зеркало из https://github.com/mozilla/gecko-dev.git
614 строки
23 KiB
C++
614 строки
23 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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 "nsRenderingContext.h"
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#include <algorithm>
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//
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// <mmultiscripts> -- attach prescripts and tensor indices to a base - implementation
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// <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*
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NS_NewMathMLmmultiscriptsFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
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{
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return new (aPresShell) nsMathMLmmultiscriptsFrame(aContext);
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}
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NS_IMPL_FRAMEARENA_HELPERS(nsMathMLmmultiscriptsFrame)
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nsMathMLmmultiscriptsFrame::~nsMathMLmmultiscriptsFrame()
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{
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}
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NS_IMETHODIMP
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nsMathMLmmultiscriptsFrame::TransmitAutomaticData()
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{
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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 REC says:
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// The script element increments scriptlevel by 1, and sets
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// displaystyle to "false", within each of its arguments except base
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UpdatePresentationDataFromChildAt(1, -1,
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~NS_MATHML_DISPLAYSTYLE, NS_MATHML_DISPLAYSTYLE);
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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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if (mContent->Tag() == nsGkAtoms::msup_)
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return NS_OK;
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int32_t count = 0;
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bool isSubScript = true;
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nsAutoTArray<nsIFrame*, 8> subScriptFrames;
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nsIFrame* childFrame = mFrames.FirstChild();
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while (childFrame) {
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if (childFrame->GetContent()->Tag() == 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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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,
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NS_MATHML_COMPRESSED, NS_MATHML_COMPRESSED);
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}
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return NS_OK;
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}
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/* virtual */ nsresult
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nsMathMLmmultiscriptsFrame::Place(nsRenderingContext& aRenderingContext,
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bool aPlaceOrigin,
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nsHTMLReflowMetrics& aDesiredSize)
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{
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nscoord subScriptShift = 0;
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nscoord supScriptShift = 0;
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nsIAtom* tag = mContent->Tag();
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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 (tag != nsGkAtoms::msup_) {
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GetAttribute(mContent, mPresentationData.mstyle,
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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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mStyleContext);
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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 (tag != nsGkAtoms::msub_) {
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GetAttribute(mContent, mPresentationData.mstyle,
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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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mStyleContext);
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}
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}
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// scriptspace from TeX for extra spacing after sup/subscript
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// (0.5pt in plain TeX)
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nscoord scriptSpace = nsPresContext::CSSPointsToAppUnits(0.5f);
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return PlaceMultiScript(PresContext(), aRenderingContext, aPlaceOrigin,
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aDesiredSize, this, subScriptShift, supScriptShift,
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scriptSpace);
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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
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nsMathMLmmultiscriptsFrame::PlaceMultiScript(nsPresContext* aPresContext,
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nsRenderingContext& aRenderingContext,
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bool aPlaceOrigin,
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nsHTMLReflowMetrics& aDesiredSize,
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nsMathMLContainerFrame* aFrame,
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nscoord aUserSubScriptShift,
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nscoord aUserSupScriptShift,
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nscoord aScriptSpace)
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{
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nsIAtom* tag = aFrame->GetContent()->Tag();
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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 (tag == nsGkAtoms::mover_)
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tag = nsGkAtoms::msup_;
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else if (tag == nsGkAtoms::munder_)
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tag = nsGkAtoms::msub_;
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else if (tag == nsGkAtoms::munderover_)
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tag = nsGkAtoms::msubsup_;
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nsBoundingMetrics bmFrame;
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nsHTMLReflowMetrics frameSize;
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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->GetFirstPrincipalChild();
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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(aRenderingContext, 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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nsRefPtr<nsFontMetrics> fm;
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nsLayoutUtils::GetFontMetricsForFrame(baseFrame, getter_AddRefs(fm));
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aRenderingContext.SetFont(fm);
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nscoord xHeight = fm->XHeight();
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nscoord ruleSize;
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GetRuleThickness (aRenderingContext, fm, ruleSize);
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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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aScriptSpace = std::max(onePixel, aScriptSpace);
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/////////////////////////////////////
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// first the shift for the subscript
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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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nscoord subScriptShift;
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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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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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// 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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nsPresentationData presentationData;
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aFrame->GetPresentationData(presentationData);
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nscoord supScriptShift;
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if ( font->mScriptLevel == 0 &&
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NS_MATHML_IS_DISPLAYSTYLE(presentationData.flags) &&
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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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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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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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nsHTMLReflowMetrics baseSize;
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nsHTMLReflowMetrics subScriptSize;
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nsHTMLReflowMetrics supScriptSize;
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nsHTMLReflowMetrics multiSubSize, multiSupSize;
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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.ascent = multiSupSize.ascent = -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->GetFirstPrincipalChild();
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while (childFrame) {
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nsIAtom* childTag = childFrame->GetContent()->Tag();
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if (childTag == nsGkAtoms::mprescripts_) {
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if (tag != nsGkAtoms::mmultiscripts_) {
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if (aPlaceOrigin) {
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aFrame->ReportInvalidChildError(childTag);
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}
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return aFrame->ReflowError(aRenderingContext, 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(aRenderingContext, 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(aRenderingContext, 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 (childTag == 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(aRenderingContext, 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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// XXX need italic correction only *if* there are postscripts ?
