382 lines
12 KiB
C++
382 lines
12 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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#ifndef nsMathMLFrame_h___
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#define nsMathMLFrame_h___
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#include "mozilla/Attributes.h"
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#include "nsFontMetrics.h"
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#include "nsMathMLOperators.h"
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#include "nsIMathMLFrame.h"
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#include "nsLayoutUtils.h"
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#include "nsBoundingMetrics.h"
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#include "nsIFrame.h"
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class nsMathMLChar;
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class nsCSSValue;
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class nsDisplayListSet;
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// Concrete base class with default methods that derived MathML frames can override
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class nsMathMLFrame : public nsIMathMLFrame {
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public:
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// nsIMathMLFrame ---
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virtual bool
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IsSpaceLike() override {
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return NS_MATHML_IS_SPACE_LIKE(mPresentationData.flags);
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}
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NS_IMETHOD
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GetBoundingMetrics(nsBoundingMetrics& aBoundingMetrics) override {
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aBoundingMetrics = mBoundingMetrics;
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return NS_OK;
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}
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NS_IMETHOD
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SetBoundingMetrics(const nsBoundingMetrics& aBoundingMetrics) override {
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mBoundingMetrics = aBoundingMetrics;
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return NS_OK;
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}
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NS_IMETHOD
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SetReference(const nsPoint& aReference) override {
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mReference = aReference;
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return NS_OK;
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}
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virtual eMathMLFrameType GetMathMLFrameType() override;
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NS_IMETHOD
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Stretch(mozilla::gfx::DrawTarget* aDrawTarget,
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nsStretchDirection aStretchDirection,
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nsBoundingMetrics& aContainerSize,
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mozilla::ReflowOutput& aDesiredStretchSize) override
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{
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return NS_OK;
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}
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NS_IMETHOD
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GetEmbellishData(nsEmbellishData& aEmbellishData) override {
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aEmbellishData = mEmbellishData;
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return NS_OK;
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}
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NS_IMETHOD
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GetPresentationData(nsPresentationData& aPresentationData) override {
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aPresentationData = mPresentationData;
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return NS_OK;
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}
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NS_IMETHOD
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InheritAutomaticData(nsIFrame* aParent) override;
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NS_IMETHOD
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TransmitAutomaticData() override
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{
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return NS_OK;
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}
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NS_IMETHOD
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UpdatePresentationData(uint32_t aFlagsValues,
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uint32_t aFlagsToUpdate) override;
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NS_IMETHOD
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UpdatePresentationDataFromChildAt(int32_t aFirstIndex,
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int32_t aLastIndex,
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uint32_t aFlagsValues,
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uint32_t aFlagsToUpdate) override
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{
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return NS_OK;
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}
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uint8_t
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ScriptIncrement(nsIFrame* aFrame) override
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{
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return 0;
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}
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bool
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IsMrowLike() override
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{
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return false;
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}
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// helper to give a style context suitable for doing the stretching to the
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// MathMLChar. Frame classes that use this should make the extra style contexts
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// accessible to the Style System via Get/Set AdditionalStyleContext.
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static void
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ResolveMathMLCharStyle(nsPresContext* aPresContext,
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nsIContent* aContent,
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nsStyleContext* aParenStyleContext,
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nsMathMLChar* aMathMLChar);
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// helper to get the mEmbellishData of a frame
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// The MathML REC precisely defines an "embellished operator" as:
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// - an <mo> element;
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// - or one of the elements <msub>, <msup>, <msubsup>, <munder>, <mover>,
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// <munderover>, <mmultiscripts>, <mfrac>, or <semantics>, whose first
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// argument exists and is an embellished operator;
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//- or one of the elements <mstyle>, <mphantom>, or <mpadded>, such that
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// an <mrow> containing the same arguments would be an embellished
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// operator;
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// - or an <maction> element whose selected subexpression exists and is an
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// embellished operator;
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// - or an <mrow> whose arguments consist (in any order) of one embellished
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// operator and zero or more spacelike elements.
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static void
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GetEmbellishDataFrom(nsIFrame* aFrame,
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nsEmbellishData& aEmbellishData);
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// helper to get the presentation data of a frame. If aClimbTree is
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// set to true and the frame happens to be surrounded by non-MathML
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// helper frames needed for its support, we walk up the frame hierarchy
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// until we reach a MathML ancestor or the <root> math element.
