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[not part of default build] Merged my tree with Shyjan changes, enabling the italic correction, the inter-frame spacing, and the support for moveablimits. Updated the returned bounding metrics to keep the bounding boxes aligned in the visual debug mode

This commit is contained in:
rbs%maths.uq.edu.au 2001-02-02 09:37:14 +00:00
Родитель f728161357
Коммит b3ad0ab2a8
13 изменённых файлов: 685 добавлений и 2240 удалений
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1862
layout/mathml/base/src/nsMathMLContainerFrame.cpp
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29
layout/mathml/base/src/nsMathMLContainerFrame.h
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@ -117,18 +117,22 @@ public:
SetPresentationData(const nsPresentationData& aPresentationData);
NS_IMETHOD
UpdatePresentationData(PRInt32 aScriptLevelIncrement,
PRBool aDisplayStyle,
PRBool aCompressed);
UpdatePresentationData(PRInt32 aScriptLevelIncrement,
PRUint32 aFlagsValues,
PRUint32 aFlagsToUpdate);
NS_IMETHOD
UpdatePresentationDataFromChildAt(PRInt32 aIndex,
PRInt32 aScriptLevelIncrement,
PRBool aDisplayStyle,
PRBool aCompressed);
UpdatePresentationDataFromChildAt(PRInt32 aFirstIndex,
PRInt32 aLastIndex,
PRInt32 aScriptLevelIncrement,
PRUint32 aFlagsValues,
PRUint32 aFlagsToUpdate);
// nsHTMLContainerFrame methods
NS_IMETHOD
GetFrameType(nsIAtom** aType) const;
NS_IMETHOD
Init(nsIPresContext* aPresContext,
nsIContent* aContent,
@ -289,6 +293,17 @@ public:
nsString& aString,
nsCSSValue& aCSSValue);
// estimate of the italic correction
static void
GetItalicCorrection(nsBoundingMetrics& aBoundingMetrics,
nscoord& aItalicCorrection)
{
aItalicCorrection = aBoundingMetrics.rightBearing - aBoundingMetrics.width;
if (0 > aItalicCorrection) {
aItalicCorrection = 0;
}
}
// helper methods for getting sup/subdrop's from a child
static void
GetSubDropFromChild (nsIPresContext* aPresContext,

219
layout/mathml/base/src/nsMathMLmmultiscriptsFrame.cpp
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@ -69,10 +69,10 @@ nsMathMLmmultiscriptsFrame::~nsMathMLmmultiscriptsFrame()
NS_IMETHODIMP
nsMathMLmmultiscriptsFrame::Init(nsIPresContext* aPresContext,
nsIContent* aContent,
nsIFrame* aParent,
nsIStyleContext* aContext,
nsIFrame* aPrevInFlow)
nsIContent* aContent,
nsIFrame* aParent,
nsIStyleContext* aContext,
nsIFrame* aPrevInFlow)
{
nsresult rv = nsMathMLContainerFrame::Init
(aPresContext, aContent, aParent, aContext, aPrevInFlow);
@ -228,6 +228,7 @@ nsMathMLmmultiscriptsFrame::Place(nsIPresContext* aPresContext,
PRBool firstPrescriptsPair = PR_FALSE;
nsBoundingMetrics bmBase, bmSubScript, bmSupScript;
nscoord italicCorrection = 0;
// XXX is there an NSPR macro for int_max ???
mBoundingMetrics.ascent = mBoundingMetrics.descent = -10000000;
@ -251,75 +252,76 @@ nsMathMLmmultiscriptsFrame::Place(nsIPresContext* aPresContext,
}
else {
if (childTag.get() == nsMathMLAtoms::none_) {
// we need to record the presence of none tag explicitly
// for correct negotiation between sup/sub shifts later
if (isSubScript) {
isSubScriptPresent = PR_FALSE;
if (childTag.get() == nsMathMLAtoms::none_) {
// we need to record the presence of none tag explicitly
// for correct negotiation between sup/sub shifts later
if (isSubScript) {
isSubScriptPresent = PR_FALSE;
bmSubScript.Clear();
bmSubScript.leftBearing = 10000000;
}
else {
isSupScriptPresent = PR_FALSE;
}
else {
isSupScriptPresent = PR_FALSE;
bmSupScript.Clear();
bmSupScript.leftBearing = 10000000;
}
}
}
}
if (0 == count) {
// base
baseFrame = aChildFrame;
// base
baseFrame = aChildFrame;
GetReflowAndBoundingMetricsFor(baseFrame, baseSize, bmBase);
GetItalicCorrection(bmBase, italicCorrection);
// we update mBoundingMetrics.{ascent,descent} with that
// of the baseFrame only after processing all the sup/sub pairs
// we update mBoundingMetrics.{ascent,descent} with that
// of the baseFrame only after processing all the sup/sub pairs
// XXX need italic correction only *if* there are postscripts ?
mBoundingMetrics.width = bmBase.width + bmBase.supItalicCorrection;
mBoundingMetrics.rightBearing = bmBase.rightBearing;
mBoundingMetrics.width = bmBase.width + italicCorrection;
mBoundingMetrics.rightBearing = bmBase.rightBearing;
mBoundingMetrics.leftBearing = bmBase.leftBearing; // until overwritten
}
}
else {
// super/subscript block
if (isSubScript) {
if (isSubScriptPresent) {
// subscript
subScriptFrame = aChildFrame;
// super/subscript block
if (isSubScript) {
if (isSubScriptPresent) {
// subscript
subScriptFrame = aChildFrame;
GetReflowAndBoundingMetricsFor(subScriptFrame, subScriptSize, bmSubScript);
// get the subdrop from the subscript font
GetSubDropFromChild (aPresContext, subScriptFrame, aSubDrop);
// parameter v, Rule 18a, App. G, TeXbook
minSubScriptShift = bmBase.descent + aSubDrop;
trySubScriptShift = PR_MAX(minSubScriptShift,aSubScriptShift);
mBoundingMetrics.descent =
PR_MAX(mBoundingMetrics.descent,bmSubScript.descent);
aDesiredSize.descent =
PR_MAX(aDesiredSize.descent,subScriptSize.ascent);
// get the subdrop from the subscript font
GetSubDropFromChild (aPresContext, subScriptFrame, aSubDrop);
// parameter v, Rule 18a, App. G, TeXbook
minSubScriptShift = bmBase.descent + aSubDrop;
trySubScriptShift = PR_MAX(minSubScriptShift,aSubScriptShift);
mBoundingMetrics.descent =
PR_MAX(mBoundingMetrics.descent,bmSubScript.descent);
aDesiredSize.descent =
PR_MAX(aDesiredSize.descent,subScriptSize.descent);
width = bmSubScript.width + mScriptSpace;
rightBearing = bmSubScript.rightBearing + mScriptSpace;
}
}
else {
if (isSupScriptPresent) {
// supscript
supScriptFrame = aChildFrame;
}
}
else {
if (isSupScriptPresent) {
// supscript
supScriptFrame = aChildFrame;
GetReflowAndBoundingMetricsFor(supScriptFrame, supScriptSize, bmSupScript);
// get the supdrop from the supscript font
GetSupDropFromChild (aPresContext, supScriptFrame, aSupDrop);
// parameter u, Rule 18a, App. G, TeXbook
minSupScriptShift = bmBase.ascent - aSupDrop;
// get min supscript shift limit from x-height
// = d(x) + 1/4 * sigma_5, Rule 18c, App. G, TeXbook
minShiftFromXHeight = NSToCoordRound
((bmSupScript.descent + (1.0f/4.0f) * xHeight));
trySupScriptShift =
PR_MAX(minSupScriptShift,PR_MAX(minShiftFromXHeight,aSupScriptShift));
mBoundingMetrics.ascent =
PR_MAX(mBoundingMetrics.ascent,bmSupScript.ascent);
aDesiredSize.ascent =
PR_MAX(aDesiredSize.ascent,supScriptSize.ascent);
width = PR_MAX(width, bmSupScript.width + mScriptSpace);
rightBearing = PR_MAX(rightBearing, bmSupScript.rightBearing + mScriptSpace);
}
// get the supdrop from the supscript font
GetSupDropFromChild (aPresContext, supScriptFrame, aSupDrop);
// parameter u, Rule 18a, App. G, TeXbook
minSupScriptShift = bmBase.ascent - aSupDrop;
// get min supscript shift limit from x-height
// = d(x) + 1/4 * sigma_5, Rule 18c, App. G, TeXbook
minShiftFromXHeight = NSToCoordRound
((bmSupScript.descent + (1.0f/4.0f) * xHeight));
trySupScriptShift =
PR_MAX(minSupScriptShift,PR_MAX(minShiftFromXHeight,aSupScriptShift));
mBoundingMetrics.ascent =
PR_MAX(mBoundingMetrics.ascent,bmSupScript.ascent);
aDesiredSize.ascent =
PR_MAX(aDesiredSize.ascent,supScriptSize.ascent);
width = PR_MAX(width, bmSupScript.width + mScriptSpace);
rightBearing = PR_MAX(rightBearing, bmSupScript.rightBearing + mScriptSpace);
}
if (!isSubScriptPresent && !isSupScriptPresent) {
// report an error, encourage people to get their markups in order
@ -328,21 +330,21 @@ nsMathMLmmultiscriptsFrame::Place(nsIPresContext* aPresContext,
if (!mprescriptsFrame) { // we are still looping over base & postscripts
mBoundingMetrics.rightBearing = mBoundingMetrics.width + rightBearing;
mBoundingMetrics.width += width;
mBoundingMetrics.width += width;
}
else {
prescriptsWidth += width;
if (firstPrescriptsPair) {
firstPrescriptsPair = PR_FALSE;
firstPrescriptsPair = PR_FALSE;
mBoundingMetrics.leftBearing =
PR_MIN(bmSubScript.leftBearing, bmSupScript.leftBearing);
}
}
width = rightBearing = 0;
width = rightBearing = 0;
if (isSubScriptPresent && isSupScriptPresent) {
// negotiate between the various shifts so that
// there is enough gap between the sup and subscripts
if (isSubScriptPresent && isSupScriptPresent) {
// negotiate between the various shifts so that
// there is enough gap between the sup and subscripts
// Rule 18e, App. G, TeXbook
nscoord gap =
(trySupScriptShift - bmSupScript.descent) -
@ -360,14 +362,14 @@ nsMathMLmmultiscriptsFrame::Place(nsIPresContext* aPresContext,
trySupScriptShift += gap;
trySubScriptShift -= gap;
}
}
maxSubScriptShift = PR_MAX(maxSubScriptShift, trySubScriptShift);
maxSupScriptShift = PR_MAX(maxSupScriptShift, trySupScriptShift);
}
maxSubScriptShift = PR_MAX(maxSubScriptShift, trySubScriptShift);
maxSupScriptShift = PR_MAX(maxSupScriptShift, trySupScriptShift);
trySubScriptShift = aSubScriptShift;
trySupScriptShift = aSupScriptShift;
isSubScriptPresent = PR_TRUE;
isSupScriptPresent = PR_TRUE;
trySubScriptShift = aSubScriptShift;
trySupScriptShift = aSupScriptShift;
isSubScriptPresent = PR_TRUE;
isSupScriptPresent = PR_TRUE;
}
}
@ -376,8 +378,7 @@ nsMathMLmmultiscriptsFrame::Place(nsIPresContext* aPresContext,
}
}
rv = aChildFrame->GetNextSibling(&aChildFrame);
NS_ASSERTION(NS_SUCCEEDED(rv),"failed to get next child");
aChildFrame->GetNextSibling(&aChildFrame);
}
// note: width=0 if all sup-sub pairs match correctly
if ((0 != width) || !baseFrame || !subScriptFrame || !supScriptFrame) {
@ -421,57 +422,49 @@ nsMathMLmmultiscriptsFrame::Place(nsIPresContext* aPresContext,
aChildFrame = mprescriptsFrame;
do {
if (nsnull == aChildFrame) { // end of prescripts,
// place the base ...
aChildFrame = baseFrame;
// place the base ...
aChildFrame = baseFrame;
dy = aDesiredSize.ascent - baseSize.ascent;
FinishReflowChild (baseFrame, aPresContext, baseSize, dx, dy, 0);
dx += baseSize.width + bmBase.supItalicCorrection;
dx += bmBase.width + mScriptSpace + italicCorrection;
}
else if (mprescriptsFrame != aChildFrame) {
// process each sup/sub pair
if (!IsOnlyWhitespace (aChildFrame)) {
if (0 == count) {
subScriptFrame = aChildFrame;
count++;
}
else if (1 == count) {
supScriptFrame = aChildFrame;
count = 0;
// get the ascent/descent of sup/subscripts stored in their rects
// rect.x = descent, rect.y = ascent
subScriptFrame->GetRect (aRect);
subScriptSize.ascent = aRect.y;
subScriptSize.width = aRect.width;
subScriptSize.height = aRect.height;
supScriptFrame->GetRect (aRect);
supScriptSize.ascent = aRect.y;
supScriptSize.width = aRect.width;
supScriptSize.height = aRect.height;
// process each sup/sub pair
if (!IsOnlyWhitespace (aChildFrame)) {
if (0 == count) {
subScriptFrame = aChildFrame;
count++;
}
else if (1 == count) {
supScriptFrame = aChildFrame;
count = 0;
// get the ascent/descent of sup/subscripts stored in their rects
// rect.x = descent, rect.y = ascent
GetReflowAndBoundingMetricsFor(subScriptFrame, subScriptSize, bmSubScript);
GetReflowAndBoundingMetricsFor(supScriptFrame, supScriptSize, bmSupScript);
// center w.r.t. largest width
width = PR_MAX(subScriptSize.width, supScriptSize.width);
width = PR_MAX(subScriptSize.width, supScriptSize.width);
dy = aDesiredSize.ascent -
subScriptSize.ascent +
maxSubScriptShift;
FinishReflowChild (subScriptFrame, aPresContext, subScriptSize,
dx + (width-subScriptSize.width)/2, dy, 0);
dy = aDesiredSize.ascent -
subScriptSize.ascent +
maxSubScriptShift;
FinishReflowChild (subScriptFrame, aPresContext, subScriptSize,
dx + (width-subScriptSize.width)/2, dy, 0);
dy = aDesiredSize.ascent -
supScriptSize.ascent -
maxSupScriptShift;
FinishReflowChild (supScriptFrame, aPresContext, supScriptSize,
dx + (width-supScriptSize.width)/2, dy, 0);
dy = aDesiredSize.ascent -
supScriptSize.ascent -
maxSupScriptShift;
FinishReflowChild (supScriptFrame, aPresContext, supScriptSize,
dx + (width-supScriptSize.width)/2, dy, 0);
dx += mScriptSpace + width;
}
}
dx += mScriptSpace + width;
}
}
}
rv = aChildFrame->GetNextSibling(&aChildFrame);
NS_ASSERTION(NS_SUCCEEDED(rv),"failed to get next child");
aChildFrame->GetNextSibling(&aChildFrame);
} while (mprescriptsFrame != aChildFrame);
}

