/* virtual */ nsresult
nsMathMLmpaddedFrame::Place(nsIRenderingContext& aRenderingContext,
PRBool aPlaceOrigin,
nsHTMLReflowMetrics& aDesiredSize)
{
nsresult rv =
nsMathMLContainerFrame::Place(aRenderingContext, PR_FALSE, aDesiredSize);
if (NS_MATHML_HAS_ERROR(mPresentationData.flags) || NS_FAILED(rv)) {
DidReflowChildren(GetFirstChild(nsnull));
return rv;
}
nscoord height = mBoundingMetrics.ascent;
nscoord depth = mBoundingMetrics.descent;
// In MathML2 (http://www.w3.org/TR/MathML2/chapter3.html#presm.mpadded),
// lspace is "the amount of space between the left edge of a bounding box
// and the start of the rendering of its contents' bounding box" and the
// default is zero.
//
// In MathML3 draft
// http://www.w3.org/TR/2007/WD-MathML3-20070427/chapter3.html#id.3.3.6.2,
// lspace is "the amount of space between the left edge of the bounding box
// and the positioning poin [sic] of the mpadded element" and the default is
// "same as content".
//
// In both cases, "MathML renderers should ensure that, except for the
// effects of the attributes, relative spacing between the contents of
// mpadded and surrounding MathML elements is not modified by replacing an
// mpadded element with an mrow element with the same content."
nscoord lspace = 0;
// In MATHML3, "width" will be the bounding box width and "advancewidth" will
// refer "to the horizontal distance between the positioning point of the
// mpadded and the positioning point for the following content". MathML2
// doesn't make the distinction.
nscoord width = mBoundingMetrics.width;
PRInt32 pseudoUnit;
// update width
pseudoUnit = (mWidthPseudoUnit == NS_MATHML_PSEUDO_UNIT_ITSELF)
? NS_MATHML_PSEUDO_UNIT_WIDTH : mWidthPseudoUnit;
UpdateValue(mWidthSign, pseudoUnit, mWidth,
lspace, mBoundingMetrics, width);
// update "height" (this is the ascent in the terminology of the REC)
pseudoUnit = (mHeightPseudoUnit == NS_MATHML_PSEUDO_UNIT_ITSELF)
? NS_MATHML_PSEUDO_UNIT_HEIGHT : mHeightPseudoUnit;
UpdateValue(mHeightSign, pseudoUnit, mHeight,
lspace, mBoundingMetrics, height);
// update "depth" (this is the descent in the terminology of the REC)
pseudoUnit = (mDepthPseudoUnit == NS_MATHML_PSEUDO_UNIT_ITSELF)
? NS_MATHML_PSEUDO_UNIT_DEPTH : mDepthPseudoUnit;
UpdateValue(mDepthSign, pseudoUnit, mDepth,
lspace, mBoundingMetrics, depth);
// update lspace -- should be *last* because lspace is overwritten!!
pseudoUnit = (mLeftSpacePseudoUnit == NS_MATHML_PSEUDO_UNIT_ITSELF)
? NS_MATHML_PSEUDO_UNIT_LSPACE : mLeftSpacePseudoUnit;
UpdateValue(mLeftSpaceSign, pseudoUnit, mLeftSpace,
lspace, mBoundingMetrics, lspace);
// do the padding now that we have everything
// The idea here is to maintain the invariant that <mpadded>...</mpadded> (i.e.,
// with no attributes) looks the same as <mrow>...</mrow>. But when there are
// attributes, tweak our metrics and move children to achieve the desired visual
// effects.