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static void
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GetPresentationDataFrom(nsIFrame* aFrame,
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nsPresentationData& aPresentationData,
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bool aClimbTree = true);
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// utilities to parse and retrieve numeric values in CSS units
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// All values are stored in twips.
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// @pre aLengthValue is the default length value of the attribute.
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// @post aLengthValue is the length value computed from the attribute.
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static void ParseNumericValue(const nsString& aString,
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nscoord* aLengthValue,
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uint32_t aFlags,
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nsPresContext* aPresContext,
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nsStyleContext* aStyleContext,
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float aFontSizeInflation);
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static nscoord
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CalcLength(nsPresContext* aPresContext,
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nsStyleContext* aStyleContext,
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const nsCSSValue& aCSSValue,
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float aFontSizeInflation);
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static eMathMLFrameType
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GetMathMLFrameTypeFor(nsIFrame* aFrame)
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{
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if (aFrame->IsFrameOfType(nsIFrame::eMathML)) {
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nsIMathMLFrame* mathMLFrame = do_QueryFrame(aFrame);
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if (mathMLFrame)
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return mathMLFrame->GetMathMLFrameType();
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}
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return eMathMLFrameType_UNKNOWN;
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}
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// estimate of the italic correction
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static void
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GetItalicCorrection(nsBoundingMetrics& aBoundingMetrics,
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nscoord& aItalicCorrection)
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{
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aItalicCorrection = aBoundingMetrics.rightBearing - aBoundingMetrics.width;
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if (0 > aItalicCorrection) {
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aItalicCorrection = 0;
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}
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}
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static void
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GetItalicCorrection(nsBoundingMetrics& aBoundingMetrics,
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nscoord& aLeftItalicCorrection,
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nscoord& aRightItalicCorrection)
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{
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aRightItalicCorrection = aBoundingMetrics.rightBearing - aBoundingMetrics.width;
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if (0 > aRightItalicCorrection) {
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aRightItalicCorrection = 0;
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}
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aLeftItalicCorrection = -aBoundingMetrics.leftBearing;
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if (0 > aLeftItalicCorrection) {
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aLeftItalicCorrection = 0;
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}
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}
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// helper methods for getting sup/subdrop's from a child
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static void
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GetSubDropFromChild(nsIFrame* aChild,
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nscoord& aSubDrop,
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float aFontSizeInflation)
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{
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RefPtr<nsFontMetrics> fm =
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nsLayoutUtils::GetFontMetricsForFrame(aChild, aFontSizeInflation);
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GetSubDrop(fm, aSubDrop);
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}
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static void
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GetSupDropFromChild(nsIFrame* aChild,
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nscoord& aSupDrop,
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float aFontSizeInflation)
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{
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RefPtr<nsFontMetrics> fm =
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nsLayoutUtils::GetFontMetricsForFrame(aChild, aFontSizeInflation);
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GetSupDrop(fm, aSupDrop);
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}
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static void
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GetSkewCorrectionFromChild(nsIFrame* aChild,
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nscoord& aSkewCorrection)
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{
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// default is 0
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// individual classes should over-ride this method if necessary
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aSkewCorrection = 0;
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}
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// 2 levels of subscript shifts
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static void
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GetSubScriptShifts(nsFontMetrics* fm,
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nscoord& aSubScriptShift1,
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nscoord& aSubScriptShift2)
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{
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nscoord xHeight = fm->XHeight();
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aSubScriptShift1 = NSToCoordRound(150.000f/430.556f * xHeight);
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aSubScriptShift2 = NSToCoordRound(247.217f/430.556f * xHeight);
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}
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// 3 levels of superscript shifts
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static void
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GetSupScriptShifts(nsFontMetrics* fm,
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nscoord& aSupScriptShift1,
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nscoord& aSupScriptShift2,
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nscoord& aSupScriptShift3)
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{
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nscoord xHeight = fm->XHeight();
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aSupScriptShift1 = NSToCoordRound(412.892f/430.556f * xHeight);
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aSupScriptShift2 = NSToCoordRound(362.892f/430.556f * xHeight);
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aSupScriptShift3 = NSToCoordRound(288.889f/430.556f * xHeight);
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}
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// these are TeX specific params not found in ordinary fonts
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static void
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GetSubDrop(nsFontMetrics* fm,
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nscoord& aSubDrop)
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{
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nscoord xHeight = fm->XHeight();
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aSubDrop = NSToCoordRound(50.000f/430.556f * xHeight);
