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Diffstat (limited to 'layout/mathml/nsMathMLmencloseFrame.cpp')
| -rw-r--r-- | layout/mathml/nsMathMLmencloseFrame.cpp | 827 |
1 files changed, 827 insertions, 0 deletions
diff --git a/layout/mathml/nsMathMLmencloseFrame.cpp b/layout/mathml/nsMathMLmencloseFrame.cpp new file mode 100644 index 0000000000..1b8a03991b --- /dev/null +++ b/layout/mathml/nsMathMLmencloseFrame.cpp @@ -0,0 +1,827 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#include "nsMathMLmencloseFrame.h" + +#include "gfx2DGlue.h" +#include "gfxUtils.h" +#include "mozilla/dom/Document.h" +#include "mozilla/dom/Element.h" +#include "mozilla/PresShell.h" +#include "mozilla/StaticPrefs_mathml.h" +#include "mozilla/gfx/2D.h" +#include "mozilla/gfx/PathHelpers.h" +#include "nsLayoutUtils.h" +#include "nsPresContext.h" +#include "nsWhitespaceTokenizer.h" + +#include "nsDisplayList.h" +#include "gfxContext.h" +#include "nsMathMLChar.h" +#include <algorithm> + +using namespace mozilla; +using namespace mozilla::gfx; + +// +// <menclose> -- enclose content with a stretching symbol such +// as a long division sign. - implementation + +// longdiv: +// Unicode 5.1 assigns U+27CC to LONG DIVISION, but a right parenthesis +// renders better with current font support. +static const char16_t kLongDivChar = ')'; + +// radical: 'SQUARE ROOT' +static const char16_t kRadicalChar = 0x221A; + +// updiagonalstrike +static const uint8_t kArrowHeadSize = 10; + +// phasorangle +static const uint8_t kPhasorangleWidth = 8; + +nsIFrame* NS_NewMathMLmencloseFrame(PresShell* aPresShell, + ComputedStyle* aStyle) { + return new (aPresShell) + nsMathMLmencloseFrame(aStyle, aPresShell->GetPresContext()); +} + +NS_IMPL_FRAMEARENA_HELPERS(nsMathMLmencloseFrame) + +nsMathMLmencloseFrame::nsMathMLmencloseFrame(ComputedStyle* aStyle, + nsPresContext* aPresContext, + ClassID aID) + : nsMathMLContainerFrame(aStyle, aPresContext, aID), + mRuleThickness(0), + mRadicalRuleThickness(0), + mLongDivCharIndex(-1), + mRadicalCharIndex(-1), + mContentWidth(0) {} + +nsMathMLmencloseFrame::~nsMathMLmencloseFrame() = default; + +nsresult nsMathMLmencloseFrame::AllocateMathMLChar(nsMencloseNotation mask) { + // Is the char already allocated? + if ((mask == NOTATION_LONGDIV && mLongDivCharIndex >= 0) || + (mask == NOTATION_RADICAL && mRadicalCharIndex >= 0)) + return NS_OK; + + // No need to track the ComputedStyle given to our MathML chars. + // The Style System will use Get/SetAdditionalComputedStyle() to keep it + // up-to-date if dynamic changes arise. + uint32_t i = mMathMLChar.Length(); + nsAutoString Char; + + // XXX(Bug 1631371) Check if this should use a fallible operation as it + // pretended earlier, or change the return type to void. + mMathMLChar.AppendElement(); + + if (mask == NOTATION_LONGDIV) { + Char.Assign(kLongDivChar); + mLongDivCharIndex = i; + } else if (mask == NOTATION_RADICAL) { + Char.Assign(kRadicalChar); + mRadicalCharIndex = i; + } + + mMathMLChar[i].SetData(Char); + mMathMLChar[i].SetComputedStyle(Style()); + + return