if (mLeftSpaceSign != NS_MATHML_SIGN_INVALID) { // there was padding on the left
// dismiss the left italic correction now (so that our parent won't correct us)
mBoundingMetrics.leftBearing = 0;
}
if (mLeftSpaceSign != NS_MATHML_SIGN_INVALID ||
mWidthSign != NS_MATHML_SIGN_INVALID) { // there was padding on the right
// dismiss the right italic correction now (so that our parent won't correct us)
mBoundingMetrics.width = PR_MAX(0, lspace + width);
mBoundingMetrics.rightBearing = mBoundingMetrics.width;
}
nscoord dy = height - mBoundingMetrics.ascent;
nscoord dx = lspace;
mBoundingMetrics.ascent = height;
mBoundingMetrics.descent = depth;
aDesiredSize.ascent += dy;
aDesiredSize.width = mBoundingMetrics.width;
aDesiredSize.height += dy + depth - mBoundingMetrics.descent;
aDesiredSize.mBoundingMetrics = mBoundingMetrics;
mReference.x = 0;
mReference.y = aDesiredSize.ascent;
if (aPlaceOrigin) {
// Finish reflowing child frames, positioning their origins.
PositionRowChildFrames(dx, aDesiredSize.ascent);
}
return NS_OK;
}
/* virtual */ nsresult
nsMathMLmpaddedFrame::Place(nsRenderingContext& aRenderingContext,
bool aPlaceOrigin,
nsHTMLReflowMetrics& aDesiredSize)
{
nsresult rv =
nsMathMLContainerFrame::Place(aRenderingContext, false, aDesiredSize);
if (NS_MATHML_HAS_ERROR(mPresentationData.flags) || NS_FAILED(rv)) {
DidReflowChildren(GetFirstPrincipalChild());
return rv;
}
nscoord height = mBoundingMetrics.ascent;
nscoord depth = mBoundingMetrics.descent;
// The REC says:
//
// "The lspace attribute ('leading' space) specifies the horizontal location
// of the positioning point of the child content with respect to the
// positioning point of the mpadded element. By default they coincide, and
// therefore absolute values for lspace have the same effect as relative
// values."
//
// "MathML renderers should ensure that, except for the effects of the
// attributes, the relative spacing between the contents of the mpadded
// element and surrounding MathML elements would not be modified by replacing
// an mpadded element with an mrow element with the same content, even if
// linebreaking occurs within the mpadded element."
//
// (http://www.w3.org/TR/MathML/chapter3.html#presm.mpadded)
//
// "In those discussions, the terms leading and trailing are used to specify
// a side of an object when which side to use depends on the directionality;
// ie. leading means left in LTR but right in RTL."
// (http://www.w3.org/TR/MathML/chapter3.html#presm.bidi.math)
nscoord lspace = 0;
// In MathML3, "width" will be the bounding box width and "advancewidth" will
// refer "to the horizontal distance between the positioning point of the
// mpadded and the positioning point for the following content". MathML2
// doesn't make the distinction.
nscoord width = mBoundingMetrics.width;
nscoord voffset = 0;
int32_t pseudoUnit;
nscoord initialWidth = width;
// update width
pseudoUnit = (mWidthPseudoUnit == NS_MATHML_PSEUDO_UNIT_ITSELF)
? NS_MATHML_PSEUDO_UNIT_WIDTH : mWidthPseudoUnit;
UpdateValue(mWidthSign, pseudoUnit, mWidth,
mBoundingMetrics, width);
width = NS_MAX(0, width);
// update "height" (this is the ascent in the terminology of the REC)
pseudoUnit = (mHeightPseudoUnit == NS_MATHML_PSEUDO_UNIT_ITSELF)
? NS_MATHML_PSEUDO_UNIT_HEIGHT : mHeightPseudoUnit;
UpdateValue(mHeightSign, pseudoUnit, mHeight,
mBoundingMetrics, height);
height = NS_MAX(0, height);
// update "depth" (this is the descent in the terminology of the REC)
pseudoUnit = (mDepthPseudoUnit == NS_MATHML_PSEUDO_UNIT_ITSELF)
? NS_MATHML_PSEUDO_UNIT_DEPTH : mDepthPseudoUnit;
UpdateValue(mDepthSign, pseudoUnit, mDepth,
mBoundingMetrics, depth);
depth = NS_MAX(0, depth);
// update lspace
if (mLeadingSpacePseudoUnit != NS_MATHML_PSEUDO_UNIT_ITSELF) {
pseudoUnit = mLeadingSpacePseudoUnit;
UpdateValue(mLeadingSpaceSign, pseudoUnit, mLeadingSpace,
mBoundingMetrics, lspace);
}
// update voffset
if (mVerticalOffsetPseudoUnit != NS_MATHML_PSEUDO_UNIT_ITSELF) {
pseudoUnit = mVerticalOffsetPseudoUnit;
UpdateValue(mVerticalOffsetSign, pseudoUnit, mVerticalOffset,
mBoundingMetrics, voffset);
}
// do the padding now that we have everything
// The idea here is to maintain the invariant that <mpadded>...</mpadded> (i.e.,
// with no attributes) looks the same as <mrow>...</mrow>. But when there are
// attributes, tweak our metrics and move children to achieve the desired visual
// effects.
