ascent = delta + axisHeight;
+ initialSize.descent = delta - axisHeight;
+ }
+
+ // check for user-desired min-max size
+
+ if (mMaxSize != NS_MATHML_OPERATOR_SIZE_INFINITY && mMaxSize > 0.0f) {
+ // if we are here, there is a user defined maxsize ...
+ // XXX Set stretchHint = NS_STRETCH_NORMAL? to honor the maxsize as
+ // close as possible?
+ if (NS_MATHML_OPERATOR_MAXSIZE_IS_ABSOLUTE(mFlags)) {
+ // there is an explicit value like maxsize="20pt"
+ // try to maintain the aspect ratio of the char
+ float aspect =
+ mMaxSize / float(initialSize.ascent + initialSize.descent);
+ container.ascent =
+ std::min(container.ascent, nscoord(initialSize.ascent * aspect));
+ container.descent = std::min(container.descent,
+ nscoord(initialSize.descent * aspect));
+ // below we use a type cast instead of a conversion to avoid a VC++
+ // bug see
+ // http://support.microsoft.com/support/kb/articles/Q115/7/05.ASP
+ container.width = std::min(container.width, (nscoord)mMaxSize);
+ } else { // multiplicative value
+ container.ascent = std::min(container.ascent,
+ nscoord(initialSize.ascent * mMaxSize));
+ container.descent = std::min(container.descent,
+ nscoord(initialSize.descent * mMaxSize));
+ container.width =
+ std::min(container.width, nscoord(initialSize.width * mMaxSize));
+ }
+
+ if (isVertical && !NS_MATHML_OPERATOR_IS_SYMMETRIC(mFlags)) {
+ // re-adjust to align the char with the bottom of the initial
+ // container
+ height = container.ascent + container.descent;
+ container.descent = aContainerSize.descent;
+ container.ascent = height - container.descent;
+ }
+ }
+
+ if (mMinSize > 0.0f) {
+ // if we are here, there is a user defined minsize ...
+ // always allow the char to stretch in its natural direction,
+ // even if it is different from the caller's direction
+ if (aStretchDirection != NS_STRETCH_DIRECTION_DEFAULT &&
+ aStretchDirection != mEmbellishData.direction) {
+ aStretchDirection = NS_STRETCH_DIRECTION_DEFAULT;
+ // but when we are not honoring the requested direction
+ // we should not use the caller's container size either
+ container = initialSize;
+ }
+ if (NS_MATHML_OPERATOR_MINSIZE_IS_ABSOLUTE(mFlags)) {
+ // there is an explicit value like minsize="20pt"
+ // try to maintain the aspect ratio of the char
+ float aspect =
+ mMinSize / float(initialSize.ascent + initialSize.descent);
+ container.ascent =
+ std::max(container.ascent, nscoord(initialSize.ascent * aspect));
+ container.descent = std::max(container.descent,
+ nscoord(initialSize.descent * aspect));
+ container.width = std::max(container.width, (nscoord)mMinSize);
+ } else { // multiplicative value
+ container.ascent = std::max(container.ascent,
+ nscoord(initialSize.ascent * mMinSize));
+ container.descent = std::max(container.descent,
+ nscoord(initialSize.descent * mMinSize));
+ container.width =
+ std::max(container.width, nscoord(initialSize.width * mMinSize));
+ }
+
+ if (isVertical && !NS_MATHML_OPERATOR_IS_SYMMETRIC(mFlags)) {
+ // re-adjust to align the char with the bottom of the initial
+ // container
+ height = container.ascent + container.descent;
+ container.descent = aContainerSize.descent;
+ container.ascent = height - container.descent;
+ }
+ }
+ }
+
+ // let the MathMLChar stretch itself...
