Remove MathML (part 3 of many)

Source/core/rendering/mathml/RenderMathMLRoot.cpp

Index: Source/core/rendering/mathml/RenderMathMLRoot.cpp
diff --git a/Source/core/rendering/mathml/RenderMathMLRoot.cpp b/Source/core/rendering/mathml/RenderMathMLRoot.cpp
deleted file mode 100644
index 8aa54545011911e66eb7247ec3e04e62b3b63908..0000000000000000000000000000000000000000
--- a/Source/core/rendering/mathml/RenderMathMLRoot.cpp
+++ /dev/null
@@ -1,321 +0,0 @@
-/*
- * Copyright (C) 2009 Alex Milowski (alex@milowski.com). All rights reserved.
- * Copyright (C) 2010 François Sausset (sausset@gmail.com). All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include "config.h"
-
-#if ENABLE(MATHML)
-
-#include "core/rendering/mathml/RenderMathMLRoot.h"
-
-#include "core/platform/graphics/GraphicsContext.h"
-#include "core/rendering/PaintInfo.h"
-#include "core/rendering/mathml/RenderMathMLRow.h"
-
-using namespace std;
-
-namespace WebCore {
-    
-// FIXME: This whole file should be changed to work with various writing modes. See https://bugs.webkit.org/show_bug.cgi?id=48951.
-
-// Threshold above which the radical shape is modified to look nice with big bases (em)
-const float gThresholdBaseHeightEms = 1.5f;
-// Normal width of the front of the radical sign, before the base & overbar (em)
-const float gFrontWidthEms = 0.75f;
-// Gap between the base and overbar (em)
-const float gSpaceAboveEms = 0.2f;
-// Horizontal position of the bottom point of the radical (* frontWidth)
-const float gRadicalBottomPointXFront = 0.5f;
-// Lower the radical sign's bottom point (px)
-const int gRadicalBottomPointLower = 3;
-// Horizontal position of the top left point of the radical "dip" (* frontWidth)
-const float gRadicalDipLeftPointXFront = 0.8f;
-// Vertical position of the top left point of a sqrt radical "dip" (* baseHeight)
-const float gSqrtRadicalDipLeftPointYPos = 0.5f;
-// Vertical position of the top left point of an nth root radical "dip" (* baseHeight)
-const float gRootRadicalDipLeftPointYPos = 0.625f;
-// Vertical shift of the left end point of the radical (em)
-const float gRadicalLeftEndYShiftEms = 0.05f;
-// Additional bottom root padding if baseHeight > threshold (em)
-const float gBigRootBottomPaddingEms = 0.2f;
-
-// Radical line thickness (em)
-const float gRadicalLineThicknessEms = 0.02f;
-// Radical thick line thickness (em)
-const float gRadicalThickLineThicknessEms = 0.1f;
-    
-RenderMathMLRoot::RenderMathMLRoot(Element* element)
-    : RenderMathMLBlock(element)
-    , m_intrinsicPaddingBefore(0)
-    , m_intrinsicPaddingAfter(0)
-    , m_intrinsicPaddingStart(0)
-    , m_intrinsicPaddingEnd(0)
-{
-}
-
-LayoutUnit RenderMathMLRoot::paddingTop() const
-{
-    LayoutUnit result = computedCSSPaddingTop();
-    switch (style()->writingMode()) {
-    case TopToBottomWritingMode:
-        return result + m_intrinsicPaddingBefore;
-    case BottomToTopWritingMode:
-        return result + m_intrinsicPaddingAfter;
-    case LeftToRightWritingMode:
-    case RightToLeftWritingMode:
-        return result + (style()->isLeftToRightDirection() ? m_intrinsicPaddingStart : m_intrinsicPaddingEnd);
-    }
-    ASSERT_NOT_REACHED();
-    return result;
-}
-
-LayoutUnit RenderMathMLRoot::paddingBottom() const
-{
-    LayoutUnit result = computedCSSPaddingBottom();
-    switch (style()->writingMode()) {
-    case TopToBottomWritingMode:
-        return result + m_intrinsicPaddingAfter;
-    case BottomToTopWritingMode:
-        return result + m_intrinsicPaddingBefore;
-    case LeftToRightWritingMode:
-    case RightToLeftWritingMode:
-        return result + (style()->isLeftToRightDirection() ? m_intrinsicPaddingEnd : m_intrinsicPaddingStart);
-    }
-    ASSERT_NOT_REACHED();
-    return result;
-}
-
-LayoutUnit RenderMathMLRoot::paddingLeft() const
-{
-    LayoutUnit result = computedCSSPaddingLeft();
-    switch (style()->writingMode()) {
-    case LeftToRightWritingMode:
-        return result + m_intrinsicPaddingBefore;
-    case RightToLeftWritingMode:
-        return result + m_intrinsicPaddingAfter;
-    case TopToBottomWritingMode:
-    case BottomToTopWritingMode:
-        return result + (style()->isLeftToRightDirection() ? m_intrinsicPaddingStart : m_intrinsicPaddingEnd);