if ((NS_MATHML_IS_RTL(mPresentationData.flags) ?
mWidthSign : mLeadingSpaceSign) != NS_MATHML_SIGN_INVALID) {
// there was padding on the left. dismiss the left italic correction now
// (so that our parent won't correct us)
mBoundingMetrics.leftBearing = 0;
}
if ((NS_MATHML_IS_RTL(mPresentationData.flags) ?
mLeadingSpaceSign : mWidthSign) != NS_MATHML_SIGN_INVALID) {
// there was padding on the right. dismiss the right italic correction now
// (so that our parent won't correct us)
mBoundingMetrics.width = width;
mBoundingMetrics.rightBearing = mBoundingMetrics.width;
}
nscoord dy = height - mBoundingMetrics.ascent;
nscoord dx = NS_MATHML_IS_RTL(mPresentationData.flags) ?
width - initialWidth - lspace : lspace;
aDesiredSize.ascent += dy;
aDesiredSize.width = mBoundingMetrics.width;
aDesiredSize.height += dy + depth - mBoundingMetrics.descent;
mBoundingMetrics.ascent = height;
mBoundingMetrics.descent = depth;
aDesiredSize.mBoundingMetrics = mBoundingMetrics;
mReference.x = 0;
mReference.y = aDesiredSize.ascent;
if (aPlaceOrigin) {
// Finish reflowing child frames, positioning their origins.
PositionRowChildFrames(dx, aDesiredSize.ascent - voffset);
}
return NS_OK;
}
/* virtual */ nsresult
nsMathMLmencloseFrame::PlaceInternal(nsRenderingContext& aRenderingContext,
bool aPlaceOrigin,
nsHTMLReflowMetrics& aDesiredSize,
bool aWidthOnly)
{
///////////////
// Measure the size of our content using the base class to format like an
// inferred mrow.
nsHTMLReflowMetrics baseSize;
nsresult rv =
nsMathMLContainerFrame::Place(aRenderingContext, false, baseSize);
if (NS_MATHML_HAS_ERROR(mPresentationData.flags) || NS_FAILED(rv)) {
DidReflowChildren(GetFirstPrincipalChild());
return rv;
}
nsBoundingMetrics bmBase = baseSize.mBoundingMetrics;
nscoord dx_left = 0, dx_right = 0;
nsBoundingMetrics bmLongdivChar, bmRadicalChar;
nscoord radicalAscent = 0, radicalDescent = 0;
nscoord longdivAscent = 0, longdivDescent = 0;
nscoord psi = 0;
///////////////
// Thickness of bars and font metrics
nscoord onePixel = nsPresContext::CSSPixelsToAppUnits(1);
nscoord mEmHeight;
nsRefPtr<nsFontMetrics> fm;
nsLayoutUtils::GetFontMetricsForFrame(this, getter_AddRefs(fm));
aRenderingContext.SetFont(fm);
GetRuleThickness(aRenderingContext, fm, mRuleThickness);
GetEmHeight(fm, mEmHeight);
PRUnichar one = '1';
nsBoundingMetrics bmOne = aRenderingContext.GetBoundingMetrics(&one, 1);
///////////////
// General rules: the menclose element takes the size of the enclosed content.
// We add a padding when needed.