8
layout/mathml/base/src/nsMathMLmmultiscriptsFrame.h
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@ -55,7 +55,13 @@ public:
{
nsresult rv;
rv = nsMathMLContainerFrame::SetInitialChildList(aPresContext, aListName, aChildList);
UpdatePresentationDataFromChildAt(1, 1, PR_FALSE, PR_FALSE);
// The REC says:
// The <mmultiscripts> element increments scriptlevel by 1, and sets
// displaystyle to "false", within each of its arguments except base, but
// leaves both attributes unchanged within base.
// XXX Need to update the compression flags in the sub/sup pairs as per TeX
UpdatePresentationDataFromChildAt(1, -1, 1,
~NS_MATHML_DISPLAYSTYLE, NS_MATHML_DISPLAYSTYLE);
// switch the style of the postscripts and prescripts
InsertScriptLevelStyleContext(aPresContext);
// check whether or not this is an embellished operator

140
layout/mathml/base/src/nsMathMLmoverFrame.cpp
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@ -40,6 +40,7 @@
#include "nsStyleUtil.h"
#include "nsMathMLmoverFrame.h"
#include "nsMathMLmsupFrame.h"
//
// <mover> -- attach an overscript to a base - implementation
@ -186,18 +187,27 @@ XXX The winner is the outermost in conflicting settings like these:
}
}
//The REC says:
/*
Within overscript, <mover> always sets displaystyle to "false",
but increments scriptlevel by 1 only when accent is "false".
/* The REC says:
Within overscript, <mover> always sets displaystyle to "false",
but increments scriptlevel by 1 only when accent is "false".
*/
/*
The TeXBook treats 'over' like a superscript, so p.141 or Rule 13a
say it shouldn't be compressed. However, The TeXBook says
that math accents and \overline change uncramped styles to their
cramped counterparts.
*/
PRInt32 incrementScriptLevel;
if (overscriptMathMLFrame) {
incrementScriptLevel = NS_MATHML_IS_ACCENTOVER(mPresentationData.flags)? 0 : 1;
overscriptMathMLFrame->UpdatePresentationData(incrementScriptLevel, PR_FALSE, PR_FALSE);
overscriptMathMLFrame->UpdatePresentationDataFromChildAt(0, incrementScriptLevel, PR_FALSE, PR_FALSE);
PRInt32 increment = NS_MATHML_IS_ACCENTOVER(mPresentationData.flags)
? 0 : 1;
PRUint32 compress = NS_MATHML_IS_ACCENTOVER(mPresentationData.flags)
? NS_MATHML_COMPRESSED : 0;
overscriptMathMLFrame->UpdatePresentationData(increment,
~NS_MATHML_DISPLAYSTYLE | compress,
NS_MATHML_DISPLAYSTYLE | compress);
overscriptMathMLFrame->UpdatePresentationDataFromChildAt(0, -1, increment,
~NS_MATHML_DISPLAYSTYLE | compress,
NS_MATHML_DISPLAYSTYLE | compress);
}
// switch the style of the overscript
@ -214,13 +224,13 @@ The REC says:
position. In this case, the accent attribute is ignored. This is
often used for limits on symbols such as &sum;.
TODO:
i.e.:
if ( NS_MATHML_IS_MOVABLELIMITS(mPresentationData.flags) &&
!NS_MATHML_IS_DISPLAYSTYLE(mPresentationData.flags)) {
// place like superscript
}
else {
// place like accent
// place like overscript
}
*/
@ -231,6 +241,16 @@ nsMathMLmoverFrame::Place(nsIPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize)
{
nsresult rv = NS_OK;
if ( NS_MATHML_IS_MOVABLELIMITS(mPresentationData.flags) &&
!NS_MATHML_IS_DISPLAYSTYLE(mPresentationData.flags)) {
// place like superscript
return nsMathMLmsupFrame::PlaceSuperScript(aPresContext,
aRenderingContext,
aPlaceOrigin,
aDesiredSize,
this);
}
////////////////////////////////////
// Get the children's desired sizes
@ -257,12 +277,11 @@ nsMathMLmoverFrame::Place(nsIPresContext* aPresContext,
}
count++;
}
rv = childFrame->GetNextSibling(&childFrame);
NS_ASSERTION(NS_SUCCEEDED(rv),"failed to get next child");
childFrame->GetNextSibling(&childFrame);
}
if ((2 != count) || !baseFrame || !overFrame) {
#ifdef NS_DEBUG
printf("mover: invalid markup");
printf("mover: invalid markup\n");
#endif
// report an error, encourage people to get their markups in order
return ReflowError(aPresContext, aRenderingContext, aDesiredSize);
@ -291,7 +310,7 @@ nsMathMLmoverFrame::Place(nsIPresContext* aPresContext,
nscoord delta2 = 0; // extra space above overscript
if (!NS_MATHML_IS_ACCENTOVER(mPresentationData.flags)) {
// Rule 13a, App. G, TeXbook
// GetItalicCorrectionFromChild (baseFrame, correction);
GetItalicCorrection (bmBase, correction);
nscoord bigOpSpacing1, bigOpSpacing3, bigOpSpacing5, dummy;
GetBigOpSpacings (fm,
bigOpSpacing1, dummy,
@ -309,29 +328,46 @@ nsMathMLmoverFrame::Place(nsIPresContext* aPresContext,
else {
// Rule 12, App. G, TeXbook
GetSkewCorrectionFromChild (aPresContext, baseFrame, correction);
#if 0
delta1 = -PR_MIN(bmBase.ascent, xHeight);
#endif
// We don't follow Rule 12 here since TeX has some implicit
// assumptions in the computation of delta1.
// Should we use Rule 9 like \overline does?
delta1 = ruleThickness;
// We are going to modify this rule to make it more general.
// The idea behind Rule 12 in the TeXBook is to keep the accent
// as close to the base as possible, while ensuring that the
// distance between the *baseline* of the accent char and
// the *baseline* of the base is atleast x-height.
// The idea is that for normal use, we would like all the accents
// on a line to line up atleast x-height above the baseline
// if possible.
// When the ascent of the base is >= x-height,
// the baseline of the accent char is placed just above the base
// (specifically, the baseline of the accent char is placed
// above the baseline of the base by the ascent of the base).
// For ease of implementation,
// this assumes that the font-designer designs accents
// in such a way that the bottom of the accent is atleast x-height
// above its baseline, otherwise there will be collisions
// with the base. Also there should be proper padding between
// the bottom of the accent char and its baseline.
// The above rule may not be obvious from a first
// reading of rule 12 in the TeXBook !!!
// The mathml <mover> tag can use accent chars that
// do not follow this convention. So we modify TeX's rule
// so that TeX's rule gets subsumed for accents that follow
// TeX's convention,
// while also allowing accents that do not follow the convention :
// we try to keep the *bottom* of the accent char atleast x-height
// from the baseline of the base char. we also slap on an extra
// padding between the accent and base chars.
delta1 = ruleThickness; // we have atleast the padding
if (bmBase.ascent < xHeight) {
// also ensure atleast x-height above the baseline of the base
delta1 += xHeight - bmBase.ascent;
}
delta2 = ruleThickness;
}
// empty over?
if (0 == (bmOver.ascent + bmOver.descent)) delta1 = 0;
mBoundingMetrics.ascent =
bmOver.ascent + bmOver.descent + delta1 + bmBase.ascent;
#if 0
// Rule 12 (cont.)
if (NS_MATHML_IS_ACCENTOVER(mPresentationData.flags)) {
// delta1 is -ve for an accent
// hence as per Rule 12, App. G, TeXbook, we should ...
mBoundingMetrics.ascent = PR_MAX(mBoundingMetrics.ascent, bmBase.ascent);
}
#endif
bmOver.ascent + bmOver.descent + delta1 + bmBase.ascent;
mBoundingMetrics.descent = bmBase.descent;
if (NS_MATHML_IS_ACCENTOVER(mPresentationData.flags)) {
@ -344,7 +380,9 @@ nsMathMLmoverFrame::Place(nsIPresContext* aPresContext,
}
aDesiredSize.descent = baseSize.descent;
aDesiredSize.ascent = mBoundingMetrics.ascent + delta2;
aDesiredSize.ascent =
PR_MAX(mBoundingMetrics.ascent + delta2,
overSize.ascent + bmOver.descent + delta1 + bmBase.ascent);
aDesiredSize.height = aDesiredSize.ascent + aDesiredSize.descent;
aDesiredSize.width = mBoundingMetrics.width;
@ -361,7 +399,8 @@ nsMathMLmoverFrame::Place(nsIPresContext* aPresContext,
dxOver = correction/2 + (mBoundingMetrics.width - bmOver.width)/2;
}
dyOver = aDesiredSize.ascent - mBoundingMetrics.ascent + bmOver.ascent - overSize.ascent;
dyOver = aDesiredSize.ascent -
mBoundingMetrics.ascent + bmOver.ascent - overSize.ascent;
mReference.x = 0;
mReference.y = aDesiredSize.ascent;
@ -379,3 +418,34 @@ nsMathMLmoverFrame::Place(nsIPresContext* aPresContext,
}
return NS_OK;
}

115
layout/mathml/base/src/nsMathMLmsubFrame.cpp
Просмотреть файл

@ -69,10 +69,10 @@ nsMathMLmsubFrame::~nsMathMLmsubFrame()
NS_IMETHODIMP
nsMathMLmsubFrame::Init(nsIPresContext* aPresContext,
nsIContent* aContent,
nsIFrame* aParent,
nsIStyleContext* aContext,
nsIFrame* aPrevInFlow)
nsIContent* aContent,
nsIFrame* aParent,
nsIStyleContext* aContext,
nsIFrame* aPrevInFlow)
{
nsresult rv = nsMathMLContainerFrame::Init
(aPresContext, aContent, aParent, aContext, aPrevInFlow);
@ -91,19 +91,50 @@ nsMathMLmsubFrame::Init(nsIPresContext* aPresContext,
}
#if defined(NS_DEBUG) && defined(SHOW_BOUNDING_BOX)
// mPresentationData.flags |= NS_MATHML_SHOW_BOUNDING_METRICS;
mPresentationData.flags |= NS_MATHML_SHOW_BOUNDING_METRICS;
#endif
return rv;
}
NS_IMETHODIMP
nsMathMLmsubFrame::Place(nsIPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
PRBool aPlaceOrigin,
nsHTMLReflowMetrics& aDesiredSize)
nsMathMLmsubFrame::Place (nsIPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
PRBool aPlaceOrigin,
nsHTMLReflowMetrics& aDesiredSize)
{
return nsMathMLmsubFrame::PlaceSubScript(aPresContext,
aRenderingContext,
aPlaceOrigin,
aDesiredSize,
this,
mSubScriptShift,
mScriptSpace);
}
// exported routine that both munder and msub share.
// munder uses this when movablelimits is set.
nsresult
nsMathMLmsubFrame::PlaceSubScript (nsIPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
PRBool aPlaceOrigin,
nsHTMLReflowMetrics& aDesiredSize,
nsIFrame* aFrame,
nscoord aUserSubScriptShift,
nscoord aScriptSpace)
{
nsresult rv = NS_OK;
// the caller better be a mathml frame
nsIMathMLFrame* mathMLFrame = nsnull;
rv = aFrame->QueryInterface (NS_GET_IID(nsIMathMLFrame),
(void**)&mathMLFrame);
if (NS_FAILED(rv) || !mathMLFrame) return rv;
// force the scriptSpace to be atleast 1 pixel
float p2t;
aPresContext->GetScaledPixelsToTwips(&p2t);
aScriptSpace = PR_MAX(NSIntPixelsToTwips(1, p2t), aScriptSpace);
////////////////////////////////////
// Get the children's desired sizes
@ -117,36 +148,42 @@ nsMathMLmsubFrame::Place(nsIPresContext* aPresContext,
nsBoundingMetrics bmBase, bmSubScript;
nsIFrame* aChildFrame = mFrames.FirstChild();
nsIFrame* aChildFrame = nsnull;
rv = aFrame->FirstChild (aPresContext, nsnull, &aChildFrame);
if (!NS_SUCCEEDED(rv) || (nsnull == aChildFrame)) {
return rv;
}
while (nsnull != aChildFrame)
{
if (!IsOnlyWhitespace(aChildFrame)) {
if (0 == count) {
// base
baseFrame = aChildFrame;
// base
baseFrame = aChildFrame;
GetReflowAndBoundingMetricsFor(baseFrame, baseSize, bmBase);
}
else if (1 == count) {
// subscript
subScriptFrame = aChildFrame;
// subscript
subScriptFrame = aChildFrame;
GetReflowAndBoundingMetricsFor(subScriptFrame, subScriptSize, bmSubScript);
// get the subdrop from the subscript font
nscoord aSubDrop;
GetSubDropFromChild (aPresContext, subScriptFrame, aSubDrop);
// parameter v, Rule 18a, App. G, TeXbook
minSubScriptShift = bmBase.descent + aSubDrop;
// get the subdrop from the subscript font
nscoord aSubDrop;
GetSubDropFromChild (aPresContext, subScriptFrame, aSubDrop);
// parameter v, Rule 18a, App. G, TeXbook
minSubScriptShift = bmBase.descent + aSubDrop;
}
count++;
}
rv = aChildFrame->GetNextSibling(&aChildFrame);
NS_ASSERTION(NS_SUCCEEDED(rv),"failed to get next child");
aChildFrame->GetNextSibling(&aChildFrame);
}
#ifdef NS_DEBUG
if (2 != count) printf("msub: invalid markup");
if (2 != count) printf("msub: invalid markup\n");
#endif
if ((2 != count) || !baseFrame || !subScriptFrame) {
// report an error, encourage people to get their markups in order
return ReflowError(aPresContext, aRenderingContext, aDesiredSize);
return NS_STATIC_CAST(nsMathMLContainerFrame*,
aFrame)->ReflowError(aPresContext,
aRenderingContext,
aDesiredSize);
}
//////////////////
@ -177,21 +214,29 @@ nsMathMLmsubFrame::Place(nsIPresContext* aPresContext,
GetSubScriptShifts (fm, aSubScriptShift, dummy);
aSubScriptShift =
PR_MAX(aSubScriptShift, mSubScriptShift);
PR_MAX(aSubScriptShift, aUserSubScriptShift);
// get actual subscriptshift to be used
// Rule 18b, App. G, TeXbook
nscoord actualSubScriptShift =
PR_MAX(minSubScriptShift,PR_MAX(aSubScriptShift,minShiftFromXHeight));
// get bounding box for base + subscript
mBoundingMetrics.ascent =
nsBoundingMetrics boundingMetrics;
boundingMetrics.ascent =
PR_MAX(bmBase.ascent, bmSubScript.ascent - actualSubScriptShift);
mBoundingMetrics.descent =
boundingMetrics.descent =
PR_MAX(bmBase.descent, bmSubScript.descent + actualSubScriptShift);
// add mScriptSpace between base and supscript
mBoundingMetrics.width = bmBase.width + mScriptSpace + bmSubScript.width;
mBoundingMetrics.leftBearing = bmBase.leftBearing;
mBoundingMetrics.rightBearing = baseSize.width + mScriptSpace + bmSubScript.rightBearing;
// add aScriptSpace between base and supscript
boundingMetrics.width =
bmBase.width
+ aScriptSpace
+ bmSubScript.width;
boundingMetrics.leftBearing = bmBase.leftBearing;
boundingMetrics.rightBearing =
bmBase.width
+ aScriptSpace
+ bmSubScript.rightBearing;
mathMLFrame->SetBoundingMetrics (boundingMetrics);
// reflow metrics
aDesiredSize.ascent =
@ -199,10 +244,9 @@ nsMathMLmsubFrame::Place(nsIPresContext* aPresContext,
aDesiredSize.descent =
PR_MAX(baseSize.descent, subScriptSize.descent + actualSubScriptShift);
aDesiredSize.height = aDesiredSize.ascent + aDesiredSize.descent;
aDesiredSize.width = baseSize.width + mScriptSpace + subScriptSize.width;
aDesiredSize.width = bmBase.width + aScriptSpace + subScriptSize.width;
mReference.x = 0;
mReference.y = aDesiredSize.ascent;
mathMLFrame->SetReference(nsPoint(0, aDesiredSize.ascent));
if (aPlaceOrigin) {
nscoord dx, dy;
@ -210,11 +254,12 @@ nsMathMLmsubFrame::Place(nsIPresContext* aPresContext,
dx = 0; dy = aDesiredSize.ascent - baseSize.ascent;
FinishReflowChild (baseFrame, aPresContext, baseSize, dx, dy, 0);
// ... and subscript
dx = baseSize.width;
// XXX adding mScriptSpace seems to add more space than i like
// may want to remove later.
dx = bmBase.width + aScriptSpace;
dy = aDesiredSize.ascent - (subScriptSize.ascent - actualSubScriptShift);
FinishReflowChild (subScriptFrame, aPresContext, subScriptSize, dx, dy, 0);
}
return NS_OK;
}