+ nsresult res = mMathMLChar.Stretch(
+ this, aDrawTarget, fontSizeInflation, aStretchDirection, container,
+ charSize, stretchHint,
+ StyleVisibility()->mDirection == StyleDirection::Rtl);
+ if (NS_FAILED(res)) {
+ // gracefully handle cases where stretching the char failed (i.e.,
+ // GetBoundingMetrics failed) clear our 'form' to behave as if the
+ // operator wasn't in the dictionary
+ mFlags &= ~NS_MATHML_OPERATOR_FORM;
+ useMathMLChar = false;
+ }
+ }
+
+ // Place our children using the default method
+ // This will allow our child text frame to get its DidReflow()
+ nsresult rv = Place(aDrawTarget, true, aDesiredStretchSize);
+ if (NS_MATHML_HAS_ERROR(mPresentationData.flags) || NS_FAILED(rv)) {
+ // Make sure the child frames get their DidReflow() calls.
+ DidReflowChildren(mFrames.FirstChild());
+ }
+
+ if (useMathMLChar) {
+ // update our bounding metrics... it becomes that of our MathML char
+ mBoundingMetrics = charSize;
+
+ // if the returned direction is 'unsupported', the char didn't actually
+ // change. So we do the centering only if necessary
+ if (mMathMLChar.GetStretchDirection() != NS_STRETCH_DIRECTION_UNSUPPORTED ||
+ NS_MATHML_OPERATOR_IS_CENTERED(mFlags)) {
+ bool largeopOnly = (NS_STRETCH_LARGEOP & stretchHint) != 0 &&
+ (NS_STRETCH_VARIABLE_MASK & stretchHint) == 0;
+
+ if (isVertical || NS_MATHML_OPERATOR_IS_CENTERED(mFlags)) {
+ // the desired size returned by mMathMLChar maybe different
+ // from the size of the container.
+ // the mMathMLChar.mRect.y calculation is subtle, watch out!!!
+
+ height = mBoundingMetrics.ascent + mBoundingMetrics.descent;
+ if (NS_MATHML_OPERATOR_IS_SYMMETRIC(mFlags) ||
+ NS_MATHML_OPERATOR_IS_CENTERED(mFlags)) {
+ // For symmetric and vertical operators, or for operators that are
+ // always centered ('+', '*', etc) we want to center about the axis of
+ // the container
+ mBoundingMetrics.descent = height / 2 - axisHeight;
+ } else if (!largeopOnly) {
+ // Align the center of the char with the center of the container
+ mBoundingMetrics.descent =
+ height / 2 + (container.ascent + container.descent) / 2 -
+ container.ascent;
+ } // else align the baselines
+ mBoundingMetrics.ascent = height - mBoundingMetrics.descent;
+ }
+ }
+ }
+
+ // Fixup for the final height.
+ // On one hand, our stretchy height can sometimes be shorter than surrounding
+ // ASCII chars, e.g., arrow symbols have |mBoundingMetrics.ascent + leading|
+ // that is smaller than the ASCII's ascent, hence when painting the background
+ // later, it won't look uniform along the line.
+ // On the other hand, sometimes we may leave too much gap when our glyph
+ // happens to come from a font with tall glyphs. For example, since CMEX10 has
+ // very tall glyphs, its natural font metrics are large, even if we pick a
+ // small glyph whose size is comparable to the size of a normal ASCII glyph.
+ // So to avoid uneven spacing in either of these two cases, we use the height
+ // of the ASCII font as a reference and try to match it if possible.
+
+ // special case for accents... keep them short to improve mouse operations...
