forked from mirrors/gecko-dev
681 lines
26 KiB
C++
681 lines
26 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsMathMLmmultiscriptsFrame.h"
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#include "nsPresContext.h"
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#include <algorithm>
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#include "gfxContext.h"
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#include "gfxMathTable.h"
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using namespace mozilla;
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//
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// <mmultiscripts> -- attach prescripts and tensor indices to a base -
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// implementation <msub> -- attach a subscript to a base - implementation
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// <msubsup> -- attach a subscript-superscript pair to a base - implementation
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// <msup> -- attach a superscript to a base - implementation
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//
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nsIFrame* NS_NewMathMLmmultiscriptsFrame(nsIPresShell* aPresShell,
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ComputedStyle* aStyle) {
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return new (aPresShell)
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nsMathMLmmultiscriptsFrame(aStyle, aPresShell->GetPresContext());
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}
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NS_IMPL_FRAMEARENA_HELPERS(nsMathMLmmultiscriptsFrame)
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nsMathMLmmultiscriptsFrame::~nsMathMLmmultiscriptsFrame() {}
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uint8_t nsMathMLmmultiscriptsFrame::ScriptIncrement(nsIFrame* aFrame) {
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if (!aFrame) return 0;
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if (mFrames.ContainsFrame(aFrame)) {
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if (mFrames.FirstChild() == aFrame ||
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aFrame->GetContent()->IsMathMLElement(nsGkAtoms::mprescripts_)) {
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return 0; // No script increment for base frames or prescript markers
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}
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return 1;
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}
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return 0; // not a child
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}
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NS_IMETHODIMP
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nsMathMLmmultiscriptsFrame::TransmitAutomaticData() {
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// if our base is an embellished operator, let its state bubble to us
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mPresentationData.baseFrame = mFrames.FirstChild();
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GetEmbellishDataFrom(mPresentationData.baseFrame, mEmbellishData);
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// The TeXbook (Ch 17. p.141) says the superscript inherits the compression
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// while the subscript is compressed. So here we collect subscripts and set
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// the compression flag in them.
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int32_t count = 0;
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bool isSubScript = !mContent->IsMathMLElement(nsGkAtoms::msup_);
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AutoTArray<nsIFrame*, 8> subScriptFrames;
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nsIFrame* childFrame = mFrames.FirstChild();
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while (childFrame) {
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if (childFrame->GetContent()->IsMathMLElement(nsGkAtoms::mprescripts_)) {
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// mprescripts frame
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} else if (0 == count) {
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// base frame
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} else {
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// super/subscript block
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if (isSubScript) {
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// subscript
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subScriptFrames.AppendElement(childFrame);
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} else {
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// superscript
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}
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PropagateFrameFlagFor(childFrame, NS_FRAME_MATHML_SCRIPT_DESCENDANT);
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isSubScript = !isSubScript;
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}
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count++;
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childFrame = childFrame->GetNextSibling();
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}
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for (int32_t i = subScriptFrames.Length() - 1; i >= 0; i--) {
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childFrame = subScriptFrames[i];
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PropagatePresentationDataFor(childFrame, NS_MATHML_COMPRESSED,
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NS_MATHML_COMPRESSED);
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}
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return NS_OK;
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}
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/* virtual */ nsresult nsMathMLmmultiscriptsFrame::Place(
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DrawTarget* aDrawTarget, bool aPlaceOrigin, ReflowOutput& aDesiredSize) {
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nscoord subScriptShift = 0;
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nscoord supScriptShift = 0;
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float fontSizeInflation = nsLayoutUtils::FontSizeInflationFor(this);
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// subscriptshift
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//
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// "Specifies the minimum amount to shift the baseline of subscript down; the
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// default is for the rendering agent to use its own positioning rules."
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//
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// values: length
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// default: automatic
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//
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// We use 0 as the default value so unitless values can be ignored.
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// As a minimum, negative values can be ignored.