17
layout/mathml/base/src/nsMathMLmsubFrame.h
Просмотреть файл

@ -48,6 +48,15 @@ public:
PRBool aPlaceOrigin,
nsHTMLReflowMetrics& aDesiredSize);
static nsresult
PlaceSubScript (nsIPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
PRBool aPlaceOrigin,
nsHTMLReflowMetrics& aDesiredSize,
nsIFrame* aForFrame,
nscoord aUserSubScriptShift = 0,
nscoord aScriptSpace = NSFloatPointsToTwips(0.5f));
NS_IMETHOD
SetInitialChildList(nsIPresContext* aPresContext,
nsIAtom* aListName,
@ -55,7 +64,13 @@ public:
{
nsresult rv;
rv = nsMathMLContainerFrame::SetInitialChildList(aPresContext, aListName, aChildList);
UpdatePresentationDataFromChildAt(1, 1, PR_FALSE, PR_FALSE);
// 1. The REC says:
// The <msub> element increments scriptlevel by 1, and sets displaystyle to
// "false", within subscript, but leaves both attributes unchanged within base.
// 2. The TeXbook (Ch 17. p.141) says the subscript is compressed
UpdatePresentationDataFromChildAt(1, -1, 1,
~NS_MATHML_DISPLAYSTYLE | NS_MATHML_COMPRESSED,
NS_MATHML_DISPLAYSTYLE | NS_MATHML_COMPRESSED);
// switch the style of the subscript
InsertScriptLevelStyleContext(aPresContext);
// check whether or not this is an embellished operator

