adbcc9920a
FrameLayerBuilder requires the the (frame,per-frame-key) for each display item is unique. It only enforces this in certain situations though, so there's cases where we've gotten away without this. Retained display lists introduces more situations where we rely on this, so I've found a few. MathML nsDisplayNotation and nsDisplayMathMLBar are the two fixed by this patch.
383 lines
12 KiB
C++
383 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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uint32_t aIndex = 0);
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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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