+ // an accent can only be the non-first child of <mover>, <munder>,
+ // <munderover>
+ bool isAccent = NS_MATHML_EMBELLISH_IS_ACCENT(mEmbellishData.flags);
+ if (isAccent) {
+ nsEmbellishData parentData;
+ GetEmbellishDataFrom(GetParent(), parentData);
+ isAccent = (NS_MATHML_EMBELLISH_IS_ACCENTOVER(parentData.flags) ||
+ NS_MATHML_EMBELLISH_IS_ACCENTUNDER(parentData.flags)) &&
+ parentData.coreFrame != this;
+ }
+ if (isAccent && firstChild) {
+ // see bug 188467 for what is going on here
+ nscoord dy = aDesiredStretchSize.BlockStartAscent() -
+ (mBoundingMetrics.ascent + leading);
+ aDesiredStretchSize.SetBlockStartAscent(mBoundingMetrics.ascent + leading);
+ aDesiredStretchSize.Height() =
+ aDesiredStretchSize.BlockStartAscent() + mBoundingMetrics.descent;
+
+ firstChild->SetPosition(firstChild->GetPosition() - nsPoint(0, dy));
+ } else if (useMathMLChar) {
+ nscoord ascent = fm->MaxAscent();
+ nscoord descent = fm->MaxDescent();
+ aDesiredStretchSize.SetBlockStartAscent(
+ std::max(mBoundingMetrics.ascent + leading, ascent));
+ aDesiredStretchSize.Height() =
+ aDesiredStretchSize.BlockStartAscent() +
+ std::max(mBoundingMetrics.descent + leading, descent);
+ }
+ aDesiredStretchSize.Width() = mBoundingMetrics.width;
+ aDesiredStretchSize.mBoundingMetrics = mBoundingMetrics;
+ mReference.x = 0;
+ mReference.y = aDesiredStretchSize.BlockStartAscent();
+ // Place our mMathMLChar, its origin is in our coordinate system
+ if (useMathMLChar) {
+ nscoord dy =
+ aDesiredStretchSize.BlockStartAscent() - mBoundingMetrics.ascent;
+ mMathMLChar.SetRect(
+ nsRect(0, dy, charSize.width, charSize.ascent + charSize.descent));
+ }
+
+ // Before we leave... there is a last item in the check-list:
+ // If our parent is not embellished, it means we are the outermost embellished
+ // container and so we put the spacing, otherwise we don't include the
+ // spacing, the outermost embellished container will take care of it.
+
+ if (!NS_MATHML_OPERATOR_HAS_EMBELLISH_ANCESTOR(mFlags)) {
+ // Account the spacing if we are not an accent with explicit attributes
+ nscoord leadingSpace = mEmbellishData.leadingSpace;
+ if (isAccent && !NS_MATHML_OPERATOR_HAS_LSPACE_ATTR(mFlags)) {
+ leadingSpace = 0;
+ }
+ nscoord trailingSpace = mEmbellishData.trailingSpace;
+ if (isAccent && !NS_MATHML_OPERATOR_HAS_RSPACE_ATTR(mFlags)) {
+ trailingSpace = 0;
+ }
+
+ mBoundingMetrics.width += leadingSpace + trailingSpace;
+ aDesiredStretchSize.Width() = mBoundingMetrics.width;
+ aDesiredStretchSize.mBoundingMetrics.width = mBoundingMetrics.width;
+
+ nscoord dx = StyleVisibility()->mDirection == StyleDirection::Rtl
+ ? trailingSpace
+ : leadingSpace;
+ if (dx) {
+ // adjust the offsets
+ mBoundingMetrics.leftBearing += dx;
+ mBoundingMetrics.rightBearing += dx;
+ aDesiredStretchSize.mBoundingMetrics.leftBearing += dx;
+ aDesiredStretchSize.mBoundingMetrics.rightBearing += dx;
+
+ if (useMathMLChar) {
+ nsRect rect;
+ mMathMLChar.GetRect(rect);
+ mMathMLChar.SetRect(
+ nsRect(rect.x + dx, rect.y, rect.width, rect.height));
+ } else {
+ nsIFrame* childFrame = firstChild;
+ while (childFrame) {
+ childFrame->SetPosition(childFrame->GetPosition() + nsPoint(dx, 0));
+ childFrame = childFrame->GetNextSibling();
+ }
+ }
+ }
+ }
+
+ // Finished with these:
+ ClearSavedChildMetrics();
+ // Set our overflow area
+ GatherAndStoreOverflow(&aDesiredStretchSize);
+
+ // There used to be code here to change the height of the child frame to
+ // change the caret height, but the text frame that manages the caret is now
+ // not a direct child but wrapped in a block frame. See also bug 412033.