234
layout/mathml/base/src/nsMathMLmsubsupFrame.cpp
Просмотреть файл

@ -3,7 +3,7 @@
* License Version 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/MPL/
*
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
@ -11,11 +11,11 @@
*
* The Original Code is Mozilla MathML Project.
*
* The Initial Developer of the Original Code is The University Of
* The Initial Developer of the Original Code is The University Of
* Queensland. Portions created by The University Of Queensland are
* Copyright (C) 1999 The University Of Queensland. All Rights Reserved.
*
* Contributor(s):
* Contributor(s):
* Roger B. Sidje <rbs@maths.uq.edu.au>
* David J. Fiddes <D.J.Fiddes@hw.ac.uk>
* Shyjan Mahamud <mahamud@cs.cmu.edu> (added TeX rendering rules)
@ -69,10 +69,10 @@ nsMathMLmsubsupFrame::~nsMathMLmsubsupFrame()
NS_IMETHODIMP
nsMathMLmsubsupFrame::Init(nsIPresContext* aPresContext,
nsIContent* aContent,
nsIFrame* aParent,
nsIStyleContext* aContext,
nsIFrame* aPrevInFlow)
nsIContent* aContent,
nsIFrame* aParent,
nsIStyleContext* aContext,
nsIFrame* aPrevInFlow)
{
nsresult rv = nsMathMLContainerFrame::Init
(aPresContext, aContent, aParent, aContext, aPrevInFlow);
@ -100,19 +100,52 @@ nsMathMLmsubsupFrame::Init(nsIPresContext* aPresContext,
}
#if defined(NS_DEBUG) && defined(SHOW_BOUNDING_BOX)
// mPresentationData.flags |= NS_MATHML_SHOW_BOUNDING_METRICS;
mPresentationData.flags |= NS_MATHML_SHOW_BOUNDING_METRICS;
#endif
return rv;
}
NS_IMETHODIMP
nsMathMLmsubsupFrame::Place(nsIPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
PRBool aPlaceOrigin,
nsHTMLReflowMetrics& aDesiredSize)
nsMathMLmsubsupFrame::Place (nsIPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
PRBool aPlaceOrigin,
nsHTMLReflowMetrics& aDesiredSize)
{
return nsMathMLmsubsupFrame::PlaceSubSupScript (aPresContext,
aRenderingContext,
aPlaceOrigin,
aDesiredSize,
this,
mSubScriptShift,
mScriptSpace);
}
// exported routine that both munderover and msubsup share.
// munderover uses this when movablelimits is set.
nsresult
nsMathMLmsubsupFrame::PlaceSubSupScript (nsIPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
PRBool aPlaceOrigin,
nsHTMLReflowMetrics& aDesiredSize,
nsIFrame* aFrame,
nscoord aUserSubScriptShift,
nscoord aUserSupScriptShift,
nscoord aScriptSpace)
{
nsresult rv = NS_OK;
// the caller better be a mathml frame
nsIMathMLFrame* mathMLFrame = nsnull;
rv = aFrame->QueryInterface (NS_GET_IID(nsIMathMLFrame),
(void**)&mathMLFrame);
if (NS_FAILED(rv) || !mathMLFrame) return rv;
// force the scriptSpace to be atleast 1 pixel
float p2t;
aPresContext->GetScaledPixelsToTwips(&p2t);
aScriptSpace = PR_MAX(NSIntPixelsToTwips(1, p2t), aScriptSpace);
////////////////////////////////////
// Get the children's desired sizes
@ -124,65 +157,70 @@ nsMathMLmsubsupFrame::Place(nsIPresContext* aPresContext,
nsIFrame* subScriptFrame = nsnull;
nsIFrame* supScriptFrame = nsnull;
// parameter v, Rule 18a, Appendix G of the TeXbook
nscoord minSubScriptShift = 0;
nscoord minSubScriptShift = 0;
// parameter u in Rule 18a, Appendix G of the TeXbook
nscoord minSupScriptShift = 0;
nscoord minSupScriptShift = 0;
nsBoundingMetrics bmBase, bmSubScript, bmSupScript;
nsIFrame* aChildFrame = mFrames.FirstChild();
while (nsnull != aChildFrame)
{
nsIFrame* aChildFrame = nsnull;
rv = aFrame->FirstChild (aPresContext, nsnull, &aChildFrame);
if (!NS_SUCCEEDED(rv) || (nsnull == aChildFrame)) {
return rv;
}
while (nsnull != aChildFrame) {
if (!IsOnlyWhitespace(aChildFrame)) {
if (0 == count) {
// base
baseFrame = aChildFrame;
// base
baseFrame = aChildFrame;
GetReflowAndBoundingMetricsFor(baseFrame, baseSize, bmBase);
}
else if (1 == count) {
// subscript
subScriptFrame = aChildFrame;
// subscript
subScriptFrame = aChildFrame;
GetReflowAndBoundingMetricsFor(subScriptFrame, subScriptSize, bmSubScript);
// get the subdrop from the subscript font
nscoord aSubDrop;
GetSubDropFromChild (aPresContext, subScriptFrame, aSubDrop);
// parameter v, Rule 18a, App. G, TeXbook
minSubScriptShift = bmBase.descent + aSubDrop;
// get the subdrop from the subscript font
nscoord aSubDrop;
GetSubDropFromChild (aPresContext, subScriptFrame, aSubDrop);
// parameter v, Rule 18a, App. G, TeXbook
minSubScriptShift = bmBase.descent + aSubDrop;
}
else if (2 == count) {
// superscript
supScriptFrame = aChildFrame;
// superscript
supScriptFrame = aChildFrame;
GetReflowAndBoundingMetricsFor(supScriptFrame, supScriptSize, bmSupScript);
// get the supdrop from the supscript font
nscoord aSupDrop;
GetSupDropFromChild (aPresContext, supScriptFrame, aSupDrop);
// parameter u, Rule 18a, App. G, TeXbook
minSupScriptShift = bmBase.ascent - aSupDrop;
// get the supdrop from the supscript font
nscoord aSupDrop;
GetSupDropFromChild (aPresContext, supScriptFrame, aSupDrop);
// parameter u, Rule 18a, App. G, TeXbook
minSupScriptShift = bmBase.ascent - aSupDrop;
}
count++;
}
rv = aChildFrame->GetNextSibling(&aChildFrame);
NS_ASSERTION(NS_SUCCEEDED(rv),"failed to get next child");
aChildFrame->GetNextSibling(&aChildFrame);
}
#ifdef NS_DEBUG
if (3 != count) printf("msubsup: invalid markup");
if (3 != count) printf("msubsup: invalid markup\n");
#endif
if ((3 != count) || !baseFrame || !subScriptFrame || !supScriptFrame) {
// report an error, encourage people to get their markups in order
return ReflowError(aPresContext, aRenderingContext, aDesiredSize);
return NS_STATIC_CAST(nsMathMLContainerFrame*,
aFrame)->ReflowError(aPresContext,
aRenderingContext,
aDesiredSize);
}
//////////////////
// Place Children
// Place Children
//////////////////
//////////////////////////////////////////////////
// Get subscript shift
// slightly different from nsMathMLmsubFrame.cpp
//////////////////////////////////////////////////
// aSubScriptShift{1,2}
// = minimum amount to shift the subscript down
// = minimum amount to shift the subscript down
// = sub{1,2} in TeXbook
// aSubScriptShift1 = subscriptshift attribute * x-height
nscoord aSubScriptShift1, aSubScriptShift2;
@ -202,31 +240,30 @@ nsMathMLmsubsupFrame::Place(nsIPresContext* aPresContext,
nscoord aRuleSize;
GetRuleThickness (aRenderingContext, fm, aRuleSize);
// Get aSubScriptShift{1,2} default from font
GetSubScriptShifts (fm, aSubScriptShift1, aSubScriptShift2);
if (0 < mSubScriptShift) {
if (0 < aUserSubScriptShift) {
// the user has set the subscriptshift attribute
float aFactor = ((float) aSubScriptShift2) / aSubScriptShift1;
aSubScriptShift1 = PR_MAX(aSubScriptShift1, mSubScriptShift);
aSubScriptShift1 = PR_MAX(aSubScriptShift1, aUserSubScriptShift);
aSubScriptShift2 = NSToCoordRound(aFactor * aSubScriptShift1);
}
// get a tentative value for subscriptshift
// Rule 18d, App. G, TeXbook
nscoord aSubScriptShift =
nscoord aSubScriptShift =
PR_MAX(minSubScriptShift,PR_MAX(aSubScriptShift1,aSubScriptShift2));
//////////////////////////////////////////////////
// Get supscript shift
// same code from nsMathMLmsupFrame.cpp
//////////////////////////////////////////////////
// get min supscript shift limit from x-height
// = d(x) + 1/4 * sigma_5, Rule 18c, App. G, TeXbook
nscoord minShiftFromXHeight = (nscoord)