NS_OK; +} + +/* + * Add a notation to draw, if the argument is the name of a known notation. + * @param aNotation string name of a notation + */ +nsresult nsMathMLmencloseFrame::AddNotation(const nsAString& aNotation) { + nsresult rv; + + if (aNotation.EqualsLiteral("longdiv")) { + rv = AllocateMathMLChar(NOTATION_LONGDIV); + NS_ENSURE_SUCCESS(rv, rv); + mNotationsToDraw += NOTATION_LONGDIV; + } else if (aNotation.EqualsLiteral("actuarial")) { + mNotationsToDraw += NOTATION_RIGHT; + mNotationsToDraw += NOTATION_TOP; + } else if (aNotation.EqualsLiteral("box")) { + mNotationsToDraw += NOTATION_LEFT; + mNotationsToDraw += NOTATION_RIGHT; + mNotationsToDraw += NOTATION_TOP; + mNotationsToDraw += NOTATION_BOTTOM; + } else if (aNotation.EqualsLiteral("roundedbox")) { + mNotationsToDraw += NOTATION_ROUNDEDBOX; + } else if (aNotation.EqualsLiteral("circle")) { + mNotationsToDraw += NOTATION_CIRCLE; + } else if (aNotation.EqualsLiteral("left")) { + mNotationsToDraw += NOTATION_LEFT; + } else if (aNotation.EqualsLiteral("right")) { + mNotationsToDraw += NOTATION_RIGHT; + } else if (aNotation.EqualsLiteral("top")) { + mNotationsToDraw += NOTATION_TOP; + } else if (aNotation.EqualsLiteral("bottom")) { + mNotationsToDraw += NOTATION_BOTTOM; + } else if (aNotation.EqualsLiteral("updiagonalstrike")) { + mNotationsToDraw += NOTATION_UPDIAGONALSTRIKE; + } else if (aNotation.EqualsLiteral("updiagonalarrow")) { + mNotationsToDraw += NOTATION_UPDIAGONALARROW; + } else if (aNotation.EqualsLiteral("downdiagonalstrike")) { + mNotationsToDraw += NOTATION_DOWNDIAGONALSTRIKE; + } else if (aNotation.EqualsLiteral("verticalstrike")) { + mNotationsToDraw += NOTATION_VERTICALSTRIKE; + } else if (aNotation.EqualsLiteral("horizontalstrike")) { + mNotationsToDraw += NOTATION_HORIZONTALSTRIKE; + } else if (aNotation.EqualsLiteral("madruwb")) { + mNotationsToDraw += NOTATION_RIGHT; + mNotationsToDraw += NOTATION_BOTTOM; + } else if (aNotation.EqualsLiteral("phasorangle")) { + mNotationsToDraw += NOTATION_BOTTOM; + mNotationsToDraw += NOTATION_PHASORANGLE; + } + + return NS_OK; +} + +/* + * Initialize the list of notations to draw + */ +void nsMathMLmencloseFrame::InitNotations() { + MarkNeedsDisplayItemRebuild(); + mNotationsToDraw.clear(); + mLongDivCharIndex = mRadicalCharIndex = -1; + mMathMLChar.Clear(); + + nsAutoString value; + + if (mContent->AsElement()->GetAttr(nsGkAtoms::notation_, value)) { + // parse the notation attribute + nsWhitespaceTokenizer tokenizer(value); + + while (tokenizer.hasMoreTokens()) AddNotation(tokenizer.nextToken()); + + if (IsToDraw(NOTATION_UPDIAGONALARROW)) { + // For <menclose notation="updiagonalstrike updiagonalarrow">, if + // the two notations are drawn then the strike line may cause the point of + // the arrow to be too wide. Hence we will only draw the updiagonalarrow + // and the arrow shaft may be thought to be the updiagonalstrike. + mNotationsToDraw -= NOTATION_UPDIAGONALSTRIKE; + } + } else { + // default: longdiv + if (NS_FAILED(AllocateMathMLChar(NOTATION_LONGDIV))) return; + mNotationsToDraw += NOTATION_LONGDIV; + } +} + +NS_IMETHODIMP +nsMathMLmencloseFrame::InheritAutomaticData(nsIFrame* aParent) { + // let the base class get the default from our parent + nsMathMLContainerFrame::InheritAutomaticData(aParent); + + mPresentationData.flags |= NS_MATHML_STRETCH_ALL_CHILDREN_VERTICALLY; + + InitNotations(); + + return NS_OK; +} + +NS_IMETHODIMP +nsMathMLmencloseFrame::TransmitAutomaticData() { + if (IsToDraw(NOTATION_RADICAL)) { + // The TeXBook (Ch 17. p.141) says that \sqrt is cramped + UpdatePresentationDataFromChildAt(0, -1, NS_MATHML_COMPRESSED, + NS_MATHML_COMPRESSED); + } + + return NS_OK; +} + +void nsMathMLmencloseFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder, + const nsDisplayListSet& aLists) { + ///////////// + // paint the menclosed content + nsMathMLContainerFrame::BuildDisplayList(aBuilder, aLists); + + if (NS_MATHML_HAS_ERROR(mPresentationData.flags)) return; + + nsRect mencloseRect = nsIFrame::GetRect(); + mencloseRect.x = mencloseRect.y = 0; + + if (IsToDraw(NOTATION_RADICAL)) { + mMathMLChar[mRadicalCharIndex].Display(aBuilder, this, aLists, 0); + + nsRect rect; + mMathMLChar[mRadicalCharIndex].GetRect(rect); + rect.MoveBy(StyleVisibility()->mDirection == StyleDirection::Rtl + ? -mContentWidth + : rect.width, + 0); + rect.SizeTo(mContentWidth, mRadicalRuleThickness); + DisplayBar(aBuilder, this, rect, aLists, NOTATION_RADICAL); + } + + if (IsToDraw(NOTATION_PHASORANGLE)) { + DisplayNotation(aBuilder, this, mencloseRect, aLists, mRuleThickness, + NOTATION_PHASORANGLE); + } + + if (IsToDraw(NOTATION_LONGDIV)) { + mMathMLChar[mLongDivCharIndex].Display(aBuilder, this, aLists, 1); + + nsRect rect; + mMathMLChar[mLongDivCharIndex].GetRect(rect); + rect.SizeTo(rect.width + mContentWidth, mRuleThickness); + DisplayBar(aBuilder, this, rect, aLists, NOTATION_LONGDIV); + } + + if (IsToDraw(NOTATION_TOP)) { + nsRect rect(0, 0, mencloseRect.width, mRuleThickness); + DisplayBar(aBuilder, this, rect, aLists, NOTATION_TOP); + } + + if (IsToDraw(NOTATION_BOTTOM)) { + nsRect rect(0, mencloseRect.height - mRuleThickness, mencloseRect.width, + mRuleThickness); + DisplayBar(aBuilder, this, rect, aLists, NOTATION_BOTTOM); + } + + if (IsToDraw(NOTATION_LEFT)) { + nsRect rect(0, 0, mRuleThickness, mencloseRect.height); + DisplayBar(aBuilder, this, rect, aLists, NOTATION_LEFT); + } + + if (IsToDraw(NOTATION_RIGHT)) { + nsRect rect(mencloseRect.width - mRuleThickness, 0, mRuleThickness, + mencloseRect.height); + DisplayBar(aBuilder, this, rect, aLists, NOTATION_RIGHT); + } + + if (IsToDraw(NOTATION_ROUNDEDBOX)) { + DisplayNotation(aBuilder, this, mencloseRect, aLists, mRuleThickness, + NOTATION_ROUNDEDBOX); + } + + if (IsToDraw(NOTATION_CIRCLE)) { + DisplayNotation(aBuilder, this, mencloseRect, aLists, mRuleThickness, + NOTATION_CIRCLE); + } + + if (IsToDraw(NOTATION_UPDIAGONALSTRIKE)) { + DisplayNotation(aBuilder, this, mencloseRect, aLists, mRuleThickness, + NOTATION_UPDIAGONALSTRIKE); + } + + if (IsToDraw(NOTATION_UPDIAGONALARROW)) { + DisplayNotation(aBuilder, this, mencloseRect, aLists, mRuleThickness, + NOTATION_UPDIAGONALARROW); + } + + if (IsToDraw(NOTATION_DOWNDIAGONALSTRIKE)) { + DisplayNotation(aBuilder, this, mencloseRect, aLists, mRuleThickness, + NOTATION_DOWNDIAGONALSTRIKE); + } + + if (IsToDraw(NOTATION_HORIZONTALSTRIKE)) { + nsRect rect(0, mencloseRect.height / 2 - mRuleThickness / 2, + mencloseRect.width, mRuleThickness); + DisplayBar(aBuilder, this, rect, aLists, NOTATION_HORIZONTALSTRIKE); + } + + if (IsToDraw(NOTATION_VERTICALSTRIKE)) { + nsRect rect(mencloseRect.width / 2 - mRuleThickness / 2, 0, mRuleThickness, + mencloseRect.height); + DisplayBar(aBuilder, this, rect, aLists, NOTATION_VERTICALSTRIKE); + } +} + +/* virtual */ +nsresult nsMathMLmencloseFrame::MeasureForWidth(DrawTarget* aDrawTarget, + ReflowOutput& aDesiredSize) { + return PlaceInternal(aDrawTarget, false, aDesiredSize, true); +} + +/* virtual */ +nsresult nsMathMLmencloseFrame::Place(DrawTarget* aDrawTarget, + bool aPlaceOrigin, + ReflowOutput& aDesiredSize) { + return PlaceInternal(aDrawTarget, aPlaceOrigin, aDesiredSize, false); +} + +/* virtual */ +nsresult nsMathMLmencloseFrame::PlaceInternal(DrawTarget* aDrawTarget, + bool aPlaceOrigin, + ReflowOutput& aDesiredSize, + bool aWidthOnly) { + /////////////// + // Measure the size of our content using the base class to format like an + // inferred mrow. + ReflowOutput baseSize(aDesiredSize.GetWritingMode()); + nsresult rv = nsMathMLContainerFrame::Place(aDrawTarget, false, baseSize); + + if (NS_MATHML_HAS_ERROR(mPresentationData.flags) || NS_FAILED(rv)) { + DidReflowChildren(PrincipalChildList().FirstChild()); + 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; + nscoord leading = 0; + + /////////////// + // Thickness of bars and font metrics + nscoord onePixel = nsPresContext::CSSPixelsToAppUnits(1); + + float fontSizeInflation = nsLayoutUtils::FontSizeInflationFor(this); + RefPtr<nsFontMetrics> fm = + nsLayoutUtils::GetFontMetricsForFrame(this, fontSizeInflation); + GetRuleThickness(aDrawTarget, fm, mRuleThickness); + if (mRuleThickness < onePixel) { + mRuleThickness = onePixel; + } + + char16_t one = '1'; + nsBoundingMetrics bmOne = + nsLayoutUtils::AppUnitBoundsOfString(&one, 1, *fm, aDrawTarget); + + /////////////// + // 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)) { + GetRadicalParameters(fm, StyleFont()->mMathStyle == StyleMathStyle::Normal, + mRadicalRuleThickness, leading, psi); + + // make sure that the rule appears on on screen + if (mRadicalRuleThickness < onePixel) { + mRadicalRuleThickness = onePixel; + } + + // adjust clearance psi to get an exact number of pixels -- this + // gives a nicer & uniform look on stacked radicals (bug 130282) + delta = psi % onePixel; + if (delta) { + psi += onePixel - delta; // round up + } + } + + // 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_UPDIAGONALARROW) || + IsToDraw(NOTATION_DOWNDIAGONALSTRIKE) || + IsToDraw(NOTATION_VERTICALSTRIKE) || IsToDraw(NOTATION_CIRCLE) || + IsToDraw(NOTATION_ROUNDEDBOX) || IsToDraw(NOTATION_RADICAL) || + IsToDraw(NOTATION_LONGDIV) || IsToDraw(NOTATION_PHASORANGLE)) { + // set a minimal value