// determine padding & psi
nscoord padding = 3 * mRuleThickness;
nscoord delta = padding % onePixel;
if (delta)
padding += onePixel - delta; // round up
if (IsToDraw(NOTATION_LONGDIV) || IsToDraw(NOTATION_RADICAL)) {
nscoord phi;
// Rule 11, App. G, TeXbook
// psi = clearance between rule and content
if (NS_MATHML_IS_DISPLAYSTYLE(mPresentationData.flags))
phi = fm->XHeight();
else
phi = mRuleThickness;
psi = mRuleThickness + phi / 4;
delta = psi % onePixel;
if (delta)
psi += onePixel - delta; // round up
}
if (mRuleThickness < onePixel)
mRuleThickness = onePixel;
// Set horizontal parameters
if (IsToDraw(NOTATION_ROUNDEDBOX) ||
IsToDraw(NOTATION_TOP) ||
IsToDraw(NOTATION_LEFT) ||
IsToDraw(NOTATION_BOTTOM) ||
IsToDraw(NOTATION_CIRCLE))
dx_left = padding;
if (IsToDraw(NOTATION_ROUNDEDBOX) ||
IsToDraw(NOTATION_TOP) ||
IsToDraw(NOTATION_RIGHT) ||
IsToDraw(NOTATION_BOTTOM) ||
IsToDraw(NOTATION_CIRCLE))
dx_right = padding;
// Set vertical parameters
if (IsToDraw(NOTATION_RIGHT) ||
IsToDraw(NOTATION_LEFT) ||
IsToDraw(NOTATION_UPDIAGONALSTRIKE) ||
IsToDraw(NOTATION_DOWNDIAGONALSTRIKE) ||
IsToDraw(NOTATION_VERTICALSTRIKE) ||
IsToDraw(NOTATION_CIRCLE) ||
IsToDraw(NOTATION_ROUNDEDBOX) ||
IsToDraw(NOTATION_RADICAL) ||
IsToDraw(NOTATION_LONGDIV)) {
// set a minimal value for the base height
bmBase.ascent = NS_MAX(bmOne.ascent, bmBase.ascent);
bmBase.descent = NS_MAX(0, bmBase.descent);
}
mBoundingMetrics.ascent = bmBase.ascent;
mBoundingMetrics.descent = bmBase.descent;
if (IsToDraw(NOTATION_ROUNDEDBOX) ||
IsToDraw(NOTATION_TOP) ||
IsToDraw(NOTATION_LEFT) ||
IsToDraw(NOTATION_RIGHT) ||
IsToDraw(NOTATION_CIRCLE))
mBoundingMetrics.ascent += padding;
if (IsToDraw(NOTATION_ROUNDEDBOX) ||
IsToDraw(NOTATION_LEFT) ||
IsToDraw(NOTATION_RIGHT) ||
IsToDraw(NOTATION_BOTTOM) ||
IsToDraw(NOTATION_CIRCLE))
mBoundingMetrics.descent += padding;
///////////////
// circle notation: we don't want the ellipse to overlap the enclosed
// content. Hence, we need to increase the size of the bounding box by a
// factor of at least sqrt(2).
if (IsToDraw(NOTATION_CIRCLE)) {
double ratio = (sqrt(2.0) - 1.0) / 2.0;
nscoord padding2;
// Update horizontal parameters
padding2 = ratio * bmBase.width;
dx_left = NS_MAX(dx_left, padding2);
dx_right = NS_MAX(dx_right, padding2);
// Update vertical parameters
padding2 = ratio * (bmBase.ascent + bmBase.descent);
mBoundingMetrics.ascent = NS_MAX(mBoundingMetrics.ascent,
bmBase.ascent + padding2);
mBoundingMetrics.descent = NS_MAX(mBoundingMetrics.descent,
bmBase.descent + padding2);
}
///////////////
// longdiv notation:
if (IsToDraw(NOTATION_LONGDIV)) {
if (aWidthOnly) {
nscoord longdiv_width = mMathMLChar[mLongDivCharIndex].