nscoord minShiftFromXHeight = (nscoord)
(bmSupScript.descent + (1.0f/4.0f) * xHeight);
// aSupScriptShift{1,2,3}
@ -238,11 +275,11 @@ nsMathMLmsubsupFrame::Place(nsIPresContext* aPresContext,
nscoord aSupScriptShift1, aSupScriptShift2, aSupScriptShift3;
// Set aSupScriptShift{1,2,3} default from font
GetSupScriptShifts (fm, aSupScriptShift1, aSupScriptShift2, aSupScriptShift3);
if (0 < mSupScriptShift) {
if (0 < aUserSupScriptShift) {
// the user has set the superscriptshift attribute
float aFactor2 = ((float) aSupScriptShift2) / aSupScriptShift1;
float aFactor3 = ((float) aSupScriptShift3) / aSupScriptShift1;
aSupScriptShift1 = PR_MAX(aSupScriptShift1, mSupScriptShift);
aSupScriptShift1 = PR_MAX(aSupScriptShift1, aUserSupScriptShift);
aSupScriptShift2 = NSToCoordRound(aFactor2 * aSupScriptShift1);
aSupScriptShift3 = NSToCoordRound(aFactor3 * aSupScriptShift1);
}
@ -250,13 +287,15 @@ nsMathMLmsubsupFrame::Place(nsIPresContext* aPresContext,
// get sup script shift depending on current script level and display style
// Rule 18c, App. G, TeXbook
nscoord aSupScriptShift;
if ( mPresentationData.scriptLevel == 0 &&
NS_MATHML_IS_DISPLAYSTYLE(mPresentationData.flags) &&
!NS_MATHML_IS_COMPRESSED(mPresentationData.flags)) {
nsPresentationData presentationData;
mathMLFrame->GetPresentationData(presentationData);
if ( presentationData.scriptLevel == 0 &&
NS_MATHML_IS_DISPLAYSTYLE(presentationData.flags) &&
!NS_MATHML_IS_COMPRESSED(presentationData.flags)) {
// Style D in TeXbook
aSupScriptShift = aSupScriptShift1;
}
else if (NS_MATHML_IS_COMPRESSED(mPresentationData.flags)) {
else if (NS_MATHML_IS_COMPRESSED(presentationData.flags)) {
// Style C' in TeXbook = D',T',S',SS'
aSupScriptShift = aSupScriptShift3;
}
@ -265,20 +304,19 @@ nsMathMLmsubsupFrame::Place(nsIPresContext* aPresContext,
aSupScriptShift = aSupScriptShift2;
}
// get tentative value for superscriptshift
// get tentative value for superscriptshift
// Rule 18c, App. G, TeXbook
aSupScriptShift =
aSupScriptShift =
PR_MAX(minSupScriptShift,PR_MAX(aSupScriptShift,minShiftFromXHeight));
//////////////////////////////////////////////////
// Negotiate between aSupScriptShift and aSubScriptShift
// so that there will be enough gap between them
// Rule 18e, App. G, TeXbook
//////////////////////////////////////////////////
nscoord gap =
(aSupScriptShift - bmSupScript.descent) -
nscoord gap =
(aSupScriptShift - bmSupScript.descent) -
(bmSubScript.ascent - aSubScriptShift);
if (gap < 4.0f * aRuleSize) {
// adjust aSubScriptShift to get a gap of (4.0 * aRuleSize)
@ -286,9 +324,9 @@ nsMathMLmsubsupFrame::Place(nsIPresContext* aPresContext,
}
// next we want to ensure that the bottom of the superscript
// will be > (4/5) * x-height above baseline
gap = NSToCoordRound ((4.0f/5.0f) * xHeight -
(aSupScriptShift - bmSupScript.descent));
// will be > (4/5) * x-height above baseline
gap = NSToCoordRound ((4.0f/5.0f) * xHeight -
(aSupScriptShift - bmSupScript.descent));
if (gap > 0.0f) {
aSupScriptShift += gap;
aSubScriptShift -= gap;
@ -299,57 +337,51 @@ nsMathMLmsubsupFrame::Place(nsIPresContext* aPresContext,
//////////////////////////////////////////////////
// get bounding box for base + subscript + superscript
mBoundingMetrics.ascent =
PR_MAX(bmBase.ascent,(bmSupScript.ascent+aSupScriptShift));
mBoundingMetrics.descent =
PR_MAX(bmBase.descent,(bmSubScript.descent+aSubScriptShift));
nsBoundingMetrics boundingMetrics;
boundingMetrics.ascent =
PR_MAX(bmBase.ascent, (bmSupScript.ascent + aSupScriptShift));
boundingMetrics.descent =
PR_MAX(bmBase.descent, (bmSubScript.descent + aSubScriptShift));
// add mScriptSpace to both super/subscript
// add aScriptSpace to both super/subscript
// add italicCorrection only to superscript
// XXX this will be handled properly later ...
nscoord italicCorrection = 0;
mBoundingMetrics.width = bmBase.width + mScriptSpace +
PR_MAX((bmBase.supItalicCorrection + bmSupScript.width),
(bmBase.subItalicCorrection + bmSubScript.width));
nscoord italicCorrection;
GetItalicCorrection(bmBase, italicCorrection);
boundingMetrics.width = bmBase.width + aScriptSpace +
PR_MAX((italicCorrection + bmSupScript.width), bmSubScript.width);
boundingMetrics.leftBearing = bmBase.leftBearing;
boundingMetrics.rightBearing = bmBase.width + aScriptSpace +
PR_MAX((italicCorrection + bmSupScript.rightBearing), bmSubScript.rightBearing);
mathMLFrame->SetBoundingMetrics(boundingMetrics);
// to be simplified later
nscoord dyBase = mBoundingMetrics.ascent - bmBase.ascent;
nscoord dySubScript = mBoundingMetrics.ascent - bmSubScript.ascent + aSubScriptShift;
nscoord dySupScript = mBoundingMetrics.ascent - bmSupScript.ascent - aSupScriptShift;
nscoord baseTop = mBoundingMetrics.ascent - dyBase - bmBase.ascent + baseSize.ascent;
nscoord subScriptTop = mBoundingMetrics.ascent - dySubScript - bmSubScript.ascent + subScriptSize.ascent;
nscoord supScriptTop = mBoundingMetrics.ascent - dySupScript - bmSupScript.ascent + supScriptSize.ascent;
aDesiredSize.ascent =
PR_MAX(baseTop, PR_MAX(subScriptTop, supScriptTop));
aDesiredSize.descent =
PR_MAX(baseSize.height-baseTop,
PR_MAX(subScriptSize.height-subScriptTop, supScriptSize.height-supScriptTop));
// reflow metrics
aDesiredSize.ascent =
PR_MAX(baseSize.ascent,
PR_MAX(subScriptSize.ascent - aSubScriptShift,
supScriptSize.ascent + aSupScriptShift));
aDesiredSize.descent =
PR_MAX(baseSize.descent,
PR_MAX(subScriptSize.descent + aSubScriptShift,
supScriptSize.descent - aSupScriptShift));
aDesiredSize.height = aDesiredSize.ascent + aDesiredSize.descent;
aDesiredSize.width = bmBase.width + aScriptSpace +
PR_MAX((italicCorrection + supScriptSize.width), subScriptSize.width);
mReference.x = 0;
mReference.y = aDesiredSize.ascent;
mBoundingMetrics.leftBearing = bmBase.leftBearing;
mBoundingMetrics.rightBearing = bmBase.width + mScriptSpace +
PR_MAX((bmBase.supItalicCorrection + bmSupScript.rightBearing),
(bmBase.subItalicCorrection + bmSubScript.rightBearing));
aDesiredSize.width = mBoundingMetrics.width;
mathMLFrame->SetReference(nsPoint(0, aDesiredSize.ascent));
if (aPlaceOrigin) {
nscoord dx, dy;
// now place the base ...
dx = 0; dy = aDesiredSize.ascent - baseTop;
FinishReflowChild (baseFrame, aPresContext, baseSize, dx, dy, 0);
dx = 0; dy = aDesiredSize.ascent - baseSize.ascent;
FinishReflowChild(baseFrame, aPresContext, baseSize, dx, dy, 0);
// ... and subscript
dx = bmBase.width + bmBase.subItalicCorrection;
dy = aDesiredSize.ascent - subScriptTop;
FinishReflowChild (subScriptFrame, aPresContext, subScriptSize, dx, dy, 0);
dx = bmBase.width + aScriptSpace;
dy = aDesiredSize.ascent - (subScriptSize.ascent - aSubScriptShift);
FinishReflowChild(subScriptFrame, aPresContext, subScriptSize, dx, dy, 0);
// ... and the superscript
dx = bmBase.width + bmBase.supItalicCorrection;
dy = aDesiredSize.ascent - supScriptTop;
FinishReflowChild (supScriptFrame, aPresContext, supScriptSize, dx, dy, 0);
dx = bmBase.width + aScriptSpace + italicCorrection;
dy = aDesiredSize.ascent - (supScriptSize.ascent + aSupScriptShift);
FinishReflowChild(supScriptFrame, aPresContext, supScriptSize, dx, dy, 0);
}
return NS_OK;