+
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+nsMathMLmoFrame::InheritAutomaticData(nsIFrame* aParent) {
+ // retain our native direction, it only changes if our text content changes
+ nsStretchDirection direction = mEmbellishData.direction;
+ nsMathMLTokenFrame::InheritAutomaticData(aParent);
+ ProcessTextData();
+ mEmbellishData.direction = direction;
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+nsMathMLmoFrame::TransmitAutomaticData() {
+ // this will cause us to re-sync our flags from scratch
+ // but our returned 'form' is still not final (bug 133429), it will
+ // be recomputed to its final value during the next call in Reflow()
+ mEmbellishData.coreFrame = nullptr;
+ ProcessOperatorData();
+ return NS_OK;
+}
+
+void nsMathMLmoFrame::SetInitialChildList(ChildListID aListID,
+ nsFrameList&& aChildList) {
+ // First, let the parent class do its work
+ nsMathMLTokenFrame::SetInitialChildList(aListID, std::move(aChildList));
+ ProcessTextData();
+}
+
+void nsMathMLmoFrame::Reflow(nsPresContext* aPresContext,
+ ReflowOutput& aDesiredSize,
+ const ReflowInput& aReflowInput,
+ nsReflowStatus& aStatus) {
+ MOZ_ASSERT(aStatus.IsEmpty(), "Caller should pass a fresh reflow status!");
+
+ // certain values use units that depend on our ComputedStyle, so
+ // it is safer to just process the whole lot here
+ ProcessOperatorData();
+
+ nsMathMLTokenFrame::Reflow(aPresContext, aDesiredSize, aReflowInput, aStatus);
+}
+
+nsresult nsMathMLmoFrame::Place(DrawTarget* aDrawTarget, bool aPlaceOrigin,
+ ReflowOutput& aDesiredSize) {
+ nsresult rv =
+ nsMathMLTokenFrame::Place(aDrawTarget, aPlaceOrigin, aDesiredSize);
+
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+
+ /* Special behaviour for largeops.
+ In MathML "stretchy" and displaystyle "largeop" are different notions,
+ even if we use the same technique to draw them (picking size variants).
+ So largeop display operators should be considered "non-stretchy" and
+ thus their sizes should be taken into account for the stretch size of
+ other elements.
+
+ This is a preliminary stretch - exact sizing/placement is handled by the
+ Stretch() method.
+ */
+
+ if (!aPlaceOrigin && StyleFont()->mMathStyle == StyleMathStyle::Normal &&
+ NS_MATHML_OPERATOR_IS_LARGEOP(mFlags) && UseMathMLChar()) {
+ nsBoundingMetrics newMetrics;
+ rv = mMathMLChar.Stretch(
+ this, aDrawTarget, nsLayoutUtils::FontSizeInflationFor(this),
+ NS_STRETCH_DIRECTION_VERTICAL, aDesiredSize.mBoundingMetrics,
+ newMetrics, NS_STRETCH_LARGEOP,
+ StyleVisibility()->mDirection == StyleDirection::Rtl);
+
+ if (NS_FAILED(rv)) {
+ // Just use the initial size
+ return NS_OK;
+ }
+
+ aDesiredSize.mBoundingMetrics = newMetrics;
+ /* Treat the ascent/descent values calculated in the TokenFrame place
+ calculations as the minimum for aDesiredSize calculations, rather
+ than fetching them from font metrics again.