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//
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nsAutoString value;
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if (!mContent->IsMathMLElement(nsGkAtoms::msup_)) {
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mContent->AsElement()->GetAttr(kNameSpaceID_None,
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nsGkAtoms::subscriptshift_, value);
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if (!value.IsEmpty()) {
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ParseNumericValue(value, &subScriptShift, 0, PresContext(),
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mComputedStyle, fontSizeInflation);
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}
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}
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// superscriptshift
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//
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// "Specifies the minimum amount to shift the baseline of superscript up; the
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// default is for the rendering agent to use its own positioning rules."
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//
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// values: length
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// default: automatic
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//
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// We use 0 as the default value so unitless values can be ignored.
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// As a minimum, negative values can be ignored.
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//
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if (!mContent->IsMathMLElement(nsGkAtoms::msub_)) {
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mContent->AsElement()->GetAttr(kNameSpaceID_None,
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nsGkAtoms::superscriptshift_, value);
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if (!value.IsEmpty()) {
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ParseNumericValue(value, &supScriptShift, 0, PresContext(),
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mComputedStyle, fontSizeInflation);
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}
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}
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return PlaceMultiScript(PresContext(), aDrawTarget, aPlaceOrigin,
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aDesiredSize, this, subScriptShift, supScriptShift,
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fontSizeInflation);
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}
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// exported routine that both munderover and mmultiscripts share.
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// munderover uses this when movablelimits is set.
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nsresult nsMathMLmmultiscriptsFrame::PlaceMultiScript(
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nsPresContext* aPresContext, DrawTarget* aDrawTarget, bool aPlaceOrigin,
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ReflowOutput& aDesiredSize, nsMathMLContainerFrame* aFrame,
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nscoord aUserSubScriptShift, nscoord aUserSupScriptShift,
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float aFontSizeInflation) {
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nsAtom* tag = aFrame->GetContent()->NodeInfo()->NameAtom();
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// This function deals with both munderover etc. as well as msubsup etc.
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// As the former behaves identically to the later, we treat it as such
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// to avoid additional checks later.
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if (aFrame->GetContent()->IsMathMLElement(nsGkAtoms::mover_))
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tag = nsGkAtoms::msup_;
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else if (aFrame->GetContent()->IsMathMLElement(nsGkAtoms::munder_))
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tag = nsGkAtoms::msub_;
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else if (aFrame->GetContent()->IsMathMLElement(nsGkAtoms::munderover_))
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tag = nsGkAtoms::msubsup_;
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nsBoundingMetrics bmFrame;
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nscoord minShiftFromXHeight, subDrop, supDrop;
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////////////////////////////////////////
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// Initialize super/sub shifts that
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// depend only on the current font
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////////////////////////////////////////
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nsIFrame* baseFrame = aFrame->PrincipalChildList().FirstChild();
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if (!baseFrame) {
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if (tag == nsGkAtoms::mmultiscripts_)
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aFrame->ReportErrorToConsole("NoBase");
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else
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aFrame->ReportChildCountError();
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return aFrame->ReflowError(aDrawTarget, aDesiredSize);
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}
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// get x-height (an ex)
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const nsStyleFont* font = aFrame->StyleFont();
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RefPtr<nsFontMetrics> fm =
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nsLayoutUtils::GetFontMetricsForFrame(baseFrame, aFontSizeInflation);
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nscoord xHeight = fm->XHeight();
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nscoord oneDevPixel = fm->AppUnitsPerDevPixel();
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gfxFont* mathFont = fm->GetThebesFontGroup()->GetFirstMathFont();
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// scriptspace from TeX for extra spacing after sup/subscript
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nscoord scriptSpace;
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if (mathFont) {
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scriptSpace = mathFont->MathTable()->Constant(
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gfxMathTable::SpaceAfterScript, oneDevPixel);
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} else {
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// (0.5pt in plain TeX)
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scriptSpace = nsPresContext::CSSPointsToAppUnits(0.5f);
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}
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// Try and read sub and sup drops from the MATH table.