-    }
-    ASSERT_NOT_REACHED();
-    return result;
-}
-
-LayoutUnit RenderMathMLRoot::paddingRight() const
-{
-    LayoutUnit result = computedCSSPaddingRight();
-    switch (style()->writingMode()) {
-    case RightToLeftWritingMode:
-        return result + m_intrinsicPaddingBefore;
-    case LeftToRightWritingMode:
-        return result + m_intrinsicPaddingAfter;
-    case TopToBottomWritingMode:
-    case BottomToTopWritingMode:
-        return result + (style()->isLeftToRightDirection() ? m_intrinsicPaddingEnd : m_intrinsicPaddingStart);
-    }
-    ASSERT_NOT_REACHED();
-    return result;
-}
-
-LayoutUnit RenderMathMLRoot::paddingBefore() const
-{
-    return computedCSSPaddingBefore() + m_intrinsicPaddingBefore;
-}
-
-LayoutUnit RenderMathMLRoot::paddingAfter() const
-{
-    return computedCSSPaddingAfter() + m_intrinsicPaddingAfter;
-}
-
-LayoutUnit RenderMathMLRoot::paddingStart() const
-{
-    return computedCSSPaddingStart() + m_intrinsicPaddingStart;
-}
-
-LayoutUnit RenderMathMLRoot::paddingEnd() const
-{
-    return computedCSSPaddingEnd() + m_intrinsicPaddingEnd;
-}
-
-void RenderMathMLRoot::addChild(RenderObject* newChild, RenderObject* beforeChild)
-{
-    // Insert an implicit <mrow> for <mroot> as well as <msqrt>, to ensure firstChild() will have a box
-    // to measure and store a glyph-based height for preferredLogicalHeightAfterSizing.
-    if (!firstChild())
-        RenderMathMLBlock::addChild(RenderMathMLRow::createAnonymousWithParentRenderer(this));
-    
-    // An <mroot>'s index has { position: absolute }.
-    if (newChild->style()->position() == AbsolutePosition)
-        RenderMathMLBlock::addChild(newChild);
-    else
-        firstChild()->addChild(newChild, beforeChild && beforeChild->parent() == firstChild() ? beforeChild : 0);
-}
-
-RenderBoxModelObject* RenderMathMLRoot::index() const
-{
-    if (!firstChild())
-        return 0;
-    RenderObject* index = firstChild()->nextSibling();
-    if (!index || !index->isBoxModelObject())
-        return 0;
-    return toRenderBoxModelObject(index);
-}
-
-void RenderMathMLRoot::computePreferredLogicalWidths()
-{
-    ASSERT(preferredLogicalWidthsDirty() && needsLayout());
-    
-#ifndef NDEBUG
-    // FIXME: Remove this once mathml stops modifying the render tree here.
-    SetLayoutNeededForbiddenScope layoutForbiddenScope(this, false);
-#endif
-    
-    computeChildrenPreferredLogicalHeights();
-    
-    int baseHeight = firstChild() ? roundToInt(preferredLogicalHeightAfterSizing(firstChild())) : style()->fontSize();
-    
-    int frontWidth = lroundf(gFrontWidthEms * style()->fontSize());
-    
-    // Base height above which the shape of the root changes
-    float thresholdHeight = gThresholdBaseHeightEms * style()->fontSize();
-    if (baseHeight > thresholdHeight && thresholdHeight) {
-        float shift = min<float>((baseHeight - thresholdHeight) / thresholdHeight, 1.0f);
-        m_overbarLeftPointShift = static_cast<int>(shift * gRadicalBottomPointXFront * frontWidth);
-        m_intrinsicPaddingAfter = lroundf(gBigRootBottomPaddingEms * style()->fontSize());
-    } else {
-        m_overbarLeftPointShift = 0;
-        m_intrinsicPaddingAfter = 0;
-    }
-    
-    int rootPad = lroundf(gSpaceAboveEms * style()->fontSize());
-    m_intrinsicPaddingBefore = rootPad;
-    m_indexTop = 0;
-    if (RenderBoxModelObject* index = this->index()) {
-        m_intrinsicPaddingStart = roundToInt(index->maxPreferredLogicalWidth()) + m_overbarLeftPointShift;
-        
-        int indexHeight = roundToInt(preferredLogicalHeightAfterSizing(index));
-        int partDipHeight = lroundf((1 - gRootRadicalDipLeftPointYPos) * baseHeight);
-        int rootExtraTop = partDipHeight + indexHeight - (baseHeight + rootPad);
-        if (rootExtraTop > 0)
-            m_intrinsicPaddingBefore += rootExtraTop;
-        else
-            m_indexTop = - rootExtraTop;
-    } else
-        m_intrinsicPaddingStart = frontWidth;
-
-    RenderMathMLBlock::computePreferredLogicalWidths();
-    
-    // Shrink our logical width to its probable value now without triggering unnecessary relayout of our children.