+ */
+ aDesiredSize.SetBlockStartAscent(
+ std::max(mBoundingMetrics.ascent, newMetrics.ascent));
+ aDesiredSize.Height() =
+ aDesiredSize.BlockStartAscent() +
+ std::max(mBoundingMetrics.descent, newMetrics.descent);
+ aDesiredSize.Width() = newMetrics.width;
+ mBoundingMetrics = newMetrics;
+ }
+ return NS_OK;
+}
+
+/* virtual */
+void nsMathMLmoFrame::MarkIntrinsicISizesDirty() {
+ // if we get this, it may mean that something changed in the text
+ // content. So blow away everything an re-build the automatic data
+ // from the parent of our outermost embellished container (we ensure
+ // that we are the core, not just a sibling of the core)
+
+ ProcessTextData();
+
+ nsIFrame* target = this;
+ nsEmbellishData embellishData;
+ do {
+ target = target->GetParent();
+ GetEmbellishDataFrom(target, embellishData);
+ } while (embellishData.coreFrame == this);
+
+ // we have automatic data to update in the children of the target frame
+ // XXXldb This should really be marking dirty rather than rebuilding
+ // so that we don't rebuild multiple times for the same change.
+ RebuildAutomaticDataForChildren(target);
+
+ nsMathMLContainerFrame::MarkIntrinsicISizesDirty();
+}
+
+/* virtual */
+void nsMathMLmoFrame::GetIntrinsicISizeMetrics(gfxContext* aRenderingContext,
+ ReflowOutput& aDesiredSize) {
+ ProcessOperatorData();
+ if (UseMathMLChar()) {
+ uint32_t stretchHint =
+ GetStretchHint(mFlags, mPresentationData, true, StyleFont());
+ aDesiredSize.Width() = mMathMLChar.GetMaxWidth(
+ this, aRenderingContext->GetDrawTarget(),
+ nsLayoutUtils::FontSizeInflationFor(this), stretchHint);
+ } else {
+ nsMathMLTokenFrame::GetIntrinsicISizeMetrics(aRenderingContext,
+ aDesiredSize);
+ }
+
+ // leadingSpace and trailingSpace are actually applied to the outermost
+ // embellished container but for determining total intrinsic width it should
+ // be safe to include it for the core here instead.
+ bool isRTL = StyleVisibility()->mDirection == StyleDirection::Rtl;
+ aDesiredSize.Width() +=
+ mEmbellishData.leadingSpace + mEmbellishData.trailingSpace;
+ aDesiredSize.mBoundingMetrics.width = aDesiredSize.Width();
+ if (isRTL) {
+ aDesiredSize.mBoundingMetrics.leftBearing += mEmbellishData.trailingSpace;
+ aDesiredSize.mBoundingMetrics.rightBearing += mEmbellishData.trailingSpace;
+ } else {
+ aDesiredSize.mBoundingMetrics.leftBearing += mEmbellishData.leadingSpace;
+ aDesiredSize.mBoundingMetrics.rightBearing += mEmbellishData.leadingSpace;
+ }
+}
+
+nsresult nsMathMLmoFrame::AttributeChanged(int32_t aNameSpaceID,
+ nsAtom* aAttribute,
+ int32_t aModType) {
+ // check if this is an attribute that can affect the embellished hierarchy
+ // in a significant way and re-layout the entire hierarchy.
+ if (nsGkAtoms::accent_ == aAttribute ||
+ nsGkAtoms::movablelimits_ == aAttribute) {
+ // set the target as the parent of our outermost embellished container
+ // (we ensure that we are the core, not just a sibling of the core)
+ nsIFrame* target = this;
+ nsEmbellishData embellishData;
+ do {
+ target = target->GetParent();
+ GetEmbellishDataFrom(target, embellishData);
+ } while (embellishData.coreFrame == this);
+
+ // we have automatic data to update in the children of the target frame
+ return ReLayoutChildren(target);
+ }
+
+ return nsMathMLTokenFrame::AttributeChanged(aNameSpaceID, aAttribute,
+ aModType);
+}
+
+void nsMathMLmoFrame::DidSetComputedStyle(ComputedStyle* aOldStyle) {
+ nsMathMLTokenFrame::DidSetComputedStyle(aOldStyle);
+ mMathMLChar.SetComputedStyle(Style());
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-03 03:31:28 +0000