/* 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; }