23
layout/mathml/base/src/nsMathMLmsubsupFrame.h
Просмотреть файл

@ -48,6 +48,16 @@ public:
PRBool aPlaceOrigin,
nsHTMLReflowMetrics& aDesiredSize);
static nsresult
PlaceSubSupScript(nsIPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
PRBool aPlaceOrigin,
nsHTMLReflowMetrics& aDesiredSize,
nsIFrame* aForFrame,
nscoord aUserSubScriptShift = 0,
nscoord aUserSupScriptShift = 0,
nscoord aScriptSpace = NSFloatPointsToTwips(0.5f));
NS_IMETHOD
SetInitialChildList(nsIPresContext* aPresContext,
nsIAtom* aListName,
@ -55,7 +65,18 @@ public:
{
nsresult rv;
rv = nsMathMLContainerFrame::SetInitialChildList(aPresContext, aListName, aChildList);
UpdatePresentationDataFromChildAt(1, 1, PR_FALSE, PR_FALSE);
// 1. The REC says:
// The <msubsup> element increments scriptlevel by 1, and sets displaystyle to
// "false", within subscript and superscript, but leaves both attributes
// unchanged within base.
// 2. The TeXbook (Ch 17. p.141) says the superscript inherits the compression
// while the subscript is compressed
UpdatePresentationDataFromChildAt(1, -1, 1,
~NS_MATHML_DISPLAYSTYLE,
NS_MATHML_DISPLAYSTYLE);
UpdatePresentationDataFromChildAt(1, 1, 0,
NS_MATHML_COMPRESSED,
NS_MATHML_COMPRESSED);
// switch the style of the subscript and superscript
InsertScriptLevelStyleContext(aPresContext);
// check whether or not this is an embellished operator

119
layout/mathml/base/src/nsMathMLmsupFrame.cpp
Просмотреть файл

@ -90,24 +90,55 @@ nsMathMLmsupFrame::Init(nsIPresContext* aPresContext,
}
#if defined(NS_DEBUG) && defined(SHOW_BOUNDING_BOX)
// mPresentationData.flags |= NS_MATHML_SHOW_BOUNDING_METRICS;
mPresentationData.flags |= NS_MATHML_SHOW_BOUNDING_METRICS;
#endif
return rv;
}
NS_IMETHODIMP
nsMathMLmsupFrame::Place(nsIPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
PRBool aPlaceOrigin,
nsHTMLReflowMetrics& aDesiredSize)
nsMathMLmsupFrame::Place (nsIPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
PRBool aPlaceOrigin,
nsHTMLReflowMetrics& aDesiredSize)
{
return nsMathMLmsupFrame::PlaceSuperScript (aPresContext,
aRenderingContext,
aPlaceOrigin,
aDesiredSize,
this,
mSupScriptShift,
mScriptSpace);
}
// exported routine that both mover and msup share.
// mover uses this when movablelimits is set.
nsresult
nsMathMLmsupFrame::PlaceSuperScript(nsIPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
PRBool aPlaceOrigin,
nsHTMLReflowMetrics& aDesiredSize,
nsIFrame* aFrame,
nscoord aUserSupScriptShift,
nscoord aScriptSpace)
{
nsresult rv = NS_OK;
// the caller better be a mathml frame
nsIMathMLFrame* mathMLFrame = nsnull;
rv = aFrame->QueryInterface (NS_GET_IID(nsIMathMLFrame),
(void**)&mathMLFrame);
if (NS_FAILED(rv) || !mathMLFrame) return rv;
// force the scriptSpace to be at least 1 pixel
float p2t;
aPresContext->GetScaledPixelsToTwips(&p2t);
nscoord onePixel = NSIntPixelsToTwips(1, p2t);
aScriptSpace = PR_MAX(onePixel, aScriptSpace);
////////////////////////////////////
// Get the children's desired sizes
PRInt32 count = 0;
nsRect aRect;
nsHTMLReflowMetrics baseSize (nsnull);
nsHTMLReflowMetrics supScriptSize (nsnull);
nsIFrame* baseFrame = nsnull;
@ -117,36 +148,38 @@ nsMathMLmsupFrame::Place(nsIPresContext* aPresContext,
nsBoundingMetrics bmBase, bmSupScript;
nsIFrame* aChildFrame = mFrames.FirstChild();
while (nsnull != aChildFrame)
{
nsIFrame* aChildFrame = nsnull;
aFrame->FirstChild(aPresContext, nsnull, &aChildFrame);
while (nsnull != aChildFrame) {
if (!IsOnlyWhitespace(aChildFrame)) {
if (0 == count) {
// base
baseFrame = aChildFrame;
// base
baseFrame = aChildFrame;
GetReflowAndBoundingMetricsFor(baseFrame, baseSize, bmBase);
}
else if (1 == count) {
// superscript
supScriptFrame = aChildFrame;
// superscript
supScriptFrame = aChildFrame;
GetReflowAndBoundingMetricsFor(supScriptFrame, supScriptSize, bmSupScript);
// get the supdrop from the supscript font
nscoord aSupDrop;
GetSupDropFromChild (aPresContext, supScriptFrame, aSupDrop);
// parameter u, Rule 18a, App. G, TeXbook
minSupScriptShift = bmBase.ascent - aSupDrop;
// get the supdrop from the supscript font
nscoord aSupDrop;
GetSupDropFromChild (aPresContext, supScriptFrame, aSupDrop);
// parameter u, Rule 18a, App. G, TeXbook
minSupScriptShift = bmBase.ascent - aSupDrop;
}
count++;
}
rv = aChildFrame->GetNextSibling(&aChildFrame);
NS_ASSERTION(NS_SUCCEEDED(rv),"failed to get next child");
aChildFrame->GetNextSibling(&aChildFrame);
}
#ifdef NS_DEBUG
if (2 != count) printf("msup: invalid markup");
if (2 != count) printf("msup: invalid markup\n");
#endif
if ((2 != count) || !baseFrame || !supScriptFrame) {
// report an error, encourage people to get their markups in order
return ReflowError(aPresContext, aRenderingContext, aDesiredSize);
return NS_STATIC_CAST(nsMathMLContainerFrame*,
aFrame)->ReflowError(aPresContext,
aRenderingContext,
aDesiredSize);
}
//////////////////
@ -158,7 +191,7 @@ nsMathMLmsupFrame::Place(nsIPresContext* aPresContext,
nsCOMPtr<nsIFontMetrics> fm;
// const nsStyleFont* aFont =
// (const nsStyleFont*) mStyleContext->GetStyleData (eStyleStruct_Font);
// (const nsStyleFont*) aStyleContext->GetStyleData (eStyleStruct_Font);
const nsStyleFont *aFont;
baseFrame->GetStyleData(eStyleStruct_Font, (const nsStyleStruct *&)aFont);
@ -167,6 +200,8 @@ nsMathMLmsupFrame::Place(nsIPresContext* aPresContext,
fm->GetXHeight (xHeight);
nscoord minShiftFromXHeight = (nscoord)
(bmSupScript.descent + (1.0f/4.0f) * xHeight);
nscoord italicCorrection;
GetItalicCorrection(bmBase, italicCorrection);
// aSupScriptShift{1,2,3}
// = minimum amount to shift the supscript up
@ -178,12 +213,12 @@ nsMathMLmsupFrame::Place(nsIPresContext* aPresContext,
// Set aSupScriptShift{1,2,3} default from font
GetSupScriptShifts (fm, aSupScriptShift1, aSupScriptShift2, aSupScriptShift3);
if (0 < mSupScriptShift) {
if (0 < aUserSupScriptShift) {
// the user has set the superscriptshift attribute
float aFactor2 = ((float) aSupScriptShift2) / aSupScriptShift1;
float aFactor3 = ((float) aSupScriptShift3) / aSupScriptShift1;
aSupScriptShift1 =
PR_MAX(aSupScriptShift1, mSupScriptShift);
PR_MAX(aSupScriptShift1, aUserSupScriptShift);
aSupScriptShift2 = NSToCoordRound(aFactor2 * aSupScriptShift1);
aSupScriptShift3 = NSToCoordRound(aFactor3 * aSupScriptShift1);
}
@ -191,13 +226,15 @@ nsMathMLmsupFrame::Place(nsIPresContext* aPresContext,
// get sup script shift depending on current script level and display style
// Rule 18c, App. G, TeXbook
nscoord aSupScriptShift;
if ( mPresentationData.scriptLevel == 0 &&
NS_MATHML_IS_DISPLAYSTYLE(mPresentationData.flags) &&
!NS_MATHML_IS_COMPRESSED(mPresentationData.flags)) {
nsPresentationData presentationData;
mathMLFrame->GetPresentationData (presentationData);
if ( presentationData.scriptLevel == 0 &&
NS_MATHML_IS_DISPLAYSTYLE(presentationData.flags) &&
!NS_MATHML_IS_COMPRESSED(presentationData.flags)) {
// Style D in TeXbook
aSupScriptShift = aSupScriptShift1;
}
else if (NS_MATHML_IS_COMPRESSED(mPresentationData.flags)) {
else if (NS_MATHML_IS_COMPRESSED(presentationData.flags)) {
// Style C' in TeXbook = D',T',S',SS'
aSupScriptShift = aSupScriptShift3;
}
@ -212,14 +249,18 @@ nsMathMLmsupFrame::Place(nsIPresContext* aPresContext,
PR_MAX(minSupScriptShift,PR_MAX(aSupScriptShift,minShiftFromXHeight));
// bounding box
mBoundingMetrics.ascent =
nsBoundingMetrics boundingMetrics;
boundingMetrics.ascent =
PR_MAX(bmBase.ascent, (bmSupScript.ascent + actualSupScriptShift));
mBoundingMetrics.descent =
boundingMetrics.descent =
PR_MAX(bmBase.descent, (bmSupScript.descent - actualSupScriptShift));
// add mScriptSpace between base and supscript
mBoundingMetrics.width = bmBase.width + mScriptSpace + bmSupScript.width;
mBoundingMetrics.leftBearing = bmBase.leftBearing;
mBoundingMetrics.rightBearing = bmBase.width + mScriptSpace + bmSupScript.rightBearing;
// add scriptSpace between base and supscript
boundingMetrics.width = bmBase.width + aScriptSpace
+ italicCorrection + bmSupScript.width;
boundingMetrics.leftBearing = bmBase.leftBearing;
boundingMetrics.rightBearing = bmBase.width + aScriptSpace
+ italicCorrection + bmSupScript.rightBearing;
mathMLFrame->SetBoundingMetrics(boundingMetrics);
// reflow metrics
aDesiredSize.ascent =
@ -227,10 +268,10 @@ nsMathMLmsupFrame::Place(nsIPresContext* aPresContext,
aDesiredSize.descent =
PR_MAX(baseSize.descent, (supScriptSize.descent - actualSupScriptShift));
aDesiredSize.height = aDesiredSize.ascent + aDesiredSize.descent;
aDesiredSize.width = baseSize.width + mScriptSpace + supScriptSize.width;
aDesiredSize.width = bmBase.width + aScriptSpace
+ italicCorrection + supScriptSize.width;
mReference.x = 0;
mReference.y = aDesiredSize.ascent;
mathMLFrame->SetReference(nsPoint(0, aDesiredSize.ascent));
if (aPlaceOrigin) {
nscoord dx, dy;
@ -238,7 +279,7 @@ nsMathMLmsupFrame::Place(nsIPresContext* aPresContext,
dx = 0; dy = aDesiredSize.ascent - baseSize.ascent;
FinishReflowChild (baseFrame, aPresContext, baseSize, dx, dy, 0);
// ... and supscript
dx = baseSize.width + mScriptSpace;
dx = bmBase.width + aScriptSpace + italicCorrection;
dy = aDesiredSize.ascent - (supScriptSize.ascent + actualSupScriptShift);
FinishReflowChild (supScriptFrame, aPresContext, supScriptSize, dx, dy, 0);
}