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}
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static void
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GetSupDrop(nsFontMetrics* fm,
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nscoord& aSupDrop)
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{
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nscoord xHeight = fm->XHeight();
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aSupDrop = NSToCoordRound(386.108f/430.556f * xHeight);
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}
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static void
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GetNumeratorShifts(nsFontMetrics* fm,
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nscoord& numShift1,
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nscoord& numShift2,
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nscoord& numShift3)
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{
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nscoord xHeight = fm->XHeight();
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numShift1 = NSToCoordRound(676.508f/430.556f * xHeight);
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numShift2 = NSToCoordRound(393.732f/430.556f * xHeight);
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numShift3 = NSToCoordRound(443.731f/430.556f * xHeight);
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}
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static void
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GetDenominatorShifts(nsFontMetrics* fm,
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nscoord& denShift1,
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nscoord& denShift2)
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{
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nscoord xHeight = fm->XHeight();
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denShift1 = NSToCoordRound(685.951f/430.556f * xHeight);
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denShift2 = NSToCoordRound(344.841f/430.556f * xHeight);
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}
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static void
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GetEmHeight(nsFontMetrics* fm,
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nscoord& emHeight)
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{
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#if 0
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// should switch to this API in order to scale with changes of TextZoom
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emHeight = fm->EmHeight();
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#else
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emHeight = NSToCoordRound(float(fm->Font().size));
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#endif
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}
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static void
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GetAxisHeight (nsFontMetrics* fm,
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nscoord& axisHeight)
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{
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axisHeight = NSToCoordRound(250.000f/430.556f * fm->XHeight());
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}
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static void
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GetBigOpSpacings(nsFontMetrics* fm,
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nscoord& bigOpSpacing1,
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nscoord& bigOpSpacing2,
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nscoord& bigOpSpacing3,
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nscoord& bigOpSpacing4,
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nscoord& bigOpSpacing5)
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{
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nscoord xHeight = fm->XHeight();
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bigOpSpacing1 = NSToCoordRound(111.111f/430.556f * xHeight);
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bigOpSpacing2 = NSToCoordRound(166.667f/430.556f * xHeight);
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bigOpSpacing3 = NSToCoordRound(200.000f/430.556f * xHeight);
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bigOpSpacing4 = NSToCoordRound(600.000f/430.556f * xHeight);
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bigOpSpacing5 = NSToCoordRound(100.000f/430.556f * xHeight);
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}
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static void
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GetRuleThickness(nsFontMetrics* fm,
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nscoord& ruleThickness)
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{
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nscoord xHeight = fm->XHeight();
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ruleThickness = NSToCoordRound(40.000f/430.556f * xHeight);
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}
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// Some parameters are not accurately obtained using the x-height.
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// Here are some slower variants to obtain the desired metrics
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// by actually measuring some characters
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static void
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GetRuleThickness(mozilla::gfx::DrawTarget* aDrawTarget,
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nsFontMetrics* aFontMetrics,
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nscoord& aRuleThickness);
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static void
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GetAxisHeight(mozilla::gfx::DrawTarget* aDrawTarget,
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nsFontMetrics* aFontMetrics,
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nscoord& aAxisHeight);
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static void
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GetRadicalParameters(nsFontMetrics* aFontMetrics,
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bool aDisplayStyle,
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nscoord& aRadicalRuleThickness,
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nscoord& aRadicalExtraAscender,
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nscoord& aRadicalVerticalGap);
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protected:
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#if defined(DEBUG) && defined(SHOW_BOUNDING_BOX)
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void DisplayBoundingMetrics(nsDisplayListBuilder* aBuilder,
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nsIFrame* aFrame, const nsPoint& aPt,
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const nsBoundingMetrics& aMetrics,
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const nsDisplayListSet& aLists);
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#endif
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/**
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* Display a solid rectangle in the frame's text color. Used for drawing
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* fraction separators and root/sqrt overbars.
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*/
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void DisplayBar(nsDisplayListBuilder* aBuilder,
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nsIFrame* aFrame, const nsRect& aRect,
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const nsDisplayListSet& aLists);
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// information about the presentation policy of the frame
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nsPresentationData mPresentationData;
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// information about a container that is an embellished operator
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nsEmbellishData mEmbellishData;
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// Metrics that _exactly_ enclose the text of the frame
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nsBoundingMetrics mBoundingMetrics;
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// Reference point of the frame: mReference.y is the baseline
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nsPoint mReference;
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};
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#endif /* nsMathMLFrame_h___ */
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