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boundingMetrics.width = bmBase.width + italicCorrection;
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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 ( childTag == 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, bmSubScript);
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// get the subdrop from the subscript font
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GetSubDropFromChild (subScriptFrame, subDrop);
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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.ascent = std::max(multiSubSize.ascent,
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subScriptSize.ascent);
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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.ascent);
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if (bmSubScript.width)
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width = bmSubScript.width + aScriptSpace;
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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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// 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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nscoord minShiftFromXHeight = (nscoord)
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(bmSubScript.ascent - (4.0f/5.0f) * xHeight);
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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, bmSupScript);
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// get the supdrop from the supscript font
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GetSupDropFromChild (supScriptFrame, supDrop);
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// parameter u, Rule 18a, App. G, TeXbook
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minSupScriptShift = bmBase.ascent - supDrop;
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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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minShiftFromXHeight = NSToCoordRound
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((bmSupScript.descent + (1.0f/4.0f) * xHeight));
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trySupScriptShift = std::max(minSupScriptShift,
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std::max(minShiftFromXHeight,
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supScriptShift));
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multiSupSize.ascent = std::max(multiSupSize.ascent,
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supScriptSize.ascent);
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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.ascent);
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if (bmSupScript.width)
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width = std::max(width, bmSupScript.width + aScriptSpace);
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rightBearing = std::max(rightBearing, bmSupScript.rightBearing);
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if (!prescriptsFrame) { // we are still looping over base & postscripts
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boundingMetrics.rightBearing = boundingMetrics.width + rightBearing;
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boundingMetrics.width += width;
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} else {
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prescriptsWidth += width;
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if (firstPrescriptsPair) {
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firstPrescriptsPair = false;
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boundingMetrics.leftBearing =
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std::min(bmSubScript.leftBearing, bmSupScript.leftBearing);
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}
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}
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width = rightBearing = 0;
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// negotiate between the various shifts so that
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// there is enough gap between the sup and subscripts
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// Rule 18e, App. G, TeXbook
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if (tag == nsGkAtoms::mmultiscripts_ ||
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tag == nsGkAtoms::msubsup_) {
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nscoord gap =
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(trySupScriptShift - bmSupScript.descent) -
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(bmSubScript.ascent - trySubScriptShift);
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if (gap < 4.0f * ruleSize) {
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// adjust trySubScriptShift to get a gap of (4.0 * ruleSize)
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trySubScriptShift += NSToCoordRound ((4.0f * ruleSize) - gap);
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}
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// next we want to ensure that the bottom of the superscript
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// will be > (4/5) * x-height above baseline
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gap = NSToCoordRound ((4.0f/5.0f) * xHeight -
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(trySupScriptShift - bmSupScript.descent));
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if (gap > 0) {
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trySupScriptShift += gap;
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trySubScriptShift -= gap;
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}
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}
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maxSubScriptShift = std::max(maxSubScriptShift, trySubScriptShift);
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maxSupScriptShift = std::max(maxSupScriptShift, trySupScriptShift);
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trySubScriptShift = subScriptShift;
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trySupScriptShift = supScriptShift;
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}
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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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//NoBase error may also have been reported above
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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(aRenderingContext, 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.ascent =
|
|
std::max(baseSize.ascent,
|
|
std::max(multiSubSize.ascent - maxSubScriptShift,
|
|
multiSupSize.ascent + maxSupScriptShift));
|
|
aDesiredSize.height = aDesiredSize.ascent +
|
|
std::max(baseSize.height - baseSize.ascent,
|
|
std::max(multiSubSize.height + maxSubScriptShift,
|
|
multiSupSize.height - maxSupScriptShift));
|
|
aDesiredSize.width = boundingMetrics.width;
|
|
aDesiredSize.mBoundingMetrics = boundingMetrics;
|
|
|
|
aFrame->SetReference(nsPoint(0, aDesiredSize.ascent));
|
|
|
|
//////////////////
|
|
// 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;
|
|
do {
|
|
if (!childFrame) { // end of prescripts,
|
|
// place the base ...
|
|
childFrame = baseFrame;
|
|
dy = aDesiredSize.ascent - baseSize.ascent;
|
|
FinishReflowChild (baseFrame, aPresContext, nullptr, baseSize,
|
|
aFrame->MirrorIfRTL(aDesiredSize.width,
|
|
baseSize.width,
|
|
dx),
|
|
dy, 0);
|
|
dx += bmBase.width + italicCorrection;
|
|
} else if (prescriptsFrame != childFrame) {
|
|
// 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);
|
|
|
|
// center w.r.t. largest width
|
|
width = std::max(subScriptSize.width, supScriptSize.width);
|
|
|
|
if (subScriptFrame) {
|
|
dy = aDesiredSize.ascent - subScriptSize.ascent +
|
|
maxSubScriptShift;
|
|
FinishReflowChild (subScriptFrame, aPresContext, nullptr,
|
|
subScriptSize,
|
|
aFrame->MirrorIfRTL(aDesiredSize.width,
|
|
subScriptSize.width,
|
|
dx + (width-subScriptSize.width)/2),
|
|
dy, 0);
|
|
}
|
|
|
|
if (supScriptFrame) {
|
|
dy = aDesiredSize.ascent - supScriptSize.ascent -
|
|
maxSupScriptShift;
|
|
FinishReflowChild (supScriptFrame, aPresContext, nullptr,
|
|
supScriptSize,
|
|
aFrame->MirrorIfRTL(aDesiredSize.width,
|
|
supScriptSize.width,
|
|
dx + (width-supScriptSize.width)/2),
|
|
dy, 0);
|
|
}
|
|
dx += width + aScriptSpace;
|
|
}
|
|
}
|
|
childFrame = childFrame->GetNextSibling();
|
|
} while (prescriptsFrame != childFrame);
|
|
}
|
|
|
|
return NS_OK;
|
|
}
|