GetMaxWidth(PresContext(), aRenderingContext);
// Update horizontal parameters
dx_left = NS_MAX(dx_left, longdiv_width);
} else {
// Stretch the parenthesis to the appropriate height if it is not
// big enough.
nsBoundingMetrics contSize = bmBase;
contSize.ascent = mRuleThickness;
contSize.descent = bmBase.ascent + bmBase.descent + psi;
// height(longdiv) should be >= height(base) + psi + mRuleThickness
mMathMLChar[mLongDivCharIndex].Stretch(PresContext(), aRenderingContext,
NS_STRETCH_DIRECTION_VERTICAL,
contSize, bmLongdivChar,
NS_STRETCH_LARGER, false);
mMathMLChar[mLongDivCharIndex].GetBoundingMetrics(bmLongdivChar);
// Update horizontal parameters
dx_left = NS_MAX(dx_left, bmLongdivChar.width);
// Update vertical parameters
longdivAscent = bmBase.ascent + psi + mRuleThickness;
longdivDescent = NS_MAX(bmBase.descent,
(bmLongdivChar.ascent + bmLongdivChar.descent -
longdivAscent));
mBoundingMetrics.ascent = NS_MAX(mBoundingMetrics.ascent,
longdivAscent);
mBoundingMetrics.descent = NS_MAX(mBoundingMetrics.descent,
longdivDescent);
}
}
///////////////
// radical notation:
if (IsToDraw(NOTATION_RADICAL)) {
nscoord *dx_leading =
NS_MATHML_IS_RTL(mPresentationData.flags) ? &dx_right : &dx_left;
if (aWidthOnly) {
nscoord radical_width = mMathMLChar[mRadicalCharIndex].
GetMaxWidth(PresContext(), aRenderingContext);
// Update horizontal parameters
*dx_leading = NS_MAX(*dx_leading, radical_width);
} else {
// Stretch the radical symbol to the appropriate height if it is not
// big enough.
nsBoundingMetrics contSize = bmBase;
contSize.ascent = mRuleThickness;
contSize.descent = bmBase.ascent + bmBase.descent + psi;
// height(radical) should be >= height(base) + psi + mRuleThickness
mMathMLChar[mRadicalCharIndex].Stretch(PresContext(), aRenderingContext,
NS_STRETCH_DIRECTION_VERTICAL,
contSize, bmRadicalChar,
NS_STRETCH_LARGER,
NS_MATHML_IS_RTL(mPresentationData.flags));
mMathMLChar[mRadicalCharIndex].GetBoundingMetrics(bmRadicalChar);
// Update horizontal parameters
*dx_leading = NS_MAX(*dx_leading, bmRadicalChar.width);
// Update vertical parameters
radicalAscent = bmBase.ascent + psi + mRuleThickness;
radicalDescent = NS_MAX(bmBase.descent,
(bmRadicalChar.ascent + bmRadicalChar.descent -
radicalAscent));
mBoundingMetrics.ascent = NS_MAX(mBoundingMetrics.ascent,
radicalAscent);
mBoundingMetrics.descent = NS_MAX(mBoundingMetrics.descent,
radicalDescent);
}
}
///////////////
//
if (IsToDraw(NOTATION_CIRCLE) ||
IsToDraw(NOTATION_ROUNDEDBOX) ||
(IsToDraw(NOTATION_LEFT) && IsToDraw(NOTATION_RIGHT))) {
// center the menclose around the content (horizontally)
dx_left = dx_right = NS_MAX(dx_left, dx_right);
}
///////////////
// The maximum size is now computed: set the remaining parameters
mBoundingMetrics.width = dx_left + bmBase.width + dx_right;
mBoundingMetrics.leftBearing = NS_MIN(0, dx_left + bmBase.leftBearing);
mBoundingMetrics.rightBearing =
NS_MAX(mBoundingMetrics.width, dx_left + bmBase.rightBearing);
aDesiredSize.width = mBoundingMetrics.width;
