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/*
* Copyright (C) 2009 Alex Milowski (alex@milowski.com). All rights reserved.
* Copyright (C) 2012 David Barton (dbarton@mathscribe.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 "RenderMathMLBlock.h"
#include "GraphicsContext.h"
#include "MathMLNames.h"
#if ENABLE(DEBUG_MATH_LAYOUT)
#include "PaintInfo.h"
#endif
namespace WebCore {
using namespace MathMLNames;
RenderMathMLBlock::RenderMathMLBlock(Node* container)
: RenderBlock(container)
, m_intrinsicPaddingBefore(0)
, m_intrinsicPaddingAfter(0)
, m_intrinsicPaddingStart(0)
, m_intrinsicPaddingEnd(0)
, m_preferredLogicalHeight(preferredLogicalHeightUnset)
{
}
bool RenderMathMLBlock::isChildAllowed(RenderObject* child, RenderStyle*) const
{
return child->node() && child->node()->nodeType() == Node::ELEMENT_NODE;
}
LayoutUnit RenderMathMLBlock::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 RenderMathMLBlock::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 RenderMathMLBlock::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 RenderMathMLBlock::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 RenderMathMLBlock::paddingBefore() const
{
return computedCSSPaddingBefore() + m_intrinsicPaddingBefore;
}
LayoutUnit RenderMathMLBlock::paddingAfter() const
{
return computedCSSPaddingAfter() + m_intrinsicPaddingAfter;
}
LayoutUnit RenderMathMLBlock::paddingStart() const
{
return computedCSSPaddingStart() + m_intrinsicPaddingStart;
}
LayoutUnit RenderMathMLBlock::paddingEnd() const
{
return computedCSSPaddingEnd() + m_intrinsicPaddingEnd;
}
void RenderMathMLBlock::computePreferredLogicalWidths()
{
ASSERT(preferredLogicalWidthsDirty());
m_preferredLogicalHeight = preferredLogicalHeightUnset;
RenderBlock::computePreferredLogicalWidths();
}
RenderMathMLBlock* RenderMathMLBlock::createAnonymousMathMLBlock(EDisplay display)
{
RefPtr<RenderStyle> newStyle = RenderStyle::createAnonymousStyleWithDisplay(style(), display);
RenderMathMLBlock* newBlock = new (renderArena()) RenderMathMLBlock(document() /* is anonymous */);
newBlock->setStyle(newStyle.release());
return newBlock;
}
// An arbitrary large value, like RenderBlock.cpp BLOCK_MAX_WIDTH or FixedTableLayout.cpp TABLE_MAX_WIDTH.
static const int cLargeLogicalWidth = 15000;
void RenderMathMLBlock::computeChildrenPreferredLogicalHeights()
{
ASSERT(needsLayout());
// Ensure a full repaint will happen after layout finishes.
setNeedsLayout(true, MarkOnlyThis);
LayoutUnit oldAvailableLogicalWidth = availableLogicalWidth();
setLogicalWidth(cLargeLogicalWidth);
for (RenderObject* child = firstChild(); child; child = child->nextSibling()) {
if (!child->isBox())
continue;
// Because our width changed, |child| may need layout.
if (child->maxPreferredLogicalWidth() > oldAvailableLogicalWidth)
child->setNeedsLayout(true, MarkOnlyThis);
RenderMathMLBlock* childMathMLBlock = child->isRenderMathMLBlock() ? toRenderMathMLBlock(child) : 0;
if (childMathMLBlock && !childMathMLBlock->isPreferredLogicalHeightDirty())
continue;
// Layout our child to compute its preferred logical height.
child->layoutIfNeeded();
if (childMathMLBlock)
childMathMLBlock->setPreferredLogicalHeight(childMathMLBlock->logicalHeight());
}
}
LayoutUnit RenderMathMLBlock::preferredLogicalHeightAfterSizing(RenderObject* child)
{
if (child->isRenderMathMLBlock())
return toRenderMathMLBlock(child)->preferredLogicalHeight();
if (child->isBox()) {
ASSERT(!child->needsLayout());
return toRenderBox(child)->logicalHeight();
}
return child->style()->fontSize();
}
const char* RenderMathMLBlock::renderName() const
{
EDisplay display = style()->display();
if (display == BLOCK)
return isAnonymous() ? "RenderMathMLBlock (anonymous, block)" : "RenderMathMLBlock (block)";
if (display == INLINE_BLOCK)
return isAnonymous() ? "RenderMathMLBlock (anonymous, inline-block)" : "RenderMathMLBlock (inline-block)";
// |display| should be one of the above.
ASSERT_NOT_REACHED();
return isAnonymous() ? "RenderMathMLBlock (anonymous)" : "RenderMathMLBlock";
}
#if ENABLE(DEBUG_MATH_LAYOUT)
void RenderMathMLBlock::paint(PaintInfo& info, const LayoutPoint& paintOffset)
{
RenderBlock::paint(info, paintOffset);
if (info.context->paintingDisabled() || info.phase != PaintPhaseForeground)
return;
IntPoint adjustedPaintOffset = roundedIntPoint(paintOffset + location());
GraphicsContextStateSaver stateSaver(*info.context);
info.context->setStrokeThickness(1.0f);
info.context->setStrokeStyle(SolidStroke);
info.context->setStrokeColor(Color(0, 0, 255), ColorSpaceSRGB);
info.context->drawLine(adjustedPaintOffset, IntPoint(adjustedPaintOffset.x() + pixelSnappedOffsetWidth(), adjustedPaintOffset.y()));
info.context->drawLine(IntPoint(adjustedPaintOffset.x() + pixelSnappedOffsetWidth(), adjustedPaintOffset.y()), IntPoint(adjustedPaintOffset.x() + pixelSnappedOffsetWidth(), adjustedPaintOffset.y() + pixelSnappedOffsetHeight()));
info.context->drawLine(IntPoint(adjustedPaintOffset.x(), adjustedPaintOffset.y() + pixelSnappedOffsetHeight()), IntPoint(adjustedPaintOffset.x() + pixelSnappedOffsetWidth(), adjustedPaintOffset.y() + pixelSnappedOffsetHeight()));
info.context->drawLine(adjustedPaintOffset, IntPoint(adjustedPaintOffset.x(), adjustedPaintOffset.y() + pixelSnappedOffsetHeight()));
int topStart = paddingTop();
info.context->setStrokeColor(Color(0, 255, 0), ColorSpaceSRGB);
info.context->drawLine(IntPoint(adjustedPaintOffset.x(), adjustedPaintOffset.y() + topStart), IntPoint(adjustedPaintOffset.x() + pixelSnappedOffsetWidth(), adjustedPaintOffset.y() + topStart));
int baseline = roundToInt(baselinePosition(AlphabeticBaseline, true, HorizontalLine));
info.context->setStrokeColor(Color(255, 0, 0), ColorSpaceSRGB);
info.context->drawLine(IntPoint(adjustedPaintOffset.x(), adjustedPaintOffset.y() + baseline), IntPoint(adjustedPaintOffset.x() + pixelSnappedOffsetWidth(), adjustedPaintOffset.y() + baseline));
}
#endif // ENABLE(DEBUG_MATH_LAYOUT)
}
#endif
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