18
layout/mathml/base/src/nsMathMLmsupFrame.h
Просмотреть файл

@ -48,6 +48,15 @@ public:
PRBool aPlaceOrigin,
nsHTMLReflowMetrics& aDesiredSize);
static nsresult
PlaceSuperScript (nsIPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
PRBool aPlaceOrigin,
nsHTMLReflowMetrics& aDesiredSize,
nsIFrame* aForFrame,
nscoord aUserSupScriptShift = 0,
nscoord aScriptSpace = NSFloatPointsToTwips(0.5f));
NS_IMETHOD
SetInitialChildList(nsIPresContext* aPresContext,
nsIAtom* aListName,
@ -55,7 +64,14 @@ public:
{
nsresult rv;
rv = nsMathMLContainerFrame::SetInitialChildList(aPresContext, aListName, aChildList);
UpdatePresentationDataFromChildAt(1, 1, PR_FALSE, PR_FALSE);
// 1. The REC says:
// The <msup> element increments scriptlevel by 1, and sets displaystyle to
// "false", within superscript, but leaves both attributes unchanged within base.
// 2. The TeXbook (Ch 17. p.141) says the superscript *inherits* the compression,
// so we don't set the compression flag. Our parent will propagate its own.
UpdatePresentationDataFromChildAt(1, -1, 1,
~NS_MATHML_DISPLAYSTYLE,
NS_MATHML_DISPLAYSTYLE);
// switch the style of the superscript
InsertScriptLevelStyleContext(aPresContext);
// check whether or not this is an embellished operator

48
layout/mathml/base/src/nsMathMLmunderFrame.cpp
Просмотреть файл

@ -40,6 +40,7 @@
#include "nsStyleUtil.h"
#include "nsMathMLmunderFrame.h"
#include "nsMathMLmsubFrame.h"
//
// <munder> -- attach an underscript to a base - implementation
@ -184,18 +185,23 @@ XXX The winner is the outermost setting in conflicting settings like these:
}
}
//The REC says:
/* The REC says:
Within underscript, <munder> always sets displaystyle to "false",
but increments scriptlevel by 1 only when accentunder is "false".
*/
/*
Within underscript, <munder> always sets displaystyle to "false",
but increments scriptlevel by 1 only when accentunder is "false".
The TeXBook treats 'under' like a subscript, so p.141 or Rule 13a
say it should be compressed
*/
PRInt32 incrementScriptLevel;
if (underscriptMathMLFrame) {
incrementScriptLevel = NS_MATHML_IS_ACCENTUNDER(mPresentationData.flags)? 0 : 1;
underscriptMathMLFrame->UpdatePresentationData(incrementScriptLevel, PR_FALSE, PR_FALSE);
underscriptMathMLFrame->UpdatePresentationDataFromChildAt(0, incrementScriptLevel, PR_FALSE, PR_FALSE);
PRInt32 increment;
increment = NS_MATHML_IS_ACCENTUNDER(mPresentationData.flags)? 0 : 1;
underscriptMathMLFrame->UpdatePresentationData(increment,
~NS_MATHML_DISPLAYSTYLE | NS_MATHML_COMPRESSED,
NS_MATHML_DISPLAYSTYLE | NS_MATHML_COMPRESSED);
underscriptMathMLFrame->UpdatePresentationDataFromChildAt(0, -1, increment,
~NS_MATHML_DISPLAYSTYLE | NS_MATHML_COMPRESSED,
NS_MATHML_DISPLAYSTYLE | NS_MATHML_COMPRESSED);
}
// switch the style of the underscript
@ -213,13 +219,13 @@ The REC says:
the accentunder attribute is ignored. This is often used
for limits on symbols such as &sum;.
TODO:
i.e.,:
if ( NS_MATHML_IS_MOVABLELIMITS(mPresentationData.flags) &&
!NS_MATHML_IS_DISPLAYSTYLE(mPresentationData.flags)) {
// place like subscript
}
else {
// place like accentunder
// place like underscript
}
*/
@ -231,6 +237,16 @@ nsMathMLmunderFrame::Place(nsIPresContext* aPresContext,
{
nsresult rv = NS_OK;
if ( NS_MATHML_IS_MOVABLELIMITS(mPresentationData.flags) &&
!NS_MATHML_IS_DISPLAYSTYLE(mPresentationData.flags)) {
// place like subscript
return nsMathMLmsubFrame::PlaceSubScript(aPresContext,
aRenderingContext,
aPlaceOrigin,
aDesiredSize,
this);
}
////////////////////////////////////
// Get the children's desired sizes
@ -290,7 +306,7 @@ nsMathMLmunderFrame::Place(nsIPresContext* aPresContext,
nscoord delta2 = 0; // extra space beneath underscript
if (!NS_MATHML_IS_ACCENTUNDER(mPresentationData.flags)) {
// Rule 13a, App. G, TeXbook
// GetItalicCorrectionFromChild (baseFrame, italicCorrection);
GetItalicCorrection (bmBase, italicCorrection);
nscoord bigOpSpacing2, bigOpSpacing4, bigOpSpacing5, dummy;
GetBigOpSpacings (fm,
dummy, bigOpSpacing2,
@ -321,9 +337,13 @@ nsMathMLmunderFrame::Place(nsIPresContext* aPresContext,
nscoord dxUnder = (mBoundingMetrics.width - (bmUnder.width + italicCorrection/2)) / 2;
aDesiredSize.ascent = baseSize.ascent;
aDesiredSize.descent = mBoundingMetrics.descent + delta2;
aDesiredSize.descent =
PR_MAX(mBoundingMetrics.descent + delta2,
bmBase.descent + delta1 + bmUnder.ascent + underSize.descent);
aDesiredSize.height = aDesiredSize.ascent + aDesiredSize.descent;
aDesiredSize.width = mBoundingMetrics.width;
aDesiredSize.width =
PR_MAX(baseSize.width/2,(underSize.width + italicCorrection/2)/2) +
PR_MAX(baseSize.width/2,(underSize.width - italicCorrection/2)/2);
mReference.x = 0;
mReference.y = aDesiredSize.ascent;