aDesiredSize.ascent = NS_MAX(mBoundingMetrics.ascent, baseSize.ascent);
aDesiredSize.height = aDesiredSize.ascent +
NS_MAX(mBoundingMetrics.descent, baseSize.height - baseSize.ascent);
if (IsToDraw(NOTATION_LONGDIV) || IsToDraw(NOTATION_RADICAL)) {
// get the leading to be left at the top of the resulting frame
// this seems more reliable than using fm->GetLeading() on suspicious
// fonts
nscoord leading = nscoord(0.2f * mEmHeight);
nscoord desiredSizeAscent = aDesiredSize.ascent;
nscoord desiredSizeDescent = aDesiredSize.height - aDesiredSize.ascent;
if (IsToDraw(NOTATION_LONGDIV)) {
desiredSizeAscent = NS_MAX(desiredSizeAscent,
longdivAscent + leading);
desiredSizeDescent = NS_MAX(desiredSizeDescent,
longdivDescent + mRuleThickness);
}
if (IsToDraw(NOTATION_RADICAL)) {
desiredSizeAscent = NS_MAX(desiredSizeAscent,
radicalAscent + leading);
desiredSizeDescent = NS_MAX(desiredSizeDescent,
radicalDescent + mRuleThickness);
}
aDesiredSize.ascent = desiredSizeAscent;
aDesiredSize.height = desiredSizeAscent + desiredSizeDescent;
}
if (IsToDraw(NOTATION_CIRCLE) ||
IsToDraw(NOTATION_ROUNDEDBOX) ||
(IsToDraw(NOTATION_TOP) && IsToDraw(NOTATION_BOTTOM))) {
// center the menclose around the content (vertically)
nscoord dy = NS_MAX(aDesiredSize.ascent - bmBase.ascent,
aDesiredSize.height - aDesiredSize.ascent -
bmBase.descent);
aDesiredSize.ascent = bmBase.ascent + dy;
aDesiredSize.height = aDesiredSize.ascent + bmBase.descent + dy;
}
// Update mBoundingMetrics ascent/descent
if (IsToDraw(NOTATION_TOP) ||
IsToDraw(NOTATION_RIGHT) ||
IsToDraw(NOTATION_LEFT) ||
IsToDraw(NOTATION_UPDIAGONALSTRIKE) ||
IsToDraw(NOTATION_DOWNDIAGONALSTRIKE) ||
IsToDraw(NOTATION_VERTICALSTRIKE) ||
IsToDraw(NOTATION_CIRCLE) ||
IsToDraw(NOTATION_ROUNDEDBOX))
mBoundingMetrics.ascent = aDesiredSize.ascent;
if (IsToDraw(NOTATION_BOTTOM) ||
IsToDraw(NOTATION_RIGHT) ||
IsToDraw(NOTATION_LEFT) ||
IsToDraw(NOTATION_UPDIAGONALSTRIKE) ||
IsToDraw(NOTATION_DOWNDIAGONALSTRIKE) ||
IsToDraw(NOTATION_VERTICALSTRIKE) ||
IsToDraw(NOTATION_CIRCLE) ||
IsToDraw(NOTATION_ROUNDEDBOX))
mBoundingMetrics.descent = aDesiredSize.height - aDesiredSize.ascent;
aDesiredSize.mBoundingMetrics = mBoundingMetrics;
mReference.x = 0;
mReference.y = aDesiredSize.ascent;
if (aPlaceOrigin) {
//////////////////
// Set position and size of MathMLChars
if (IsToDraw(NOTATION_LONGDIV))
mMathMLChar[mLongDivCharIndex].SetRect(nsRect(dx_left -
bmLongdivChar.width,
aDesiredSize.ascent -
longdivAscent,
bmLongdivChar.width,
bmLongdivChar.ascent +
bmLongdivChar.descent));
if (IsToDraw(NOTATION_RADICAL)) {
nscoord dx = NS_MATHML_IS_RTL(mPresentationData.flags) ?
dx_left + bmBase.width : dx_left - bmRadicalChar.width;
mMathMLChar[mRadicalCharIndex].SetRect(nsRect(dx,
aDesiredSize.ascent -
radicalAscent,
bmRadicalChar.width,
bmRadicalChar.ascent +
bmRadicalChar.descent));
}
mContentWidth = bmBase.width;
//////////////////
// Finish reflowing child frames
PositionRowChildFrames(dx_left, aDesiredSize.ascent);
}
return NS_OK;
}