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if (mathFont) {
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subDrop = mathFont->MathTable()->Constant(
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gfxMathTable::SubscriptBaselineDropMin, oneDevPixel);
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supDrop = mathFont->MathTable()->Constant(
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gfxMathTable::SuperscriptBaselineDropMax, oneDevPixel);
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}
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// force the scriptSpace to be at least 1 pixel
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nscoord onePixel = nsPresContext::CSSPixelsToAppUnits(1);
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scriptSpace = std::max(onePixel, scriptSpace);
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/////////////////////////////////////
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// first the shift for the subscript
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nscoord subScriptShift;
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if (mathFont) {
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// Try and get the sub script shift from the MATH table. Note that contrary
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// to TeX we only have one parameter.
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subScriptShift = mathFont->MathTable()->Constant(
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gfxMathTable::SubscriptShiftDown, oneDevPixel);
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} else {
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// subScriptShift{1,2}
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// = minimum amount to shift the subscript down
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// = sub{1,2} in TeXbook
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// subScriptShift1 = subscriptshift attribute * x-height
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nscoord subScriptShift1, subScriptShift2;
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// Get subScriptShift{1,2} default from font
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GetSubScriptShifts(fm, subScriptShift1, subScriptShift2);
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if (tag == nsGkAtoms::msub_) {
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subScriptShift = subScriptShift1;
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} else {
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subScriptShift = std::max(subScriptShift1, subScriptShift2);
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}
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}
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if (0 < aUserSubScriptShift) {
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// the user has set the subscriptshift attribute
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subScriptShift = std::max(subScriptShift, aUserSubScriptShift);
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}
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/////////////////////////////////////
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// next the shift for the superscript
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nscoord supScriptShift;
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nsPresentationData presentationData;
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aFrame->GetPresentationData(presentationData);
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if (mathFont) {
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// Try and get the super script shift from the MATH table. Note that
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// contrary to TeX we only have two parameters.
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supScriptShift = mathFont->MathTable()->Constant(
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NS_MATHML_IS_COMPRESSED(presentationData.flags)
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? gfxMathTable::SuperscriptShiftUpCramped
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: gfxMathTable::SuperscriptShiftUp,
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oneDevPixel);
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} else {
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// supScriptShift{1,2,3}
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// = minimum amount to shift the supscript up
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// = sup{1,2,3} in TeX
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// supScriptShift1 = superscriptshift attribute * x-height
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// Note that there are THREE values for supscript shifts depending
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// on the current style
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nscoord supScriptShift1, supScriptShift2, supScriptShift3;
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// Set supScriptShift{1,2,3} default from font
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GetSupScriptShifts(fm, supScriptShift1, supScriptShift2, supScriptShift3);
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// get sup script shift depending on current script level and display style
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// Rule 18c, App. G, TeXbook
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if (font->mScriptLevel == 0 &&
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font->mMathDisplay == NS_MATHML_DISPLAYSTYLE_BLOCK &&
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!NS_MATHML_IS_COMPRESSED(presentationData.flags)) {
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// Style D in TeXbook
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supScriptShift = supScriptShift1;
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} else if (NS_MATHML_IS_COMPRESSED(presentationData.flags)) {
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// Style C' in TeXbook = D',T',S',SS'
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supScriptShift = supScriptShift3;
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} else {
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// everything else = T,S,SS
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supScriptShift = supScriptShift2;
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}
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}
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if (0 < aUserSupScriptShift) {
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// the user has set the supscriptshift attribute
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supScriptShift = std::max(supScriptShift, aUserSupScriptShift);
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}
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////////////////////////////////////
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// Get the children's sizes
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////////////////////////////////////
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const WritingMode wm(aDesiredSize.GetWritingMode());
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nscoord width = 0, prescriptsWidth = 0, rightBearing = 0;
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nscoord minSubScriptShift = 0, minSupScriptShift = 0;
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nscoord trySubScriptShift = subScriptShift;
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nscoord trySupScriptShift = supScriptShift;
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nscoord maxSubScriptShift = subScriptShift;
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nscoord maxSupScriptShift = supScriptShift;
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ReflowOutput baseSize(wm);
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ReflowOutput subScriptSize(wm);
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ReflowOutput supScriptSize(wm);
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ReflowOutput multiSubSize(wm), multiSupSize(wm);
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baseFrame = nullptr;
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nsIFrame* subScriptFrame = nullptr;
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nsIFrame* supScriptFrame = nullptr;
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nsIFrame* prescriptsFrame = nullptr; // frame of <mprescripts/>, if there.