-    ASSERT(needsLayout() && logicalWidth() >= maxPreferredLogicalWidth());
-    setLogicalWidth(maxPreferredLogicalWidth());
-}
-
-void RenderMathMLRoot::layout()
-{
-    // Our computePreferredLogicalWidths() may change our logical width and then layout our children, which
-    // RenderBlock::layout()'s relayoutChildren logic isn't expecting.
-    if (preferredLogicalWidthsDirty())
-        computePreferredLogicalWidths();
-    
-    RenderMathMLBlock::layout();
-    
-    RenderBoxModelObject* index = this->index();
-    // If |index|, it should be a RenderBlock here, unless the user has overriden its { position: absolute }.
-    if (index && index->isBox())
-        toRenderBox(index)->setLogicalTop(m_indexTop);
-}
-
-void RenderMathMLRoot::paint(PaintInfo& info, const LayoutPoint& paintOffset)
-{
-    RenderMathMLBlock::paint(info, paintOffset);
-    
-    if (info.context->paintingDisabled())
-        return;
-    
-    IntPoint adjustedPaintOffset = roundedIntPoint(paintOffset + location() + contentBoxRect().location());
-    
-    int startX = adjustedPaintOffset.x();
-    int frontWidth = lroundf(gFrontWidthEms * style()->fontSize());
-    int overbarWidth = roundToInt(contentLogicalWidth()) + m_overbarLeftPointShift;
-    
-    int baseHeight = roundToInt(contentLogicalHeight());
-    int rootPad = lroundf(gSpaceAboveEms * style()->fontSize());
-    adjustedPaintOffset.setY(adjustedPaintOffset.y() - rootPad);
-    
-    float radicalDipLeftPointYPos = (index() ? gRootRadicalDipLeftPointYPos : gSqrtRadicalDipLeftPointYPos) * baseHeight;
-    
-    FloatPoint overbarLeftPoint(startX - m_overbarLeftPointShift, adjustedPaintOffset.y());
-    FloatPoint bottomPoint(startX - gRadicalBottomPointXFront * frontWidth, adjustedPaintOffset.y() + baseHeight + gRadicalBottomPointLower);
-    FloatPoint dipLeftPoint(startX - gRadicalDipLeftPointXFront * frontWidth, adjustedPaintOffset.y() + radicalDipLeftPointYPos);
-    FloatPoint leftEnd(startX - frontWidth, dipLeftPoint.y() + gRadicalLeftEndYShiftEms * style()->fontSize());
-    
-    GraphicsContextStateSaver stateSaver(*info.context);
-    
-    info.context->setStrokeThickness(gRadicalLineThicknessEms * style()->fontSize());
-    info.context->setStrokeStyle(SolidStroke);
-    info.context->setStrokeColor(style()->visitedDependentColor(CSSPropertyColor), ColorSpaceDeviceRGB);
-    info.context->setLineJoin(MiterJoin);
-    info.context->setMiterLimit(style()->fontSize());
-    
-    Path root;
-    
-    root.moveTo(FloatPoint(overbarLeftPoint.x() + overbarWidth, adjustedPaintOffset.y()));
-    // draw top
-    root.addLineTo(overbarLeftPoint);
-    // draw from top left corner to bottom point of radical
-    root.addLineTo(bottomPoint);
-    // draw from bottom point to top of left part of radical base "dip"
-    root.addLineTo(dipLeftPoint);
-    // draw to end
-    root.addLineTo(leftEnd);
-    
-    info.context->strokePath(root);
-    
-    GraphicsContextStateSaver maskStateSaver(*info.context);
-    
-    // Build a mask to draw the thick part of the root.
-    Path mask;
-    
-    mask.moveTo(overbarLeftPoint);
-    mask.addLineTo(bottomPoint);
-    mask.addLineTo(dipLeftPoint);
-    mask.addLineTo(FloatPoint(2 * dipLeftPoint.x() - leftEnd.x(), 2 * dipLeftPoint.y() - leftEnd.y()));
-    
-    info.context->clip(mask);
-    
-    // Draw the thick part of the root.
-    info.context->setStrokeThickness(gRadicalThickLineThicknessEms * style()->fontSize());
-    info.context->setLineCap(SquareCap);
-    
-    Path line;
-    line.moveTo(bottomPoint);
-    line.addLineTo(dipLeftPoint);
-    
-    info.context->strokePath(line);
-}
-
-}
-
-#endif // ENABLE(MATHML)