93
layout/mathml/base/src/nsMathMLmunderoverFrame.cpp
Просмотреть файл

@ -40,6 +40,7 @@
#include "nsStyleUtil.h"
#include "nsMathMLmunderoverFrame.h"
#include "nsMathMLmsubsupFrame.h"
//
// <munderover> -- attach an underscript-overscript pair to a base - implementation
@ -79,6 +80,9 @@ nsMathMLmunderoverFrame::Init(nsIPresContext* aPresContext,
mEmbellishData.flags |= NS_MATHML_STRETCH_ALL_CHILDREN_HORIZONTALLY;
#if defined(NS_DEBUG) && defined(SHOW_BOUNDING_BOX)
mPresentationData.flags |= NS_MATHML_SHOW_BOUNDING_METRICS;
#endif
return rv;
}
@ -218,21 +222,40 @@ nsMathMLmunderoverFrame::SetInitialChildList(nsIPresContext* aPresContext,
but increments scriptlevel by 1 only when accent is "false".
*/
PRInt32 incrementScriptLevel;
if (underscriptMathMLFrame) {
incrementScriptLevel = NS_MATHML_IS_ACCENTUNDER(mPresentationData.flags)? 0 : 1;
underscriptMathMLFrame->UpdatePresentationData(incrementScriptLevel, PR_FALSE, PR_FALSE);
underscriptMathMLFrame->UpdatePresentationDataFromChildAt(0, incrementScriptLevel, PR_FALSE, PR_FALSE);
}
/*
The TeXBook treats 'over' like a superscript, so p.141 or Rule 13a
say it shouldn't be compressed. However, The TeXBook says
that math accents and \overline change uncramped styles to their
cramped counterparts.
*/
if (overscriptMathMLFrame)
{
incrementScriptLevel = NS_MATHML_IS_ACCENTOVER(mPresentationData.flags)? 0 : 1;
overscriptMathMLFrame->UpdatePresentationData(incrementScriptLevel, PR_FALSE, PR_FALSE);
overscriptMathMLFrame->UpdatePresentationDataFromChildAt(0, incrementScriptLevel, PR_FALSE, PR_FALSE);
PRInt32 increment = NS_MATHML_IS_ACCENTOVER(mPresentationData.flags)
? 0 : 1;
PRUint32 compress = NS_MATHML_IS_ACCENTOVER(mPresentationData.flags)
? NS_MATHML_COMPRESSED : 0;
overscriptMathMLFrame->UpdatePresentationData(increment,
~NS_MATHML_DISPLAYSTYLE | compress,
NS_MATHML_DISPLAYSTYLE | compress);
overscriptMathMLFrame->UpdatePresentationDataFromChildAt(0, -1, increment,
~NS_MATHML_DISPLAYSTYLE | compress,
NS_MATHML_DISPLAYSTYLE | compress);
}
/*
The TeXBook treats 'under' like a subscript, so p.141 or Rule 13a
say it should be compressed
*/
if (underscriptMathMLFrame) {
PRInt32 increment = NS_MATHML_IS_ACCENTUNDER(mPresentationData.flags)? 0 : 1;
underscriptMathMLFrame->UpdatePresentationData(increment,
~NS_MATHML_DISPLAYSTYLE | NS_MATHML_COMPRESSED,
NS_MATHML_DISPLAYSTYLE | NS_MATHML_COMPRESSED);
underscriptMathMLFrame->UpdatePresentationDataFromChildAt(0, -1, increment,
~NS_MATHML_DISPLAYSTYLE | NS_MATHML_COMPRESSED,
NS_MATHML_DISPLAYSTYLE | NS_MATHML_COMPRESSED);
}
// switch the style of the underscript and the overscript
InsertScriptLevelStyleContext(aPresContext);
@ -248,16 +271,17 @@ The REC says:
the accent and accentunder attributes are ignored. This is often
used for limits on symbols such as &sum;.
TODO:
i.e.,:
if ( NS_MATHML_IS_MOVABLELIMITS(mPresentationData.flags) &&
!NS_MATHML_IS_DISPLAYSTYLE(mPresentationData.flags)) {
// place like subscript-superscript pair
}
else {
// place like accentunder-accent pair
// place like underscript-overscript pair
}
*/
NS_IMETHODIMP
nsMathMLmunderoverFrame::Place(nsIPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
@ -266,6 +290,16 @@ nsMathMLmunderoverFrame::Place(nsIPresContext* aPresContext,
{
nsresult rv = NS_OK;
if ( NS_MATHML_IS_MOVABLELIMITS(mPresentationData.flags) &&
!NS_MATHML_IS_DISPLAYSTYLE(mPresentationData.flags)) {
// place like sub-superscript pair
return nsMathMLmsubsupFrame::PlaceSubSupScript(aPresContext,
aRenderingContext,
aPlaceOrigin,
aDesiredSize,
this);
}
////////////////////////////////////
// Get the children's desired sizes
@ -298,8 +332,7 @@ nsMathMLmunderoverFrame::Place(nsIPresContext* aPresContext,
}
count++;
}
rv = childFrame->GetNextSibling(&childFrame);
NS_ASSERTION(NS_SUCCEEDED(rv),"failed to get next child");
childFrame->GetNextSibling(&childFrame);
}
if ((3 != count) || !baseFrame || !underFrame || !overFrame) {
#ifdef NS_DEBUG
@ -333,7 +366,7 @@ nsMathMLmunderoverFrame::Place(nsIPresContext* aPresContext,
if (!NS_MATHML_IS_ACCENTUNDER(mPresentationData.flags)) {
// Rule 13a, App. G, TeXbook
// GetItalicCorrectionFromChild (baseFrame, italicCorrection);
GetItalicCorrection (bmBase, italicCorrection);
nscoord bigOpSpacing2, bigOpSpacing4, bigOpSpacing5, dummy;
GetBigOpSpacings (fm,
dummy, bigOpSpacing2,
@ -353,13 +386,13 @@ nsMathMLmunderoverFrame::Place(nsIPresContext* aPresContext,
// empty under?
if (0 == (bmUnder.ascent + bmUnder.descent)) underDelta1 = 0;
nscoord aCorrection = 0;
nscoord correction = 0;
nscoord overDelta1 = 0; // gap between base and overscript
nscoord overDelta2 = 0; // extra space above overscript
if (!NS_MATHML_IS_ACCENTOVER(mPresentationData.flags)) {
// Rule 13a, App. G, TeXbook
// GetItalicCorrectionFromChild (baseFrame, aCorrection);
GetItalicCorrection (bmBase, italicCorrection);
nscoord bigOpSpacing1, bigOpSpacing3, bigOpSpacing5, dummy;
GetBigOpSpacings (fm,
bigOpSpacing1, dummy,
@ -376,13 +409,11 @@ nsMathMLmunderoverFrame::Place(nsIPresContext* aPresContext,
}
else {
// Rule 13, App. G, TeXbook
GetSkewCorrectionFromChild (aPresContext, baseFrame, aCorrection);
#if 0
// XXX tune these
overDelta1 = PR_MIN(bmOver.ascent,xHeight);
overDelta2 = 0;
#endif
GetSkewCorrectionFromChild (aPresContext, baseFrame, correction);
overDelta1 = ruleThickness;
if (bmBase.ascent < xHeight) {
overDelta1 += xHeight - bmBase.ascent;
}
overDelta2 = ruleThickness;
}
// empty over?
@ -393,17 +424,19 @@ nsMathMLmunderoverFrame::Place(nsIPresContext* aPresContext,
mBoundingMetrics.descent =
bmBase.descent + underDelta1 + bmUnder.ascent + bmUnder.descent;
mBoundingMetrics.width =
PR_MAX(bmBase.width/2,PR_MAX((bmUnder.width + italicCorrection/2)/2,(bmOver.width - aCorrection/2)/2)) +
PR_MAX(bmBase.width/2,PR_MAX((bmUnder.width - italicCorrection/2)/2,(bmOver.width + aCorrection/2)/2));
PR_MAX(bmBase.width/2,PR_MAX((bmUnder.width + italicCorrection/2)/2,(bmOver.width - correction/2)/2)) +
PR_MAX(bmBase.width/2,PR_MAX((bmUnder.width - italicCorrection/2)/2,(bmOver.width + correction/2)/2));
nscoord dxBase = (mBoundingMetrics.width - bmBase.width) / 2;
nscoord dxOver = (mBoundingMetrics.width - (bmOver.width - aCorrection/2)) / 2;
nscoord dxOver = (mBoundingMetrics.width - (bmOver.width - correction/2)) / 2;
nscoord dxUnder = (mBoundingMetrics.width - (bmUnder.width + italicCorrection/2)) / 2;
aDesiredSize.ascent =
mBoundingMetrics.ascent + overDelta2;
PR_MAX(mBoundingMetrics.ascent + overDelta2,
overSize.ascent + bmOver.descent + overDelta1 + bmBase.ascent);
aDesiredSize.descent =
mBoundingMetrics.descent + underDelta2;
PR_MAX(mBoundingMetrics.descent + underDelta2,
bmBase.descent + underDelta1 + bmUnder.ascent + underSize.descent);
aDesiredSize.height = aDesiredSize.ascent + aDesiredSize.descent;
aDesiredSize.width = mBoundingMetrics.width;