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bool firstPrescriptsPair = false;
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nsBoundingMetrics bmBase, bmSubScript, bmSupScript, bmMultiSub, bmMultiSup;
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multiSubSize.SetBlockStartAscent(-0x7FFFFFFF);
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multiSupSize.SetBlockStartAscent(-0x7FFFFFFF);
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bmMultiSub.ascent = bmMultiSup.ascent = -0x7FFFFFFF;
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bmMultiSub.descent = bmMultiSup.descent = -0x7FFFFFFF;
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nscoord italicCorrection = 0;
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nsBoundingMetrics boundingMetrics;
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boundingMetrics.width = 0;
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boundingMetrics.ascent = boundingMetrics.descent = -0x7FFFFFFF;
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aDesiredSize.Width() = aDesiredSize.Height() = 0;
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int32_t count = 0;
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bool foundNoneTag = false;
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// Boolean to determine whether the current child is a subscript.
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// Note that only msup starts with a superscript.
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bool isSubScript = (tag != nsGkAtoms::msup_);
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nsIFrame* childFrame = aFrame->PrincipalChildList().FirstChild();
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while (childFrame) {
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if (childFrame->GetContent()->IsMathMLElement(nsGkAtoms::mprescripts_)) {
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if (tag != nsGkAtoms::mmultiscripts_) {
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if (aPlaceOrigin) {
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aFrame->ReportInvalidChildError(nsGkAtoms::mprescripts_);
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}
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return aFrame->ReflowError(aDrawTarget, aDesiredSize);
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}
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if (prescriptsFrame) {
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// duplicate <mprescripts/> found
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// report an error, encourage people to get their markups in order
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if (aPlaceOrigin) {
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aFrame->ReportErrorToConsole("DuplicateMprescripts");
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}
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return aFrame->ReflowError(aDrawTarget, aDesiredSize);
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}
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if (!isSubScript) {
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if (aPlaceOrigin) {
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aFrame->ReportErrorToConsole("SubSupMismatch");
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}
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return aFrame->ReflowError(aDrawTarget, aDesiredSize);
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}
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prescriptsFrame = childFrame;
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firstPrescriptsPair = true;
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} else if (0 == count) {
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// base
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if (childFrame->GetContent()->IsMathMLElement(nsGkAtoms::none)) {
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if (tag == nsGkAtoms::mmultiscripts_) {
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if (aPlaceOrigin) {
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aFrame->ReportErrorToConsole("NoBase");
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}
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return aFrame->ReflowError(aDrawTarget, aDesiredSize);
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} else {
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// A different error message is triggered later for the other tags
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foundNoneTag = true;
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}
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}
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baseFrame = childFrame;
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GetReflowAndBoundingMetricsFor(baseFrame, baseSize, bmBase);
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if (tag != nsGkAtoms::msub_) {
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// Apply italics correction if there is the potential for a
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// postsupscript.
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GetItalicCorrection(bmBase, italicCorrection);
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// If italics correction is applied, we always add "a little to spare"
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// (see TeXbook Ch.11, p.64), as we estimate the italic creation
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// ourselves and it isn't the same as TeX.