for the base height + bmBase.ascent = std::max(bmOne.ascent, bmBase.ascent); + bmBase.descent = std::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; + + /////////////// + // phasorangle notation + if (IsToDraw(NOTATION_PHASORANGLE)) { + nscoord phasorangleWidth = kPhasorangleWidth * mRuleThickness; + // Update horizontal parameters + dx_left = std::max(dx_left, phasorangleWidth); + } + + /////////////// + // updiagonal arrow notation. We need enough space at the top right corner to + // draw the arrow head. + if (IsToDraw(NOTATION_UPDIAGONALARROW)) { + // This is an estimate, see nsDisplayNotation::Paint for the exact head size + nscoord arrowHeadSize = kArrowHeadSize * mRuleThickness; + + // We want that the arrow shaft strikes the menclose content and that the + // arrow head does not overlap with that content. Hence we add some space + // on the right. We don't add space on the top but only ensure that the + // ascent is large enough. + dx_right = std::max(dx_right, arrowHeadSize); + mBoundingMetrics.ascent = std::max(mBoundingMetrics.ascent, arrowHeadSize); + } + + /////////////// + // 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 = std::max(dx_left, padding2); + dx_right = std::max(dx_right, padding2); + + // Update vertical parameters + padding2 = ratio * (bmBase.ascent + bmBase.descent); + + mBoundingMetrics.ascent = + std::max(mBoundingMetrics.ascent, bmBase.ascent + padding2); + mBoundingMetrics.descent = + std::max(mBoundingMetrics.descent, bmBase.descent + padding2); + } + + /////////////// + // longdiv notation: + if (IsToDraw(NOTATION_LONGDIV)) { + if (aWidthOnly) { + nscoord longdiv_width = mMathMLChar[mLongDivCharIndex].GetMaxWidth( + this, aDrawTarget, fontSizeInflation); + + // Update horizontal parameters + dx_left = std::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( + this, aDrawTarget, fontSizeInflation, NS_STRETCH_DIRECTION_VERTICAL, + contSize, bmLongdivChar, NS_STRETCH_LARGER, false); + mMathMLChar[mLongDivCharIndex].GetBoundingMetrics(bmLongdivChar); + + // Update horizontal parameters + dx_left = std::max(dx_left, bmLongdivChar.width); + + // Update vertical parameters + longdivAscent = bmBase.ascent + psi + mRuleThickness; + longdivDescent = std::max( + bmBase.descent, + (bmLongdivChar.ascent + bmLongdivChar.descent - longdivAscent)); + + mBoundingMetrics.ascent = + std::max(mBoundingMetrics.ascent, longdivAscent); + mBoundingMetrics.descent = + std::max(mBoundingMetrics.descent, longdivDescent); + } + } + + /////////////// + // radical notation: + if (IsToDraw(NOTATION_RADICAL)) { + nscoord* dx_leading = StyleVisibility()->mDirection == StyleDirection::Rtl + ? &dx_right + : &dx_left; + + if (aWidthOnly) { + nscoord radical_width = mMathMLChar[mRadicalCharIndex].GetMaxWidth( + this, aDrawTarget, fontSizeInflation); + + // Update horizontal parameters + *dx_leading = std::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 = mRadicalRuleThickness; + contSize.descent = bmBase.ascent + bmBase.descent + psi; + + // height(radical) should be >= height(base) + psi + mRadicalRuleThickness + mMathMLChar[mRadicalCharIndex].Stretch( + this, aDrawTarget, fontSizeInflation, NS_STRETCH_DIRECTION_VERTICAL, + contSize, bmRadicalChar, NS_STRETCH_LARGER, + StyleVisibility()->mDirection == StyleDirection::Rtl); + mMathMLChar[mRadicalCharIndex].GetBoundingMetrics(bmRadicalChar); + + // Update horizontal parameters + *dx_leading = std::max(*dx_leading, bmRadicalChar.width); + + // Update vertical parameters + radicalAscent = bmBase.ascent + psi + mRadicalRuleThickness; + radicalDescent = std::max( + bmBase.descent, + (bmRadicalChar.ascent + bmRadicalChar.descent - radicalAscent)); + + mBoundingMetrics.ascent = + std::max(mBoundingMetrics.ascent, radicalAscent); + mBoundingMetrics.descent = + std::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 = std::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 = std::min(0, dx_left + bmBase.leftBearing); + mBoundingMetrics.rightBearing = + std::max(mBoundingMetrics.width, dx_left + bmBase.rightBearing); + + aDesiredSize.Width() = mBoundingMetrics.width; + + aDesiredSize.SetBlockStartAscent( + std::max(mBoundingMetrics.ascent, baseSize.BlockStartAscent())); + aDesiredSize.Height() = + aDesiredSize.BlockStartAscent() + + std::max(mBoundingMetrics.descent, + baseSize.Height() - baseSize.BlockStartAscent()); + + if (IsToDraw(NOTATION_LONGDIV) || IsToDraw(NOTATION_RADICAL)) { + nscoord desiredSizeAscent = aDesiredSize.BlockStartAscent(); + nscoord desiredSizeDescent = + aDesiredSize.Height() - aDesiredSize.BlockStartAscent(); + + if (IsToDraw(NOTATION_LONGDIV)) { + desiredSizeAscent = std::max(desiredSizeAscent, longdivAscent + leading); + desiredSizeDescent = + std::max(desiredSizeDescent, longdivDescent + mRuleThickness); + } + + if (IsToDraw(NOTATION_RADICAL)) { + desiredSizeAscent = std::max(desiredSizeAscent, radicalAscent + leading); + desiredSizeDescent = + std::max(desiredSizeDescent, radicalDescent + mRadicalRuleThickness); + } + + aDesiredSize.SetBlockStartAscent(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 = std::max(aDesiredSize.BlockStartAscent() - bmBase.ascent, + aDesiredSize.Height() - + aDesiredSize.BlockStartAscent() - bmBase.descent); + + aDesiredSize.SetBlockStartAscent(bmBase.ascent + dy); + aDesiredSize.Height() = + aDesiredSize.BlockStartAscent() + bmBase.descent + dy; + } + + // Update mBoundingMetrics ascent/descent + if (IsToDraw(NOTATION_TOP) || IsToDraw(NOTATION_RIGHT) || + IsToDraw(NOTATION_LEFT) || IsToDraw(NOTATION_UPDIAGONALSTRIKE) || + IsToDraw(NOTATION_UPDIAGONALARROW) || + IsToDraw(NOTATION_DOWNDIAGONALSTRIKE) || + IsToDraw(NOTATION_VERTICALSTRIKE) || IsToDraw(NOTATION_CIRCLE) || + IsToDraw(NOTATION_ROUNDEDBOX)) + mBoundingMetrics.ascent = aDesiredSize.BlockStartAscent(); + + if (IsToDraw(NOTATION_BOTTOM) || IsToDraw(NOTATION_RIGHT) || + IsToDraw(NOTATION_LEFT) || IsToDraw(NOTATION_UPDIAGONALSTRIKE) || + IsToDraw(NOTATION_UPDIAGONALARROW) || + IsToDraw(NOTATION_DOWNDIAGONALSTRIKE) || + IsToDraw(NOTATION_VERTICALSTRIKE) || IsToDraw(NOTATION_CIRCLE) || + IsToDraw(NOTATION_ROUNDEDBOX)) + mBoundingMetrics.descent = + aDesiredSize.Height() - aDesiredSize.BlockStartAscent(); + + // phasorangle notation: + // move up from the bottom by the angled line height + if (IsToDraw(NOTATION_PHASORANGLE)) + mBoundingMetrics.ascent = std::max( + mBoundingMetrics.ascent, + 2 * kPhasorangleWidth * mRuleThickness - mBoundingMetrics.descent); + + aDesiredSize.mBoundingMetrics = mBoundingMetrics; + + mReference.x = 0; + mReference.y = aDesiredSize.BlockStartAscent(); + + if (aPlaceOrigin) { + ////////////////// + // Set position and size of MathMLChars + if (IsToDraw(NOTATION_LONGDIV)) + mMathMLChar[mLongDivCharIndex].SetRect(nsRect( + dx_left - bmLongdivChar.width, + aDesiredSize.BlockStartAscent() - longdivAscent, bmLongdivChar.width, + bmLongdivChar.ascent + bmLongdivChar.descent)); + + if (IsToDraw(NOTATION_RADICAL)) { + nscoord dx = (StyleVisibility()->mDirection == StyleDirection::Rtl + ? dx_left + bmBase.width + : dx_left - bmRadicalChar.width); + + mMathMLChar[mRadicalCharIndex].SetRect(nsRect( + dx, aDesiredSize.BlockStartAscent() - radicalAscent, + bmRadicalChar.width, bmRadicalChar.ascent + bmRadicalChar.descent)); + } + + mContentWidth = bmBase.width; + + ////////////////// + // Finish reflowing child frames + PositionRowChildFrames(dx_left, aDesiredSize.BlockStartAscent()); + } + + return NS_OK; +} + +nscoord nsMathMLmencloseFrame::FixInterFrameSpacing( + ReflowOutput& aDesiredSize) { + nscoord gap = nsMathMLContainerFrame::FixInterFrameSpacing(aDesiredSize); + if (!gap) return 0; + + // Move the MathML characters + nsRect rect; + for (uint32_t i = 0; i < mMathMLChar.Length(); i++) { + mMathMLChar[i].GetRect(rect); + rect.MoveBy(gap, 0); + mMathMLChar[i].SetRect(rect); + } + + return gap; +} + +nsresult nsMathMLmencloseFrame::AttributeChanged(int32_t aNameSpaceID, + nsAtom* aAttribute, + int32_t aModType) { + if (aAttribute == nsGkAtoms::notation_) { + InitNotations(); + } + + return nsMathMLContainerFrame::AttributeChanged(aNameSpaceID, aAttribute, + aModType); +} + +void nsMathMLmencloseFrame::DidSetComputedStyle(ComputedStyle* aOldStyle) { + nsMathMLContainerFrame::DidSetComputedStyle(aOldStyle); + for (auto& ch : mMathMLChar) { + ch.SetComputedStyle(Style()); + } +} + +////////////////// + +namespace mozilla { + +class nsDisplayNotation final : public nsPaintedDisplayItem { + public: + nsDisplayNotation(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame, + const nsRect& aRect, nscoord aThickness, + nsMencloseNotation aType) + : nsPaintedDisplayItem(aBuilder, aFrame), + mRect(aRect), + mThickness(aThickness), + mType(aType) { + MOZ_COUNT_CTOR(nsDisplayNotation); + } + MOZ_COUNTED_DTOR_OVERRIDE(nsDisplayNotation) + + virtual void Paint(nsDisplayListBuilder* aBuilder, gfxContext* aCtx) override; + NS_DISPLAY_DECL_NAME("MathMLMencloseNotation", TYPE_MATHML_MENCLOSE_NOTATION) + + private: + nsRect mRect; + nscoord mThickness; + nsMencloseNotation mType; +}; + +void nsDisplayNotation::Paint(nsDisplayListBuilder* aBuilder, + gfxContext* aCtx) { + DrawTarget& aDrawTarget = *aCtx->GetDrawTarget(); + nsPresContext* presContext = mFrame->PresContext(); + + Float strokeWidth = presContext->AppUnitsToGfxUnits(mThickness); + + Rect rect = NSRectToRect(mRect + ToReferenceFrame(), + presContext->AppUnitsPerDevPixel()); + rect.Deflate(strokeWidth / 2.f); + + ColorPattern color(ToDeviceColor( + mFrame->GetVisitedDependentColor(&nsStyleText::mWebkitTextFillColor))); + + StrokeOptions strokeOptions(strokeWidth); + + switch (mType) { + case NOTATION_CIRCLE: { + RefPtr<Path> ellipse = + MakePathForEllipse(aDrawTarget, rect.Center(), rect.Size()); + aDrawTarget.Stroke(ellipse, color, strokeOptions); + return; + } + case NOTATION_ROUNDEDBOX: { + Float radius = 3 * strokeWidth; + RectCornerRadii radii(radius, radius); + RefPtr<Path> roundedRect = + MakePathForRoundedRect(aDrawTarget, rect, radii, true); + aDrawTarget.Stroke(roundedRect, color, strokeOptions); + return; + } + case NOTATION_UPDIAGONALSTRIKE: { + aDrawTarget.StrokeLine(rect.BottomLeft(), rect.TopRight(), color, + strokeOptions); + return; + } + case NOTATION_DOWNDIAGONALSTRIKE: { + aDrawTarget.StrokeLine(rect.TopLeft(), rect.BottomRight(), color, + strokeOptions); + return; + } + case NOTATION_UPDIAGONALARROW: { + // Compute some parameters to draw the updiagonalarrow. The values below + // are taken from MathJax's HTML-CSS output. + Float W = rect.Width(); + gfxFloat H = rect.Height(); + Float l = sqrt(W * W + H * H); + Float f = Float(kArrowHeadSize) * strokeWidth / l; + Float w = W * f; + gfxFloat h = H * f; + + // Draw the arrow shaft + aDrawTarget.StrokeLine(rect.BottomLeft(), + rect.TopRight() + Point(-.7 * w, .7 * h), color, + strokeOptions); + + // Draw the arrow head + RefPtr<PathBuilder> builder = aDrawTarget.CreatePathBuilder(); + builder->MoveTo(rect.TopRight()); + builder->LineTo( + rect.TopRight() + + Point(-w - .4 * h, std::max(-strokeWidth / 2.0, h - .4 * w))); + builder->LineTo(rect.TopRight() + Point(-.7 * w, .7 * h)); + builder->LineTo( + rect.TopRight() + + Point(std::min(strokeWidth / 2.0, -w + .4 * h), h + .4 * w)); + builder->Close(); + RefPtr<Path> path = builder->Finish(); + aDrawTarget.Fill(path, color); + return; + } + case NOTATION_PHASORANGLE: { + // Compute some parameters to draw the angled line, + // that uses a slope of 2 (angle = tan^-1(2)). + // H = w * tan(angle) = w * 2 + Float w = Float(kPhasorangleWidth) * strokeWidth; + Float H = 2 * w; + + // Draw the angled line + aDrawTarget.StrokeLine(rect.BottomLeft(), + rect.BottomLeft() + Point(w, -H), color, + strokeOptions); + return; + } + default: + MOZ_ASSERT_UNREACHABLE( + "This notation can not be drawn using " + "nsDisplayNotation"); + } +} + +} // namespace mozilla + +void nsMathMLmencloseFrame::DisplayNotation(nsDisplayListBuilder* aBuilder, + nsIFrame* aFrame, + const nsRect& aRect, + const nsDisplayListSet& aLists, + nscoord aThickness, + nsMencloseNotation aType) { + if (!aFrame->StyleVisibility()->IsVisible() || aRect.IsEmpty() || + aThickness <= 0) + return; + + const uint16_t index = aType; + aLists.Content()->AppendNewToTopWithIndex<nsDisplayNotation>( + aBuilder, aFrame, index, aRect, aThickness, aType); +} |