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italicCorrection += onePixel;
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}
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// we update boundingMetrics.{ascent,descent} with that
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// of the baseFrame only after processing all the sup/sub pairs
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boundingMetrics.width = bmBase.width;
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boundingMetrics.rightBearing = bmBase.rightBearing;
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boundingMetrics.leftBearing = bmBase.leftBearing; // until overwritten
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} else {
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// super/subscript block
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if (childFrame->GetContent()->IsMathMLElement(nsGkAtoms::none)) {
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foundNoneTag = true;
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}
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if (isSubScript) {
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// subscript
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subScriptFrame = childFrame;
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GetReflowAndBoundingMetricsFor(subScriptFrame, subScriptSize,
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bmSubScript);
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if (!mathFont) {
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// get the subdrop from the subscript font
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GetSubDropFromChild(subScriptFrame, subDrop, aFontSizeInflation);
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}
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// parameter v, Rule 18a, App. G, TeXbook
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minSubScriptShift = bmBase.descent + subDrop;
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trySubScriptShift = std::max(minSubScriptShift, subScriptShift);
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multiSubSize.SetBlockStartAscent(std::max(
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multiSubSize.BlockStartAscent(), subScriptSize.BlockStartAscent()));
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bmMultiSub.ascent = std::max(bmMultiSub.ascent, bmSubScript.ascent);
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bmMultiSub.descent = std::max(bmMultiSub.descent, bmSubScript.descent);
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multiSubSize.Height() =
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std::max(multiSubSize.Height(),
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subScriptSize.Height() - subScriptSize.BlockStartAscent());
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if (bmSubScript.width) width = bmSubScript.width + scriptSpace;
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rightBearing = bmSubScript.rightBearing;
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if (tag == nsGkAtoms::msub_) {
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boundingMetrics.rightBearing = boundingMetrics.width + rightBearing;
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boundingMetrics.width += width;
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nscoord subscriptTopMax;
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if (mathFont) {
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subscriptTopMax = mathFont->MathTable()->Constant(
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gfxMathTable::SubscriptTopMax, oneDevPixel);
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} else {
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// get min subscript shift limit from x-height
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// = h(x) - 4/5 * sigma_5, Rule 18b, App. G, TeXbook
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subscriptTopMax = NSToCoordRound((4.0f / 5.0f) * xHeight);
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}
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nscoord minShiftFromXHeight = bmSubScript.ascent - subscriptTopMax;
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maxSubScriptShift = std::max(trySubScriptShift, minShiftFromXHeight);
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maxSubScriptShift = std::max(maxSubScriptShift, trySubScriptShift);
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trySubScriptShift = subScriptShift;
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}
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} else {
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// supscript
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supScriptFrame = childFrame;
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GetReflowAndBoundingMetricsFor(supScriptFrame, supScriptSize,
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bmSupScript);
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if (!mathFont) {
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// get the supdrop from the supscript font
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GetSupDropFromChild(supScriptFrame, supDrop, aFontSizeInflation);
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}
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// parameter u, Rule 18a, App. G, TeXbook
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minSupScriptShift = bmBase.ascent - supDrop;
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nscoord superscriptBottomMin;
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if (mathFont) {
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superscriptBottomMin = mathFont->MathTable()->Constant(
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gfxMathTable::SuperscriptBottomMin, oneDevPixel);
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} else {
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// get min supscript shift limit from x-height
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// = d(x) + 1/4 * sigma_5, Rule 18c, App. G, TeXbook
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superscriptBottomMin = NSToCoordRound((1.0f / 4.0f) * xHeight);
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}
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minShiftFromXHeight = bmSupScript.descent + superscriptBottomMin;
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trySupScriptShift = std::max(
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minSupScriptShift, std::max(minShiftFromXHeight, supScriptShift));
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multiSupSize.SetBlockStartAscent(std::max(
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multiSupSize.BlockStartAscent(), supScriptSize.BlockStartAscent()));
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bmMultiSup.ascent = std::max(bmMultiSup.ascent, bmSupScript.ascent);
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bmMultiSup.descent = std::max(bmMultiSup.descent, bmSupScript.descent);
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multiSupSize.Height() =
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std::max(multiSupSize.Height(),
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supScriptSize.Height() - supScriptSize.BlockStartAscent());
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|
|
|
if (bmSupScript.width)
|
|
width = std::max(width, bmSupScript.width + scriptSpace);
|
|
|
|
if (!prescriptsFrame) { // we are still looping over base & postscripts
|
|
rightBearing = std::max(rightBearing,
|
|
italicCorrection + bmSupScript.rightBearing);
|
|
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) -
|
|
(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);
|
|
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 ||
|
|
(foundNoneTag && tag != nsGkAtoms::mmultiscripts_) ||
|
|
(!isSubScript && tag == nsGkAtoms::mmultiscripts_)) {
|
|
// report an error, encourage people to get their markups in order
|
|
if (aPlaceOrigin) {
|
|
if ((count != 2 &&
|
|
(tag == nsGkAtoms::msup_ || tag == nsGkAtoms::msub_)) ||
|
|
(count != 3 && tag == nsGkAtoms::msubsup_)) {
|
|
aFrame->ReportChildCountError();
|
|
} else if (foundNoneTag && tag != nsGkAtoms::mmultiscripts_) {
|
|
aFrame->ReportInvalidChildError(nsGkAtoms::none);
|
|
} else if (!baseFrame) {
|
|
aFrame->ReportErrorToConsole("NoBase");
|
|
} else {
|
|
aFrame->ReportErrorToConsole("SubSupMismatch");
|
|
}
|
|
}
|
|
return aFrame->ReflowError(aDrawTarget, 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, bmMultiSub.ascent - maxSubScriptShift);
|
|
} else {
|
|
boundingMetrics.ascent =
|
|
std::max(bmBase.ascent, (bmMultiSup.ascent + maxSupScriptShift));
|
|
}
|
|
if (tag == nsGkAtoms::msup_) {
|
|
boundingMetrics.descent =
|
|
std::max(bmBase.descent, bmMultiSup.descent - maxSupScriptShift);
|
|
} else {
|
|
boundingMetrics.descent =
|
|
std::max(bmBase.descent, (bmMultiSub.descent + maxSubScriptShift));
|
|
}
|
|
aFrame->SetBoundingMetrics(boundingMetrics);
|
|
|
|
// get the reflow metrics ...
|
|
aDesiredSize.SetBlockStartAscent(
|
|
std::max(baseSize.BlockStartAscent(),
|
|
std::max(multiSubSize.BlockStartAscent() - maxSubScriptShift,
|
|
multiSupSize.BlockStartAscent() + maxSupScriptShift)));
|
|
aDesiredSize.Height() =
|
|
aDesiredSize.BlockStartAscent() +
|
|
std::max(baseSize.Height() - baseSize.BlockStartAscent(),
|
|
std::max(multiSubSize.Height() + maxSubScriptShift,
|
|
multiSupSize.Height() - maxSupScriptShift));
|
|
aDesiredSize.Width() = boundingMetrics.width;
|
|
aDesiredSize.mBoundingMetrics = 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 (aPlaceOrigin) {
|
|
nscoord dx = 0, 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();
|
|
FinishReflowChild(
|
|
baseFrame, aPresContext, baseSize, nullptr,
|
|
aFrame->MirrorIfRTL(aDesiredSize.Width(), baseSize.Width(), dx), dy,
|
|
0);
|
|
dx += bmBase.width;
|
|
} else if (prescriptsFrame == childFrame) {
|
|
// Clear reflow flags of prescripts frame.
|
|
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);
|
|
if (supScriptFrame)
|
|
GetReflowAndBoundingMetricsFor(supScriptFrame, supScriptSize,
|
|
bmSupScript);
|
|
|
|
width = std::max(subScriptSize.Width(), supScriptSize.Width());
|
|
|
|
if (subScriptFrame) {
|
|
nscoord x = dx;
|
|
// prescripts should be right aligned
|
|
// https://bugzilla.mozilla.org/show_bug.cgi?id=928675
|
|
if (isPreScript) x += width - subScriptSize.Width();
|
|
dy = aDesiredSize.BlockStartAscent() -
|
|
subScriptSize.BlockStartAscent() + maxSubScriptShift;
|
|
FinishReflowChild(subScriptFrame, aPresContext, subScriptSize,
|
|
nullptr,
|
|
aFrame->MirrorIfRTL(aDesiredSize.Width(),
|
|
subScriptSize.Width(), x),
|
|
dy, 0);
|
|
}
|
|
|
|
if (supScriptFrame) {
|
|
nscoord x = dx;
|
|
if (isPreScript) {
|
|
x += width - supScriptSize.Width();
|
|
} 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, 0);
|
|
}
|
|
dx += width + scriptSpace;
|
|
}
|
|
}
|
|
childFrame = childFrame->GetNextSibling();
|
|
} while (prescriptsFrame != childFrame);
|
|
}
|
|
|
|
return NS_OK;
|
|
}
|